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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    *   https://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.channel;
17  
18  import io.netty.util.internal.PlatformDependent;
19  import io.netty.util.internal.SuppressJava6Requirement;
20  import io.netty.util.internal.ThrowableUtil;
21  import io.netty.util.internal.UnstableApi;
22  
23  /**
24   * A {@link RuntimeException} which is thrown when an I/O operation fails.
25   */
26  public class ChannelException extends RuntimeException {
27  
28      private static final long serialVersionUID = 2908618315971075004L;
29  
30      /**
31       * Creates a new exception.
32       */
33      public ChannelException() {
34      }
35  
36      /**
37       * Creates a new exception.
38       */
39      public ChannelException(String message, Throwable cause) {
40          super(message, cause);
41      }
42  
43      /**
44       * Creates a new exception.
45       */
46      public ChannelException(String message) {
47          super(message);
48      }
49  
50      /**
51       * Creates a new exception.
52       */
53      public ChannelException(Throwable cause) {
54          super(cause);
55      }
56  
57      @UnstableApi
58      @SuppressJava6Requirement(reason = "uses Java 7+ RuntimeException.<init>(String, Throwable, boolean, boolean)" +
59              " but is guarded by version checks")
60      protected ChannelException(String message, Throwable cause, boolean shared) {
61          super(message, cause, false, true);
62          assert shared;
63      }
64  
65      static ChannelException newStatic(String message, Class<?> clazz, String method) {
66          ChannelException exception;
67          if (PlatformDependent.javaVersion() >= 7) {
68              exception = new StacklessChannelException(message, null, true);
69          } else {
70              exception = new StacklessChannelException(message, null);
71          }
72          return ThrowableUtil.unknownStackTrace(exception, clazz, method);
73      }
74  
75      private static final class StacklessChannelException extends ChannelException {
76          private static final long serialVersionUID = -6384642137753538579L;
77  
78          StacklessChannelException(String message, Throwable cause) {
79              super(message, cause);
80          }
81  
82          StacklessChannelException(String message, Throwable cause, boolean shared) {
83              super(message, cause, shared);
84          }
85  
86          // Override fillInStackTrace() so we not populate the backtrace via a native call and so leak the
87          // Classloader.
88  
89          @Override
90          public Throwable fillInStackTrace() {
91              return this;
92          }
93      }
94  }