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import unittest

from webkitpy.common.thread.messagepump import MessagePump, MessagePumpDelegate

from webkitpy.common.thread.threadedmessagequeue import ThreadedMessageQueue

class TestDelegate(MessagePumpDelegate):

    def __init__(self):

        self.log = []

    def schedule(self, interval, callback):

        self.callback = callback

        self.log.append("schedule")

    def message_available(self, message):

        self.log.append("message_available: %s" % message)

    def final_message_delivered(self):

        self.log.append("final_message_delivered")

class MessagePumpTest(unittest.TestCase):

    def test_basic(self):

        queue = ThreadedMessageQueue()

        delegate = TestDelegate()

        pump = MessagePump(delegate, queue)

        self.assertEqual(delegate.log, [

            'schedule'

        ])

        delegate.callback()

        queue.post("Hello")

        queue.post("There")

        delegate.callback()

        self.assertEqual(delegate.log, [

            'schedule',

            'schedule',

            'message_available: Hello',

            'message_available: There',

            'schedule'

        ])

        queue.post("More")

        queue.post("Messages")

        queue.stop()

        delegate.callback()

        self.assertEqual(delegate.log, [

            'schedule',

            'schedule',

            'message_available: Hello',

            'message_available: There',

            'schedule',

            'message_available: More',

            'message_available: Messages',

            'final_message_delivered'

        ])