Executor.java

package org.jabox.scm.git;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.concurrent.TimeoutException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Executor is a wrapper for system executions.
 * 
 * @author dimitris
 */
public class Executor {
    private static final Logger LOGGER = LoggerFactory
        .getLogger(Executor.class);

    /**
     * Execution wrapper.
     * 
     * @param command
     * @param envp
     * @param dir
     */
    public static void exec(final String command, final String[] envp,
            final File dir) {
        LOGGER.info("[" + dir.getAbsolutePath() + "] Executing: "
            + command);

        try {
            Process p = Runtime.getRuntime().exec(command, envp, dir);
            InputStream in = p.getInputStream();

            InputStream err = p.getErrorStream();
            BufferedReader bIn =
                new BufferedReader(new InputStreamReader(in));
            BufferedReader bErr =
                new BufferedReader(new InputStreamReader(err));
            String line;
            while ((line = bErr.readLine()) != null) {
                LOGGER.info(line);
            }

            while ((line = bIn.readLine()) != null) {
                LOGGER.info(line);
            }
            p.waitFor(); /* wait for subprocess to terminate */
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static int exec(final String command, final String[] envp,
            final File dir, final boolean printOutput,
            final boolean printError, final long timeout)
            throws IOException, InterruptedException, TimeoutException {
        LOGGER.info("[" + dir.getAbsolutePath() + "] Executing: "
            + command);

        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec(command, envp, dir);
        /* Set up process I/O. */
        Worker worker = new Worker(process);
        worker.start();
        try {
            worker.join(timeout);
            if (worker.exit != null) {
                return worker.exit;
            } else {
                throw new TimeoutException();
            }
        } catch (InterruptedException ex) {
            worker.interrupt();
            Thread.currentThread().interrupt();
            throw ex;
        } finally {
            process.destroy();
        }
    }

}