deferred_demo.py 文件源码

def getHtml(self, request):
        deferred = self.prepareProcessList()

        def cb(processes):
            self.logger.debug("getHtml() cb(%r)", processes)
            request.write(self.fillTemplate(model = {
                        "processes": sorted(processes, key=lambda x: int(x.pid))
                        }))
            request.finish()

        def eb(failure):
            self.logger.debug("getHtml() eb(%r)", failure)
            if isinstance(failure.type, Exception):
                util.logTwistedFailure(self.logger, failure,
                                       "Exception thrown while getting process list")
            self.serverError(request)
            request.write("Internal Server Error")
            request.finish()

        deferred.addCallbacks(cb, eb)
        return server.NOT_DONE_YET

    #
    # This method works the same way as the getHtml() method above,
    # but as expected, the callback produces JSON instead of HTML, and
    # does not call the template engine.
    #
    # Note that we use our own JSON encoder. This is actually just an
    # extension to the JSON encoder provided by the standard library,
    # but it has a few nice features that the standard JSON encoder
    # doesn't have. For example, it allows each class to define its
    # own JSON encoder method, called __json__(), which will be called
    # if available to convert an object to JSON.
    #