Python IndexedQueue.getIndex方法代码示例

# 需要导入模块: from buildbot.status.persistent_queue import IndexedQueue [as 别名]
# 或者: from buildbot.status.persistent_queue.IndexedQueue import getIndex [as 别名]
class StatusPush(StatusReceiverMultiService):
    """Event streamer to a abstract channel.

    It uses IQueue to batch push requests and queue the data when
    the receiver is down.
    When a PersistentQueue object is used, the items are saved to disk on master
    shutdown so they can be pushed back when the master is restarted.
    """

    def __init__(self, serverPushCb, queue=None, path=None, filter=True,
                 bufferDelay=1, retryDelay=5, blackList=None):
        """
        @serverPushCb: callback to be used. It receives 'self' as parameter. It
        should call self.queueNextServerPush() when it's done to queue the next
        push. It is guaranteed that the queue is not empty when this function is
        called.
        @queue: a item queue that implements IQueue.
        @path: path to save config.
        @filter: when True (default), removes all "", None, False, [] or {}
        entries.
        @bufferDelay: amount of time events are queued before sending, to
        reduce the number of push requests rate. This is the delay between the
        end of a request to initializing a new one.
        @retryDelay: amount of time between retries when no items were pushed on
        last serverPushCb call.
        @blackList: events that shouldn't be sent.
        """
        StatusReceiverMultiService.__init__(self)

        # Parameters.
        self.queue = queue
        if self.queue is None:
            self.queue = MemoryQueue()
        self.queue = IndexedQueue(self.queue)
        self.path = path
        self.filter = filter
        self.bufferDelay = bufferDelay
        self.retryDelay = retryDelay
        if not callable(serverPushCb):
            raise NotImplementedError('Please pass serverPushCb parameter.')
        def hookPushCb():
            # Update the index so we know if the next push succeed or not, don't
            # update the value when the queue is empty.
            if not self.queue.nbItems():
                return
            self.lastIndex = self.queue.getIndex()
            return serverPushCb(self)
        self.serverPushCb = hookPushCb
        self.blackList = blackList

        # Other defaults.
        # IDelayedCall object that represents the next queued push.
        self.task = None
        self.stopped = False
        self.lastIndex = -1
        self.state = {}
        self.state['started'] = str(datetime.datetime.utcnow())
        self.state['next_id'] = 1
        self.state['last_id_pushed'] = 0
        # Try to load back the state.
        if self.path and os.path.isdir(self.path):
            state_path = os.path.join(self.path, 'state')
            if os.path.isfile(state_path):
                self.state.update(json.load(open(state_path, 'r')))

        if self.queue.nbItems():
            # Last shutdown was not clean, don't wait to send events.
            self.queueNextServerPush()

    def startService(self):
        """Starting up."""
        StatusReceiverMultiService.startService(self)
        self.status = self.parent.getStatus()
        self.status.subscribe(self)
        self.initialPush()

    def wasLastPushSuccessful(self):
        """Returns if the "virtual pointer" in the queue advanced."""
        return self.lastIndex <= self.queue.getIndex()

    def queueNextServerPush(self):
        """Queue the next push or call it immediately.

        Called to signal new items are available to be sent or on shutdown.
        A timer should be queued to trigger a network request or the callback
        should be called immediately. If a status push is already queued, ignore
        the current call."""
        # Determine the delay.
        if self.wasLastPushSuccessful():
            if self.stopped:
                # Shutting down.
                delay = 0
            else:
                # Normal case.
                delay = self.bufferDelay
        else:
            if self.stopped:
                # Too bad, we can't do anything now, we're shutting down and the
                # receiver is also down. We'll just save the objects to disk.
                return
#.........这里部分代码省略.........