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/*
 * 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.flink.runtime.taskmanager;

import org.apache.flink.api.common.JobID;
import org.apache.flink.runtime.checkpoint.CheckpointMetrics;
import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;

/**
 * Responder for checkpoint acknowledge and decline messages in the {@link Task}.
 */
public interface CheckpointResponder {

	/**
	 * Acknowledges the given checkpoint.
	 *
	 * @param jobID
	 *             Job ID of the running job
	 * @param executionAttemptID
	 *             Execution attempt ID of the running task
	 * @param checkpointId
	 *             Meta data for this checkpoint
	 * @param checkpointMetrics
	 *             Metrics of this checkpoint
	 * @param subtaskState
	 *             State handles for the checkpoint
	 */
	void acknowledgeCheckpoint(
		JobID jobID,
		ExecutionAttemptID executionAttemptID,
		long checkpointId,
		CheckpointMetrics checkpointMetrics,
		TaskStateSnapshot subtaskState);

	/**
	 * Declines the given checkpoint.
	 *
	 * @param jobID Job ID of the running job
	 * @param executionAttemptID Execution attempt ID of the running task
	 * @param checkpointId The ID of the declined checkpoint
	 * @param cause The optional cause why the checkpoint was declined   
	 */
	void declineCheckpoint(
		JobID jobID,
		ExecutionAttemptID executionAttemptID,
		long checkpointId,
		Throwable cause);
}