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   /*
    * Copyright 2020 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.channel;
  
  import io.netty.util.internal.ThrowableUtil;
  
  import java.nio.channels.ClosedChannelException;
  
  /**
   * Cheap {@link ClosedChannelException} that does not fill in the stacktrace.
   */
  final class StacklessClosedChannelException extends ClosedChannelException {
  
      private static final long serialVersionUID = -2214806025529435136L;
  
      private StacklessClosedChannelException() { }
  
      @Override
      public Throwable fillInStackTrace() {
          // Suppress a warning since this method doesn't need synchronization
          return this;
      }
  
      /**
       * Creates a new {@link StacklessClosedChannelException} which has the origin of the given {@link Class} and method.
       */
      static StacklessClosedChannelException newInstance(Class<?> clazz, String method) {
          return ThrowableUtil.unknownStackTrace(new StacklessClosedChannelException(), clazz, method);
      }
  }