call trigger
The specification of the effect caused by the reception of a call by an active object. If an object (through its class) has no trigger for an operation, the receipt of a call causes an immediate effect. That is, an effect occurs concurrently with any other effect in the system, in particular, concurrently with any activity by the target object itself. The most common immediate effect is the execution of a method in the thread of control of the caller. Note that many methods may execute concurrently on the same target object if they are invoked from independent threads of control. There is no synchronization of these executions with each other or with any main activity by the target object.
In contrast, if an active object has a trigger ...
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