de.mklinger.commons.exec.PipeRunnable.java Source code

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Here is the source code for de.mklinger.commons.exec.PipeRunnable.java

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/*
 * Copyright 2013-present mklinger GmbH - http://www.mklinger.de
 *
 * 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 de.mklinger.commons.exec;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Marc Klinger - mklinger[at]mklinger[dot]de
 */
public class PipeRunnable extends ErrorHandlingRunnable {
    private static final Logger LOG = LoggerFactory.getLogger(PipeRunnable.class);
    private final OutputStream out;
    private final InputStream in;
    private final AtomicBoolean running = new AtomicBoolean();
    private final AtomicBoolean started = new AtomicBoolean();

    public PipeRunnable(final InputStream in, final OutputStream out) {
        this.in = in;
        this.out = out;
    }

    @Override
    protected void doRun() throws IOException {
        running.set(true);
        started.set(true);
        try {
            final int copied = IOUtils.copy(in, out);
            LOG.debug("Copied {} bytes", copied);
        } finally {
            running.set(false);
        }
    }

    public boolean isRunning() {
        return running.get();
    }

    public void waitForStart(final long timeoutMillis) throws CommandLineException {
        final long start = System.currentTimeMillis();
        while (!started.get()) {
            if (start + timeoutMillis < System.currentTimeMillis()) {
                throw new CommandLineException("Timout waiting for pipe to start after " + timeoutMillis + " ms");
            }
            Thread.yield();
        }
    }

    public void waitForStop(final long timeoutMillis) throws CommandLineException, InterruptedException {
        final long start = System.currentTimeMillis();
        while (isRunning()) {
            if (start + timeoutMillis < System.currentTimeMillis()) {
                throw new CommandLineException("Timout waiting for pipe to stop after " + timeoutMillis + " ms");
            }
            Thread.sleep(1);
        }
    }
}