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This is an example to illustrate the reconnection policy. In this example,
we have four partitions. Part0 executes RPC RCI_1.F on part1 which
uses Failed_Until_Restart as reconnection policy. On part1, RCI_1.F executes
RPC RCI_2.F on part2 which uses Blocked_Until_Restart as reconnection
policy. On part2, RCI_2.F executes a RPC on part3 which uses
Rejected_On_Restart as reconnection policy.
Build the application (make) and execute each partition in separate sessions
(three separate windows for example) on the same machine.
* part0 prints a message for every RPC that gets executed.
* Kill part1. part0 reports that RCI_1.F cannot be executed and that
Communication_Error was raised. Any attempt to execute RCI_1.F
will raise Communication_Error again until part1 (and RCI_1) is restarted.
Now restart part1. part0 will print the usual message again.
This is the Failed_Until_Restart reconnection policy.
* Kill part2. part0 hangs and no longer prints the usual message.
Any attempt to execute RCI_2.F is kept blocking until part2 (and RCI_2)
is restarted. No Communication_Error exception is raised. This
behaviour is similar to the one you would get with a partition
whose elaboration is not finished yet. Now restart part2. part0 will print
the usual message again. This is the Blocked_Until_Restart reconnection
policy.
* Kill part3. part0 hangs and no longer prints the usual message.
Communication_Error is raised on part2 for any attempt to execute
RCI_3.F. Restart part3 and you will get "raised PROGRAM_ERROR : RCI unit
rci_3 is already declared". This is the Rejected_On_Restart reconnection
policy. Once a partition which contains at least one RCI package has been
started, it is forbidden to restart it later. This is the same behaviour
you would get by executing a partition which contains at least a RCI package
twice. A RCI package has to be unique in the distributed system. In this
example, RCI_3 was already declared and even if its partition dies, it cannot
be relocated. This is the default reconnection policy.
After several attempts to execute RCI_3.F, RCI_2.F raises Program_Error
which is propagated to Main and the distributed application terminates
smoothly.
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