content: /*
   * Copyright 1999-2020 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.adapter.jaxrs.future;
  
  import com.alibaba.csp.sentinel.AsyncEntry;
  
  import java.util.concurrent.*;
  
  /**
   * wrap Future to ensure entry exit
   * @author sea
   */
  public class FutureWrapper<V> implements Future<V> {
  
      AsyncEntry entry;
  
      Future<V> future;
  
      public FutureWrapper(AsyncEntry entry, Future<V> future) {
          this.entry = entry;
          this.future = future;
      }
  
      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
          try {
              return future.cancel(mayInterruptIfRunning);
          } finally {
              exitEntry();
          }
  
      }
  
      @Override
      public boolean isCancelled() {
          return future.isCancelled();
      }
  
      @Override
      public boolean isDone() {
          return future.isDone();
      }
  
      @Override
      public V get() throws InterruptedException, ExecutionException {
          try {
              return future.get();
          } finally {
              exitEntry();
          }
      }
  
      @Override
      public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
          try {
              return future.get(timeout, unit);
          } finally {
              exitEntry();
          }
      }
  
      private void exitEntry() {
          if (entry != null) {
              entry.exit();
          }
      }
  
  }
  