/*
 * 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 org.apache.hadoop.ozone.lease;

import java.util.concurrent.Callable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class is responsible for executing the callbacks of a lease in case of
 * timeout.
 */
public class LeaseCallbackExecutor<T> implements Runnable {

  private static final Logger LOG =
      LoggerFactory.getLogger(LeaseCallbackExecutor.class);

  private final T resource;
  private final Callable<Void> callback;

  /**
   * Constructs LeaseCallbackExecutor instance with list of callbacks.
   *
   * @param resource
   *        The resource for which the callbacks are executed
   * @param callback
   *        Callback to be executed by this executor
   */
  public LeaseCallbackExecutor(T resource, Callable<Void> callback) {
    this.resource = resource;
    this.callback = callback;
  }

  @Override
  public void run() {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Executing callbacks for lease on {}", resource);
    }
    if (callback != null) {
      try {
        callback.call();
      } catch (Exception e) {
        LOG.warn("Exception while executing callback for lease on {}",
            resource, e);
      }
    }
  }
}
