hadoop JAXBContextResolver 源码
haddop JAXBContextResolver 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/webapp/JAXBContextResolver.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.server.applicationhistoryservice.webapp;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;
import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptsInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppInfo;
import org.apache.hadoop.yarn.server.webapp.dao.AppsInfo;
import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo;
import org.apache.hadoop.yarn.server.webapp.dao.ContainersInfo;
import com.google.inject.Singleton;
import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;
@Singleton
@Provider
@SuppressWarnings("rawtypes")
public class JAXBContextResolver implements ContextResolver<JAXBContext> {
private JAXBContext context;
private final Set<Class> types;
// you have to specify all the dao classes here
private final Class[] cTypes = { AppInfo.class, AppsInfo.class,
AppAttemptInfo.class, AppAttemptsInfo.class, ContainerInfo.class,
ContainersInfo.class };
public JAXBContextResolver() throws Exception {
this.types = new HashSet<Class>(Arrays.asList(cTypes));
this.context =
new JSONJAXBContext(JSONConfiguration.natural().rootUnwrapping(false)
.build(), cTypes);
}
@Override
public JAXBContext getContext(Class<?> objectType) {
return (types.contains(objectType)) ? context : null;
}
}
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