opendaylight/md-sal/sal-dummy-distributed-datastore/src/main/java/org/opendaylight/controller/dummy/datastore/DummyShard.java

   1 /*
   2  * Copyright (c) 2014 Cisco 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
   9 package org.opendaylight.controller.dummy.datastore;
  10
  11 import akka.actor.Props;
  12 import akka.actor.UntypedActor;
  13 import akka.japi.Creator;
  14 import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
  15 import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
  16 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
  17 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshot;
  18 import org.opendaylight.controller.cluster.raft.messages.InstallSnapshotReply;
  19 import org.opendaylight.controller.cluster.raft.messages.RequestVote;
  20 import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 public class DummyShard extends UntypedActor{
  25     private final Configuration configuration;
  26     private final String followerId;
  27     private final Logger LOG = LoggerFactory.getLogger(DummyShard.class);
  28     private long lastMessageIndex  = -1;
  29     private long lastMessageSize = 0;
  30
  31     public DummyShard(Configuration configuration, String followerId) {
  32         this.configuration = configuration;
  33         this.followerId = followerId;
  34         LOG.info("Creating : {}", followerId);
  35     }
  36
  37     @Override
  38     public void onReceive(Object o) throws Exception {
  39         if(o instanceof RequestVote){
  40             RequestVote req = (RequestVote) o;
  41             sender().tell(new RequestVoteReply(req.getTerm(), true), self());
  42         } else if(AppendEntries.LEGACY_SERIALIZABLE_CLASS.equals(o.getClass()) || o instanceof AppendEntries) {
  43             AppendEntries req = AppendEntries.fromSerializable(o);
  44             handleAppendEntries(req);
  45         } else if(InstallSnapshot.SERIALIZABLE_CLASS.equals(o.getClass())) {
  46             InstallSnapshot req = InstallSnapshot.fromSerializable(o);
  47             handleInstallSnapshot(req);
  48         } else if(o instanceof InstallSnapshot){
  49             handleInstallSnapshot((InstallSnapshot) o);
  50         } else {
  51             LOG.error("Unknown message : {}", o.getClass());
  52         }
  53     }
  54
  55     private void handleInstallSnapshot(InstallSnapshot req) {
  56         sender().tell(new InstallSnapshotReply(req.getTerm(), followerId, req.getChunkIndex(), true), self());
  57     }
  58
  59     protected void handleAppendEntries(AppendEntries req) throws InterruptedException {
  60
  61         LOG.info("{} - Received AppendEntries message : leader term = {}, index = {}, prevLogIndex = {}, size = {}",
  62                 followerId, req.getTerm(),req.getLeaderCommit(), req.getPrevLogIndex(), req.getEntries().size());
  63
  64         if(lastMessageIndex == req.getLeaderCommit() && req.getEntries().size() > 0 && lastMessageSize > 0){
  65             LOG.error("{} - Duplicate message with leaderCommit = {} prevLogIndex = {} received", followerId, req.getLeaderCommit(), req.getPrevLogIndex());
  66         }
  67
  68         lastMessageIndex = req.getLeaderCommit();
  69         lastMessageSize = req.getEntries().size();
  70
  71         long lastIndex = req.getLeaderCommit();
  72         if (req.getEntries().size() > 0) {
  73             for(ReplicatedLogEntry entry : req.getEntries()) {
  74                 lastIndex = entry.getIndex();
  75             }
  76         }
  77
  78         if (configuration.shouldCauseTrouble() && req.getEntries().size() > 0) {
  79             boolean ignore = false;
  80
  81             if (configuration.shouldDropReplies()) {
  82                 ignore = Math.random() > 0.5;
  83             }
  84
  85             long delay = (long) (Math.random() * configuration.getMaxDelayInMillis());
  86
  87             if (!ignore) {
  88                 LOG.info("{} - Randomizing delay : {}", followerId, delay);
  89                 Thread.sleep(delay);
  90                 sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm()), self());
  91             }
  92         } else {
  93             sender().tell(new AppendEntriesReply(followerId, req.getTerm(), true, lastIndex, req.getTerm()), self());
  94         }
  95     }
  96
  97     public static Props props(Configuration configuration, final String followerId) {
  98
  99         return Props.create(new DummyShardCreator(configuration, followerId));
 100     }
 101
 102     private static class DummyShardCreator implements Creator<DummyShard> {
 103
 104         private static final long serialVersionUID = 1L;
 105         private final Configuration configuration;
 106         private final String followerId;
 107
 108         DummyShardCreator(Configuration configuration, String followerId) {
 109             this.configuration = configuration;
 110             this.followerId = followerId;
 111         }
 112
 113         @Override
 114         public DummyShard create() throws Exception {
 115             return new DummyShard(configuration, followerId);
 116         }
 117     }
 118
 119 }