org.springframework.batch.core.partition.PartitionHandler.java Source code

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Here is the source code for org.springframework.batch.core.partition.PartitionHandler.java

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/*
 * Copyright 2006-2007 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.batch.core.partition;

import java.util.Collection;

import org.springframework.batch.core.StepExecution;
import org.springframework.batch.item.ExecutionContext;

/**
 * Interface defining the responsibilities of controlling the execution of a
 * partitioned {@link StepExecution}. Implementations will need to create a
 * partition with the {@link StepExecutionSplitter}, and then use an execution
 * fabric (grid, etc.), to execute the partitioned step. The results of the
 * executions can be returned raw from remote workers to be aggregated by the
 * caller.
 * 
 * @author Dave Syer
 * @since 2.0
 */
public interface PartitionHandler {

    /**
     * Main entry point for {@link PartitionHandler} interface. The splitter
     * creates all the executions that need to be farmed out, along with their
     * input parameters (in the form of their {@link ExecutionContext}). The
     * master step execution is used to identify the partition and group
     * together the results logically.
     * 
     * @param stepSplitter a strategy for generating a collection of
     * {@link StepExecution} instances
     * @param stepExecution the master step execution for the whole partition
     * @return a collection of completed {@link StepExecution} instances
     * @throws Exception if anything goes wrong. This allows implementations to
     * be liberal and rely on the caller to translate an exception into a step
     * failure as necessary.
     */
    Collection<StepExecution> handle(StepExecutionSplitter stepSplitter, StepExecution stepExecution)
            throws Exception;

}