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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Thread task executor.
"""
import Queue
import threading
import sys
from aria.utils import imports, exceptions
from .base import BaseExecutor
class ThreadExecutor(BaseExecutor):
"""
Thread task executor.
It's easier writing tests using this executor rather than the full-blown sub-process executor.
Note: This executor is incapable of running plugin operations.
"""
def __init__(self, pool_size=1, close_timeout=5, *args, **kwargs):
super(ThreadExecutor, self).__init__(*args, **kwargs)
self._stopped = False
self._close_timeout = close_timeout
self._queue = Queue.Queue()
self._pool = []
for i in range(pool_size):
name = 'ThreadExecutor-{index}'.format(index=i+1)
thread = threading.Thread(target=self._processor, name=name)
thread.daemon = True
thread.start()
self._pool.append(thread)
def _execute(self, ctx):
self._queue.put(ctx)
def close(self):
self._stopped = True
for thread in self._pool:
if self._close_timeout is None:
thread.join()
else:
thread.join(self._close_timeout)
def _processor(self):
while not self._stopped:
try:
ctx = self._queue.get(timeout=1)
self._task_started(ctx)
try:
task_func = imports.load_attribute(ctx.task.function)
arguments = dict(arg.unwrapped for arg in ctx.task.arguments.itervalues())
task_func(ctx=ctx, **arguments)
self._task_succeeded(ctx)
except BaseException as e:
self._task_failed(ctx,
exception=e,
traceback=exceptions.get_exception_as_string(*sys.exc_info()))
# Daemon threads
except BaseException as e:
pass
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