Examples with DefaultExecuteResultHandler org.apache.commons.exec.DefaultExecuteResultHandler used on opensource projects

Example 16 with DefaultExecuteResultHandler

use of org.apache.commons.exec.DefaultExecuteResultHandler in project smarthome by eclipse.

the class ExecUtil method executeCommandLineAndWaitResponse.

/**
 * <p>
 * Executes <code>commandLine</code>. Sometimes (especially observed on MacOS) the commandLine isn't executed
 * properly. In that cases another exec-method is to be used. To accomplish this please use the special delimiter '
 * <code>@@</code>'. If <code>commandLine</code> contains this delimiter it is split into a String[] array and the
 * special exec-method is used.
 *
 * <p>
 * A possible {@link IOException} gets logged but no further processing is done.
 *
 * @param commandLine the command line to execute
 * @param timeout timeout for execution in milliseconds
 * @return response data from executed command line
 */
public static String executeCommandLineAndWaitResponse(String commandLine, int timeout) {
    String retval = null;
    CommandLine cmdLine = null;
    if (commandLine.contains(CMD_LINE_DELIMITER)) {
        String[] cmdArray = commandLine.split(CMD_LINE_DELIMITER);
        cmdLine = new CommandLine(cmdArray[0]);
        for (int i = 1; i < cmdArray.length; i++) {
            cmdLine.addArgument(cmdArray[i], false);
        }
    } else {
        cmdLine = CommandLine.parse(commandLine);
    }
    DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
    ExecuteWatchdog watchdog = new ExecuteWatchdog(timeout);
    Executor executor = new DefaultExecutor();
    ByteArrayOutputStream stdout = new ByteArrayOutputStream();
    PumpStreamHandler streamHandler = new PumpStreamHandler(stdout);
    executor.setExitValues(null);
    executor.setStreamHandler(streamHandler);
    executor.setWatchdog(watchdog);
    try {
        executor.execute(cmdLine, resultHandler);
        logger.debug("executed commandLine '{}'", commandLine);
    } catch (ExecuteException e) {
        logger.warn("couldn't execute commandLine '{}'", commandLine, e);
    } catch (IOException e) {
        logger.warn("couldn't execute commandLine '{}'", commandLine, e);
    }
    // can safely request the exit code
    try {
        resultHandler.waitFor();
        int exitCode = resultHandler.getExitValue();
        retval = StringUtils.chomp(stdout.toString());
        if (resultHandler.getException() != null) {
            logger.warn("{}", resultHandler.getException().getMessage());
        } else {
            logger.debug("exit code '{}', result '{}'", exitCode, retval);
        }
    } catch (InterruptedException e) {
        logger.warn("Timeout occurred when executing commandLine '{}'", commandLine, e);
    }
    return retval;
}