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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.socksproxy;
17  
18  import io.netty.buffer.Unpooled;
19  import io.netty.channel.Channel;
20  import io.netty.channel.ChannelFutureListener;
21  
22  public final class SocksServerUtils {
23  
24      /**
25       * Closes the specified channel after all queued write requests are flushed.
26       */
27      public static void closeOnFlush(Channel ch) {
28          if (ch.isActive()) {
29              ch.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
30          }
31      }
32  
33      private SocksServerUtils() { }
34  }