Saturday, June 15, 2013

replacement for stop/suspend/resume in java threads - intrusive?

c# Thread.Abort is slightly better than java's stop()...

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For suspend/resume, [[java thread programming]] P91 has a BestReplacement.java. However, I feel most designs don't need suspend and resume. wait/notify is the standard replacement technique.

Nowadays, even wait/notify is seldom used by app developers. Nevertheless, BestReplacement.java presents some FUNDAMENTAL techniques or idioms. Do you ever need to go beyond the java5
concurrent utilities?

Some veterans point out that suspend/resume/stop are intrusive operations on a vm-thread via the thread handle. The non-intrusive alternatives are locks, conditions, interrupts and flow-control flags monitored by the "driver" methods (the method seeded in the thread). Most good designs use a combination of the above constructs to let the thread decide when to suspend/resume/stop itself. In contrast, the intrusive operations are unconditional, abrupt, unilateral actions on the thread by another thread.

A crude analogy -- an intrusive investment advisor would buy/sell on my behalf, without consultation.

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