hadoop ExternalCall 源码
haddop ExternalCall 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ExternalCall.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.ipc;
import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.hadoop.ipc.Server.Call;
import org.apache.hadoop.ipc.protobuf.RpcHeaderProtos.RpcResponseHeaderProto.RpcStatusProto;
import org.apache.hadoop.security.UserGroupInformation;
public abstract class ExternalCall<T> extends Call {
private final PrivilegedExceptionAction<T> action;
private final AtomicBoolean done = new AtomicBoolean();
private T result;
private Throwable error;
public ExternalCall(PrivilegedExceptionAction<T> action) {
this.action = action;
}
@Override
public String getDetailedMetricsName() {
return "(external)";
}
public abstract UserGroupInformation getRemoteUser();
public final T get() throws InterruptedException, ExecutionException {
waitForCompletion();
if (error != null) {
throw new ExecutionException(error);
}
return result;
}
// wait for response to be triggered to support postponed calls
private void waitForCompletion() throws InterruptedException {
synchronized(done) {
while (!done.get()) {
try {
done.wait();
} catch (InterruptedException ie) {
if (Thread.interrupted()) {
throw ie;
}
}
}
}
}
boolean isDone() {
return done.get();
}
// invoked by ipc handler
@Override
public final Void run() throws IOException {
try {
result = action.run();
sendResponse();
} catch (Throwable t) {
abortResponse(t);
}
return null;
}
@Override
final void doResponse(Throwable t, RpcStatusProto status) {
synchronized(done) {
error = t;
done.set(true);
done.notify();
}
}
}
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