org.springframework.scheduling.commonj

## Class ScheduledTimerListener

- java.lang.Object
- - org.springframework.scheduling.commonj.ScheduledTimerListener

-     public class ScheduledTimerListener
      extends Object

  JavaBean that describes a scheduled TimerListener, consisting of the TimerListener itself (or a Runnable to create a TimerListener for) and a delay plus period. Period needs to be specified; there is no point in a default for it.

  The CommonJ TimerManager does not offer more sophisticated scheduling options such as cron expressions. Consider using Quartz for such advanced needs.

  Note that the TimerManager uses a TimerListener instance that is shared between repeated executions, in contrast to Quartz which instantiates a new Job for each execution.

  Since:
    2.0
  Author:
    Juergen Hoeller
  See Also:
    `TimerListener`, `TimerManager.schedule(commonj.timers.TimerListener, long, long)`, `TimerManager.scheduleAtFixedRate(commonj.timers.TimerListener, long, long)`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ScheduledTimerListener()` Create a new ScheduledTimerListener, to be populated via bean properties.
    `ScheduledTimerListener(Runnable timerTask)` Create a new ScheduledTimerListener, with default one-time execution without delay.
    `ScheduledTimerListener(Runnable timerTask, long delay)` Create a new ScheduledTimerListener, with default one-time execution with the given delay.
    `ScheduledTimerListener(Runnable timerTask, long delay, long period, boolean fixedRate)` Create a new ScheduledTimerListener.
    `ScheduledTimerListener(TimerListener timerListener)` Create a new ScheduledTimerListener, with default one-time execution without delay.
    `ScheduledTimerListener(TimerListener timerListener, long delay)` Create a new ScheduledTimerListener, with default one-time execution with the given delay.
    `ScheduledTimerListener(TimerListener timerListener, long delay, long period, boolean fixedRate)` Create a new ScheduledTimerListener.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `long` | `getDelay()` Return the delay before starting the job for the first time.
    `long` | `getPeriod()` Return the period between repeated task executions.
    `TimerListener` | `getTimerListener()` Return the TimerListener to schedule.
    `boolean` | `isFixedRate()` Return whether to schedule as fixed-rate execution.
    `boolean` | `isOneTimeTask()` Is this task only ever going to execute once?
    `void` | `setDelay(long delay)` Set the delay before starting the task for the first time, in milliseconds.
    `void` | `setFixedRate(boolean fixedRate)` Set whether to schedule as fixed-rate execution, rather than fixed-delay execution.
    `void` | `setPeriod(long period)` Set the period between repeated task executions, in milliseconds.
    `void` | `setRunnable(Runnable timerTask)` Set the Runnable to schedule as TimerListener.
    `void` | `setTimerListener(TimerListener timerListener)` Set the TimerListener to schedule.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### ScheduledTimerListener

          public ScheduledTimerListener()

      Create a new ScheduledTimerListener, to be populated via bean properties.
      See Also:
        `setTimerListener(commonj.timers.TimerListener)`, `setDelay(long)`, `setPeriod(long)`, `setFixedRate(boolean)`

    - #### ScheduledTimerListener

          public ScheduledTimerListener(TimerListener timerListener)

      Create a new ScheduledTimerListener, with default one-time execution without delay.
      Parameters:
        `timerListener` - the TimerListener to schedule

    - #### ScheduledTimerListener

          public ScheduledTimerListener(TimerListener timerListener,
                                long delay)

      Create a new ScheduledTimerListener, with default one-time execution with the given delay.
      Parameters:
        `timerListener` - the TimerListener to schedule
        `delay` - the delay before starting the task for the first time (ms)

    - #### ScheduledTimerListener

          public ScheduledTimerListener(TimerListener timerListener,
                                long delay,
                                long period,
                                boolean fixedRate)

      Create a new ScheduledTimerListener.
      Parameters:
        `timerListener` - the TimerListener to schedule
        `delay` - the delay before starting the task for the first time (ms)
        `period` - the period between repeated task executions (ms)
        `fixedRate` - whether to schedule as fixed-rate execution

    - #### ScheduledTimerListener

          public ScheduledTimerListener(Runnable timerTask)

      Create a new ScheduledTimerListener, with default one-time execution without delay.
      Parameters:
        `timerTask` - the Runnable to schedule as TimerListener

    - #### ScheduledTimerListener

          public ScheduledTimerListener(Runnable timerTask,
                                long delay)

      Create a new ScheduledTimerListener, with default one-time execution with the given delay.
      Parameters:
        `timerTask` - the Runnable to schedule as TimerListener
        `delay` - the delay before starting the task for the first time (ms)

    - #### ScheduledTimerListener

          public ScheduledTimerListener(Runnable timerTask,
                                long delay,
                                long period,
                                boolean fixedRate)

      Create a new ScheduledTimerListener.
      Parameters:
        `timerTask` - the Runnable to schedule as TimerListener
        `delay` - the delay before starting the task for the first time (ms)
        `period` - the period between repeated task executions (ms)
        `fixedRate` - whether to schedule as fixed-rate execution

  - ### Method Detail

    - #### setRunnable

          public void setRunnable(Runnable timerTask)

      Set the Runnable to schedule as TimerListener.
      See Also:
        `DelegatingTimerListener`

    - #### setTimerListener

          public void setTimerListener(TimerListener timerListener)

      Set the TimerListener to schedule.

    - #### getTimerListener

          public TimerListener getTimerListener()

      Return the TimerListener to schedule.

    - #### setDelay

          public void setDelay(long delay)

      Set the delay before starting the task for the first time, in milliseconds. Default is 0, immediately starting the task after successful scheduling.

      If the "firstTime" property is specified, this property will be ignored. Specify one or the other, not both.

    - #### getDelay

          public long getDelay()

      Return the delay before starting the job for the first time.

    - #### setPeriod

          public void setPeriod(long period)

      Set the period between repeated task executions, in milliseconds.

      Default is -1, leading to one-time execution. In case of zero or a positive value, the task will be executed repeatedly, with the given interval inbetween executions.

      Note that the semantics of the period value vary between fixed-rate and fixed-delay execution.

      Note: A period of 0 (for example as fixed delay) is supported, because the CommonJ specification defines this as a legal value. Hence a value of 0 will result in immediate re-execution after a job has finished (not in one-time execution like with `java.util.Timer`).

      See Also:
        `setFixedRate(boolean)`, `isOneTimeTask()`, `TimerManager.schedule(commonj.timers.TimerListener, long, long)`

    - #### getPeriod

          public long getPeriod()

      Return the period between repeated task executions.

    - #### isOneTimeTask

          public boolean isOneTimeTask()

      Is this task only ever going to execute once?
      Returns:
        `true` if this task is only ever going to execute once
      See Also:
        `getPeriod()`

    - #### setFixedRate

          public void setFixedRate(boolean fixedRate)

      Set whether to schedule as fixed-rate execution, rather than fixed-delay execution. Default is "false", i.e. fixed delay.

      See TimerManager javadoc for details on those execution modes.

      See Also:
        `TimerManager.schedule(commonj.timers.TimerListener, long, long)`, `TimerManager.scheduleAtFixedRate(commonj.timers.TimerListener, long, long)`

    - #### isFixedRate

          public boolean isFixedRate()

      Return whether to schedule as fixed-rate execution.