hadoop AbstractEvent 源码
haddop AbstractEvent 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AbstractEvent.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.yarn.event;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
/**
* Parent class of all the events. All events extend this class.
*/
@Public
@Evolving
public abstract class AbstractEvent<TYPE extends Enum<TYPE>>
implements Event<TYPE> {
private final TYPE type;
private final long timestamp;
// use this if you DON'T care about the timestamp
public AbstractEvent(TYPE type) {
this.type = type;
// We're not generating a real timestamp here. It's too expensive.
timestamp = -1L;
}
// use this if you care about the timestamp
public AbstractEvent(TYPE type, long timestamp) {
this.type = type;
this.timestamp = timestamp;
}
@Override
public long getTimestamp() {
return timestamp;
}
@Override
public TYPE getType() {
return type;
}
@Override
public String toString() {
return "EventType: " + getType();
}
}
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