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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.spark.launcher;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.concurrent.ThreadFactory;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Redirects lines read from a given input stream to a j.u.l.Logger (at INFO level).
*/
class OutputRedirector {
private final BufferedReader reader;
private final Logger sink;
private final Thread thread;
private volatile boolean active;
OutputRedirector(InputStream in, ThreadFactory tf) {
this(in, OutputRedirector.class.getName(), tf);
}
OutputRedirector(InputStream in, String loggerName, ThreadFactory tf) {
this.active = true;
this.reader = new BufferedReader(new InputStreamReader(in));
this.thread = tf.newThread(new Runnable() {
@Override
public void run() {
redirect();
}
});
this.sink = Logger.getLogger(loggerName);
thread.start();
}
private void redirect() {
try {
String line;
while ((line = reader.readLine()) != null) {
if (active) {
sink.info(line.replaceFirst("\\s*$", ""));
}
}
} catch (IOException e) {
sink.log(Level.FINE, "Error reading child process output.", e);
}
}
/**
* This method just stops the output of the process from showing up in the local logs.
* The child's output will still be read (and, thus, the redirect thread will still be
* alive) to avoid the child process hanging because of lack of output buffer.
*/
void stop() {
active = false;
}
}
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