IoC - parallel
Page added by Ulrich Stärk
Parallel Execution
The ParallelExecutor|../apidocs/org/apache/tapestry5/ioc/services/ParallelExecutor.html allows a computation to occur in parallel.
It can be used in two ways. First, with an explicit Future:
FutureString future = executor.invoke(new InvokableString() { ... });
The executor will submit the Invokable to a thread pool for execution in the background.
The ultimate value of the Invokable is available from invoking get() on the Future; this will block until the value is ready.
Other methods on Future can cancel the execution, or get the value only if it is ready within a timeout.
The thread pool is started automatically as needed, and will shutdown when the Registry itself is shutdown.
Another alternative will return an object, not a Future:
RSSFeed feed = executor.invoke(RSSFeed.class, new InvokableRSSFeed() { ... });
This only works if the type is an interface. A proxy for the interface is created around the Future object; any invocation on the proxy will invoke get() on the Future.
Configuration
Configuraton symbols are defined in IOCSymbols|../apidocs/org/apache/tapestry5/ioc/IOCSymbols.html.
tapestry.thread-pool-enabled If "true", the default, then the thread pool will operate. If "false", then ParallelExecutor's implementation changes to invoke the Invokable immediately, not in a pooled thread. tapestry.thread-pool.core-pool-size Minimum size of the thread pool. Defaults to 3. tapestry.thread-pool.max-pool-size Maximum number of threads (active or inactive) in the thread pool. Defaults to 20. tapestry.thread-pool.keep-alive Time to keep waiting threads alive. Defaults to "1 m" (one minute).
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