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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 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;
A datagram-based Transceiver implementation. This uses a simple, non-standard wire protocol and is not intended for production services.
public class DatagramTransceiver extends Transceiver {
  private static final Logger LOG
    = LoggerFactory.getLogger(DatagramTransceiver.class);
  private static final int MAX_SIZE = 16 * 1024;
  private DatagramChannel channel;
  private SocketAddress remote;
  private ByteBuffer buffer = ByteBuffer.allocate();
  public String getRemoteName() { return .toString(); }
  public DatagramTransceiver(SocketAddress remotethrows IOException {
    this. = remote;
  public DatagramTransceiver(DatagramChannel channel) {
    this. = channel;
  public synchronized List<ByteBufferreadBuffers() throws IOException {
    .info("received from "+);
    List<ByteBufferbuffers = new ArrayList<ByteBuffer>();
    while (true) {
      int length = .getInt();
      if (length == 0) {                          // end of buffers
        return buffers;
      ByteBuffer chunk = .slice();          // use data without copying
  public synchronized void writeBuffers(List<ByteBufferbuffers)
    throws IOException {
    for (ByteBuffer b : buffers) {
      .put(b);                              // copy data.  sigh.
    .info("sent to "+);
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