content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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 accord.api;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.Executor;
  
  import accord.utils.async.AsyncCallbacks;
  import accord.utils.async.AsyncCallbacks.RunOrFail;
  import accord.utils.async.AsyncChain;
  import accord.utils.async.Cancellable;
  
  public interface AsyncExecutor extends Executor
  {
      // unlike execute, throws no exceptions, nor will not wrap the runnable
      default Cancellable execute(RunOrFail run)
      {
          return AsyncCallbacks.execute(this, run);
      }
  
      default boolean tryExecuteImmediately(Runnable run) { return false; }
  
      // Depending on this implementation this method may queue-jump, i.e. task submission order is not guaranteed.
      // Make sure this is semantically safe at all call-sites.
      default void executeMaybeImmediately(Runnable run)
      {
          if (!tryExecuteImmediately(run))
              execute(run);
      }
  
      AsyncChain<Void> chain(Runnable run);
      <V> AsyncChain<V> chain(Callable<V> call);
      <V> AsyncChain<V> flatChain(Callable<? extends AsyncChain<V>> call);
  }
  