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31 * Written by Doug Lea with assistance from members of JCP JSR-166
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36 package java.util.concurrent;
39 * A handler for tasks that cannot be executed by a {@link ThreadPoolExecutor}.
44 public interface RejectedExecutionHandler {
47 * Method that may be invoked by a {@link ThreadPoolExecutor} when
48 * {@link ThreadPoolExecutor#execute execute} cannot accept a
49 * task. This may occur when no more threads or queue slots are
50 * available because their bounds would be exceeded, or upon
51 * shutdown of the Executor.
53 * <p>In the absence of other alternatives, the method may throw
54 * an unchecked {@link RejectedExecutionException}, which will be
55 * propagated to the caller of {@code execute}.
57 * @param r the runnable task requested to be executed
58 * @param executor the executor attempting to execute this task
59 * @throws RejectedExecutionException if there is no remedy
61 void rejectedExecution(Runnable r, ThreadPoolExecutor executor);