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POJava Concurrency in Practice: BoundedExecutor implementation
 

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    <p>This is the implementation of the BoundedExecutor class in the Java Concurrency in Practice book:</p> <pre><code>public class BoundedExecutor { private final Executor exec; private final Semaphore semaphore; public BoundedExecutor(Executor exec, int bound) { this.exec = exec; this.semaphore = new Semaphore(bound); } public void submitTask(final Runnable command) throws InterruptedException { semaphore.acquire(); try { exec.execute(new Runnable() { public void run() { try { command.run(); } finally { semaphore.release(); } } }); } catch (RejectedExecutionException e) { semaphore.release(); } } } </code></pre> <p>Is there a reason why the RejectedExecutionException is being caught instead of letting it propagate further? In this case, if the task is rejected, whoever submits the task will be none the wiser.</p> <p>Isn't is better to just replace the catch-block with a finally-block?</p> <p>This is my implementation of a BoundedExecutor that accepts a Callable instead of a Runnable:</p> <pre><code>public class BoundedExecutor { private final ExecutorService exec; private final Semaphore semaphore; public BoundedExecutor(ExecutorService exec, int bound) { this.exec = exec; this.semaphore = new Semaphore(bound); } public &lt;V&gt; Future&lt;V&gt; submitTask(final Callable&lt;V&gt; command) throws InterruptedException { semaphore.acquire(); try { return exec.submit(new Callable&lt;V&gt;() { @Override public V call() throws Exception { try { return command.call(); } finally { semaphore.release(); } } }); } catch (RejectedExecutionException e) { semaphore.release(); throw e; } } } </code></pre> <p>Is it a correct implementation?</p> <p>Thanks!</p>
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