spring-batch PartitionHandler 源码
spring-batch PartitionHandler 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/partition/PartitionHandler.java
/*
* Copyright 2006-2022 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
* @author Mahmoud Ben Hassine
* @author Taeik Lim
* @since 2.0
*/
@FunctionalInterface
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 manager 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 manager 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;
}
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