In my opinion this is a bit overkill, at least the options for using DelayQueue and PriorityBlockingQueue. They require the Runnable queue elements to implement the Delayed and Comparable interfaces, respectively. I don't see how to make use of that in an EJB method call.
I looked at the Sun ThreadPoolExecutor docs and have now played a little with it in a standalone program. I honestly think the design is a bit bizarre. I would expect the thread pool to expand to max capacity before tasks are put in the wait queue. For the purpose of optimizing CPU core utilization, the number of threads in the operating system run-queue is the only important number, not the number of provisioned threads in a JVM thread pool. But this is slightly off-topic here. I believe it's enough to have just one more configuration property for TomEE: AsynchronousPool.QueueSize. If this is 0, let the container use a SynchronousQueue. Otherwise use a LinkedBlockingQueue with the specified capacity. That way it's possible to have any of the three queueing strategies mentioned in the ThreadPoolExecutor javadocs. I can't imagine a situation where using an ArrayBlockingQueue instead of a bounded LinkedBlockingQueue in TomEE really makes a big difference, but I could be wrong about that. -- Björn Danielsson Cuspy Code AB David Blevins <david.blev...@gmail.com> wrote: > On Aug 20, 2012, at 10:55 AM, Romain Manni-Bucau wrote: > >> that's because we use a linked blocking queue >> >> maybe we should make it configurable, not sure... > > > Made it configurable. Code is basically: > > public static AsynchronousPool create(AppContext appContext) { > final Options options = appContext.getOptions(); > > final String id = appContext.getId(); > final int corePoolSize = options.get("AsynchronousPool.CorePoolSize", > 10); > final int maximumPoolSize = > Math.max(options.get("AsynchronousPool.MaximumPoolSize", 20), corePoolSize); > final Duration keepAliveTime = > options.get("AsynchronousPool.KeepAliveTime", new Duration(60, > TimeUnit.SECONDS)); > final BlockingQueue queue = options.get("AsynchronousPool.QueueType", > QueueType.LINKED).create(options); > > return new AsynchronousPool(id, corePoolSize, maximumPoolSize, > keepAliveTime, queue); > } > > private static enum QueueType { > ARRAY, > DELAY, > LINKED, > PRIORITY, > SYNCHRONOUS; > > public BlockingQueue create(Options options) { > switch (this) { > case ARRAY: { > return new > ArrayBlockingQueue(options.get("AsynchronousPool.QueueSize", 100)); > } > case DELAY: { > return new DelayQueue(); > } > case LINKED: { > return new > LinkedBlockingQueue(options.get("AsynchronousPool.QueueSize", > Integer.MAX_VALUE)); > } > case PRIORITY: { > return new PriorityBlockingQueue(); > } > case SYNCHRONOUS: { > return new > SynchronousQueue(options.get("AsynchronousPool.QueueFair", false)); > } > default: { > // The Options class will throw an error if the user > supplies an unknown enum string > // The only way we can reach this is if we add a new > QueueType element and forget to > // implement it in the above switch statement. > throw new IllegalArgumentException("Unknown QueueType > type: " + this); > } > } > } > }