001/*
002 * Copyright 2013 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.springframework.batch.core.jsr.step.builder;
017
018import javax.batch.api.partition.PartitionReducer;
019
020import org.springframework.batch.core.Step;
021import org.springframework.batch.core.jsr.step.PartitionStep;
022import org.springframework.batch.core.partition.support.SimpleStepExecutionSplitter;
023import org.springframework.batch.core.partition.support.TaskExecutorPartitionHandler;
024import org.springframework.batch.core.step.builder.PartitionStepBuilder;
025import org.springframework.batch.core.step.builder.StepBuilderException;
026import org.springframework.batch.core.step.builder.StepBuilderHelper;
027import org.springframework.core.task.SyncTaskExecutor;
028
029/**
030 * An extension of the {@link PartitionStepBuilder} that uses {@link PartitionStep}
031 * so that JSR-352 specific semantics are honored.
032 *
033 * @author Michael Minella
034 * @since 3.0
035 */
036public class JsrPartitionStepBuilder extends PartitionStepBuilder {
037
038        private PartitionReducer reducer;
039
040        /**
041         * @param parent parent step builder for basic step properties
042         */
043        public JsrPartitionStepBuilder(StepBuilderHelper<?> parent) {
044                super(parent);
045        }
046
047        /**
048         * @param reducer used to provide a single callback at the beginning and end
049         * of a partitioned step.
050         *
051         * @return this
052         */
053        public JsrPartitionStepBuilder reducer(PartitionReducer reducer) {
054                this.reducer = reducer;
055                return this;
056        }
057
058        @Override
059        public JsrPartitionStepBuilder step(Step step) {
060                super.step(step);
061                return this;
062        }
063
064        @Override
065        public Step build() {
066                PartitionStep step = new PartitionStep();
067                step.setName(getName());
068                super.enhance(step);
069
070                if (getPartitionHandler() != null) {
071                        step.setPartitionHandler(getPartitionHandler());
072                }
073                else {
074                        TaskExecutorPartitionHandler partitionHandler = new TaskExecutorPartitionHandler();
075                        partitionHandler.setStep(getStep());
076                        if (getTaskExecutor() == null) {
077                                taskExecutor(new SyncTaskExecutor());
078                        }
079                        partitionHandler.setGridSize(getGridSize());
080                        partitionHandler.setTaskExecutor(getTaskExecutor());
081                        step.setPartitionHandler(partitionHandler);
082                }
083
084                if (getSplitter() != null) {
085                        step.setStepExecutionSplitter(getSplitter());
086                }
087                else {
088
089                        boolean allowStartIfComplete = isAllowStartIfComplete();
090                        String name = getStepName();
091                        if (getStep() != null) {
092                                try {
093                                        allowStartIfComplete = getStep().isAllowStartIfComplete();
094                                        name = getStep().getName();
095                                }
096                                catch (Exception e) {
097                                        logger.info("Ignored exception from step asking for name and allowStartIfComplete flag. "
098                                                        + "Using default from enclosing PartitionStep (" + name + "," + allowStartIfComplete + ").");
099                                }
100                        }
101                        SimpleStepExecutionSplitter splitter = new SimpleStepExecutionSplitter();
102                        splitter.setPartitioner(getPartitioner());
103                        splitter.setJobRepository(getJobRepository());
104                        splitter.setAllowStartIfComplete(allowStartIfComplete);
105                        splitter.setStepName(name);
106                        splitter(splitter);
107                        step.setStepExecutionSplitter(splitter);
108
109                }
110
111                if (getAggregator() != null) {
112                        step.setStepExecutionAggregator(getAggregator());
113                }
114
115                if(reducer != null) {
116                        step.setPartitionReducer(reducer);
117                }
118
119                try {
120                        step.afterPropertiesSet();
121                }
122                catch (Exception e) {
123                        throw new StepBuilderException(e);
124                }
125
126                return step;
127
128        }
129}