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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.zookeeper.server.quorum;
import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Vote {
private static final Logger LOG = LoggerFactory.getLogger(Vote.class);
public Vote(long id,
long zxid) {
this.version = 0x0;
this.id = id;
this.zxid = zxid;
this.electionEpoch = -1;
this.peerEpoch = -1;
this.state = ServerState.LOOKING;
}
public Vote(long id,
long zxid,
long peerEpoch) {
this.version = 0x0;
this.id = id;
this.zxid = zxid;
this.electionEpoch = -1;
this.peerEpoch = peerEpoch;
this.state = ServerState.LOOKING;
}
public Vote(long id,
long zxid,
long electionEpoch,
long peerEpoch) {
this.version = 0x0;
this.id = id;
this.zxid = zxid;
this.electionEpoch = electionEpoch;
this.peerEpoch = peerEpoch;
this.state = ServerState.LOOKING;
}
public Vote(int version,
long id,
long zxid,
long electionEpoch,
long peerEpoch,
ServerState state) {
this.version = version;
this.id = id;
this.zxid = zxid;
this.electionEpoch = electionEpoch;
this.state = state;
this.peerEpoch = peerEpoch;
}
public Vote(long id,
long zxid,
long electionEpoch,
long peerEpoch,
ServerState state) {
this.id = id;
this.zxid = zxid;
this.electionEpoch = electionEpoch;
this.state = state;
this.peerEpoch = peerEpoch;
this.version = 0x0;
}
final private int version;
final private long id;
final private long zxid;
final private long electionEpoch;
final private long peerEpoch;
public int getVersion() {
return version;
}
public long getId() {
return id;
}
public long getZxid() {
return zxid;
}
public long getElectionEpoch() {
return electionEpoch;
}
public long getPeerEpoch() {
return peerEpoch;
}
public ServerState getState() {
return state;
}
final private ServerState state;
@Override
public boolean equals(Object o) {
if (!(o instanceof Vote)) {
return false;
}
Vote other = (Vote) o;
/*
* There are two things going on in the logic below.
* First, we compare votes of servers out of election
* using only id and peer epoch. Second, if one version
* is 0x0 and the other isn't, then we only use the
* leader id. This case is here to enable rolling upgrades.
*
* {@see https://issues.apache.org/jira/browse/ZOOKEEPER-1805}
*/
if ((state == ServerState.LOOKING) ||
(other.state == ServerState.LOOKING)) {
return (id == other.id
&& zxid == other.zxid
&& electionEpoch == other.electionEpoch
&& peerEpoch == other.peerEpoch);
} else {
if ((version > 0x0) ^ (other.version > 0x0)) {
return id == other.id;
} else {
return (id == other.id
&& peerEpoch == other.peerEpoch);
}
}
}
@Override
public int hashCode() {
return (int) (id & zxid);
}
public String toString() {
return String.format("(%d, %s, %s)",
id,
Long.toHexString(zxid),
Long.toHexString(peerEpoch));
}
}