jakarta.batch.api.partition.PartitionMapper Maven / Gradle / Ivy

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/*
 * Copyright 2012, 2020 International Business Machines Corp.
 * 
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package jakarta.batch.api.partition;

import jakarta.batch.api.partition.PartitionPlan;

/**
 * PartitionMapper receives control at the start of a partitioned 
 * execution.  A PartitionMapper is responsible to provide unique 
 * batch properties for each partition. 
 *
 */
public interface PartitionMapper {
	/**
	 * The mapPartitions method that receives control at the 
	 * start of partitioned step processing. The method 
	 * returns a PartitionPlan, which specifies the batch properties 
	 * for each partition.
	 * @return partition plan for a partitioned step.
	 * @throws Exception is thrown if an error occurs. 
	 */
	public PartitionPlan mapPartitions( ) throws Exception;
}