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POCancelling an Asynchronous Method Invocation
 

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  1. POCancelling an Asynchronous Method Invocation
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    <p>I am reading the <a href="http://docs.oracle.com/javaee/6/tutorial/doc/gkkqg.html#gkidb" rel="nofollow">Java EE docs</a> and I have a little problem to understand the purpose of the <code>mayInterruptIfRunning</code> parameter in the method <code>cancel(boolean mayInterruptIfRunning)</code>. I have infered from the docs that the parameter is used to notify the session that the user tried to cancel the invocation and therefore the <code>SessionContext.wasCancelled()</code> method should return true (if the <code>mayInterruptIfRunning</code> was set to true) even if the cancelation failed. If it is right then what is the answer to the following questions:</p> <p>1) When would someone call the cancel method with the <code>mayInterruptIfRunning</code> parameter set to false and what would it mean?</p> <p>2) What is the difference in results coming from the methods <code>SessionContext.wasCancelled()</code> and <code>Future&lt;v&gt;.isCancelled()</code>? Am I right, that the second retuns false if the cancelation failed, whereas the first one returns true even if the cancelation failed provided that one has set the <code>mayInterruptIfRunning</code> to true?</p> <p><strong>Update:</strong></p> <p>Based on the answer I would like to set this question: </p> <p>Assuming that one calls <code>Future.cancel()</code> method with parameter <code>mayInterruptIfRunning</code> false. When is the task cancelled and when not? On what factor does it depend? If the cancellation happens (succeeded) in the above case, will the <code>SessionContext.wasCancelled()</code> return false, whereas the <code>Futute.isCancelled()</code> true? </p>
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