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## java.awt.event
Class InvocationEvent

    java.lang.Object
      |
      +--java.util.EventObject
            |
            +--java.awt.AWTEvent
                  |
                  +--java.awt.event.InvocationEvent

All Implemented Interfaces:
  ActiveEvent, Serializable

public class InvocationEvent
extends AWTEvent
implements ActiveEvent

An event which executes the `run()` method on a `Runnable` when dispatched by the AWT event dispatcher thread. This class can be used as a reference implementation of `ActiveEvent` rather than declaring a new class and defining `dispatch()`.

Instances of this class are placed on the `EventQueue` by calls to `invokeLater` and `invokeAndWait`. Client code can use this fact to write replacement functions for `invokeLater` and `invokeAndWait` without writing special-case code in any `AWTEventListener` objects.

Since:
  1.2
See Also:
  `ActiveEvent`, `EventQueue.invokeLater(java.lang.Runnable)`, `EventQueue.invokeAndWait(java.lang.Runnable)`, `AWTEventListener`, Serialized Form

Field Summary
`protected boolean` | `catchExceptions` Set to true if dispatch() catches Exception and stores it in the exception instance variable.
`static int` | `INVOCATION_DEFAULT` The default id for all InvocationEvents.
`static int` | `INVOCATION_FIRST` Marks the first integer id for the range of invocation event ids.
`static int` | `INVOCATION_LAST` Marks the last integer id for the range of invocation event ids.
`protected Object` | `notifier` The (potentially null) Object whose notifyAll() method will be called immediately after the Runnable.run() method returns.
`protected Runnable` | `runnable` The Runnable whose run() method will be called.

Fields inherited from class java.awt.AWTEvent
`ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK`

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`protected` | `InvocationEvent(Object source, int id, Runnable runnable, Object notifier, boolean catchExceptions)` Constructs an `InvocationEvent` with the specified source and ID which will execute the runnable's `run` method when dispatched.
`` | `InvocationEvent(Object source, Runnable runnable)` Constructs an `InvocationEvent` with the specified source which will execute the runnable's `run` method when dispatched.
`` | `InvocationEvent(Object source, Runnable runnable, Object notifier, boolean catchExceptions)` Constructs an `InvocationEvent` with the specified source which will execute the runnable's `run` method when dispatched.

Method Summary
`void` | `dispatch()` Executes the Runnable's `run()` method and notifies the notifier (if any) when `run()` returns.
`Exception` | `getException()` Returns any Exception caught while executing the Runnable's `run()` method.
`long` | `getWhen()` Returns the timestamp of when this event occurred.
`String` | `paramString()` Returns a parameter string identifying this event.

Methods inherited from class java.awt.AWTEvent
`consume, getID, isConsumed, setSource, toString`

Methods inherited from class java.util.EventObject
`getSource`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### INVOCATION_FIRST

    public static final int INVOCATION_FIRST

  Marks the first integer id for the range of invocation event ids.

  See Also:
    Constant Field Values

### INVOCATION_DEFAULT

    public static final int INVOCATION_DEFAULT

  The default id for all InvocationEvents.

  See Also:
    Constant Field Values

### INVOCATION_LAST

    public static final int INVOCATION_LAST

  Marks the last integer id for the range of invocation event ids.

  See Also:
    Constant Field Values

### runnable

    protected Runnable runnable

  The Runnable whose run() method will be called.

### notifier

    protected Object notifier

  The (potentially null) Object whose notifyAll() method will be called immediately after the Runnable.run() method returns.

### catchExceptions

    protected boolean catchExceptions

  Set to true if dispatch() catches Exception and stores it in the exception instance variable. If false, Exceptions are propagated up to the EventDispatchThread's dispatch loop.

Constructor Detail

### InvocationEvent

    public InvocationEvent(Object source,
                           Runnable runnable)

  Constructs an `InvocationEvent` with the specified source which will execute the runnable's `run` method when dispatched.

Parameters:
  `source` - the `Object` that originated the event
  `runnable` - the `Runnable` whose `run` method will be executed

### InvocationEvent

    public InvocationEvent(Object source,
                           Runnable runnable,
                           Object notifier,
                           boolean catchExceptions)

  Constructs an `InvocationEvent` with the specified source which will execute the runnable's `run` method when dispatched. If notifier is non-`null`, `notifyAll()` will be called on it immediately after `run` returns.

Parameters:
  `source` - the `Object` that originated the event
  `runnable` - the `Runnable` whose `run` method will be executed
  `notifier` - the Object whose `notifyAll` method will be called after `Runnable.run` has returned
  `catchExceptions` - specifies whether `dispatch` should catch Exception when executing the `Runnable`'s `run` method, or should instead propagate those Exceptions to the EventDispatchThread's dispatch loop

### InvocationEvent

    protected InvocationEvent(Object source,
                              int id,
                              Runnable runnable,
                              Object notifier,
                              boolean catchExceptions)

  Constructs an `InvocationEvent` with the specified source and ID which will execute the runnable's `run` method when dispatched. If notifier is non-`null`, `notifyAll` will be called on it immediately after `run` returns.

  Note that passing in an invalid `id` results in unspecified behavior.

Parameters:
  `source` - the `Object` that originated the event
  `id` - the ID for the event
  `runnable` - the `Runnable` whose `run` method will be executed
  `notifier` - the `Object whose `notifyAll` method will be called after `Runnable.run` has returned`
  `catchExceptions` - specifies whether `dispatch` should catch Exception when executing the `Runnable`'s `run` method, or should instead propagate those Exceptions to the EventDispatchThread's dispatch loop

Method Detail

### dispatch

    public void dispatch()

  Executes the Runnable's `run()` method and notifies the notifier (if any) when `run()` returns.

  Specified by:
    `dispatch` in interface `ActiveEvent`

### getException

    public Exception getException()

  Returns any Exception caught while executing the Runnable's `run()` method.

  Returns:
    A reference to the Exception if one was thrown; null if no Exception was thrown or if this InvocationEvent does not catch exceptions

### getWhen

    public long getWhen()

  Returns the timestamp of when this event occurred.

  Returns:
    this event's timestamp
  Since:
    1.4

### paramString

    public String paramString()

  Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

  Overrides:
    `paramString` in class `AWTEvent`
  Returns:
    A string identifying the event and its attributes

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.