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/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* 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.messages;
import com.google.common.annotations.VisibleForTesting;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.opendaylight.controller.cluster.raft.RaftVersions;
/**
* Reply for the AppendEntries message.
*/
public final class AppendEntriesReply extends AbstractRaftRPC {
@java.io.Serial
private static final long serialVersionUID = -7487547356392536683L;
// true if follower contained entry matching
// prevLogIndex and prevLogTerm
private final boolean success;
// The index of the last entry in the followers log
// This will be used to set the matchIndex for the follower on the
// Leader
private final long logLastIndex;
private final long logLastTerm;
// The followerId - this will be used to figure out which follower is
// responding
private final String followerId;
private final short payloadVersion;
private final short raftVersion;
private final boolean forceInstallSnapshot;
private final boolean needsLeaderAddress;
private final short recipientRaftVersion;
@VisibleForTesting
public AppendEntriesReply(final String followerId, final long term, final boolean success, final long logLastIndex,
final long logLastTerm, final short payloadVersion) {
this(followerId, term, success, logLastIndex, logLastTerm, payloadVersion, false, false,
RaftVersions.CURRENT_VERSION);
}
public AppendEntriesReply(final String followerId, final long term, final boolean success, final long logLastIndex,
final long logLastTerm, final short payloadVersion, final boolean forceInstallSnapshot,
final boolean needsLeaderAddress, final short recipientRaftVersion) {
this(followerId, term, success, logLastIndex, logLastTerm, payloadVersion, forceInstallSnapshot,
needsLeaderAddress, RaftVersions.CURRENT_VERSION, recipientRaftVersion);
}
AppendEntriesReply(final String followerId, final long term, final boolean success, final long logLastIndex,
final long logLastTerm, final short payloadVersion, final boolean forceInstallSnapshot,
final boolean needsLeaderAddress, final short raftVersion, final short recipientRaftVersion) {
super(term);
this.followerId = followerId;
this.success = success;
this.logLastIndex = logLastIndex;
this.logLastTerm = logLastTerm;
this.payloadVersion = payloadVersion;
this.forceInstallSnapshot = forceInstallSnapshot;
this.raftVersion = raftVersion;
this.needsLeaderAddress = needsLeaderAddress;
this.recipientRaftVersion = recipientRaftVersion;
}
public boolean isSuccess() {
return success;
}
public long getLogLastIndex() {
return logLastIndex;
}
public long getLogLastTerm() {
return logLastTerm;
}
public String getFollowerId() {
return followerId;
}
public short getPayloadVersion() {
return payloadVersion;
}
public short getRaftVersion() {
return raftVersion;
}
public boolean isForceInstallSnapshot() {
return forceInstallSnapshot;
}
public boolean isNeedsLeaderAddress() {
return needsLeaderAddress;
}
@Override
public String toString() {
return "AppendEntriesReply [term=" + getTerm() + ", success=" + success + ", followerId=" + followerId
+ ", logLastIndex=" + logLastIndex + ", logLastTerm=" + logLastTerm + ", forceInstallSnapshot="
+ forceInstallSnapshot + ", needsLeaderAddress=" + needsLeaderAddress
+ ", payloadVersion=" + payloadVersion + ", raftVersion=" + raftVersion
+ ", recipientRaftVersion=" + recipientRaftVersion + "]";
}
@Override
Object writeReplace() {
return recipientRaftVersion <= RaftVersions.FLUORINE_VERSION ? new Proxy2(this) : new AR(this);
}
/**
* Fluorine version that adds the needsLeaderAddress flag.
*/
private static class Proxy2 implements Externalizable {
@java.io.Serial
private static final long serialVersionUID = 1L;
private AppendEntriesReply appendEntriesReply;
// checkstyle flags the public modifier as redundant which really doesn't make sense since it clearly isn't
// redundant. It is explicitly needed for Java serialization to be able to create instances via reflection.
@SuppressWarnings("checkstyle:RedundantModifier")
public Proxy2() {
}
Proxy2(final AppendEntriesReply appendEntriesReply) {
this.appendEntriesReply = appendEntriesReply;
}
@Override
public void writeExternal(final ObjectOutput out) throws IOException {
out.writeShort(appendEntriesReply.raftVersion);
out.writeLong(appendEntriesReply.getTerm());
out.writeObject(appendEntriesReply.followerId);
out.writeBoolean(appendEntriesReply.success);
out.writeLong(appendEntriesReply.logLastIndex);
out.writeLong(appendEntriesReply.logLastTerm);
out.writeShort(appendEntriesReply.payloadVersion);
out.writeBoolean(appendEntriesReply.forceInstallSnapshot);
out.writeBoolean(appendEntriesReply.needsLeaderAddress);
}
@Override
public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
short raftVersion = in.readShort();
long term = in.readLong();
String followerId = (String) in.readObject();
boolean success = in.readBoolean();
long logLastIndex = in.readLong();
long logLastTerm = in.readLong();
short payloadVersion = in.readShort();
boolean forceInstallSnapshot = in.readBoolean();
boolean needsLeaderAddress = in.readBoolean();
appendEntriesReply = new AppendEntriesReply(followerId, term, success, logLastIndex, logLastTerm,
payloadVersion, forceInstallSnapshot, needsLeaderAddress, raftVersion,
RaftVersions.CURRENT_VERSION);
}
@java.io.Serial
private Object readResolve() {
return appendEntriesReply;
}
}
}
