public interface ActiveEvent
dispatch()method will be called when the event is dispatched, using the
This is a very useful mechanism for avoiding deadlocks. If
a thread is executing in a critical section (i.e., it has entered
one or more monitors), calling other synchronized code may
cause deadlocks. To avoid the potential deadlocks, an
ActiveEvent can be created to run the second section of
code at later time. If there is contention on the monitor,
the second thread will simply block until the first thread
has finished its work and exited its monitors.
For security reasons, it is often desirable to use an
to avoid calling untrusted code from a critical thread. For
instance, peer implementations can use this facility to avoid
making calls into user code from a system thread. Doing so avoids
potential deadlocks and denial-of-service attacks.