/*
* Copyright 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
*
* 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.builder;
import javax.batch.api.partition.PartitionReducer;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.jsr.step.PartitionStep;
import org.springframework.batch.core.partition.support.SimpleStepExecutionSplitter;
import org.springframework.batch.core.partition.support.TaskExecutorPartitionHandler;
import org.springframework.batch.core.step.builder.PartitionStepBuilder;
import org.springframework.batch.core.step.builder.StepBuilderException;
import org.springframework.batch.core.step.builder.StepBuilderHelper;
import org.springframework.core.task.SyncTaskExecutor;
/**
* An extension of the {@link PartitionStepBuilder} that uses {@link PartitionStep}
* so that JSR-352 specific semantics are honored.
*
* @author Michael Minella
* @since 3.0
*/
public class JsrPartitionStepBuilder extends PartitionStepBuilder {
private PartitionReducer reducer;
/**
* @param parent parent step builder for basic step properties
*/
public JsrPartitionStepBuilder(StepBuilderHelper<?> parent) {
super(parent);
}
/**
* @param reducer used to provide a single callback at the beginning and end
* of a partitioned step.
*
* @return this
*/
public JsrPartitionStepBuilder reducer(PartitionReducer reducer) {
this.reducer = reducer;
return this;
}
@Override
public JsrPartitionStepBuilder step(Step step) {
super.step(step);
return this;
}
@Override
public Step build() {
PartitionStep step = new PartitionStep();
step.setName(getName());
super.enhance(step);
if (getPartitionHandler() != null) {
step.setPartitionHandler(getPartitionHandler());
}
else {
TaskExecutorPartitionHandler partitionHandler = new TaskExecutorPartitionHandler();
partitionHandler.setStep(getStep());
if (getTaskExecutor() == null) {
taskExecutor(new SyncTaskExecutor());
}
partitionHandler.setGridSize(getGridSize());
partitionHandler.setTaskExecutor(getTaskExecutor());
step.setPartitionHandler(partitionHandler);
}
if (getSplitter() != null) {
step.setStepExecutionSplitter(getSplitter());
}
else {
boolean allowStartIfComplete = isAllowStartIfComplete();
String name = getStepName();
if (getStep() != null) {
try {
allowStartIfComplete = getStep().isAllowStartIfComplete();
name = getStep().getName();
}
catch (Exception e) {
logger.info("Ignored exception from step asking for name and allowStartIfComplete flag. "
+ "Using default from enclosing PartitionStep (" + name + "," + allowStartIfComplete + ").");
}
}
SimpleStepExecutionSplitter splitter = new SimpleStepExecutionSplitter();
splitter.setPartitioner(getPartitioner());
splitter.setJobRepository(getJobRepository());
splitter.setAllowStartIfComplete(allowStartIfComplete);
splitter.setStepName(name);
splitter(splitter);
step.setStepExecutionSplitter(splitter);
}
if (getAggregator() != null) {
step.setStepExecutionAggregator(getAggregator());
}
if(reducer != null) {
step.setPartitionReducer(reducer);
}
try {
step.afterPropertiesSet();
}
catch (Exception e) {
throw new StepBuilderException(e);
}
return step;
}
}