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   /*
    * Copyright 2013 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.util.concurrent;
  
  import io.netty.util.internal.ObjectUtil;
  
  import java.util.concurrent.Executor;
  
  /**
   * {@link Executor} which execute tasks in the callers thread.
   */
  public final class ImmediateExecutor implements Executor {
      public static final ImmediateExecutor INSTANCE = new ImmediateExecutor();
  
      private ImmediateExecutor() {
          // use static instance
      }
  
      @Override
      public void execute(Runnable command) {
          ObjectUtil.checkNotNull(command, "command").run();
      }
  }