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/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * 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 eu.stratosphere.nephele.protocols;

import java.io.IOException;

import eu.stratosphere.core.protocols.VersionedProtocol;
import eu.stratosphere.nephele.jobgraph.JobID;
import eu.stratosphere.nephele.services.accumulators.AccumulatorEvent;

/**
 * The accumulator protocol is implemented by the job manager. TaskManagers can
 * use it to send the collected accumulators and JobClients can use it to get
 * the final accumulator results after the job ended.
 */
public interface AccumulatorProtocol extends VersionedProtocol {

	/**
	 * Report accumulators that were collected in a task. Called by Task
	 * Manager, after the user code was executed but before the task status
	 * update is reported.
	 */
	void reportAccumulatorResult(AccumulatorEvent accumulatorEvent)
			throws IOException;

	/**
	 * Get the final accumulator results. Called by JobClient after the job
	 * ended.
	 */
	AccumulatorEvent getAccumulatorResults(JobID jobID) throws IOException;

}