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