content: /*
   * 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
   *
   *     https://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.
   */
  
  package org.apache.avro.ipc;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.nio.channels.ClosedChannelException;
  import java.nio.channels.DatagramChannel;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A datagram-based server implementation. This uses a simple, non-standard wire
   * protocol and is not intended for production services.
   */
  public class DatagramServer extends Thread implements Server {
    private static final Logger LOG = LoggerFactory.getLogger(DatagramServer.class);
  
    private final Responder responder;
    private final DatagramChannel channel;
    private final Transceiver transceiver;
  
    public DatagramServer(Responder responder, SocketAddress addr) throws IOException {
      String name = "DatagramServer on " + addr;
  
      this.responder = responder;
  
      this.channel = DatagramChannel.open();
      channel.socket().bind(addr);
  
      this.transceiver = new DatagramTransceiver(channel);
  
      setName(name);
      setDaemon(true);
    }
  
    @Override
    public int getPort() {
      return channel.socket().getLocalPort();
    }
  
    @Override
    public void run() {
      while (true) {
        try {
          transceiver.writeBuffers(responder.respond(transceiver.readBuffers()));
        } catch (ClosedChannelException e) {
          return;
        } catch (IOException e) {
          LOG.warn("unexpected error", e);
          throw new RuntimeException(e);
        }
      }
    }
  
    @Override
    public void close() {
      this.interrupt();
    }
  
    public static void main(String[] arg) throws Exception {
      DatagramServer server = new DatagramServer(null, new InetSocketAddress(0));
      server.start();
      System.out.println("started");
      server.join();
    }
  
  }
  