flink-python/pyflink/pyflink_callback_server.py

################################################################################
#  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 time

from pyflink.java_gateway import get_gateway


if __name__ == '__main__':
    # just a daemon process used to serve the rpc call from Java.
    gateway = get_gateway()
    watchdog = gateway.jvm.org.apache.flink.client.python.PythonGatewayServer.watchdog
    try:
        while watchdog.ping():
            time.sleep(1)
    finally:
        get_gateway().close()
        exit(0)