View Javadoc

    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.transport.socket.nio.support;
    21
    22  import java.util.Queue;
    23
    24  import org.apache.mina.common.ByteBuffer;
    25  import org.apache.mina.common.IoFilter.WriteRequest;
    26  import org.apache.mina.common.IoFilterChain;
    27  import org.apache.mina.common.IoSession;
    28  import org.apache.mina.common.support.AbstractIoFilterChain;
    29
    30  /**
    31   * An {@link IoFilterChain} for datagram transport (UDP/IP).
    32   *
    33   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    34   */
    35  class DatagramFilterChain extends AbstractIoFilterChain {
    36
    37      DatagramFilterChain(IoSession parent) {
    38          super(parent);
    39      }
    40
    41      @Override
    42      protected void doWrite(IoSession session, WriteRequest writeRequest) {
    43          DatagramSessionImpl s = (DatagramSessionImpl) session;
    44          Queue<WriteRequest> writeRequestQueue = s.getWriteRequestQueue();
    45
    46          // SocketIoProcessor.doFlush() will reset it after write is finished
    47          // because the buffer will be passed with messageSent event.
    48          ByteBuffer buffer = (ByteBuffer) writeRequest.getMessage();
    49          buffer.mark();
    50
    51          int remaining = buffer.remaining();
    52          if (remaining == 0) {
    53              s.increaseScheduledWriteRequests();
    54          } else {
    55              s.increaseScheduledWriteBytes(buffer.remaining());
    56          }
    57
    58          writeRequestQueue.add(writeRequest);
    59
    60          if (session.getTrafficMask().isWritable()) {
    61              s.getManagerDelegate().flushSession(s);
    62          }
    63      }
    64
    65      @Override
    66      protected void doClose(IoSession session) {
    67          DatagramSessionImpl s = (DatagramSessionImpl) session;
    68          DatagramService manager = s.getManagerDelegate();
    69          if (manager instanceof DatagramConnectorDelegate) {
    70              manager.closeSession(s);
    71          } else {
    72              ((DatagramAcceptorDelegate) manager).getListeners()
    73                      .fireSessionDestroyed(session);
    74              session.getCloseFuture().setClosed();
    75          }
    76      }
    77  }