opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/FollowerLogInformationImpl.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.cluster.raft;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Stopwatch;
  13 import java.util.concurrent.TimeUnit;
  14
  15 public class FollowerLogInformationImpl implements FollowerLogInformation {
  16     private final Stopwatch stopwatch = Stopwatch.createUnstarted();
  17
  18     private final RaftActorContext context;
  19
  20     private long nextIndex;
  21
  22     private long matchIndex;
  23
  24     private long lastReplicatedIndex = -1L;
  25
  26     private final Stopwatch lastReplicatedStopwatch = Stopwatch.createUnstarted();
  27
  28     private short payloadVersion = -1;
  29
  30     private final PeerInfo peerInfo;
  31
  32     public FollowerLogInformationImpl(PeerInfo peerInfo, long matchIndex, RaftActorContext context) {
  33         this.nextIndex = context.getCommitIndex();
  34         this.matchIndex = matchIndex;
  35         this.context = context;
  36         this.peerInfo = Preconditions.checkNotNull(peerInfo);
  37     }
  38
  39     @Override
  40     public long incrNextIndex() {
  41         return nextIndex++;
  42     }
  43
  44     @Override
  45     public long decrNextIndex() {
  46         return nextIndex--;
  47     }
  48
  49     @Override
  50     public boolean setNextIndex(long nextIndex) {
  51         if(this.nextIndex != nextIndex) {
  52             this.nextIndex = nextIndex;
  53             return true;
  54         }
  55
  56         return false;
  57     }
  58
  59     @Override
  60     public long incrMatchIndex(){
  61         return matchIndex++;
  62     }
  63
  64     @Override
  65     public boolean setMatchIndex(long matchIndex) {
  66         if(this.matchIndex != matchIndex) {
  67             this.matchIndex = matchIndex;
  68             return true;
  69         }
  70
  71         return false;
  72     }
  73
  74     @Override
  75     public String getId() {
  76         return peerInfo.getId();
  77     }
  78
  79     @Override
  80     public long getNextIndex() {
  81         return nextIndex;
  82     }
  83
  84     @Override
  85     public long getMatchIndex() {
  86         return matchIndex;
  87     }
  88
  89     @Override
  90     public boolean isFollowerActive() {
  91         if(peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
  92             return false;
  93         }
  94
  95         long elapsed = stopwatch.elapsed(TimeUnit.MILLISECONDS);
  96         return (stopwatch.isRunning()) &&
  97                 (elapsed <= context.getConfigParams().getElectionTimeOutInterval().toMillis());
  98     }
  99
 100     @Override
 101     public void markFollowerActive() {
 102         if (stopwatch.isRunning()) {
 103             stopwatch.reset();
 104         }
 105         stopwatch.start();
 106     }
 107
 108     @Override
 109     public void markFollowerInActive() {
 110         if (stopwatch.isRunning()) {
 111             stopwatch.stop();
 112         }
 113     }
 114
 115     @Override
 116     public long timeSinceLastActivity() {
 117         return stopwatch.elapsed(TimeUnit.MILLISECONDS);
 118     }
 119
 120     @Override
 121     public boolean okToReplicate() {
 122         if(peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
 123             return false;
 124         }
 125
 126         // Return false if we are trying to send duplicate data before the heartbeat interval
 127         if(getNextIndex() == lastReplicatedIndex){
 128             if(lastReplicatedStopwatch.elapsed(TimeUnit.MILLISECONDS) < context.getConfigParams()
 129                     .getHeartBeatInterval().toMillis()){
 130                 return false;
 131             }
 132         }
 133
 134         resetLastReplicated();
 135         return true;
 136     }
 137
 138     private void resetLastReplicated(){
 139         lastReplicatedIndex = getNextIndex();
 140         if(lastReplicatedStopwatch.isRunning()){
 141             lastReplicatedStopwatch.reset();
 142         }
 143         lastReplicatedStopwatch.start();
 144     }
 145
 146     @Override
 147     public short getPayloadVersion() {
 148         return payloadVersion;
 149     }
 150
 151     @Override
 152     public void setPayloadVersion(short payloadVersion) {
 153         this.payloadVersion = payloadVersion;
 154     }
 155
 156     @Override
 157     public String toString() {
 158         return "FollowerLogInformationImpl [id=" + getId() + ", nextIndex=" + nextIndex + ", matchIndex=" + matchIndex
 159                 + ", lastReplicatedIndex=" + lastReplicatedIndex + ", votingState=" + peerInfo.getVotingState()
 160                 + ", stopwatch=" + stopwatch.elapsed(TimeUnit.MILLISECONDS) + ", followerTimeoutMillis="
 161                 + context.getConfigParams().getElectionTimeOutInterval().toMillis() + "]";
 162     }
 163 }