Package org.apache.tools.ant.taskdefs

Class ExecuteWatchdog

java.lang.Object
org.apache.tools.ant.taskdefs.ExecuteWatchdog
All Implemented Interfaces:
TimeoutObserver
public class ExecuteWatchdog extends Object implements TimeoutObserver
Destroys a process running for too long. For example: 
 ExecuteWatchdog watchdog = new ExecuteWatchdog(30000);
 Execute exec = new Execute(myloghandler, watchdog);
 exec.setCommandLine(mycmdline);
 int exitvalue = exec.execute();
 if (Execute.isFailure(exitvalue) && watchdog.killedProcess()) {
              // it was killed on purpose by the watchdog
 }
Since:
Ant 1.2
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    ExecuteWatchdog(int timeout)
    Deprecated.
    since 1.5.x.
    ExecuteWatchdog(long timeout)
    Creates a new watchdog with a given timeout.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    checkException()
    This method will rethrow the exception that was possibly caught during the run of the process.
    protected void
    cleanUp()
    reset the monitor flag and the process.
    boolean
    isWatching()
    Indicates whether or not the watchdog is still monitoring the process.
    boolean
    killedProcess()
    Indicates whether the last process run was killed on timeout or not.
    void
    start(Process process)
    Watches the given process and terminates it, if it runs for too long.
    void
    stop()
    Stops the watcher.
    void
    timeoutOccured(Watchdog w)
    Called after watchdog has finished.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • ExecuteWatchdog

      public ExecuteWatchdog(long timeout)
      Creates a new watchdog with a given timeout.
      Parameters:
      timeout - the timeout for the process in milliseconds. It must be greater than 0.

    • ExecuteWatchdog

      @Deprecated public ExecuteWatchdog(int timeout)
      Deprecated.
      since 1.5.x. Use constructor with a long type instead. (1.4.x compatibility)
      Parameters:
      timeout - the timeout value to use in milliseconds.
      See Also:

  • Method Details

    • start

      public void start(Process process)
      Watches the given process and terminates it, if it runs for too long. All information from the previous run are reset.
      Parameters:
      process - the process to monitor. It cannot be null
      Throws:
      IllegalStateException - if a process is still being monitored.

    • stop

      public void stop()
      Stops the watcher. It will notify all threads possibly waiting on this object.

    • timeoutOccured

      public void timeoutOccured(Watchdog w)
      Called after watchdog has finished. This can be called in the watchdog thread
      Specified by:
      timeoutOccured in interface TimeoutObserver
      Parameters:
      w - the watchdog

    • cleanUp

      protected void cleanUp()
      reset the monitor flag and the process.

    • checkException

      public void checkException() throws BuildException
      This method will rethrow the exception that was possibly caught during the run of the process. It will only remains valid once the process has been terminated either by 'error', timeout or manual intervention. Information will be discarded once a new process is ran.
      Throws:
      BuildException - a wrapped exception over the one that was silently swallowed and stored during the process run.

    • isWatching

      public boolean isWatching()
      Indicates whether or not the watchdog is still monitoring the process.
      Returns:
      true if the process is still running, otherwise false.

    • killedProcess

      public boolean killedProcess()
      Indicates whether the last process run was killed on timeout or not.
      Returns:
      true if the process was killed otherwise false.