| /* |
| * 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.geronimo.gshell.io; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| // |
| // Based on Apache Ant 1.6.5 |
| // |
| |
| /** |
| * Copies standard output and error of children streams to standard output and error of the parent. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class PumpStreamHandler |
| { |
| private InputStream in; |
| |
| private OutputStream out; |
| |
| private OutputStream err; |
| |
| private Thread outputThread; |
| |
| private Thread errorThread; |
| |
| private StreamPumper inputPump; |
| |
| // |
| // NOTE: May want to use a ThreadPool here, 3 threads per/pair seems kinda expensive :-( |
| // |
| |
| public PumpStreamHandler(final InputStream in, final OutputStream out, final OutputStream err) { |
| assert in != null; |
| assert out != null; |
| assert err != null; |
| |
| this.in = in; |
| this.out = out; |
| this.err = err; |
| } |
| |
| public PumpStreamHandler(final OutputStream out, final OutputStream err) { |
| this(null, out, err); |
| } |
| |
| public PumpStreamHandler(final OutputStream outAndErr) { |
| this(outAndErr, outAndErr); |
| } |
| |
| /** |
| * Set the input stream from which to read the standard output of the child. |
| */ |
| public void setChildOutputStream(final InputStream in) { |
| assert in != null; |
| |
| createChildOutputPump(in, out); |
| } |
| |
| /** |
| * Set the input stream from which to read the standard error of the child. |
| */ |
| public void setChildErrorStream(final InputStream in) { |
| assert in != null; |
| |
| if (err != null) { |
| createChildErrorPump(in, err); |
| } |
| } |
| |
| /** |
| * Set the output stream by means of which input can be sent to the child. |
| */ |
| public void setChildInputStream(final OutputStream out) { |
| assert out != null; |
| |
| if (in != null) { |
| inputPump = createInputPump(in, out, true); |
| } |
| else { |
| Closer.close(out); |
| } |
| } |
| |
| /** |
| * Attach to a child streams from the given process. |
| * |
| * @param p The process to attach to. |
| */ |
| public void attach(final Process p) { |
| assert p != null; |
| |
| setChildInputStream(p.getOutputStream()); |
| setChildOutputStream(p.getInputStream()); |
| setChildErrorStream(p.getErrorStream()); |
| } |
| /** |
| * Start pumping the streams. |
| */ |
| public void start() { |
| if (outputThread != null) { |
| outputThread.start(); |
| } |
| |
| if (errorThread != null) { |
| errorThread.start(); |
| } |
| |
| if (inputPump != null) { |
| Thread inputThread = new Thread(inputPump); |
| inputThread.setDaemon(true); |
| inputThread.start(); |
| } |
| } |
| |
| /** |
| * Stop pumping the streams. |
| */ |
| public void stop() { |
| if (outputThread != null) { |
| try { |
| outputThread.join(); |
| } |
| catch (InterruptedException e) { |
| // ignore |
| } |
| } |
| |
| if (errorThread != null) { |
| try { |
| errorThread.join(); |
| } |
| catch (InterruptedException e) { |
| // ignore |
| } |
| } |
| |
| if (inputPump != null) { |
| inputPump.stop(); |
| } |
| |
| Flusher.flush(err, out); |
| } |
| |
| /** |
| * Create the pump to handle child output. |
| */ |
| protected void createChildOutputPump(final InputStream in, final OutputStream out) { |
| assert in != null; |
| assert out != null; |
| |
| outputThread = createPump(in, out); |
| } |
| |
| /** |
| * Create the pump to handle error output. |
| */ |
| protected void createChildErrorPump(final InputStream in, final OutputStream out) { |
| assert in != null; |
| assert out != null; |
| |
| errorThread = createPump(in, out); |
| } |
| |
| /** |
| * Creates a stream pumper to copy the given input stream to the given output stream. |
| */ |
| protected Thread createPump(final InputStream in, final OutputStream out) { |
| assert in != null; |
| assert out != null; |
| |
| return createPump(in, out, false); |
| } |
| |
| /** |
| * Creates a stream pumper to copy the given input stream to the |
| * given output stream. |
| * |
| * @param in The input stream to copy from. |
| * @param out The output stream to copy to. |
| * @param closeWhenExhausted If true close the inputstream. |
| * @return A thread object that does the pumping. |
| */ |
| protected Thread createPump(final InputStream in, final OutputStream out, final boolean closeWhenExhausted) { |
| assert in != null; |
| assert out != null; |
| |
| final Thread result = new Thread(new StreamPumper(in, out, closeWhenExhausted)); |
| result.setDaemon(true); |
| return result; |
| } |
| |
| /** |
| * Creates a stream pumper to copy the given input stream to the |
| * given output stream. Used for standard input. |
| */ |
| protected StreamPumper createInputPump(final InputStream in, final OutputStream out, final boolean closeWhenExhausted) { |
| assert in != null; |
| assert out != null; |
| |
| StreamPumper pumper = new StreamPumper(in, out, closeWhenExhausted); |
| pumper.setAutoflush(true); |
| return pumper; |
| } |
| } |