es.fcs.batch.integration.chunk.SerializableChunkProcessor.java Source code

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Here is the source code for es.fcs.batch.integration.chunk.SerializableChunkProcessor.java

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package es.fcs.batch.integration.chunk;

/* Copyright 2004-2010 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.
 */

import java.io.Serializable;
import java.util.Date;

import org.springframework.batch.core.JobExecutionException;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.step.item.Chunk;
import org.springframework.batch.core.step.item.ChunkProcessor;
import org.springframework.batch.core.step.item.SimpleChunkProcessor;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemWriter;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
 * 
 * @author Alois Cochard
 */
public class SerializableChunkProcessor<I, O> implements ChunkProcessor<I>, InitializingBean, Serializable {

    private static final long serialVersionUID = 1L;

    private transient ItemProcessor<? super I, ? extends O> itemProcessor;

    private transient ItemWriter<? super O> itemWriter;

    private transient SimpleChunkProcessor<I, O> delegate;

    private Serializable itemProcessorSerializable;

    private Serializable itemWriterSerializable;

    private Date date = new Date();

    public SerializableChunkProcessor(ItemProcessor<? super I, ? extends O> itemProcessor,
            ItemWriter<? super O> itemWriter) {
        this.itemProcessor = itemProcessor;
        this.itemWriter = itemWriter;
        validate();
    }

    @SuppressWarnings("unused")
    private SerializableChunkProcessor() {

    }

    public void afterPropertiesSet() throws Exception {
        validate();
    }

    public void process(StepContribution contribution, Chunk<I> inputs) throws Exception {
        doInit();
        delegate.process(contribution, inputs);
    }

    public void setItemProcessor(ItemProcessor<? super I, ? extends O> itemProcessor) {
        this.itemProcessor = itemProcessor;
    }

    public void setItemWriter(ItemWriter<? super O> itemWriter) {
        this.itemWriter = itemWriter;
    }

    @SuppressWarnings("unchecked")
    private void doInit() throws JobExecutionException {
        if (delegate != null) {
            // Delegate is already initialized
            return;
        }

        // Initializing processor and writer
        if (itemWriter == null && itemWriterSerializable == null) {
            throw new JobExecutionException("No itemWriter defined");
        }
        if (itemProcessor == null && itemProcessorSerializable == null) {
            throw new JobExecutionException("No itemWriter defined");
        }
        if (itemWriter == null)
            itemWriter = (ItemWriter) itemWriterSerializable;
        if (itemProcessor == null)
            itemProcessor = (ItemProcessor) itemProcessorSerializable;

        // Initializing delegate
        delegate = new SimpleChunkProcessor<I, O>(itemProcessor, itemWriter);
    }

    private void validate() {
        Assert.notNull(itemProcessor, "itemProcessor is required");
        Assert.notNull(itemWriter, "itemWriter is required");
        Assert.isInstanceOf(Serializable.class, itemProcessor, "itemProcessor must implement Serializable");
        Assert.isInstanceOf(Serializable.class, itemWriter, "itemWriter must implement Serializable");
        itemProcessorSerializable = (Serializable) itemProcessor;
        itemWriterSerializable = (Serializable) itemWriter;
    }

}