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InvocationEvent (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.awt.event
Class InvocationEvent

java.lang.Object
  extended by java.util.EventObject
      extended by java.awt.AWTEvent
          extended by 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 Throwable 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 catchThrowables)
          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 catchThrowables)
          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.
 Throwable getThrowable()
          Returns any Throwable 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 Throwable and stores it in the exception instance variable. If false, Throwables 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.

This is a convenience constructor. An invocation of the form InvocationEvent(source, runnable) behaves in exactly the same way as the invocation of InvocationEvent(source, runnable, null, false).

This method throws an IllegalArgumentException if source is null.

Parameters:
source - the Object that originated the event
runnable - the Runnable whose run method will be executed
Throws:
IllegalArgumentException - if source is null
See Also:
InvocationEvent(Object, Runnable, Object, boolean)

InvocationEvent

public InvocationEvent(Object source,
                       Runnable runnable,
                       Object notifier,
                       boolean catchThrowables)
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.

An invocation of the form InvocationEvent(source, runnable, notifier, catchThrowables) behaves in exactly the same way as the invocation of InvocationEvent(source, InvocationEvent.INVOCATION_DEFAULT, runnable, notifier, catchThrowables).

This method throws an IllegalArgumentException if source is null.

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
catchThrowables - specifies whether dispatch should catch Throwable when executing the Runnable's run method, or should instead propagate those Throwables to the EventDispatchThread's dispatch loop
Throws:
IllegalArgumentException - if source is null
See Also:
InvocationEvent(Object, int, Runnable, Object, boolean)

InvocationEvent

protected InvocationEvent(Object source,
                          int id,
                          Runnable runnable,
                          Object notifier,
                          boolean catchThrowables)
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. This method throws an IllegalArgumentException if source is null.

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
catchThrowables - specifies whether dispatch should catch Throwable when executing the Runnable's run method, or should instead propagate those Throwables to the EventDispatchThread's dispatch loop
Throws:
IllegalArgumentException - if source is null
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

getThrowable

public Throwable getThrowable()
Returns any Throwable caught while executing the Runnable's run() method.

Returns:
A reference to the Throwable if one was thrown; null if no Throwable was thrown or if this InvocationEvent does not catch Throwables
Since:
1.5

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 SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.