/*
    * 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 com.github.dexecutor.core;
  
  import java.io.Serializable;
  import java.util.concurrent.Callable;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.github.dexecutor.core.TaskProvider;
  import com.github.dexecutor.core.TaskProvider.Task;
  import com.github.dexecutor.core.graph.Node;
  
  /**
   * A dexecutor task which terminates the graph execution after one retry 
   * 
   * @author Nadeem Mohammad
   *
   * @param <T> Node Id Type
   * @param <R> Result type
   */
  class RetryOnceAndTerminateTask<T extends Comparable<T>, R> implements Callable<Node<T, R>>, Serializable {
  	private static final long serialVersionUID = 1L;
  	private static final Logger logger = LoggerFactory.getLogger(RetryOnceAndTerminateTask.class);
  	private Node<T, R> node;
  	private TaskProvider<T, R> taskProvider;
  
  	public RetryOnceAndTerminateTask(final TaskProvider<T, R> taskProvider, final Node<T, R> graphNode) {
  		this.taskProvider = taskProvider;
  		this.node = graphNode;
  	}
  
  	public Node<T, R> call() throws Exception {
  		Task<T, R> task = new ExecutorTask<T, R>(node, this.taskProvider.provid(node.getValue()));
  		task.setConsiderExecutionError(false);
  		try {
  			task.execute();
  		} catch(Exception ex) {
  			logger.error("Exception caught, executing node # " + this.node.getValue() + " Retry would happen", ex);
  			task.setConsiderExecutionError(true);
  			task.execute();
  		}
  		return this.node;
  	}
  }