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/*
 * 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 zipkin2.server.internal;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/** Used to implement a context propagating executor service which wraps tasks */
// copy/pasted from Brave
public abstract class WrappingExecutorService implements ExecutorService {
  protected WrappingExecutorService() {
  }

  protected abstract ExecutorService delegate();

  protected abstract  Callable wrap(Callable task);

  protected abstract Runnable wrap(Runnable task);

  @Override public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
    return delegate().awaitTermination(timeout, unit);
  }

  @Override  public  List> invokeAll(Collection> tasks)
      throws InterruptedException {
    return delegate().invokeAll(wrap(tasks));
  }

  @Override public  List> invokeAll(Collection> tasks, long timeout,
      TimeUnit unit) throws InterruptedException {
    return delegate().invokeAll(wrap(tasks), timeout, unit);
  }

  @Override public  T invokeAny(Collection> tasks)
      throws InterruptedException, ExecutionException {
    return delegate().invokeAny(wrap(tasks));
  }

  @Override  public  T invokeAny(Collection> tasks, long timeout, TimeUnit unit)
      throws InterruptedException, ExecutionException, TimeoutException {
    return delegate().invokeAny(wrap(tasks), timeout, unit);
  }

  @Override public boolean isShutdown() {
    return delegate().isShutdown();
  }

  @Override public boolean isTerminated() {
    return delegate().isTerminated();
  }

  @Override public void shutdown() {
    delegate().shutdown();
  }

  @Override public List shutdownNow() {
    return delegate().shutdownNow();
  }

  @Override public void execute(Runnable task) {
    delegate().execute(wrap(task));
  }

  @Override public  Future submit(Callable task) {
    return delegate().submit(wrap(task));
  }

  @Override public Future submit(Runnable task) {
    return delegate().submit(wrap(task));
  }

  @Override public  Future submit(Runnable task, T result) {
    return delegate().submit(wrap(task), result);
  }

   Collection> wrap(Collection> tasks) {
    ArrayList> result = new ArrayList<>(tasks.size());
    for (Callable task : tasks) {
      result.add(wrap(task));
    }
    return result;
  }
}