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/*
* 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.tuscany.sca.runtime.standalone.smoketest;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* Stream drainer used for draining the out and err streams of an external
* process to avoid buffer overflow and deadlock.
*
* @version $Revision$ $Date$
*
*/
public class ProcessDrainer {
// Default time out in seconds
private static final int DEFAULT_TIMEOUT = 60;
// Process whose streams are being drained
private Process process;
// Timeout to wait for the extrenal process to whutdown
private int timeout = DEFAULT_TIMEOUT;
// Executor that is scheduling the draining
private ExecutorService executor = Executors.newFixedThreadPool(2);
/*
* Initializes the process to drained.
*/
private ProcessDrainer(Process process) {
this.process = process;
}
/*
* Initializes the process to drained.
*/
private ProcessDrainer(Process process, int timeout) {
this.process = process;
this.timeout = timeout;
}
/**
* Creates a new instance of the stream drainer for the processed.
* @param process Process to be drained.
* @return An instance of the stream drainer.
*/
public static ProcessDrainer newInstance(Process process) {
return new ProcessDrainer(process);
}
/**
* Creates a new instance of the stream drainer for the processed.
* @param process Process to be drained.
* @param timeout Timeout before which teh drainer stops.
* @return An instance of the stream drainer.
*/
public static ProcessDrainer newInstance(Process process, int timeout) {
return new ProcessDrainer(process, timeout);
}
/**
* Starts draining the stream.
*/
public void drain() {
executor.execute(new StreamDrainer(process.getErrorStream()));
executor.execute(new StreamDrainer(process.getInputStream()));
executor.shutdown();
try {
executor.awaitTermination(timeout, TimeUnit.SECONDS);
} catch (InterruptedException ex) {
return;
}
}
/*
* Scheduled stream drainer.
*/
private class StreamDrainer implements Runnable {
// Stream to be drained
private final InputStream inputStream;
/*
* Initializes the stream to drained.
*/
private StreamDrainer(InputStream inputStream) {
this.inputStream = inputStream;
}
/*
* Starts draing the stream.
*/
public void run() {
try {
int count = 0;
byte[] buffer = new byte[4096];
count = inputStream.read(buffer);
while (count != -1) {
count = inputStream.read(buffer);
}
} catch (IOException ex) {
}
}
}
}
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