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libcontextsubscriber is using only asynchronous DBUS calls to
communicate with the providers/commander. Here is the process to
demonstrate it.
You will need 3 terminals, one for the context-listen, one for a "slow
provider" and one for a "fast provider". Both of the providers will
be emulated by using the flexiprovider.
terminal all: start from the directory of this README file
terminal fast> cd ../../python/
terminal fast> ./context-provide com.nokia.fast int test.fast 316
terminal slow> cd ../../python/
terminal slow> ./context-provide com.nokia.slow int test.slow 530
terminal slow (inside python)> import time; time.sleep(10)
terminal cli> export CONTEXT_PROVIDERS=.
terminal cli> ../cli/context-listen test.fast test.slow
terminal fast (inside python)> set('test.fast', 613)
On terminal cli, you will see that the fast property is received at
start, the change to 613 is also immediately available, in spite of we
are waiting for the slow provider's subscription object. After the
sleep(10) is over in slow provider the initial value from there is
also received.
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