spring-batch MaxValueFlowExecutionAggregator 源码
spring-batch MaxValueFlowExecutionAggregator 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/job/flow/support/state/MaxValueFlowExecutionAggregator.java
/*
* Copyright 2006-2013 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.job.flow.support.state;
import java.util.Collection;
import java.util.Collections;
import org.springframework.batch.core.job.flow.FlowExecution;
import org.springframework.batch.core.job.flow.FlowExecutionStatus;
/**
* Implementation of the {@link FlowExecutionAggregator} interface that aggregates
* {@link FlowExecutionStatus}', using the status with the high precedence as the
* aggregate status. See {@link FlowExecutionStatus} for details on status precedence.
*
* @author Dave Syer
* @since 2.0
*/
public class MaxValueFlowExecutionAggregator implements FlowExecutionAggregator {
/**
* Aggregate all of the {@link FlowExecutionStatus}es of the {@link FlowExecution}s
* into one status. The aggregate status will be the status with the highest
* precedence.
*
* @see FlowExecutionAggregator#aggregate(Collection)
*/
@Override
public FlowExecutionStatus aggregate(Collection<FlowExecution> executions) {
if (executions == null || executions.size() == 0) {
return FlowExecutionStatus.UNKNOWN;
}
return Collections.max(executions).getStatus();
}
}
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