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I don't get the actual (semantic) difference between the two "expressions".
It is said "loop" fits to "react" and "while(true)" to "receive", because "react" does not return and "loop" is a function which calls the body again all over again (it least this is what I deduct from the sources - I am not really familiar with the used "andThen"). "Receive" blocks one Thread from the pool, "react" does not. However, for "react" a Thread is looked up which the function can be attached to.
So the question is: why can't I use "loop" with "receive"? It also seems to behave different (and better!) than the "while(true)" variant, at least this is what I observe in a profiler. Even more strange is that calling a ping-pong with "-Dactors.maxPoolSize=1 -Dactors.corePoolSize=1" with "while(true)" and "receive" blocks immediately (that's what I would expect) - however, with "loop" and "receive", it works without problems - in one Thread - how's this?
Thanks!
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The while loop in python runs until the "while" condition is satisfied. The "while true" loop in python runs without any conditions until the break statement executes inside the loop. To run a statement if a python while loop fails, the programmer can implement a python "while" with else loop.
while loops use only Boolean expression and when it is true. So when it gets true it'll execute until it gets false. while(false) means the condition is false which will end the loop. while(True) means the condition is True which will continue the loop.
while True means loop forever. The while statement takes an expression and executes the loop body while the expression evaluates to (boolean) "true". True always evaluates to boolean "true" and thus executes the loop body indefinitely. It's an idiom that you'll just get used to eventually!
For is entry controlled loop. While is also entry controlled loop. used to obtain the result only when number of iterations is known.
The critical difference between while and loop is that while restricts the loop iterations to occur in the same thread. The loop construct (as described by Daniel) enables the actor sub-system to invoke the reactions on any thread it chooses.
Hence using a combination of receive within while (true) ties an actor to a single thread. Using loop and react allows you run support many actors on a single thread.
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