34b358a137
Instead of using a reader/writer lock in the cache types just take advantage of the fact that single, non-mutating operations on dictionaries are thread-safe in python. This means we can remove the need to have simple read-only operations using read-locks and can just use a simpler lock around write-operations or around read/write operations that span multiple dictionary operations (like iteration). Change-Id: I4679275d7fe25fac12a6b05e8aa38da95649f4f6
49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import random
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import six
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from taskflow.engines.worker_based import protocol as pr
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from taskflow.types import cache as base
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class RequestsCache(base.ExpiringCache):
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"""Represents a thread-safe requests cache."""
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def get_waiting_requests(self, tasks):
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"""Get list of waiting requests by tasks."""
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waiting_requests = []
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with self._lock:
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for request in six.itervalues(self._data):
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if request.state == pr.WAITING and request.task_cls in tasks:
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waiting_requests.append(request)
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return waiting_requests
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class WorkersCache(base.ExpiringCache):
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"""Represents a thread-safe workers cache."""
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def get_topic_by_task(self, task):
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"""Get topic for a given task."""
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available_topics = []
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with self._lock:
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for topic, tasks in six.iteritems(self._data):
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if task in tasks:
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available_topics.append(topic)
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return random.choice(available_topics) if available_topics else None
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