Sunday, July 15, 2012

left hand sending event to right hand - swingWorker

First, remember SW is stateful, and publish() and process() are non-static methods.

The publish() method posts a stream of events to the event Queue. Each event holds a hidden pointer to "this" i.e. the SW instance. EDT recovers the pointer and basically calls this.process().

Both publish() and process() are called on the same (stateful) SW instance, but on different threads. The 2 instance methods are like the left and right hands, designed to interact between themselves.

In SwingWroker, everything else is secondary -- doInBackground(), done(),and type params -- The 2 type params are interesting -- T and V can be identical or T can be a collection of V.

T - the result type returned by doInBackgroun()
V - the type of intermediate results of publish() and process()

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