what does shutdown() really do
From javadoc Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be accepted. Invocation has no additional effect if already shut down. That is, calling execute() after shutdown() is an error. Sometimes I consider calling shutdown() a rule. Is it just used to forbid new tasks? Without calling shutdown(), what happens?
Mostly it is used to shutdown the ExecutorService i.e. stop it running when you don't need it. ExecutorServices contain a pool of threads. Threads are never cleaned up by the GC so you can't just discard them and assume the threads will clean themselves up. Once the threads have been told to stop they will do so after they complete the current task or almost immediately if otherwise idle. After they have stopped they can be cleaned up by the GC NOTE: Any ThreadLocal values will be retained until the Thread is cleaned up.
The shutdown() method prevents clients to send more work to the executor service i.e no new tasks will be accepted and all the existing tasks will still run to completion unless other actions are taken.Invocation has no additional effect if already shut down
The shutdown method (in short) starts all tasks, that may be submitted, but not yet started (which could be of type Future<E> for example) forbids submitting new tasks makes it possible to gracefully shut down
java regex selecting until string but not substring
OSGI Classloading & Object Sharing
Accessing variable from another class
Extending spring security UsernamePasswordAuthenticationFilter
Any Javadoc style documentation tool for MyBatis XML sqlmaps?
how to design query layer in CQRS
How to Achieve AspectJ “withincode” in Spring AOP
How do I make the Input Exception for this method?
Error. when trying to catch values from a arry list. and pass it to afunction to diplay markers on the map. Android
Finding the derivative of a polynomial using arrays in java
Using a dialog preference with custom layout
Oracle Database 12c in VM on Mac OSX
Stack Recursive Implementation Complexity
JPA IllegalArgumentException, but expected and actual type are identical
How to put a dynamic drop-down list in Eclipse Kepler toolbar?
What happens to MySQL connection when internet connection is lost?