org.globus.io.gass.server.JobOutputStream Maven / Gradle / Ivy
/*
* Copyright 1999-2006 University of Chicago
*
* Licensed 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.globus.io.gass.server;
import java.io.OutputStream;
import java.io.IOException;
/**
* This is a small class that allows to redirect
* a job's output to a custom job output listener.
* That is, a listener that presents/displays the
* job output in a specific way. For example, this
* class can be used to redirect a job's output
* to a window.
*
* This class is specificaly designed for jobs
* that generate textual output. Binary data
* might not be handled correctly.
*/
public class JobOutputStream extends OutputStream {
protected JobOutputListener listener;
/**
* Creates a job output stream with a specific
* job output listener to which the job output
* will be redirected to.
*
* @param jobListener an instance of the job output
* listener. Cannot be null.
*/
public JobOutputStream(JobOutputListener jobListener) {
if (jobListener == null) {
throw new IllegalArgumentException("jobListener cannot be null");
}
listener = jobListener;
}
/**
* Converts the byte array to a string and forwards
* it to the job output listener.
*
Called by the GassServer.
*/
public void write(byte[] b, int off, int len)
throws IOException {
String s = new String(b, off, len);
listener.outputChanged(s);
}
/**
* Converts the int to a string and forwards
* it to the job output listener.
*
Called by the GassServer.
*/
public void write(int b)
throws IOException {
listener.outputChanged(String.valueOf(b));
}
/**
* Notifies the job output listener that
* no more output will be produced.
*
Called by the GassServer.
*/
public void close()
throws IOException {
listener.outputClosed();
}
}