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public interface Cancellable { |
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/** |
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< |
* Cancels execution of this task if it has not already completed. |
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< |
* If this task has not started when <tt>cancel</tt> is called, this |
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< |
* task will never run. If the task has already started, then |
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< |
* the <tt>interruptIfRunning</tt> parameter determines whether the |
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< |
* thread executing this task should be interrupted in an attempt to |
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< |
* stop the task. |
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> |
* Attempts to cancel execution of this task. This attempt will |
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> |
* fail if the task has already completed or could not be |
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> |
* cancelled for some other reason. If successful, and this task |
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> |
* has not started when <tt>cancel</tt> is called, this task will |
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> |
* never run. If the task has already started, then the |
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> |
* <tt>interruptIfRunning</tt> parameter determines whether the |
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> |
* thread executing this task should be interrupted in an attempt |
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> |
* to stop the task. |
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* |
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* @param mayInterruptIfRunning <tt>true</tt> if the thread executing this |
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* task should be interrupted; otherwise, in-progress tasks are allowed |
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* to complete |
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< |
* @return <tt>true</tt> if task has not already completed or been |
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< |
* cancelled; <tt>false</tt> otherwise |
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> |
* @return <tt>false</tt> if the task could not be cancelled, |
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> |
* typically because is has already completed normally; |
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> |
* <tt>true</tt> otherwise |
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*/ |
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boolean cancel(boolean mayInterruptIfRunning); |
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