Created
August 26, 2014 08:45
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this is about how trac works
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| from __future__ import print_function | |
| from trac.core import Component, ComponentManager, Interface, ExtensionPoint, implements | |
| class IMessageObserver(Interface): | |
| def message_received(message): | |
| """ called when message is received. """ | |
| class MessageSender(Component): | |
| """ component that sends messages. """ | |
| observers = ExtensionPoint(IMessageObserver) | |
| def __init__(self): | |
| super(MessageSender, self).__init__() | |
| def send_message(self, message): | |
| for observer in self.observers: | |
| observer.message_received(message) | |
| class MessagePrinter(Component): | |
| """ component that prints messages. """ | |
| implements(IMessageObserver) | |
| def __init__(self): | |
| super(MessagePrinter, self).__init__() | |
| def message_received(self, message): | |
| print("MessageObserver: %s" % message) | |
| class MessageYeller(Component): | |
| """ component that prints messages. """ | |
| implements(IMessageObserver) | |
| def __init__(self): | |
| super(MessageYeller, self).__init__() | |
| def message_received(self, message): | |
| print("MessageYeller: %s" % message.upper()) | |
| if __name__ == "__main__": | |
| c = ComponentManager() | |
| MessageSender(c) | |
| MessagePrinter(c) | |
| MessageYeller(c) | |
| sender = c.components.get(MessageSender) | |
| sender.send_message("printed message") |
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