hadoop MultiStateTransitionListener 源码
haddop MultiStateTransitionListener 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/state/MultiStateTransitionListener.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.state;
import java.util.ArrayList;
import java.util.List;
/**
* A {@link StateTransitionListener} that dispatches the pre and post
* state transitions to multiple registered listeners.
* NOTE: The registered listeners are called in a for loop. Clients should
* know that a listener configured earlier might prevent a later listener
* from being called, if for instance it throws an un-caught Exception.
*/
public abstract class MultiStateTransitionListener
<OPERAND, EVENT, STATE extends Enum<STATE>> implements
StateTransitionListener<OPERAND, EVENT, STATE> {
private final List<StateTransitionListener<OPERAND, EVENT, STATE>> listeners =
new ArrayList<>();
/**
* Add a listener to the list of listeners.
* @param listener A listener.
*/
public void addListener(StateTransitionListener<OPERAND, EVENT, STATE>
listener) {
listeners.add(listener);
}
@Override
public void preTransition(OPERAND op, STATE beforeState,
EVENT eventToBeProcessed) {
for (StateTransitionListener<OPERAND, EVENT, STATE> listener : listeners) {
listener.preTransition(op, beforeState, eventToBeProcessed);
}
}
@Override
public void postTransition(OPERAND op, STATE beforeState, STATE afterState,
EVENT processedEvent) {
for (StateTransitionListener<OPERAND, EVENT, STATE> listener : listeners) {
listener.postTransition(op, beforeState, afterState, processedEvent);
}
}
}
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