/*
    * Copyright 2009 Red Hat, Inc.
    *
    * Red Hat 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.
   */
  package org.jboss.netty.channel.socket.nio;
  
  import java.net.DatagramSocket;
  import java.util.Map;
  
  import org.jboss.netty.channel.socket.DefaultDatagramChannelConfig;
  import org.jboss.netty.logging.InternalLogger;
  import org.jboss.netty.logging.InternalLoggerFactory;
  import org.jboss.netty.util.internal.ConversionUtil;
  
  /**
   * The default {@link NioSocketChannelConfig} implementation.
   *
   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
   * @author Daniel Bevenius (dbevenius@jboss.com)
   *
   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
   *
   */
  class DefaultNioDatagramChannelConfig extends DefaultDatagramChannelConfig
          implements NioDatagramChannelConfig {
  
      private static final InternalLogger logger =
              InternalLoggerFactory
                      .getInstance(DefaultNioDatagramChannelConfig.class);
  
      private volatile int writeBufferHighWaterMark = 64 * 1024;
      private volatile int writeBufferLowWaterMark = 32 * 1024;
      private volatile int writeSpinCount = 16;
  
      DefaultNioDatagramChannelConfig(DatagramSocket socket) {
          super(socket);
      }
  
      @Override
      public void setOptions(Map<String, Object> options) {
          super.setOptions(options);
          if (getWriteBufferHighWaterMark() < getWriteBufferLowWaterMark()) {
              // Recover the integrity of the configuration with a sensible value.
              setWriteBufferLowWaterMark0(getWriteBufferHighWaterMark() >>> 1);
              // Notify the user about misconfiguration.
              logger.warn("writeBufferLowWaterMark cannot be greater than "
                      + "writeBufferHighWaterMark; setting to the half of the "
                      + "writeBufferHighWaterMark.");
          }
      }
  
      @Override
      public boolean setOption(String key, Object value) {
          if (super.setOption(key, value)) {
              return true;
          }
  
          if (key.equals("writeBufferHighWaterMark")) {
              setWriteBufferHighWaterMark0(ConversionUtil.toInt(value));
          } else if (key.equals("writeBufferLowWaterMark")) {
              setWriteBufferLowWaterMark0(ConversionUtil.toInt(value));
          } else if (key.equals("writeSpinCount")) {
              setWriteSpinCount(ConversionUtil.toInt(value));
          } else {
              return false;
          }
          return true;
      }
  
      public int getWriteBufferHighWaterMark() {
          return writeBufferHighWaterMark;
      }
  
      public void setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
          if (writeBufferHighWaterMark < getWriteBufferLowWaterMark()) {
              throw new IllegalArgumentException(
                      "writeBufferHighWaterMark cannot be less than " +
                              "writeBufferLowWaterMark (" +
                              getWriteBufferLowWaterMark() + "): " +
                              writeBufferHighWaterMark);
          }
          setWriteBufferHighWaterMark0(writeBufferHighWaterMark);
      }
  
      private void setWriteBufferHighWaterMark0(int writeBufferHighWaterMark) {
          if (writeBufferHighWaterMark < 0) {
              throw new IllegalArgumentException("writeBufferHighWaterMark: " +
                     writeBufferHighWaterMark);
         }
         this.writeBufferHighWaterMark = writeBufferHighWaterMark;
     }
 
     public int getWriteBufferLowWaterMark() {
         return writeBufferLowWaterMark;
     }
 
     public void setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
         if (writeBufferLowWaterMark > getWriteBufferHighWaterMark()) {
             throw new IllegalArgumentException(
                     "writeBufferLowWaterMark cannot be greater than " +
                             "writeBufferHighWaterMark (" +
                             getWriteBufferHighWaterMark() + "): " +
                             writeBufferLowWaterMark);
         }
         setWriteBufferLowWaterMark0(writeBufferLowWaterMark);
     }
 
     private void setWriteBufferLowWaterMark0(int writeBufferLowWaterMark) {
         if (writeBufferLowWaterMark < 0) {
             throw new IllegalArgumentException("writeBufferLowWaterMark: " +
                     writeBufferLowWaterMark);
         }
         this.writeBufferLowWaterMark = writeBufferLowWaterMark;
     }
 
     public int getWriteSpinCount() {
         return writeSpinCount;
     }
 
     public void setWriteSpinCount(int writeSpinCount) {
         if (writeSpinCount <= 0) {
             throw new IllegalArgumentException(
                     "writeSpinCount must be a positive integer.");
         }
         this.writeSpinCount = writeSpinCount;
     }
 }