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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.
+#
+
+
+import logging
+logger = logging.getLogger(__name__)
+
+from multiprocessing import Process, Value, Condition, reduction
+
+from TServer import TServer
+from thrift.transport.TTransport import TTransportException
+
+
+class TProcessPoolServer(TServer):
+ """Server with a fixed size pool of worker subprocesses to service requests
+
+ Note that if you need shared state between the handlers - it's up to you!
+ Written by Dvir Volk, doat.com
+ """
+ def __init__(self, *args):
+ TServer.__init__(self, *args)
+ self.numWorkers = 10
+ self.workers = []
+ self.isRunning = Value('b', False)
+ self.stopCondition = Condition()
+ self.postForkCallback = None
+
+ def setPostForkCallback(self, callback):
+ if not callable(callback):
+ raise TypeError("This is not a callback!")
+ self.postForkCallback = callback
+
+ def setNumWorkers(self, num):
+ """Set the number of worker threads that should be created"""
+ self.numWorkers = num
+
+ def workerProcess(self):
+ """Loop getting clients from the shared queue and process them"""
+ if self.postForkCallback:
+ self.postForkCallback()
+
+ while self.isRunning.value:
+ try:
+ client = self.serverTransport.accept()
+ if not client:
+ continue
+ self.serveClient(client)
+ except (KeyboardInterrupt, SystemExit):
+ return 0
+ except Exception as x:
+ logger.exception(x)
+
+ def serveClient(self, client):
+ """Process input/output from a client for as long as possible"""
+ itrans = self.inputTransportFactory.getTransport(client)
+ otrans = self.outputTransportFactory.getTransport(client)
+ iprot = self.inputProtocolFactory.getProtocol(itrans)
+ oprot = self.outputProtocolFactory.getProtocol(otrans)
+
+ try:
+ while True:
+ self.processor.process(iprot, oprot)
+ except TTransportException as tx:
+ pass
+ except Exception as x:
+ logger.exception(x)
+
+ itrans.close()
+ otrans.close()
+
+ def serve(self):
+ """Start workers and put into queue"""
+ # this is a shared state that can tell the workers to exit when False
+ self.isRunning.value = True
+
+ # first bind and listen to the port
+ self.serverTransport.listen()
+
+ # fork the children
+ for i in range(self.numWorkers):
+ try:
+ w = Process(target=self.workerProcess)
+ w.daemon = True
+ w.start()
+ self.workers.append(w)
+ except Exception as x:
+ logger.exception(x)
+
+ # wait until the condition is set by stop()
+ while True:
+ self.stopCondition.acquire()
+ try:
+ self.stopCondition.wait()
+ break
+ except (SystemExit, KeyboardInterrupt):
+ break
+ except Exception as x:
+ logger.exception(x)
+
+ self.isRunning.value = False
+
+ def stop(self):
+ self.isRunning.value = False
+ self.stopCondition.acquire()
+ self.stopCondition.notify()
+ self.stopCondition.release()