org.elasticsearch.hadoop.mr.compat.CompatHandler Maven / Gradle / Ivy
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* 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.elasticsearch.hadoop.mr.compat;
import java.lang.reflect.Proxy;
/**
* Handler for the binary breakage between Hadoop 1 and Hadoop 2.
*/
public class CompatHandler {
public static Counter counter(org.apache.hadoop.mapreduce.Counter target) {
return proxy(target, Counter.class);
}
public static CounterGroup counterGroup(org.apache.hadoop.mapreduce.CounterGroup target) {
return proxy(target, CounterGroup.class);
}
public static JobContext jobContext(org.apache.hadoop.mapreduce.JobContext target) {
return proxy(target, JobContext.class);
}
public static MapContext mapContext(org.apache.hadoop.mapreduce.MapContext target) {
return proxy(target, MapContext.class);
}
public static ReduceContext reduceContext(org.apache.hadoop.mapreduce.ReduceContext target) {
return proxy(target, ReduceContext.class);
}
public static TaskAttemptContext taskAttemptContext(org.apache.hadoop.mapreduce.TaskAttemptContext target) {
return proxy(target, TaskAttemptContext.class);
}
public static TaskInputOutputContext taskInputOutputContext(org.apache.hadoop.mapreduce.TaskInputOutputContext target) {
return proxy(target, TaskInputOutputContext.class);
}
@SuppressWarnings("unchecked")
private static P proxy(T target, Class proxy) {
return (P) Proxy.newProxyInstance(proxy.getClassLoader(), new Class[] { CompatProxy.class, proxy }, new ReflectiveInvoker(target));
}
public static Object unwrap(Object object) {
if (object instanceof CompatProxy) {
return ((ReflectiveInvoker) Proxy.getInvocationHandler(object)).target();
}
return object;
}
}