Make Netty-3 dependency optional
[controller.git] / opendaylight / md-sal / sal-akka-raft / src / test / java / org / opendaylight / controller / cluster / raft / behaviors / LeaderTest.java
index af4819090e9cede78d3679f2b228e7055c785703..0f16f92c4951ef4c018e9aeebe977d8ce447e754 100644 (file)
@@ -5,7 +5,6 @@
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
  * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.controller.cluster.raft.behaviors;
 
 import static org.junit.Assert.assertEquals;
@@ -26,18 +25,16 @@ import akka.actor.Terminated;
 import akka.protobuf.ByteString;
 import akka.testkit.TestActorRef;
 import akka.testkit.javadsl.TestKit;
-import com.google.common.base.Optional;
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap;
 import com.google.common.io.ByteSource;
 import com.google.common.util.concurrent.Uninterruptibles;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
+import java.util.OptionalInt;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 import org.apache.commons.lang3.SerializationUtils;
@@ -66,6 +63,7 @@ import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshotReply;
+import org.opendaylight.controller.cluster.raft.messages.Payload;
 import org.opendaylight.controller.cluster.raft.messages.RaftRPC;
 import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
 import org.opendaylight.controller.cluster.raft.persisted.ApplyJournalEntries;
@@ -74,7 +72,6 @@ import org.opendaylight.controller.cluster.raft.persisted.SimpleReplicatedLogEnt
 import org.opendaylight.controller.cluster.raft.persisted.Snapshot;
 import org.opendaylight.controller.cluster.raft.policy.DefaultRaftPolicy;
 import org.opendaylight.controller.cluster.raft.policy.RaftPolicy;
-import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
 import org.opendaylight.controller.cluster.raft.utils.ForwardMessageToBehaviorActor;
 import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
 import org.opendaylight.yangtools.concepts.Identifier;
@@ -171,9 +168,8 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
     private RaftActorBehavior sendReplicate(final MockRaftActorContext actorContext, final long term, final long index,
             final Payload payload) {
-        SimpleReplicatedLogEntry newEntry = new SimpleReplicatedLogEntry(index, term, payload);
-        actorContext.getReplicatedLog().append(newEntry);
-        return leader.handleMessage(leaderActor, new Replicate(null, null, newEntry, true));
+        actorContext.getReplicatedLog().append(new SimpleReplicatedLogEntry(index, term, payload));
+        return leader.handleMessage(leaderActor, new Replicate(index, true, null, null));
     }
 
     @Test
@@ -404,7 +400,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
             final int messageNr) {
         final AppendEntries commitReq = allMessages.get(2 * messageNr + 1);
         assertEquals(lastIndex + messageNr + 1, commitReq.getLeaderCommit());
-        assertEquals(ImmutableList.of(), commitReq.getEntries());
+        assertEquals(List.of(), commitReq.getEntries());
     }
 
     private static void assertRequestEntry(final long lastIndex, final List<AppendEntries> allMessages,
@@ -549,16 +545,14 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         actorContext.setLastApplied(0);
 
-        long newLogIndex = actorContext.getReplicatedLog().lastIndex() + 1;
-        long term = actorContext.getTermInformation().getCurrentTerm();
-        ReplicatedLogEntry newEntry = new SimpleReplicatedLogEntry(
-                newLogIndex, term, new MockRaftActorContext.MockPayload("foo"));
+        final long newLogIndex = actorContext.getReplicatedLog().lastIndex() + 1;
+        final long term = actorContext.getTermInformation().getCurrentTerm();
+        final var data = new MockRaftActorContext.MockPayload("foo");
 
-        actorContext.getReplicatedLog().append(newEntry);
+        actorContext.getReplicatedLog().append(new SimpleReplicatedLogEntry(newLogIndex, term, data));
 
         final Identifier id = new MockIdentifier("state-id");
-        RaftActorBehavior raftBehavior = leader.handleMessage(leaderActor,
-                new Replicate(leaderActor, id, newEntry, true));
+        final var raftBehavior = leader.handleMessage(leaderActor, new Replicate(newLogIndex, true, leaderActor, id));
 
         // State should not change
         assertTrue(raftBehavior instanceof Leader);
@@ -567,8 +561,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         // We should get 2 ApplyState messages - 1 for new log entry and 1 for the previous
         // one since lastApplied state is 0.
-        List<ApplyState> applyStateList = MessageCollectorActor.getAllMatching(
-                leaderActor, ApplyState.class);
+        final var applyStateList = MessageCollectorActor.getAllMatching(leaderActor, ApplyState.class);
         assertEquals("ApplyState count", newLogIndex, applyStateList.size());
 
         for (int i = 0; i <= newLogIndex - 1; i++) {
@@ -578,7 +571,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         }
 
         ApplyState last = applyStateList.get((int) newLogIndex - 1);
-        assertEquals("getData", newEntry.getData(), last.getReplicatedLogEntry().getData());
+        assertEquals("getData", data, last.getReplicatedLogEntry().getData());
         assertEquals("getIdentifier", id, last.getIdentifier());
     }
 
@@ -588,11 +581,6 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         final MockRaftActorContext actorContext = createActorContextWithFollower();
 
-        Map<String, String> leadersSnapshot = new HashMap<>();
-        leadersSnapshot.put("1", "A");
-        leadersSnapshot.put("2", "B");
-        leadersSnapshot.put("3", "C");
-
         //clears leaders log
         actorContext.getReplicatedLog().removeFrom(0);
 
@@ -615,12 +603,12 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         //update follower timestamp
         leader.markFollowerActive(FOLLOWER_ID);
 
-        ByteString bs = toByteString(leadersSnapshot);
+        ByteString bs = toByteString(Map.of("1", "A", "2", "B", "3", "C"));
         leader.setSnapshotHolder(new SnapshotHolder(Snapshot.create(ByteState.of(bs.toByteArray()),
-                Collections.<ReplicatedLogEntry>emptyList(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
+                List.of(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
                 -1, null, null), ByteSource.wrap(bs.toByteArray())));
         LeaderInstallSnapshotState fts = new LeaderInstallSnapshotState(
-                actorContext.getConfigParams().getSnapshotChunkSize(), leader.logName());
+                actorContext.getConfigParams().getMaximumMessageSliceSize(), leader.logName());
         fts.setSnapshotBytes(ByteSource.wrap(bs.toByteArray()));
         leader.getFollower(FOLLOWER_ID).setLeaderInstallSnapshotState(fts);
 
@@ -678,18 +666,15 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
 
         // new entry
-        SimpleReplicatedLogEntry entry =
-                new SimpleReplicatedLogEntry(newEntryIndex, currentTerm,
-                        new MockRaftActorContext.MockPayload("D"));
-
-        actorContext.getReplicatedLog().append(entry);
+        actorContext.getReplicatedLog().append(
+            new SimpleReplicatedLogEntry(newEntryIndex, currentTerm, new MockRaftActorContext.MockPayload("D")));
 
         //update follower timestamp
         leader.markFollowerActive(FOLLOWER_ID);
 
         // this should invoke a sendinstallsnapshot as followersLastIndex < snapshotIndex
         RaftActorBehavior raftBehavior = leader.handleMessage(
-                leaderActor, new Replicate(null, new MockIdentifier("state-id"), entry, true));
+                leaderActor, new Replicate(newEntryIndex, true, null, new MockIdentifier("state-id")));
 
         assertTrue(raftBehavior instanceof Leader);
 
@@ -726,15 +711,13 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.setSnapshotHolder(null);
 
         // new entry
-        SimpleReplicatedLogEntry entry = new SimpleReplicatedLogEntry(newEntryIndex, currentTerm,
-                new MockRaftActorContext.MockPayload("D"));
-
-        actorContext.getReplicatedLog().append(entry);
+        actorContext.getReplicatedLog().append(
+            new SimpleReplicatedLogEntry(newEntryIndex, currentTerm, new MockRaftActorContext.MockPayload("D")));
 
         //update follower timestamp
         leader.markFollowerActive(FOLLOWER_ID);
 
-        leader.handleMessage(leaderActor, new Replicate(null, new MockIdentifier("state-id"), entry, true));
+        leader.handleMessage(leaderActor, new Replicate(newEntryIndex, true, null, new MockIdentifier("state-id")));
 
         assertEquals("isCapturing", true, actorContext.getSnapshotManager().isCapturing());
 
@@ -746,7 +729,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         assertEquals(2, cs.getLastTerm());
 
         // if an initiate is started again when first is in progress, it shouldnt initiate Capture
-        leader.handleMessage(leaderActor, new Replicate(null, new MockIdentifier("state-id"), entry, true));
+        leader.handleMessage(leaderActor, new Replicate(newEntryIndex, true, null, new MockIdentifier("state-id")));
 
         assertSame("CaptureSnapshot instance", cs, actorContext.getSnapshotManager().getCaptureSnapshot());
     }
@@ -771,7 +754,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         actorContext.getReplicatedLog().removeFrom(0);
 
-        AtomicReference<java.util.Optional<OutputStream>> installSnapshotStream = new AtomicReference<>();
+        AtomicReference<Optional<OutputStream>> installSnapshotStream = new AtomicReference<>();
         actorContext.setCreateSnapshotProcedure(installSnapshotStream::set);
 
         leader = new Leader(actorContext);
@@ -789,10 +772,8 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         }
 
         // new entry
-        SimpleReplicatedLogEntry entry = new SimpleReplicatedLogEntry(newEntryIndex, currentTerm,
-                new MockRaftActorContext.MockPayload("D"));
-
-        actorContext.getReplicatedLog().append(entry);
+        actorContext.getReplicatedLog().append(
+            new SimpleReplicatedLogEntry(newEntryIndex, currentTerm, new MockRaftActorContext.MockPayload("D")));
 
         //update follower timestamp
         leader.markFollowerActive(FOLLOWER_ID);
@@ -816,7 +797,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MessageCollectorActor.clearMessages(followerActor);
 
         // Sending Replicate message should not initiate another capture since the first is in progress.
-        leader.handleMessage(leaderActor, new Replicate(null, new MockIdentifier("state-id"), entry, true));
+        leader.handleMessage(leaderActor, new Replicate(newEntryIndex, true, null, new MockIdentifier("state-id")));
         assertSame("CaptureSnapshot instance", cs, actorContext.getSnapshotManager().getCaptureSnapshot());
 
         // Similarly sending another AppendEntriesReply to force a snapshot should not initiate another capture.
@@ -826,7 +807,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         // Now simulate the CaptureSnapshotReply to initiate snapshot install - the first chunk should be sent.
         final byte[] bytes = new byte[]{1, 2, 3};
-        installSnapshotStream.get().get().write(bytes);
+        installSnapshotStream.get().orElseThrow().write(bytes);
         actorContext.getSnapshotManager().persist(ByteState.of(bytes), installSnapshotStream.get(),
                 Runtime.getRuntime().totalMemory());
         MessageCollectorActor.expectFirstMatching(followerActor, InstallSnapshot.class);
@@ -874,7 +855,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.getFollower(FOLLOWER_ID).setNextIndex(0);
 
         byte[] bytes = toByteString(leadersSnapshot).toByteArray();
-        Snapshot snapshot = Snapshot.create(ByteState.of(bytes), Collections.<ReplicatedLogEntry>emptyList(),
+        Snapshot snapshot = Snapshot.create(ByteState.of(bytes), List.of(),
                 lastAppliedIndex, snapshotTerm, lastAppliedIndex, snapshotTerm, -1, null, null);
 
         RaftActorBehavior raftBehavior = leader.handleMessage(leaderActor,
@@ -926,7 +907,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.getFollower(FOLLOWER_ID).setNextIndex(-1);
 
         byte[] bytes = toByteString(leadersSnapshot).toByteArray();
-        Snapshot snapshot = Snapshot.create(ByteState.of(bytes), Collections.<ReplicatedLogEntry>emptyList(),
+        Snapshot snapshot = Snapshot.create(ByteState.of(bytes), List.of(),
                 lastAppliedIndex, snapshotTerm, lastAppliedIndex, snapshotTerm, -1, null, null);
 
         RaftActorBehavior raftBehavior = leader.handleMessage(leaderActor,
@@ -981,10 +962,10 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         ByteString bs = toByteString(leadersSnapshot);
         leader.setSnapshotHolder(new SnapshotHolder(Snapshot.create(ByteState.of(bs.toByteArray()),
-                Collections.<ReplicatedLogEntry>emptyList(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
+                List.of(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
                 -1, null, null), ByteSource.wrap(bs.toByteArray())));
         LeaderInstallSnapshotState fts = new LeaderInstallSnapshotState(
-                actorContext.getConfigParams().getSnapshotChunkSize(), leader.logName());
+                actorContext.getConfigParams().getMaximumMessageSliceSize(), leader.logName());
         fts.setSnapshotBytes(ByteSource.wrap(bs.toByteArray()));
         leader.getFollower(FOLLOWER_ID).setLeaderInstallSnapshotState(fts);
         while (!fts.isLastChunk(fts.getChunkIndex())) {
@@ -1022,7 +1003,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         DefaultConfigParamsImpl configParams = new DefaultConfigParamsImpl() {
             @Override
-            public int getSnapshotChunkSize() {
+            public int getMaximumMessageSliceSize() {
                 return 50;
             }
         };
@@ -1050,8 +1031,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         ByteString bs = toByteString(leadersSnapshot);
         Snapshot snapshot = Snapshot.create(ByteState.of(bs.toByteArray()),
-                Collections.<ReplicatedLogEntry>emptyList(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
-                -1, null, null);
+                List.of(), commitIndex, snapshotTerm, commitIndex, snapshotTerm, -1, null, null);
 
         leader.handleMessage(leaderActor, new SendInstallSnapshot(snapshot, ByteSource.wrap(bs.toByteArray())));
 
@@ -1100,7 +1080,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         actorContext.setConfigParams(new DefaultConfigParamsImpl() {
             @Override
-            public int getSnapshotChunkSize() {
+            public int getMaximumMessageSliceSize() {
                 return 50;
             }
         });
@@ -1124,8 +1104,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         ByteString bs = toByteString(leadersSnapshot);
         Snapshot snapshot = Snapshot.create(ByteState.of(bs.toByteArray()),
-                Collections.<ReplicatedLogEntry>emptyList(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
-                -1, null, null);
+                List.of(), commitIndex, snapshotTerm, commitIndex, snapshotTerm, -1, null, null);
 
         Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
         leader.handleMessage(leaderActor, new SendInstallSnapshot(snapshot, ByteSource.wrap(bs.toByteArray())));
@@ -1165,7 +1144,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         actorContext.setConfigParams(new DefaultConfigParamsImpl() {
             @Override
-            public int getSnapshotChunkSize() {
+            public int getMaximumMessageSliceSize() {
                 return 50;
             }
         });
@@ -1189,8 +1168,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         ByteString bs = toByteString(leadersSnapshot);
         Snapshot snapshot = Snapshot.create(ByteState.of(bs.toByteArray()),
-                Collections.<ReplicatedLogEntry>emptyList(), commitIndex, snapshotTerm, commitIndex, snapshotTerm,
-                -1, null, null);
+                List.of(), commitIndex, snapshotTerm, commitIndex, snapshotTerm, -1, null, null);
 
         leader.handleMessage(leaderActor, new SendInstallSnapshot(snapshot, ByteSource.wrap(bs.toByteArray())));
 
@@ -1199,8 +1177,8 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         assertEquals(1, installSnapshot.getChunkIndex());
         assertEquals(3, installSnapshot.getTotalChunks());
-        assertEquals(LeaderInstallSnapshotState.INITIAL_LAST_CHUNK_HASH_CODE,
-                installSnapshot.getLastChunkHashCode().getAsInt());
+        assertEquals(OptionalInt.of(LeaderInstallSnapshotState.INITIAL_LAST_CHUNK_HASH_CODE),
+                installSnapshot.getLastChunkHashCode());
 
         final int hashCode = Arrays.hashCode(installSnapshot.getData());
 
@@ -1213,7 +1191,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
         assertEquals(2, installSnapshot.getChunkIndex());
         assertEquals(3, installSnapshot.getTotalChunks());
-        assertEquals(hashCode, installSnapshot.getLastChunkHashCode().getAsInt());
+        assertEquals(OptionalInt.of(hashCode), installSnapshot.getLastChunkHashCode());
     }
 
     @Test
@@ -1283,8 +1261,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
 
     private MockRaftActorContext createActorContextWithFollower() {
         MockRaftActorContext actorContext = createActorContext();
-        actorContext.setPeerAddresses(ImmutableMap.<String, String>builder().put(FOLLOWER_ID,
-                followerActor.path().toString()).build());
+        actorContext.setPeerAddresses(Map.of(FOLLOWER_ID, followerActor.path().toString()));
         return actorContext;
     }
 
@@ -1293,7 +1270,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         DefaultConfigParamsImpl followerConfig = new DefaultConfigParamsImpl();
         followerConfig.setElectionTimeoutFactor(10000);
         followerActorContext.setConfigParams(followerConfig);
-        followerActorContext.setPeerAddresses(ImmutableMap.of(LEADER_ID, leaderActor.path().toString()));
+        followerActorContext.setPeerAddresses(Map.of(LEADER_ID, leaderActor.path().toString()));
         return followerActorContext;
     }
 
@@ -1359,7 +1336,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         final MockRaftActorContext leaderActorContext = createActorContext();
 
         MockRaftActorContext followerActorContext = createActorContext(FOLLOWER_ID, followerActor);
-        followerActorContext.setPeerAddresses(ImmutableMap.of(LEADER_ID, leaderActor.path().toString()));
+        followerActorContext.setPeerAddresses(Map.of(LEADER_ID, leaderActor.path().toString()));
 
         Follower follower = new Follower(followerActorContext);
         followerActor.underlyingActor().setBehavior(follower);
@@ -1740,7 +1717,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         FollowerLogInformation followerInfo = leader.getFollower(FOLLOWER_ID);
 
         assertEquals(payloadVersion, leader.getLeaderPayloadVersion());
-        assertEquals(RaftVersions.HELIUM_VERSION, followerInfo.getRaftVersion());
+        assertEquals(RaftVersions.FLUORINE_VERSION, followerInfo.getRaftVersion());
 
         AppendEntriesReply reply = new AppendEntriesReply(FOLLOWER_ID, 1, true, 2, 1, payloadVersion);
 
@@ -1794,7 +1771,8 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MockRaftActorContext leaderActorContext = createActorContextWithFollower();
         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setHeartBeatInterval(
                 new FiniteDuration(1000, TimeUnit.SECONDS));
-        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setSnapshotChunkSize(2);
+        // Note: the size here depends on estimate
+        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setMaximumMessageSliceSize(246);
 
         leaderActorContext.setReplicatedLog(
                 new MockRaftActorContext.MockReplicatedLogBuilder().createEntries(0, 4, 1).build());
@@ -2139,7 +2117,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.transferLeadership(mockTransferCohort);
 
         verify(mockTransferCohort, never()).transferComplete();
-        doReturn(Optional.absent()).when(mockTransferCohort).getRequestedFollowerId();
+        doReturn(Optional.empty()).when(mockTransferCohort).getRequestedFollowerId();
         MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
         leader.handleMessage(leaderActor, new AppendEntriesReply(FOLLOWER_ID, 1, true, 0, 1, (short)0));
 
@@ -2170,7 +2148,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MessageCollectorActor.clearMessages(followerActor);
 
         RaftActorLeadershipTransferCohort mockTransferCohort = mock(RaftActorLeadershipTransferCohort.class);
-        doReturn(Optional.absent()).when(mockTransferCohort).getRequestedFollowerId();
+        doReturn(Optional.empty()).when(mockTransferCohort).getRequestedFollowerId();
         leader.transferLeadership(mockTransferCohort);
 
         verify(mockTransferCohort, never()).transferComplete();
@@ -2202,7 +2180,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MessageCollectorActor.clearMessages(followerActor);
 
         RaftActorLeadershipTransferCohort mockTransferCohort = mock(RaftActorLeadershipTransferCohort.class);
-        doReturn(Optional.absent()).when(mockTransferCohort).getRequestedFollowerId();
+        doReturn(Optional.empty()).when(mockTransferCohort).getRequestedFollowerId();
         leader.transferLeadership(mockTransferCohort);
 
         verify(mockTransferCohort, never()).transferComplete();
@@ -2269,7 +2247,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         logStart("testReplicationWithPayloadSizeThatExceedsThreshold");
 
         final int serializedSize = SerializationUtils.serialize(new AppendEntries(1, LEADER_ID, -1, -1,
-                Arrays.asList(new SimpleReplicatedLogEntry(0, 1,
+                List.of(new SimpleReplicatedLogEntry(0, 1,
                         new MockRaftActorContext.MockPayload("large"))), 0, -1, (short)0)).length;
         final MockRaftActorContext.MockPayload largePayload =
                 new MockRaftActorContext.MockPayload("large", serializedSize);
@@ -2277,7 +2255,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MockRaftActorContext leaderActorContext = createActorContextWithFollower();
         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setHeartBeatInterval(
                 new FiniteDuration(300, TimeUnit.MILLISECONDS));
-        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setSnapshotChunkSize(serializedSize - 50);
+        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setMaximumMessageSliceSize(serializedSize - 50);
         leaderActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().build());
         leaderActorContext.setCommitIndex(-1);
         leaderActorContext.setLastApplied(-1);
@@ -2361,7 +2339,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setHeartBeatInterval(
                 new FiniteDuration(100, TimeUnit.MILLISECONDS));
         ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setElectionTimeoutFactor(1);
-        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setSnapshotChunkSize(10);
+        ((DefaultConfigParamsImpl)leaderActorContext.getConfigParams()).setMaximumMessageSliceSize(10);
         leaderActorContext.setReplicatedLog(new MockRaftActorContext.MockReplicatedLogBuilder().build());
         leaderActorContext.setCommitIndex(-1);
         leaderActorContext.setLastApplied(-1);
@@ -2376,7 +2354,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         MessageCollectorActor.clearMessages(followerActor);
 
         sendReplicate(leaderActorContext, term, 0, new MockRaftActorContext.MockPayload("large",
-                leaderActorContext.getConfigParams().getSnapshotChunkSize() + 1));
+                leaderActorContext.getConfigParams().getMaximumMessageSliceSize() + 1));
         MessageCollectorActor.expectFirstMatching(followerActor, MessageSlice.class);
 
         // Sleep for at least 3 * election timeout so the slicing state expires.
@@ -2423,7 +2401,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         // Initial heartbeat shouldn't have the leader address
 
         AppendEntries appendEntries = MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
-        assertFalse(appendEntries.getLeaderAddress().isPresent());
+        assertNull(appendEntries.leaderAddress());
         MessageCollectorActor.clearMessages(followerActor);
 
         // Send AppendEntriesReply indicating the follower needs the leader address
@@ -2438,8 +2416,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.handleMessage(leaderActor, SendHeartBeat.INSTANCE);
 
         appendEntries = MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
-        assertTrue(appendEntries.getLeaderAddress().isPresent());
-        assertEquals(leaderActor.path().toString(), appendEntries.getLeaderAddress().get());
+        assertEquals(leaderActor.path().toString(), appendEntries.leaderAddress());
         MessageCollectorActor.clearMessages(followerActor);
 
         // Send AppendEntriesReply indicating the follower does not need the leader address
@@ -2453,7 +2430,7 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         leader.handleMessage(leaderActor, SendHeartBeat.INSTANCE);
 
         appendEntries = MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
-        assertFalse(appendEntries.getLeaderAddress().isPresent());
+        assertNull(appendEntries.leaderAddress());
     }
 
     @Override
@@ -2463,14 +2440,14 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         assertEquals("New votedFor", null, actorContext.getTermInformation().getVotedFor());
     }
 
-    private class MockConfigParamsImpl extends DefaultConfigParamsImpl {
+    private static class MockConfigParamsImpl extends DefaultConfigParamsImpl {
 
         private final long electionTimeOutIntervalMillis;
-        private final int snapshotChunkSize;
+        private final int maximumMessageSliceSize;
 
-        MockConfigParamsImpl(final long electionTimeOutIntervalMillis, final int snapshotChunkSize) {
+        MockConfigParamsImpl(final long electionTimeOutIntervalMillis, final int maximumMessageSliceSize) {
             this.electionTimeOutIntervalMillis = electionTimeOutIntervalMillis;
-            this.snapshotChunkSize = snapshotChunkSize;
+            this.maximumMessageSliceSize = maximumMessageSliceSize;
         }
 
         @Override
@@ -2479,8 +2456,8 @@ public class LeaderTest extends AbstractLeaderTest<Leader> {
         }
 
         @Override
-        public int getSnapshotChunkSize() {
-            return snapshotChunkSize;
+        public int getMaximumMessageSliceSize() {
+            return maximumMessageSliceSize;
         }
     }
 }