/*
* Copyright 2013-2014 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
*
* 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 org.springframework.batch.core.jsr.step;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.batch.api.Decider;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.jsr.JsrStepExecution;
import org.springframework.batch.core.step.AbstractStep;
import org.springframework.batch.item.ExecutionContext;
/**
* Implements a {@link Step} to follow the rules for a decision state
* as defined by JSR-352. Currently does not support the JSR requirement
* to provide all of the last {@link javax.batch.runtime.StepExecution}s from
* a split.
*
* @author Michael Minella
* @since 3.0
*/
public class DecisionStep extends AbstractStep {
private final Decider decider;
/**
* @param decider a {@link Decider} implementation
*/
public DecisionStep(Decider decider) {
this.decider = decider;
}
@SuppressWarnings("unchecked")
@Override
protected void doExecute(StepExecution stepExecution) throws Exception {
ExecutionContext executionContext = stepExecution.getJobExecution().getExecutionContext();
List<javax.batch.runtime.StepExecution> stepExecutions = new ArrayList<javax.batch.runtime.StepExecution>();
if(executionContext.containsKey("batch.lastSteps")) {
List<String> stepNames = (List<String>) executionContext.get("batch.lastSteps");
for (String stepName : stepNames) {
StepExecution curStepExecution = getJobRepository().getLastStepExecution(stepExecution.getJobExecution().getJobInstance(), stepName);
stepExecutions.add(new JsrStepExecution(curStepExecution));
}
} else {
Collection<StepExecution> currentRunStepExecutions = stepExecution.getJobExecution().getStepExecutions();
StepExecution lastExecution = null;
if(stepExecutions != null) {
for (StepExecution curStepExecution : currentRunStepExecutions) {
if(lastExecution == null || (curStepExecution.getEndTime() != null && curStepExecution.getEndTime().after(lastExecution.getEndTime()))) {
lastExecution = curStepExecution;
}
}
stepExecutions.add(new JsrStepExecution(lastExecution));
}
}
try {
ExitStatus exitStatus = new ExitStatus(decider.decide(stepExecutions.toArray(new javax.batch.runtime.StepExecution[0])));
stepExecution.getJobExecution().setExitStatus(exitStatus);
stepExecution.setExitStatus(exitStatus);
if(executionContext.containsKey("batch.lastSteps")) {
executionContext.remove("batch.lastSteps");
}
} catch (Exception e) {
stepExecution.setTerminateOnly();
stepExecution.addFailureException(e);
throw e;
}
}
}