NoRestartRestartStrategy.java

/*
 * Copyright (C) 2012 Google Inc.
 *
 * 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
 *
 * 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 interactivespaces.util.process.restart;

/**
 * A restart strategy which refuses to try a restart within Interactive Spaces.
 *
 * @param <T>
 *          the type of {@link Restartable}
 *
 * @author Keith M. Hughes
 */
public class NoRestartRestartStrategy<T extends Restartable> extends BaseRestartStrategy<T> {

  @Override
  public RestartStrategyInstance<T> newInstance(T restartable) {
    NoRestartRestartStrategyInstance<T> instance = new NoRestartRestartStrategyInstance<T>(restartable, this);
    instance.startRestartAttempts();

    return instance;
  }

  /**
   * A {@link RestartStrategyInstance} which will never attempt a restart.
   *
   * @param <U>
   *          the type of {@link Restartable}
   *
   * @author Keith M. Hughes
   */
  private static class NoRestartRestartStrategyInstance<U extends Restartable> extends BaseRestartStrategyInstance<U> {

    /**
     * Construct a new instance.
     *
     * @param restartable
     *          the object being restarted
     * @param strategy
     *          the strategy this is an instance for
     */
    public NoRestartRestartStrategyInstance(U restartable, NoRestartRestartStrategy<U> strategy) {
      super(restartable, strategy, strategy.getListeners());
    }

    /**
     * Attempt the restart.
     */
    public void startRestartAttempts() {
      notifyRestartFailure();
      getRestartable().restartComplete(false);
    }

    @Override
    public void quit() {
      // Nothing to do.
    }

    @Override
    public boolean isRestarting() {
      // Restarts will never happen.
      return false;
    }
  }
}