content: /*
   * Copyright 2016-2020 Andres Almiray
   *
   * This file is part of Java Trove Examples
   *
   * Java Trove Examples is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * Java Trove Examples is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with Java Trove Examples. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.kordamp.javatrove.example02.util;
  
  import org.jdeferred.DeferredFutureTask;
  import org.jdeferred.Promise;
  
  import java.util.concurrent.CancellationException;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * @author Andres Almiray
   */
  public class DefaultCancellablePromise<D, F, P> extends DelegatingPromise<D, F, P> implements CancellablePromise<D, F, P> {
      private final DeferredFutureTask<D, P> futureTask;
  
      public DefaultCancellablePromise(Promise<D, F, P> delegate, DeferredFutureTask<D, P> futureTask) {
          super(delegate);
          this.futureTask = requireNonNull(futureTask, "Argument 'futureTask' must not be null");
      }
  
      @Override
      public void cancel() {
          try {
              futureTask.cancel(true);
          } catch (CancellationException expected) {
              // OK
          }
      }
  }
  