Constructor and Lifecycle Methods
Pool Size Terms
| Size | Description |
|---|---|
| Core Size | Core number of threads that are initialized and can remain in the threadpool even when idle |
| Current Size | Current number of threads, starts as core size, more are added depending on the type of threadpool |
| Max Size Size | Absolute maximum can handle concurrently |
Policies
| Policy | Description |
|---|---|
| AbortPolicy | throws exception |
| DiscardPolicy | throws away task silently |
| DiscardOldestPolicy | submits new task and discards oldest task |
| CallerRunPolicy | caller thread runs the task |
info
Note: The behavior of these policies applies when the maximum pool size or work queue capacity has been reached.
Lifecycle Methods
/*
* Initiates shutdown
* All tasks that are submitted thereafter are rejected
* Will complete tasks in BlockingQueue before shutting down
*/
service.shutdown()
/*
* Checks if ThreadPool has already shutdown
*/
service.isShutdown()
/*
* Returns true if shutdown and all tasks completed
*/
service.isTerminated()
/*
* Blocks until all tasks are completed or if timeout occurs
*/
service.awaitTermination(10, TimeUnit.SECONDS);
/*
* Initiates shutdown and returns all queued tasks
*/
List<Runnable> runnables = service.shutdownNow()