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    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;
    21
    22  import java.io.IOException;
    23  import java.util.Queue;
    24
    25  import org.apache.mina.common.ByteBuffer;
    26  import org.apache.mina.common.IoFilter.WriteRequest;
    27  import org.apache.mina.common.IoFilterChain;
    28  import org.apache.mina.common.IoSession;
    29  import org.apache.mina.common.support.AbstractIoFilterChain;
    30
    31  /**
    32   * An {@link IoFilterChain} for socket transport (TCP/IP).
    33   *
    34   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    35   */
    36  class SocketFilterChain extends AbstractIoFilterChain {
    37
    38      SocketFilterChain(IoSession parent) {
    39          super(parent);
    40      }
    41
    42      @Override
    43      protected void doWrite(IoSession session, WriteRequest writeRequest) {
    44          SocketSessionImpl s = (SocketSessionImpl) session;
    45          Queue<WriteRequest> writeRequestQueue = s.getWriteRequestQueue();
    46
    47          // SocketIoProcessor.doFlush() will reset it after write is finished
    48          // because the buffer will be passed with messageSent event.
    49          ByteBuffer buffer = (ByteBuffer) writeRequest.getMessage();
    50          buffer.mark();
    51
    52          int remaining = buffer.remaining();
    53          if (remaining == 0) {
    54              s.increaseScheduledWriteRequests();
    55          } else {
    56              s.increaseScheduledWriteBytes(buffer.remaining());
    57          }
    58
    59          writeRequestQueue.add(writeRequest);
    60
    61          if (session.getTrafficMask().isWritable()) {
    62              s.getIoProcessor().flush(s);
    63          }
    64      }
    65
    66      @Override
    67      protected void doClose(IoSession session) throws IOException {
    68          SocketSessionImpl s = (SocketSessionImpl) session;
    69          s.getIoProcessor().remove(s);
    70      }
    71  }