opendaylight/md-sal/sal-akka-raft/src/test/java/org/opendaylight/controller/cluster/raft/RaftActorServerConfigurationSupportTest.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.raft;
   9
  10 import static org.junit.Assert.assertEquals;
  11 import static org.junit.Assert.assertTrue;
  12 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.assertNoneMatching;
  13 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.clearMessages;
  14 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.expectFirstMatching;
  15 import static org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor.expectMatching;
  16 import akka.actor.ActorRef;
  17 import akka.actor.Props;
  18 import akka.actor.UntypedActor;
  19 import akka.dispatch.Dispatchers;
  20 import akka.testkit.JavaTestKit;
  21 import akka.testkit.TestActorRef;
  22 import com.google.common.base.Optional;
  23 import com.google.common.collect.ImmutableMap;
  24 import com.google.common.collect.Maps;
  25 import com.google.common.collect.Sets;
  26 import java.util.Collections;
  27 import java.util.List;
  28 import java.util.Map;
  29 import java.util.concurrent.TimeUnit;
  30 import org.junit.After;
  31 import org.junit.Before;
  32 import org.junit.Test;
  33 import org.opendaylight.controller.cluster.DataPersistenceProvider;
  34 import org.opendaylight.controller.cluster.NonPersistentDataProvider;
  35 import org.opendaylight.controller.cluster.raft.ServerConfigurationPayload.ServerInfo;
  36 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
  37 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
  38 import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
  39 import org.opendaylight.controller.cluster.raft.base.messages.InitiateCaptureSnapshot;
  40 import org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader;
  41 import org.opendaylight.controller.cluster.raft.behaviors.Follower;
  42 import org.opendaylight.controller.cluster.raft.behaviors.Leader;
  43 import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
  44 import org.opendaylight.controller.cluster.raft.messages.AddServer;
  45 import org.opendaylight.controller.cluster.raft.messages.AddServerReply;
  46 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  47 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  48 import org.opendaylight.controller.cluster.raft.messages.RemoveServer;
  49 import org.opendaylight.controller.cluster.raft.messages.RemoveServerReply;
  50 import org.opendaylight.controller.cluster.raft.messages.ServerChangeStatus;
  51 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
  52 import org.opendaylight.controller.cluster.raft.messages.UnInitializedFollowerSnapshotReply;
  53 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
  54 import org.opendaylight.controller.cluster.raft.utils.ForwardMessageToBehaviorActor;
  55 import org.opendaylight.controller.cluster.raft.utils.InMemoryJournal;
  56 import org.opendaylight.controller.cluster.raft.utils.InMemorySnapshotStore;
  57 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
  58 import org.slf4j.Logger;
  59 import org.slf4j.LoggerFactory;
  60 import scala.concurrent.duration.FiniteDuration;
  61
  62 /**
  63  * Unit tests for RaftActorServerConfigurationSupport.
  64  *
  65  * @author Thomas Pantelis
  66  */
  67 public class RaftActorServerConfigurationSupportTest extends AbstractActorTest {
  68     static final String LEADER_ID = "leader";
  69     static final String FOLLOWER_ID = "follower";
  70     static final String NEW_SERVER_ID = "new-server";
  71     static final String NEW_SERVER_ID2 = "new-server2";
  72     private static final Logger LOG = LoggerFactory.getLogger(RaftActorServerConfigurationSupportTest.class);
  73     private static final DataPersistenceProvider NO_PERSISTENCE = new NonPersistentDataProvider();
  74
  75     private final TestActorFactory actorFactory = new TestActorFactory(getSystem());
  76
  77     private final TestActorRef<ForwardMessageToBehaviorActor> followerActor = actorFactory.createTestActor(
  78             Props.create(ForwardMessageToBehaviorActor.class).withDispatcher(Dispatchers.DefaultDispatcherId()),
  79             actorFactory.generateActorId(FOLLOWER_ID));
  80
  81     private TestActorRef<MockNewFollowerRaftActor> newFollowerRaftActor;
  82     private TestActorRef<MessageCollectorActor> newFollowerCollectorActor;
  83     private RaftActorContext newFollowerActorContext;
  84
  85     private final JavaTestKit testKit = new JavaTestKit(getSystem());
  86
  87     @Before
  88     public void setup() {
  89         InMemoryJournal.clear();
  90         InMemorySnapshotStore.clear();
  91
  92         DefaultConfigParamsImpl configParams = newFollowerConfigParams();
  93
  94         newFollowerCollectorActor = actorFactory.createTestActor(
  95                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
  96                 actorFactory.generateActorId(NEW_SERVER_ID + "Collector"));
  97         newFollowerRaftActor = actorFactory.createTestActor(MockNewFollowerRaftActor.props(
  98                 configParams, newFollowerCollectorActor).withDispatcher(Dispatchers.DefaultDispatcherId()),
  99                 actorFactory.generateActorId(NEW_SERVER_ID));
 100
 101         try {
 102             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 103         } catch (Exception e) {
 104             newFollowerActorContext = newFollowerRaftActor.underlyingActor().getRaftActorContext();
 105         }
 106     }
 107
 108     private static DefaultConfigParamsImpl newFollowerConfigParams() {
 109         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 110         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
 111         configParams.setElectionTimeoutFactor(100000);
 112         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 113         return configParams;
 114     }
 115
 116     @After
 117     public void tearDown() throws Exception {
 118         actorFactory.close();
 119     }
 120
 121     @Test
 122     public void testAddServerWithExistingFollower() throws Exception {
 123         RaftActorContext followerActorContext = newFollowerContext(FOLLOWER_ID, followerActor);
 124         followerActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 125                 0, 3, 1).build());
 126         followerActorContext.setCommitIndex(2);
 127         followerActorContext.setLastApplied(2);
 128
 129         Follower follower = new Follower(followerActorContext);
 130         followerActor.underlyingActor().setBehavior(follower);
 131
 132         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 133                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 134                         followerActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 135                 actorFactory.generateActorId(LEADER_ID));
 136
 137         // Expect initial heartbeat from the leader.
 138         expectFirstMatching(followerActor, AppendEntries.class);
 139         clearMessages(followerActor);
 140
 141         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 142         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 143
 144         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 145
 146         // Leader should install snapshot - capture and verify ApplySnapshot contents
 147
 148         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 149         @SuppressWarnings("unchecked")
 150         List<Object> snapshotState = (List<Object>) MockRaftActor.toObject(applySnapshot.getSnapshot().getState());
 151         assertEquals("Snapshot state", snapshotState, leaderRaftActor.getState());
 152
 153         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 154         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 155         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 156
 157         // Verify ServerConfigurationPayload entry in leader's log
 158
 159         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 160         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 161         assertEquals("Leader journal last index", 3, leaderActorContext.getReplicatedLog().lastIndex());
 162         assertEquals("Leader commit index", 3, leaderActorContext.getCommitIndex());
 163         assertEquals("Leader last applied index", 3, leaderActorContext.getLastApplied());
 164         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 165                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 166
 167         // Verify ServerConfigurationPayload entry in both followers
 168
 169         expectFirstMatching(followerActor, ApplyState.class);
 170         assertEquals("Follower journal last index", 3, followerActorContext.getReplicatedLog().lastIndex());
 171         verifyServerConfigurationPayloadEntry(followerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 172                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 173
 174         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 175         assertEquals("New follower journal last index", 3, newFollowerActorContext.getReplicatedLog().lastIndex());
 176         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 177                 votingServer(FOLLOWER_ID), votingServer(NEW_SERVER_ID));
 178
 179         // Verify new server config was applied in both followers
 180
 181         assertEquals("Follower peers", Sets.newHashSet(LEADER_ID, NEW_SERVER_ID), followerActorContext.getPeerIds());
 182
 183         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID, FOLLOWER_ID), newFollowerActorContext.getPeerIds());
 184
 185         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 186         expectFirstMatching(followerActor, ApplyState.class);
 187
 188         assertEquals("Follower commit index", 3, followerActorContext.getCommitIndex());
 189         assertEquals("Follower last applied index", 3, followerActorContext.getLastApplied());
 190         assertEquals("New follower commit index", 3, newFollowerActorContext.getCommitIndex());
 191         assertEquals("New follower last applied index", 3, newFollowerActorContext.getLastApplied());
 192
 193         List<ReplicatedLogImplEntry> persistedLogEntries = InMemoryJournal.get(LEADER_ID, ReplicatedLogImplEntry.class);
 194         assertEquals("Leader ReplicatedLogImplEntry entries", 1, persistedLogEntries.size());
 195         ReplicatedLogImplEntry logEntry = persistedLogEntries.get(0);
 196         assertEquals("Leader ReplicatedLogImplEntry getTerm", 1, logEntry.getTerm());
 197         assertEquals("Leader ReplicatedLogImplEntry getIndex", 3, logEntry.getIndex());
 198         assertEquals("Leader ReplicatedLogImplEntry getData", ServerConfigurationPayload.class, logEntry.getData().getClass());
 199
 200         persistedLogEntries = InMemoryJournal.get(NEW_SERVER_ID, ReplicatedLogImplEntry.class);
 201         assertEquals("New follower ReplicatedLogImplEntry entries", 1, persistedLogEntries.size());
 202         logEntry = persistedLogEntries.get(0);
 203         assertEquals("New follower ReplicatedLogImplEntry getTerm", 1, logEntry.getTerm());
 204         assertEquals("New follower ReplicatedLogImplEntry getIndex", 3, logEntry.getIndex());
 205         assertEquals("New follower ReplicatedLogImplEntry getData", ServerConfigurationPayload.class,
 206                 logEntry.getData().getClass());
 207     }
 208
 209     @Test
 210     public void testAddServerWithNoExistingFollower() throws Exception {
 211         RaftActorContext initialActorContext = new MockRaftActorContext();
 212         initialActorContext.setCommitIndex(1);
 213         initialActorContext.setLastApplied(1);
 214         initialActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(
 215                 0, 2, 1).build());
 216
 217         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 218                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 219                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 220                 actorFactory.generateActorId(LEADER_ID));
 221
 222         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 223         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 224
 225         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 226
 227         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 228
 229         // Leader should install snapshot - capture and verify ApplySnapshot contents
 230
 231         ApplySnapshot applySnapshot = expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 232         @SuppressWarnings("unchecked")
 233         List<Object> snapshotState = (List<Object>) MockRaftActor.toObject(applySnapshot.getSnapshot().getState());
 234         assertEquals("Snapshot state", snapshotState, leaderRaftActor.getState());
 235
 236         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 237         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 238         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 239
 240         // Verify ServerConfigurationPayload entry in leader's log
 241
 242         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 243         assertEquals("Leader journal last index", 2, leaderActorContext.getReplicatedLog().lastIndex());
 244         assertEquals("Leader commit index", 2, leaderActorContext.getCommitIndex());
 245         assertEquals("Leader last applied index", 2, leaderActorContext.getLastApplied());
 246         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 247                 votingServer(NEW_SERVER_ID));
 248
 249         // Verify ServerConfigurationPayload entry in the new follower
 250
 251         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 252         assertEquals("New follower journal last index", 2, newFollowerActorContext.getReplicatedLog().lastIndex());
 253         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 254                 votingServer(NEW_SERVER_ID));
 255
 256         // Verify new server config was applied in the new follower
 257
 258         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID), newFollowerActorContext.getPeerIds());
 259     }
 260
 261     @Test
 262     public void testAddServersAsNonVoting() throws Exception {
 263         RaftActorContext initialActorContext = new MockRaftActorContext();
 264
 265         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 266                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 267                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 268                 actorFactory.generateActorId(LEADER_ID));
 269
 270         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 271         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 272
 273         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 274
 275         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), false), testKit.getRef());
 276
 277         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 278         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 279         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 280
 281         // Verify ServerConfigurationPayload entry in leader's log
 282
 283         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 284
 285         assertEquals("Leader journal last index", 0, leaderActorContext.getReplicatedLog().lastIndex());
 286         assertEquals("Leader commit index", 0, leaderActorContext.getCommitIndex());
 287         assertEquals("Leader last applied index", 0, leaderActorContext.getLastApplied());
 288         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 289                 nonVotingServer(NEW_SERVER_ID));
 290
 291         // Verify ServerConfigurationPayload entry in the new follower
 292
 293         expectFirstMatching(newFollowerCollectorActor, ApplyState.class);
 294         assertEquals("New follower journal last index", 0, newFollowerActorContext.getReplicatedLog().lastIndex());
 295         verifyServerConfigurationPayloadEntry(newFollowerActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 296                 nonVotingServer(NEW_SERVER_ID));
 297
 298         // Verify new server config was applied in the new follower
 299
 300         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID), newFollowerActorContext.getPeerIds());
 301
 302         assertNoneMatching(newFollowerCollectorActor, InstallSnapshot.class, 500);
 303
 304         // Add another non-voting server.
 305
 306         clearMessages(leaderCollectorActor);
 307
 308         RaftActorContext follower2ActorContext = newFollowerContext(NEW_SERVER_ID2, followerActor);
 309         Follower newFollower2 = new Follower(follower2ActorContext);
 310         followerActor.underlyingActor().setBehavior(newFollower2);
 311
 312         leaderActor.tell(new AddServer(NEW_SERVER_ID2, followerActor.path().toString(), false), testKit.getRef());
 313
 314         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 315         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 316         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 317
 318         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 319         assertEquals("Leader journal last index", 1, leaderActorContext.getReplicatedLog().lastIndex());
 320         assertEquals("Leader commit index", 1, leaderActorContext.getCommitIndex());
 321         assertEquals("Leader last applied index", 1, leaderActorContext.getLastApplied());
 322         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(),
 323                 votingServer(LEADER_ID), nonVotingServer(NEW_SERVER_ID), nonVotingServer(NEW_SERVER_ID2));
 324     }
 325
 326     @Test
 327     public void testAddServerWithOperationInProgress() throws Exception {
 328         RaftActorContext initialActorContext = new MockRaftActorContext();
 329
 330         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 331                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 332                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 333                 actorFactory.generateActorId(LEADER_ID));
 334
 335         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 336         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 337
 338         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 339
 340         RaftActorContext follower2ActorContext = newFollowerContext(NEW_SERVER_ID2, followerActor);
 341         Follower newFollower2 = new Follower(follower2ActorContext);
 342         followerActor.underlyingActor().setBehavior(newFollower2);
 343
 344         MockNewFollowerRaftActor newFollowerRaftActorInstance = newFollowerRaftActor.underlyingActor();
 345         newFollowerRaftActorInstance.setDropMessageOfType(InstallSnapshot.SERIALIZABLE_CLASS);
 346
 347         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 348
 349         // Wait for leader's install snapshot and capture it
 350
 351         InstallSnapshot installSnapshot = expectFirstMatching(newFollowerCollectorActor, InstallSnapshot.class);
 352
 353         // Send a second AddServer - should get queued
 354         JavaTestKit testKit2 = new JavaTestKit(getSystem());
 355         leaderActor.tell(new AddServer(NEW_SERVER_ID2, followerActor.path().toString(), false), testKit2.getRef());
 356
 357         // Continue the first AddServer
 358         newFollowerRaftActorInstance.setDropMessageOfType(null);
 359         newFollowerRaftActor.tell(installSnapshot, leaderActor);
 360
 361         // Verify both complete successfully
 362         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 363         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 364
 365         addServerReply = testKit2.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 366         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 367
 368         // Verify ServerConfigurationPayload entries in leader's log
 369
 370         expectMatching(leaderCollectorActor, ApplyState.class, 2);
 371         assertEquals("Leader journal last index", 1, leaderActorContext.getReplicatedLog().lastIndex());
 372         assertEquals("Leader commit index", 1, leaderActorContext.getCommitIndex());
 373         assertEquals("Leader last applied index", 1, leaderActorContext.getLastApplied());
 374         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(),
 375                 votingServer(LEADER_ID), votingServer(NEW_SERVER_ID), nonVotingServer(NEW_SERVER_ID2));
 376
 377         // Verify ServerConfigurationPayload entry in the new follower
 378
 379         expectMatching(newFollowerCollectorActor, ApplyState.class, 2);
 380         assertEquals("New follower peers", Sets.newHashSet(LEADER_ID, NEW_SERVER_ID2),
 381                newFollowerActorContext.getPeerIds());
 382     }
 383
 384     @Test
 385     public void testAddServerWithPriorSnapshotInProgress() throws Exception {
 386         RaftActorContext initialActorContext = new MockRaftActorContext();
 387
 388         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 389                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 390                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 391                 actorFactory.generateActorId(LEADER_ID));
 392
 393         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 394         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 395
 396         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 397
 398         // Drop commit message for now to delay snapshot completion
 399         leaderRaftActor.setDropMessageOfType(String.class);
 400
 401         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 402
 403         String commitMsg = expectFirstMatching(leaderCollectorActor, String.class);
 404
 405         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 406
 407         leaderRaftActor.setDropMessageOfType(null);
 408         leaderActor.tell(commitMsg, leaderActor);
 409
 410         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 411         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 412         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 413
 414         expectFirstMatching(newFollowerCollectorActor, ApplySnapshot.class);
 415
 416         // Verify ServerConfigurationPayload entry in leader's log
 417
 418         expectFirstMatching(leaderCollectorActor, ApplyState.class);
 419         assertEquals("Leader journal last index", 0, leaderActorContext.getReplicatedLog().lastIndex());
 420         assertEquals("Leader commit index", 0, leaderActorContext.getCommitIndex());
 421         assertEquals("Leader last applied index", 0, leaderActorContext.getLastApplied());
 422         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 423                 votingServer(NEW_SERVER_ID));
 424     }
 425
 426     @Test
 427     public void testAddServerWithPriorSnapshotCompleteTimeout() throws Exception {
 428         RaftActorContext initialActorContext = new MockRaftActorContext();
 429
 430         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 431                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 432                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 433                 actorFactory.generateActorId(LEADER_ID));
 434
 435         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 436         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 437
 438         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(1);
 439
 440         // Drop commit message so the snapshot doesn't complete.
 441         leaderRaftActor.setDropMessageOfType(String.class);
 442
 443         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 444
 445         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 446
 447         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 448         assertEquals("getStatus", ServerChangeStatus.TIMEOUT, addServerReply.getStatus());
 449
 450         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 451     }
 452
 453     @Test
 454     public void testAddServerWithLeaderChangeBeforePriorSnapshotComplete() throws Exception {
 455         RaftActorContext initialActorContext = new MockRaftActorContext();
 456
 457         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 458                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 459                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 460                 actorFactory.generateActorId(LEADER_ID));
 461
 462         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 463         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 464         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(100);
 465
 466         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 467
 468         // Drop the commit message so the snapshot doesn't complete yet.
 469         leaderRaftActor.setDropMessageOfType(String.class);
 470
 471         leaderActor.tell(new InitiateCaptureSnapshot(), leaderActor);
 472
 473         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 474
 475         String commitMsg = expectFirstMatching(leaderCollectorActor, String.class);
 476
 477         // Change the leader behavior to follower
 478         leaderActor.tell(new Follower(leaderActorContext), leaderActor);
 479
 480         // Drop CaptureSnapshotReply in case install snapshot is incorrectly initiated after the prior
 481         // snapshot completes. This will prevent the invalid snapshot from completing and fail the
 482         // isCapturing assertion below.
 483         leaderRaftActor.setDropMessageOfType(CaptureSnapshotReply.class);
 484
 485         // Complete the prior snapshot - this should be a no-op b/c it's no longer the leader
 486         leaderActor.tell(commitMsg, leaderActor);
 487
 488         leaderActor.tell(new RaftActorServerConfigurationSupport.ServerOperationTimeout(NEW_SERVER_ID), leaderActor);
 489
 490         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 491         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 492
 493         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 494         assertEquals("isCapturing", false, leaderActorContext.getSnapshotManager().isCapturing());
 495     }
 496
 497     @Test
 498     public void testAddServerWithLeaderChangeDuringInstallSnapshot() throws Exception {
 499         RaftActorContext initialActorContext = new MockRaftActorContext();
 500
 501         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 502                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 503                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 504                 actorFactory.generateActorId(LEADER_ID));
 505
 506         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 507         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 508
 509         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(8);
 510
 511         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 512
 513         // Drop the UnInitializedFollowerSnapshotReply to delay it.
 514         leaderRaftActor.setDropMessageOfType(UnInitializedFollowerSnapshotReply.class);
 515
 516         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 517
 518         UnInitializedFollowerSnapshotReply snapshotReply = expectFirstMatching(leaderCollectorActor,
 519                 UnInitializedFollowerSnapshotReply.class);
 520
 521         // Prevent election timeout when the leader switches to follower
 522         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(100);
 523
 524         // Change the leader behavior to follower
 525         leaderActor.tell(new Follower(leaderActorContext), leaderActor);
 526
 527         // Send the captured UnInitializedFollowerSnapshotReply - should be a no-op
 528         leaderRaftActor.setDropMessageOfType(null);
 529         leaderActor.tell(snapshotReply, leaderActor);
 530
 531         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 532         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 533
 534         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 535     }
 536
 537     @Test
 538     public void testAddServerWithInstallSnapshotTimeout() throws Exception {
 539         RaftActorContext initialActorContext = new MockRaftActorContext();
 540
 541         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 542                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 543                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 544                 actorFactory.generateActorId(LEADER_ID));
 545
 546         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 547         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 548         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(1);
 549
 550         // Drop the InstallSnapshot message so it times out
 551         newFollowerRaftActor.underlyingActor().setDropMessageOfType(InstallSnapshot.SERIALIZABLE_CLASS);
 552
 553         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 554
 555         leaderActor.tell(new UnInitializedFollowerSnapshotReply("bogus"), leaderActor);
 556
 557         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 558         assertEquals("getStatus", ServerChangeStatus.TIMEOUT, addServerReply.getStatus());
 559
 560         assertEquals("Leader peers size", 0, leaderActorContext.getPeerIds().size());
 561         assertEquals("Leader followers size", 0,
 562                 ((AbstractLeader)leaderRaftActor.getCurrentBehavior()).getFollowerIds().size());
 563     }
 564
 565     @Test
 566     public void testAddServerWithNoLeader() {
 567         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 568         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 569
 570         TestActorRef<MockRaftActor> noLeaderActor = actorFactory.createTestActor(
 571                 MockRaftActor.props(LEADER_ID, ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 572                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 573                 actorFactory.generateActorId(LEADER_ID));
 574         noLeaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 575
 576         noLeaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 577         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 578         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, addServerReply.getStatus());
 579     }
 580
 581     @Test
 582     public void testAddServerWithNoConsensusReached() {
 583         RaftActorContext initialActorContext = new MockRaftActorContext();
 584
 585         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 586                 MockLeaderRaftActor.props(ImmutableMap.<String, String>of(),
 587                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 588                 actorFactory.generateActorId(LEADER_ID));
 589
 590         MockLeaderRaftActor leaderRaftActor = leaderActor.underlyingActor();
 591         RaftActorContext leaderActorContext = leaderRaftActor.getRaftActorContext();
 592
 593         TestActorRef<MessageCollectorActor> leaderCollectorActor = newLeaderCollectorActor(leaderRaftActor);
 594
 595         // Drop UnInitializedFollowerSnapshotReply initially
 596         leaderRaftActor.setDropMessageOfType(UnInitializedFollowerSnapshotReply.class);
 597
 598         MockNewFollowerRaftActor newFollowerRaftActorInstance = newFollowerRaftActor.underlyingActor();
 599         TestActorRef<MessageCollectorActor> newFollowerCollectorActor =
 600                 newCollectorActor(newFollowerRaftActorInstance, NEW_SERVER_ID);
 601
 602         // Drop AppendEntries to the new follower so consensus isn't reached
 603         newFollowerRaftActorInstance.setDropMessageOfType(AppendEntries.class);
 604
 605         leaderActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 606
 607         // Capture the UnInitializedFollowerSnapshotReply
 608         Object snapshotReply = expectFirstMatching(leaderCollectorActor, UnInitializedFollowerSnapshotReply.class);
 609
 610         // Send the UnInitializedFollowerSnapshotReply to resume the first request
 611         leaderRaftActor.setDropMessageOfType(null);
 612         leaderActor.tell(snapshotReply, leaderActor);
 613
 614         expectFirstMatching(newFollowerCollectorActor, AppendEntries.class);
 615
 616         // Send a second AddServer
 617         leaderActor.tell(new AddServer(NEW_SERVER_ID2, "", false), testKit.getRef());
 618
 619         // The first AddServer should succeed with OK even though consensus wasn't reached
 620         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 621         assertEquals("getStatus", ServerChangeStatus.OK, addServerReply.getStatus());
 622         assertEquals("getLeaderHint", LEADER_ID, addServerReply.getLeaderHint());
 623
 624         // Verify ServerConfigurationPayload entry in leader's log
 625         verifyServerConfigurationPayloadEntry(leaderActorContext.getReplicatedLog(), votingServer(LEADER_ID),
 626                 votingServer(NEW_SERVER_ID));
 627
 628         // The second AddServer should fail since consensus wasn't reached for the first
 629         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 630         assertEquals("getStatus", ServerChangeStatus.PRIOR_REQUEST_CONSENSUS_TIMEOUT, addServerReply.getStatus());
 631
 632         // Re-send the second AddServer - should also fail
 633         leaderActor.tell(new AddServer(NEW_SERVER_ID2, "", false), testKit.getRef());
 634         addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 635         assertEquals("getStatus", ServerChangeStatus.PRIOR_REQUEST_CONSENSUS_TIMEOUT, addServerReply.getStatus());
 636     }
 637
 638     @Test
 639     public void testAddServerWithExistingServer() {
 640         RaftActorContext initialActorContext = new MockRaftActorContext();
 641
 642         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 643                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 644                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 645                 actorFactory.generateActorId(LEADER_ID));
 646
 647         leaderActor.tell(new AddServer(FOLLOWER_ID, followerActor.path().toString(), true), testKit.getRef());
 648
 649         AddServerReply addServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), AddServerReply.class);
 650         assertEquals("getStatus", ServerChangeStatus.ALREADY_EXISTS, addServerReply.getStatus());
 651     }
 652
 653     @Test
 654     public void testAddServerForwardedToLeader() {
 655         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 656         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 657
 658         TestActorRef<MessageCollectorActor> leaderActor = actorFactory.createTestActor(
 659                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 660                 actorFactory.generateActorId(LEADER_ID));
 661
 662         TestActorRef<MockRaftActor> followerRaftActor = actorFactory.createTestActor(
 663                 MockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 664                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 665                 actorFactory.generateActorId(FOLLOWER_ID));
 666         followerRaftActor.underlyingActor().waitForInitializeBehaviorComplete();
 667
 668         followerRaftActor.tell(new AppendEntries(1, LEADER_ID, 0, 1, Collections.<ReplicatedLogEntry>emptyList(),
 669                 -1, -1, (short)0), leaderActor);
 670
 671         followerRaftActor.tell(new AddServer(NEW_SERVER_ID, newFollowerRaftActor.path().toString(), true), testKit.getRef());
 672         expectFirstMatching(leaderActor, AddServer.class);
 673     }
 674
 675     @Test
 676     public void testOnApplyState() {
 677         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 678         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 679         TestActorRef<MockRaftActor> noLeaderActor = actorFactory.createTestActor(
 680                 MockRaftActor.props(LEADER_ID, ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 681                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 682                 actorFactory.generateActorId(LEADER_ID));
 683
 684         RaftActorServerConfigurationSupport support = new RaftActorServerConfigurationSupport(noLeaderActor.underlyingActor());
 685
 686         ReplicatedLogEntry serverConfigEntry = new MockRaftActorContext.MockReplicatedLogEntry(1, 1,
 687                 new ServerConfigurationPayload(Collections.<ServerInfo>emptyList()));
 688         boolean handled = support.handleMessage(new ApplyState(null, null, serverConfigEntry), ActorRef.noSender());
 689         assertEquals("Message handled", true, handled);
 690
 691         ReplicatedLogEntry nonServerConfigEntry = new MockRaftActorContext.MockReplicatedLogEntry(1, 1,
 692                 new MockRaftActorContext.MockPayload("1"));
 693         handled = support.handleMessage(new ApplyState(null, null, nonServerConfigEntry), ActorRef.noSender());
 694         assertEquals("Message handled", false, handled);
 695     }
 696
 697     @Test
 698     public void testRemoveServerWithNoLeader() {
 699         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 700         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 701
 702         TestActorRef<MockRaftActor> leaderActor = actorFactory.createTestActor(
 703                 MockRaftActor.props(LEADER_ID, ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 704                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 705                 actorFactory.generateActorId(LEADER_ID));
 706         leaderActor.underlyingActor().waitForInitializeBehaviorComplete();
 707
 708         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 709         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 710         assertEquals("getStatus", ServerChangeStatus.NO_LEADER, removeServerReply.getStatus());
 711     }
 712
 713     @Test
 714     public void testRemoveServerNonExistentServer() {
 715         RaftActorContext initialActorContext = new MockRaftActorContext();
 716
 717         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 718                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActor.path().toString()),
 719                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 720                 actorFactory.generateActorId(LEADER_ID));
 721
 722         leaderActor.tell(new RemoveServer(NEW_SERVER_ID), testKit.getRef());
 723         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 724         assertEquals("getStatus", ServerChangeStatus.DOES_NOT_EXIST, removeServerReply.getStatus());
 725     }
 726
 727     @Test
 728     public void testRemoveServerForwardToLeader() {
 729         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 730         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 731
 732         TestActorRef<MessageCollectorActor> leaderActor = actorFactory.createTestActor(
 733                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 734                 actorFactory.generateActorId(LEADER_ID));
 735
 736         TestActorRef<MockRaftActor> followerRaftActor = actorFactory.createTestActor(
 737                 MockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 738                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 739                 actorFactory.generateActorId(FOLLOWER_ID));
 740         followerRaftActor.underlyingActor().waitForInitializeBehaviorComplete();
 741
 742         followerRaftActor.tell(new AppendEntries(1, LEADER_ID, 0, 1, Collections.<ReplicatedLogEntry>emptyList(),
 743                 -1, -1, (short)0), leaderActor);
 744
 745         followerRaftActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 746         expectFirstMatching(leaderActor, RemoveServer.class);
 747     }
 748
 749     @Test
 750     public void testRemoveServer() {
 751         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 752         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 753         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 754
 755         final String followerActorId = actorFactory.generateActorId(FOLLOWER_ID);
 756         final String followerActorPath = actorFactory.createTestActorPath(followerActorId);
 757         RaftActorContext initialActorContext = new MockRaftActorContext();
 758
 759         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 760                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActorPath),
 761                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 762                 actorFactory.generateActorId(LEADER_ID));
 763
 764         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 765
 766         TestActorRef<CollectingMockRaftActor> followerRaftActor = actorFactory.createTestActor(
 767                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 768                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 769                 followerActorId);
 770
 771         TestActorRef<MessageCollectorActor> collector =
 772                 actorFactory.createTestActor(MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId("collector"));
 773
 774         followerRaftActor.underlyingActor().setCollectorActor(collector);
 775
 776         leaderActor.tell(new RemoveServer(FOLLOWER_ID), testKit.getRef());
 777         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 778         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 779
 780         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(leaderCollector, ApplyState.class);
 781         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 782         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(), votingServer(LEADER_ID));
 783
 784         RaftActorBehavior currentBehavior = leaderActor.underlyingActor().getCurrentBehavior();
 785         assertTrue("Expected Leader", currentBehavior instanceof Leader);
 786         assertEquals("Follower ids size", 0, ((Leader)currentBehavior).getFollowerIds().size());
 787
 788         MessageCollectorActor.expectFirstMatching(collector, ServerRemoved.class);
 789     }
 790
 791     @Test
 792     public void testRemoveServerLeader() {
 793         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 794         configParams.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 795         configParams.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 796
 797         final String followerActorId = actorFactory.generateActorId(FOLLOWER_ID);
 798         final String followerActorPath = actorFactory.createTestActorPath(followerActorId);
 799         RaftActorContext initialActorContext = new MockRaftActorContext();
 800
 801         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 802                 MockLeaderRaftActor.props(ImmutableMap.of(FOLLOWER_ID, followerActorPath),
 803                         initialActorContext).withDispatcher(Dispatchers.DefaultDispatcherId()),
 804                 actorFactory.generateActorId(LEADER_ID));
 805
 806         TestActorRef<MessageCollectorActor> leaderCollector = newLeaderCollectorActor(leaderActor.underlyingActor());
 807
 808         TestActorRef<CollectingMockRaftActor> followerRaftActor = actorFactory.createTestActor(
 809                 CollectingMockRaftActor.props(FOLLOWER_ID, ImmutableMap.of(LEADER_ID, leaderActor.path().toString()),
 810                         configParams, NO_PERSISTENCE).withDispatcher(Dispatchers.DefaultDispatcherId()),
 811                 followerActorId);
 812
 813         TestActorRef<MessageCollectorActor> followerCollector = actorFactory.createTestActor(MessageCollectorActor.props().
 814                 withDispatcher(Dispatchers.DefaultDispatcherId()), actorFactory.generateActorId("collector"));
 815         followerRaftActor.underlyingActor().setCollectorActor(followerCollector);
 816
 817         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 818         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 819         assertEquals("getStatus", ServerChangeStatus.OK, removeServerReply.getStatus());
 820
 821         final ApplyState applyState = MessageCollectorActor.expectFirstMatching(followerCollector, ApplyState.class);
 822         assertEquals(0L, applyState.getReplicatedLogEntry().getIndex());
 823         verifyServerConfigurationPayloadEntry(leaderActor.underlyingActor().getRaftActorContext().getReplicatedLog(),
 824                 votingServer(FOLLOWER_ID));
 825
 826         MessageCollectorActor.expectFirstMatching(leaderCollector, ServerRemoved.class);
 827     }
 828
 829     @Test
 830     public void testRemoveServerLeaderWithNoFollowers() {
 831         TestActorRef<MockLeaderRaftActor> leaderActor = actorFactory.createTestActor(
 832                 MockLeaderRaftActor.props(Collections.<String, String>emptyMap(),
 833                         new MockRaftActorContext()).withDispatcher(Dispatchers.DefaultDispatcherId()),
 834                 actorFactory.generateActorId(LEADER_ID));
 835
 836         leaderActor.tell(new RemoveServer(LEADER_ID), testKit.getRef());
 837         RemoveServerReply removeServerReply = testKit.expectMsgClass(JavaTestKit.duration("5 seconds"), RemoveServerReply.class);
 838         assertEquals("getStatus", ServerChangeStatus.NOT_SUPPORTED, removeServerReply.getStatus());
 839     }
 840
 841     private ServerInfo votingServer(String id) {
 842         return new ServerInfo(id, true);
 843     }
 844
 845     private ServerInfo nonVotingServer(String id) {
 846         return new ServerInfo(id, false);
 847     }
 848
 849     private TestActorRef<MessageCollectorActor> newLeaderCollectorActor(MockLeaderRaftActor leaderRaftActor) {
 850         return newCollectorActor(leaderRaftActor, LEADER_ID);
 851     }
 852
 853     private TestActorRef<MessageCollectorActor> newCollectorActor(AbstractMockRaftActor raftActor, String id) {
 854         TestActorRef<MessageCollectorActor> collectorActor = actorFactory.createTestActor(
 855                 MessageCollectorActor.props().withDispatcher(Dispatchers.DefaultDispatcherId()),
 856                 actorFactory.generateActorId(id + "Collector"));
 857         raftActor.setCollectorActor(collectorActor);
 858         return collectorActor;
 859     }
 860
 861     private static void verifyServerConfigurationPayloadEntry(ReplicatedLog log, ServerInfo... expected) {
 862         ReplicatedLogEntry logEntry = log.get(log.lastIndex());
 863         assertEquals("Last log entry payload class", ServerConfigurationPayload.class, logEntry.getData().getClass());
 864         ServerConfigurationPayload payload = (ServerConfigurationPayload)logEntry.getData();
 865         assertEquals("getNewServerConfig", Sets.newHashSet(expected), Sets.newHashSet(payload.getServerConfig()));
 866     }
 867
 868     private static RaftActorContext newFollowerContext(String id, TestActorRef<? extends UntypedActor> actor) {
 869         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 870         configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
 871         configParams.setElectionTimeoutFactor(100000);
 872         ElectionTermImpl termInfo = new ElectionTermImpl(NO_PERSISTENCE, id, LOG);
 873         termInfo.update(1, LEADER_ID);
 874         return new RaftActorContextImpl(actor, actor.underlyingActor().getContext(),
 875                 id, termInfo, -1, -1, ImmutableMap.of(LEADER_ID, ""), configParams, NO_PERSISTENCE, LOG);
 876     }
 877
 878     static abstract class AbstractMockRaftActor extends MockRaftActor {
 879         private volatile TestActorRef<MessageCollectorActor> collectorActor;
 880         private volatile Class<?> dropMessageOfType;
 881
 882         AbstractMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config,
 883                 DataPersistenceProvider dataPersistenceProvider, TestActorRef<MessageCollectorActor> collectorActor) {
 884             super(builder().id(id).peerAddresses(peerAddresses).config(config.get()).
 885                     dataPersistenceProvider(dataPersistenceProvider));
 886             this.collectorActor = collectorActor;
 887         }
 888
 889         void setDropMessageOfType(Class<?> dropMessageOfType) {
 890             this.dropMessageOfType = dropMessageOfType;
 891         }
 892
 893         void setCollectorActor(TestActorRef<MessageCollectorActor> collectorActor) {
 894             this.collectorActor = collectorActor;
 895         }
 896
 897         @Override
 898         public void handleCommand(Object message) {
 899             if(dropMessageOfType == null || !dropMessageOfType.equals(message.getClass())) {
 900                 super.handleCommand(message);
 901             }
 902
 903             if(collectorActor != null) {
 904                 collectorActor.tell(message, getSender());
 905             }
 906         }
 907     }
 908
 909     public static class CollectingMockRaftActor extends AbstractMockRaftActor {
 910
 911         CollectingMockRaftActor(String id, Map<String, String> peerAddresses, Optional<ConfigParams> config, DataPersistenceProvider dataPersistenceProvider, TestActorRef<MessageCollectorActor> collectorActor) {
 912             super(id, peerAddresses, config, dataPersistenceProvider, collectorActor);
 913         }
 914
 915         public static Props props(final String id, final Map<String, String> peerAddresses,
 916                                   ConfigParams config, DataPersistenceProvider dataPersistenceProvider){
 917
 918             return Props.create(CollectingMockRaftActor.class, id, peerAddresses, Optional.of(config), dataPersistenceProvider, null);
 919         }
 920
 921     }
 922
 923     public static class MockLeaderRaftActor extends AbstractMockRaftActor {
 924         public MockLeaderRaftActor(Map<String, String> peerAddresses, ConfigParams config,
 925                 RaftActorContext fromContext) {
 926             super(LEADER_ID, peerAddresses, Optional.of(config), NO_PERSISTENCE, null);
 927             setPersistence(false);
 928
 929             RaftActorContext context = getRaftActorContext();
 930             for(int i = 0; i < fromContext.getReplicatedLog().size(); i++) {
 931                 ReplicatedLogEntry entry = fromContext.getReplicatedLog().get(i);
 932                 getState().add(entry.getData());
 933                 context.getReplicatedLog().append(entry);
 934             }
 935
 936             context.setCommitIndex(fromContext.getCommitIndex());
 937             context.setLastApplied(fromContext.getLastApplied());
 938             context.getTermInformation().update(fromContext.getTermInformation().getCurrentTerm(),
 939                     fromContext.getTermInformation().getVotedFor());
 940         }
 941
 942         @Override
 943         protected void initializeBehavior() {
 944             changeCurrentBehavior(new Leader(getRaftActorContext()));
 945             initializeBehaviorComplete.countDown();
 946         }
 947
 948         @Override
 949         public void createSnapshot(ActorRef actorRef) {
 950             try {
 951                 actorRef.tell(new CaptureSnapshotReply(RaftActorTest.fromObject(getState()).toByteArray()), actorRef);
 952             } catch (Exception e) {
 953                 LOG.error("createSnapshot failed", e);
 954             }
 955         }
 956
 957         static Props props(Map<String, String> peerAddresses, RaftActorContext fromContext) {
 958             DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl();
 959             configParams.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
 960             configParams.setElectionTimeoutFactor(10);
 961             return Props.create(MockLeaderRaftActor.class, peerAddresses, configParams, fromContext);
 962         }
 963     }
 964
 965     public static class MockNewFollowerRaftActor extends AbstractMockRaftActor {
 966         public MockNewFollowerRaftActor(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
 967             super(NEW_SERVER_ID, Maps.<String, String>newHashMap(), Optional.of(config), null, collectorActor);
 968             setPersistence(false);
 969         }
 970
 971         static Props props(ConfigParams config, TestActorRef<MessageCollectorActor> collectorActor) {
 972             return Props.create(MockNewFollowerRaftActor.class, config, collectorActor);
 973         }
 974     }
 975 }