/*
 * 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.phoenix.call;

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

/**
 * Helper class to run a Call with a set of {@link CallWrapper}
 */
public class CallRunner {

  /**
   * Helper {@link Callable} that also declares the type of exception it will throw, to help with
   * type safety/generics for java
   * @param <V> value type returned
   * @param <E> type of check exception thrown
   */
  public static interface CallableThrowable<V, E extends Exception> extends Callable<V> {
    @Override
    public V call() throws E;
  }

  private static final Logger LOGGER = LoggerFactory.getLogger(CallRunner.class);

  private CallRunner() {
    // no ctor for util class
  }

  public static <V, E extends Exception, T extends CallableThrowable<V, E>> V run(T call,
    CallWrapper... wrappers) throws E {
    try {
      for (CallWrapper wrap : wrappers) {
        wrap.before();
      }
      return call.call();
    } finally {
      // have to go in reverse, to match the before logic
      for (int i = wrappers.length - 1; i >= 0; i--) {
        try {
          wrappers[i].after();
        } catch (Exception e) {
          LOGGER.error("Failed to complete wrapper " + wrappers[i], e);
        }
      }
    }
  }
}
