org.jboss.qa.jcontainer.util.executor.ProcessExecutor.java Source code

Introduction

Here is the source code for org.jboss.qa.jcontainer.util.executor.ProcessExecutor.java

Source

/*
 * Copyright 2015 Red Hat Inc. and/or its affiliates and other contributors.
 *
 * 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.jboss.qa.jcontainer.util.executor;

import org.apache.commons.lang.SystemUtils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.Pipe;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.NonNull;
import lombok.Singular;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Builder
public class ProcessExecutor {

    @Singular
    private List<String> commands;
    private OutputStream outputStream;
    private OutputStream errorStream;
    private boolean redirectError;

    private ProcessBuilder processBuilder;

    public int syncExecute() throws IOException, InterruptedException, ExecutionException {
        return asyncExecute().waitFor();
    }

    public Process asyncExecute() throws IOException {
        if (processBuilder == null) {
            processBuilder = new ProcessBuilder(commands);
        }

        if (outputStream == null) {
            if (SystemUtils.IS_OS_HP_UX) {
                outputStream = System.out;
            } else {
                processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
            }
        }
        if (errorStream == null && !redirectError) {
            if (SystemUtils.IS_OS_HP_UX) {
                outputStream = System.err;
            } else {
                processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
            }
        }
        processBuilder.redirectErrorStream(redirectError);

        final Process process = processBuilder.start();

        final ExecutorService executeService = Executors.newCachedThreadPool();
        final List<Future> futures = new ArrayList<>();

        if (outputStream != null) {
            final Pipe pipe = Pipe.open();
            futures.add(executeService
                    .submit(new CopyIntoChannel(Channels.newChannel(process.getInputStream()), pipe.sink())));
            futures.add(
                    executeService.submit(new CopyIntoChannel(pipe.source(), Channels.newChannel(outputStream))));
        }
        if (errorStream != null && !redirectError) {
            final Pipe pipe = Pipe.open();
            futures.add(executeService
                    .submit(new CopyIntoChannel(Channels.newChannel(process.getErrorStream()), pipe.sink())));
            futures.add(
                    executeService.submit(new CopyIntoChannel(pipe.source(), Channels.newChannel(errorStream))));
        }

        final Future<Integer> future = executeService.submit(new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                process.waitFor();
                for (Future f : futures) {
                    f.get();
                }
                return process.exitValue();
            }
        });

        final Process proxyProcess = new ProcessWrapper(process, future);

        executeService.shutdown();
        return proxyProcess;
    }

    @Slf4j
    @AllArgsConstructor
    static class ProcessWrapper extends Process {

        public static final int EXECUTION_ERROR_RETURN_CODE = 500;

        private Process process;
        private Future<Integer> future;

        @Override
        public OutputStream getOutputStream() {
            return process.getOutputStream();
        }

        @Override
        public InputStream getInputStream() {
            return process.getInputStream();
        }

        @Override
        public InputStream getErrorStream() {
            return process.getErrorStream();
        }

        @Override
        public int waitFor() throws InterruptedException {
            try {
                return future.get();
            } catch (ExecutionException e) {
                log.error(e.getMessage(), e);
                return EXECUTION_ERROR_RETURN_CODE;
            }
        }

        @Override
        public int exitValue() {
            return process.exitValue();
        }

        @Override
        public void destroy() {
            process.destroy();
        }
    }

    @Slf4j
    @AllArgsConstructor
    static class CopyIntoChannel implements Runnable {

        @NonNull
        private ReadableByteChannel sourceChannel;
        @NonNull
        private WritableByteChannel sinkChannel;

        @Override
        public void run() {
            final ByteBuffer buf = ByteBuffer.allocate(48);
            try {
                while (sourceChannel.isOpen() && sourceChannel.read(buf) != -1) {
                    buf.flip(); //make buffer ready for read
                    if (!sinkChannel.isOpen()) {
                        return;
                    }
                    sinkChannel.write(buf);
                    buf.clear(); //make buffer ready for writing
                }
            } catch (IOException e) {
                if (e.getMessage().contains("Stream closed")) {
                    log.debug(e.getMessage());
                } else {
                    log.error(e.getMessage(), e);
                }
            } finally {
                if (sinkChannel instanceof Pipe.SinkChannel) {
                    try {
                        sinkChannel.close();
                    } catch (IOException e) {
                        log.error(e.getMessage(), e);
                    }
                }
            }
        }
    }
}