Executor threading is straight forward. When a task is received to be executed on Executor E, then E will have its own ThreadPoolExecutor instance and the work is placed in the work queue of this executor. Thus, Executors are fully isolated, but still share the same underlying hardware - most importantly the CPUs.

You can configure the IExecutor using the ExecutorConfig (programmatic configuration) or using <executor> (declarative configuration). Please also see the Configuring Executor Service section.