hadoop TimelineServiceHelper 源码
haddop TimelineServiceHelper 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/TimelineServiceHelper.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.util;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
/**
* Helper class for Timeline service.
*/
@LimitedPrivate({ "MapReduce", "YARN" })
public final class TimelineServiceHelper {
private TimelineServiceHelper() {
// Utility classes should not have a public or default constructor.
}
/**
* Cast map to HashMap for generic type.
* @param originalMap the map need to be casted
* @param <E> key type
* @param <V> value type
* @return casted HashMap object
*/
public static <E, V> HashMap<E, V> mapCastToHashMap(
Map<E, V> originalMap) {
return originalMap == null ? null : originalMap instanceof HashMap ?
(HashMap<E, V>) originalMap : new HashMap<E, V>(originalMap);
}
/**
* Inverts the given key.
* @param key value to be inverted .
* @return inverted long
*/
public static long invertLong(long key) {
return Long.MAX_VALUE - key;
}
}
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