storm-buildtools/storm-maven-plugins/src/main/java/org/apache/storm/maven/plugin/util/CommandExec.java

/**
 * 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.storm.maven.plugin.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.maven.plugin.Mojo;

public class CommandExec {
    private Mojo mojo;

    public CommandExec(Mojo mojo) {
        this.mojo = mojo;
    }

    public int run(List<String> command, List<String> output) {
        int retCode = 1;
        ProcessBuilder pb = new ProcessBuilder(command);
        try {
            Process p = pb.start();
            OutputBufferThread stdOut = new OutputBufferThread(p.getInputStream());
            OutputBufferThread stdErr = new OutputBufferThread(p.getErrorStream());
            stdOut.start();
            stdErr.start();
            retCode = p.waitFor();
            if (retCode != 0) {
                mojo.getLog().warn(command + " failed with error code " + retCode);
                for (String s : stdErr.getOutput()) {
                    mojo.getLog().debug(s);
                }
            }
            stdOut.join();
            stdErr.join();
            output.addAll(stdOut.getOutput());
        } catch (Exception ex) {
            mojo.getLog().warn(command + " failed: " + ex.toString());
        }
        return retCode;
    }

    private static class OutputBufferThread extends Thread {
        private List<String> output;
        private BufferedReader reader;

        public OutputBufferThread(InputStream is) {
            this.setDaemon(true);
            output = new ArrayList<String>();
            reader = new BufferedReader(new InputStreamReader(is));
        }

        @Override
        public void run() {
            try {
                String line = reader.readLine();
                while (line != null) {
                    output.add(line);
                    line = reader.readLine();
                }
            } catch (IOException ex) {
                throw new RuntimeException("make failed with error code "
                                           + ex.toString());
            }
        }

        public List<String> getOutput() {
            return output;
        }
    }
}