How to implement Asynchronous Inter Thread Communication in java?

Question

I am developing one code in which I have one parent thread and one child thread.Now, my scenario is like mentioned below,

• Parent thread start the child thread
• after starting the child thread it continuous to work what it is doing.
• Now one time occurs that child thread want to call the method in the main thread
• then it call asynchronously the main thread with that method.

I also want to clarify that I know the concurrency package in java but it is doing synchronously i.e. main thread have to wait for the child thread till it complete the execution,but I want the main thread to do continuous work while child thread executing.

My implementation is like SwingWorker Thread in java

Answer 1

You don't get to "call a method in the main thread". The only thing you can do is implement a specific mechanism whereby the main thread, by its own initiative, executes a method on an object which was provided by the child thread.

The above roughly describes what the Swing's mechanism does: the "main" thread (in that case, the Event Dispatch Thread) dequeues objects from a global queue and, if the object's type is appropriate, invokes the run method on an associated instance of Runnable.

Main point: in Swing the EDT doesn't "continue to work what it is doing"; it specifically waits for other threads to tell it what to do via this mechanism and otherwise just blocks, doing nothing at all.