hadoop RemoteEditLog 源码
haddop RemoteEditLog 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/RemoteEditLog.java
/**
* 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.hadoop.hdfs.server.protocol;
import org.apache.hadoop.thirdparty.com.google.common.collect.ComparisonChain;
import java.util.function.Function;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
public class RemoteEditLog implements Comparable<RemoteEditLog> {
private long startTxId = HdfsServerConstants.INVALID_TXID;
private long endTxId = HdfsServerConstants.INVALID_TXID;
private boolean isInProgress = false;
public RemoteEditLog() {
}
public RemoteEditLog(long startTxId, long endTxId) {
this.startTxId = startTxId;
this.endTxId = endTxId;
this.isInProgress = (endTxId == HdfsServerConstants.INVALID_TXID);
}
public RemoteEditLog(long startTxId, long endTxId, boolean inProgress) {
this.startTxId = startTxId;
this.endTxId = endTxId;
this.isInProgress = inProgress;
}
public long getStartTxId() {
return startTxId;
}
public long getEndTxId() {
return endTxId;
}
public boolean isInProgress() {
return isInProgress;
}
@Override
public String toString() {
if (!isInProgress) {
return "[" + startTxId + "," + endTxId + "]";
} else {
return "[" + startTxId + "-? (in-progress)]";
}
}
@Override
public int compareTo(RemoteEditLog log) {
return ComparisonChain.start()
.compare(startTxId, log.startTxId)
.compare(endTxId, log.endTxId)
.result();
}
@Override
public boolean equals(Object o) {
if (!(o instanceof RemoteEditLog)) return false;
return this.compareTo((RemoteEditLog)o) == 0;
}
@Override
public int hashCode() {
return (int) (startTxId * endTxId);
}
/**
* Java <code>Function</code> which applies {@link #getStartTxId()}
*/
public static final Function<RemoteEditLog, Long> GET_START_TXID =
log -> {
if (null == log) {
return HdfsServerConstants.INVALID_TXID;
}
return log.getStartTxId();
};
}
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