org.jberet.camel.CamelItemWriter Maven / Gradle / Ivy
/*
* Copyright (c) 2016 Red Hat, Inc. and/or its affiliates.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cheng Fang - Initial API and implementation
*/
package org.jberet.camel;
import java.io.Serializable;
import java.util.List;
import javax.batch.api.chunk.ItemWriter;
import javax.enterprise.context.Dependent;
import javax.inject.Named;
import _private.JBeretCamelLogger;
import org.apache.camel.ProducerTemplate;
/**
* Implementation of {@code javax.batch.api.chunk.ItemWriter} that writes batch data
* to Apache Camel endpoint.
*
* The target Camel endpoint is configured through batch property
* {@code endpoint} in job XML. For example,
*
* <job id="camelWriterTest" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0">
* <step id="camelWriterTest.step1">
* <chunk>
* ... ...
* <writer ref="camelItemWriter">
* <properties>
* <property name="endpoint" value="#{jobParameters['endpoint']}"/>
* </properties>
* </writer>
* </chunk>
* </step>
* </job>
*
*
* @see CamelItemReader
* @see CamelItemProcessor
* @since 1.3.0
*/
@Named
@Dependent
public class CamelItemWriter extends CamelArtifactBase implements ItemWriter {
/**
* The Camel {@code ProducerTemplate} for writing data to the endpoint.
*/
protected ProducerTemplate producerTemplate;
/**
* {@inheritDoc}
*
* This method gets resources ready, such as {@link #producerTemplate}.
*
* @param checkpoint the last checkpoint
* @throws Exception if any errors occur
*/
@Override
public void open(final Serializable checkpoint) throws Exception {
init();
if (producerTemplate == null) {
producerTemplate = camelContext.createProducerTemplate();
}
JBeretCamelLogger.LOGGER.openWriter(this, endpointUri, camelContext, producerTemplate);
producerTemplate.start();
}
/**
* {@inheritDoc}
*
* This method closes any resources used by this class, such as {@link #producerTemplate}.
*
* @throws Exception
*/
@Override
public void close() throws Exception {
if (producerTemplate != null) {
producerTemplate.stop();
}
}
/**
* {@inheritDoc}
*
* This method writes the data {@code items} to the configured Camel endpoint.
*
* @param items the list of items to write
* @throws Exception if any errors occur
*/
@Override
public void writeItems(final List