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RaftMember.java
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RaftMember.java
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/*
* Copyright 2015 the original author or authors.
*
* Licensed 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 net.kuujo.copycat.protocol.raft;
import net.kuujo.copycat.io.Buffer;
import net.kuujo.copycat.io.serializer.Writable;
import net.kuujo.copycat.io.util.ReferenceCounted;
import net.kuujo.copycat.io.util.ReferenceManager;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Raft cluster member.
*
* @author <a href="http://github.com/kuujo">Jordan Halterman</a>
*/
public class RaftMember implements ReferenceCounted<RaftMember>, Writable {
/**
* Returns a new Raft member builder.
*
* @return A new Raft member builder.
*/
public static Builder builder() {
return new Builder();
}
/**
* Raft member builder.
*/
public static class Builder {
private int id;
private Builder() {
}
/**
* Sets the member ID.
*
* @param id The member ID.
* @return The member builder.
*/
public Builder withId(int id) {
this.id = id;
return this;
}
/**
* Builds the member.
*
* @return A new Raft member.
*/
public RaftMember build() {
return new RaftMember(id);
}
}
private final ReferenceManager<RaftMember> referenceManager;
private final AtomicInteger references = new AtomicInteger();
private int id;
private long version = 1;
private long commitIndex;
private long recycleIndex;
protected RaftMember(ReferenceManager<RaftMember> referenceManager) {
this.referenceManager = referenceManager;
}
RaftMember(int id) {
this.referenceManager = null;
this.id = id;
}
/**
* Resets the member.
*/
protected void reset() {
references.set(1);
}
/**
* Returns the member ID.
*
* @return The member ID.
*/
public int id() {
return id;
}
/**
* Returns the member version.
*
* @return The member version.
*/
public long version() {
return version;
}
/**
* Sets the member version.
*
* @param version The member version.
* @return The member info.
*/
RaftMember version(long version) {
this.version = version;
return this;
}
/**
* Returns the member's commit index.
*
* @return The member's commit index.
*/
public long commitIndex() {
return commitIndex;
}
/**
* Sets the member index.
*
* @param index The member's commit index.
* @return The member info.
*/
RaftMember commitIndex(long index) {
this.commitIndex = index;
return this;
}
/**
* Returns the member's recycle index.
*
* @return The member's recycle index.
*/
public long recycleIndex() {
return recycleIndex;
}
/**
* Sets the member's recycle index.
*
* @param index The member's recycle index.
* @return The member info.
*/
RaftMember recycleIndex(long index) {
this.recycleIndex = index;
return this;
}
/**
* Updates the member info.
*
* @param info The member info to update.
* @return Indicates whether the member's state was updated.
*/
boolean update(RaftMember info) {
if (info.version > this.version) {
this.version = info.version;
this.commitIndex = info.commitIndex;
this.recycleIndex = info.recycleIndex;
return true;
}
return false;
}
@Override
public RaftMember acquire() {
references.incrementAndGet();
return this;
}
@Override
public void release() {
if (references.decrementAndGet() == 0)
close();
}
@Override
public int references() {
return references.get();
}
@Override
public void readObject(Buffer buffer) {
id = buffer.readInt();
version = buffer.readLong();
commitIndex = buffer.readLong();
recycleIndex = buffer.readLong();
}
@Override
public void writeObject(Buffer buffer) {
buffer.writeInt(id)
.writeLong(version)
.writeLong(commitIndex)
.writeLong(recycleIndex);
}
@Override
public void close() {
referenceManager.release(this);
}
@Override
public boolean equals(Object object) {
if (object instanceof RaftMember) {
RaftMember member = (RaftMember) object;
return member.id == id
&& member.version == version
&& member.commitIndex == commitIndex
&& member.recycleIndex == recycleIndex;
}
return false;
}
@Override
public int hashCode() {
int hashCode = 17;
hashCode = 37 * hashCode + id;
hashCode = 37 * hashCode + (int)(version ^ (version >>> 32));
hashCode = 37 * hashCode + (int)(commitIndex ^ (commitIndex >>> 32));
hashCode = 37 * hashCode + (int)(recycleIndex ^ (recycleIndex >>> 32));
return hashCode;
}
@Override
public String toString() {
return String.format("RaftMember[id=%s, version=%d, commitIndex=%d, recycleIndex=%d]", id, version, commitIndex, recycleIndex);
}
}