99 lines
2.7 KiB
Python
99 lines
2.7 KiB
Python
# 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 eventlet
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import os
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from eventlet import greenpool
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from eventlet import greenthread
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from gbpservice.nfp.core import log as nfp_logging
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LOG = nfp_logging.getLogger(__name__)
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def _thread_done(gt, *args, **kwargs):
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kwargs['pool'].thread_done(kwargs['thread'])
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"""Descriptor class for green thread """
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class Thread(object):
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def __init__(self, thread, pool):
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self.thread = thread
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self.thread.link(_thread_done, pool=pool, thread=self)
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def stop(self):
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self.thread.kill()
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def wait(self):
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return self.thread.wait()
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def link(self, func, *args, **kwargs):
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self.thread.link(func, *args, **kwargs)
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def identify(self):
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return "(%d -> %s)" % (os.getpid(), 'Thread')
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"""Abstract class to manage green threads """
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class ThreadPool(object):
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def __init__(self, thread_pool_size=10):
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self.pool = greenpool.GreenPool(thread_pool_size)
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self.threads = []
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def dispatch(self, callback, *args, **kwargs):
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"""Invokes the specified function in one of the thread """
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gt = self.pool.spawn(callback, *args, **kwargs)
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th = Thread(gt, self)
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self.threads.append(th)
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return th
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def thread_done(self, thread):
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"""Invoked when thread is complete, remove it from cache """
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self.threads.remove(thread)
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def stop(self):
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"""To stop the thread """
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current = greenthread.getcurrent()
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# Make a copy
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for x in self.threads[:]:
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if x is current:
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# Skipping the current thread
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continue
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try:
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x.stop()
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except Exception as ex:
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message = "Exception - %s" % (ex)
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LOG.exception(message)
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def wait(self):
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"""Wait for the thread """
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current = greenthread.getcurrent()
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# Make a copy
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for x in self.threads[:]:
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if x is current:
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continue
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try:
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x.wait()
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except eventlet.greenlet.GreenletExit:
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pass
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except Exception as ex:
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message = "Unexpected exception - %r" % (ex)
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LOG.error(message)
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