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## commonj.timers
Interface Timer

    public interface Timer

A Timer is returned when a TimerListener is scheduled using one of the `TimerManager.schedule` methods. It allows retrieving information about the scheduled TimerListener and allows cancelling it.

Timers are transient and not transactional and run inside the JVM which created them. If a cluster-wide scheduled event is required or it needs to be persistent, transactional or recoverable then a service such as the EJB 2.1 Timer service should be used instead.

Since:
  1.0
See Also:
  `Timer`, `TimerListener`

Method Summary
`boolean` | `cancel()` This cancels the timer and all future TimerListener invocations and may be called during the `TimerListener.timerExpired` method.
`long` | `getPeriod()` Return the period used to compute the time this timer will repeat.
`long` | `getScheduledExecutionTime()` Returns the next absolute scheduled execution time in milliseconds.
`TimerListener` | `getTimerListener()` Returns the application-supplied TimerListener associated with this Timer.

Method Detail

### cancel

    boolean cancel()

  This cancels the timer and all future TimerListener invocations and may be called during the `TimerListener.timerExpired` method.

  `CancelTimerListener.timerCancel` events may be called concurrently with any `TimerListener.timerExpired` methods. Proper thread synchronization techiniques must be employed to ensure consistency. Once a Timer is cancelled an application must not use the Timer instance again.

  Returns:
    true if this prevented the next execution of this timer. False if this was already cancelled or had already expired in the one shot case.
  Since:
    1.0
  See Also:
    `CancelTimerListener`

### getTimerListener

    TimerListener getTimerListener()

  Returns the application-supplied TimerListener associated with this Timer.

  Returns:
    The TimerListener associated with the timer.
  Throws:
    `IllegalStateException` - if the TimerManager has been stopped.
  Since:
    1.0

### getScheduledExecutionTime

    long getScheduledExecutionTime()
                                   throws IllegalStateException

  Returns the next absolute scheduled execution time in milliseconds.

  If invoked while a TimerListener is running, the return value is the scheduled execution time of the current TimerListener execution.

  This method is typically invoked from within a TimerListener's timerExpired method, to determine whether the current execution of the task is sufficiently timely to warrant performing the scheduled activity:

          public void timerExpired(Timer t) {
              if (System.currentTimeMillis() - t.scheduledExecutionTime() >=
                  MAX_TARDINESS)
                      return;  // Too late; skip this execution.
              // Perform the task
          }

  If the timer has been suspended, the time reflects the most recently-calculated execution time prior to being suspended.

  Returns:
    the time in milliseconds at which the TimerListener is scheduled to run next.
  Throws:
    `IllegalStateException` - if the TimerManager has been stopped.
  Since:
    1.1

### getPeriod

    long getPeriod()

  Return the period used to compute the time this timer will repeat. A value of zero indicates that the timer is non-repeating.

  Returns:
    the period in milliseconds between timer executions.
  Since:
    1.0

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