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Java Source Code / Java Documentation » Ajax » GWT » com.google.gwt.user.client 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.google.gwt.user.client.CommandExecutor

CommandExecutor
class CommandExecutor (Code)
Class which executes Command s and IncrementalCommand s after all currently pending event handlers have completed. This class attempts to protect against slow script warnings by running commands in small time increments.

It is still possible that a poorly written command could cause a slow script warning which a user may choose to cancel. In that event, a CommandCanceledException or an IncrementalCommandCanceledException is reported through the current UncaughtExceptionHandler depending on the type of command which caused the warning. All other commands will continue to be executed.

TODO(mmendez): Can an SSW be detected without using a timer? Currently, if a Command or an IncrementalCommand calls either Window.alert(String) or the JavaScript alert(String) methods directly or indirectly then the CommandExecutor.cancellationTimer can fire, resulting in a false SSW cancellation detection.




Method Summary
protected  voiddoCommandCanceled()
     Reports either a CommandCanceledException or an IncrementalCommandCanceledException back through the UncaughtExceptionHandler if one is set.
protected  voiddoExecuteCommands(long startTimeMillis)
     This method will dispatch commands from the command queue.
 List<Object>getPendingCommands()
     This method is for testing only.
protected  voidmaybeStartExecutionTimer()
     Starts the dispatch timer if there are commands to dispatch and we are not waiting for a dispatch timer and we are not actively dispatching.
 voidsetExecuting(boolean executing)
     This method is for testing only.
 voidsetLast(int last)
     This method is for testing only.
public  voidsubmit(Command command)
     Submits a Command for execution.
public  voidsubmit(IncrementalCommand command)
     Submits an IncrementalCommand for execution.



Method Detail
doCommandCanceled
protected void doCommandCanceled()(Code)
Reports either a CommandCanceledException or an IncrementalCommandCanceledException back through the UncaughtExceptionHandler if one is set.



doExecuteCommands
protected void doExecuteCommands(long startTimeMillis)(Code)
This method will dispatch commands from the command queue. It will dispatch commands until one of the following conditions is true:
  • It consumed its dispatching time slice
  • It encounters a null in the command queue
  • All commands which were present at the start of the dispatching have been removed from the command queue
  • The command that it was processing was canceled due to a false cancellation -- in this case we exit without updating any state

Parameters:
  startTimeMillis - the time when this method started



getPendingCommands
List<Object> getPendingCommands()(Code)
This method is for testing only.



maybeStartExecutionTimer
protected void maybeStartExecutionTimer()(Code)
Starts the dispatch timer if there are commands to dispatch and we are not waiting for a dispatch timer and we are not actively dispatching.



setExecuting
void setExecuting(boolean executing)(Code)
This method is for testing only.



setLast
void setLast(int last)(Code)
This method is for testing only.



submit
public void submit(Command command)(Code)
Submits a Command for execution.
Parameters:
  command - command to submit



submit
public void submit(IncrementalCommand command)(Code)
Submits an IncrementalCommand for execution.
Parameters:
  command - command to submit



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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