Method that may be invoked by a
ThreadPoolExecutor when
execute cannot accept a
task. This may occur when no more threads or queue slots are
available because their bounds would be exceeded, or upon
shutdown of the Executor.
In the absence of other alternatives, the method may throw
an unchecked RejectedExecutionException, which will be
propagated to the caller of execute.
Parameters:
- r - the runnable task requested to be executed
- executor - the executor attempting to execute this task
Throws:
- RejectedExecutionException - if there is no remedy
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A handler for tasks that cannot be executed by a 