hadoop Platforms 源码
haddop Platforms 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/Platforms.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.mapred.nativetask;
import java.io.IOException;
import java.util.ServiceLoader;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.nativetask.serde.INativeSerializer;
import org.apache.hadoop.mapred.nativetask.serde.NativeSerialization;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* this class will load in and init all platforms on classpath
* it is also the facade to check for key type support and other
* platform methods
*/
@InterfaceAudience.Private
public class Platforms {
private static final Logger LOG = LoggerFactory.getLogger(Platforms.class);
private static final ServiceLoader<Platform> platforms = ServiceLoader.load(Platform.class);
public static void init(Configuration conf) throws IOException {
NativeSerialization.getInstance().reset();
synchronized (platforms) {
for (Platform platform : platforms) {
platform.init();
}
}
}
public static boolean support(String keyClassName,
INativeSerializer<?> serializer, JobConf job) {
synchronized (platforms) {
for (Platform platform : platforms) {
if (platform.support(keyClassName, serializer, job)) {
LOG.debug("platform " + platform.name() + " support key class"
+ keyClassName);
return true;
}
}
}
return false;
}
public static boolean define(Class<?> keyComparator) {
synchronized (platforms) {
for (Platform platform : platforms) {
if (platform.define(keyComparator)) {
LOG.debug("platform " + platform.name() + " define comparator "
+ keyComparator.getName());
return true;
}
}
}
return false;
}
}
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