handle
This interface is designed for implementing custom handlers that respond to message retrieval operations. It defines a single handle method that is called with a PNSignalResult instance, which contains the signal.
Usage example:
OnSignalHandler handler = pnSignalResult -> {
System.out.println("Received message: " + pnSignalResult.getMessage());
};
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See also
for more information about the message result provided to this handler.