spring-batch JmsItemReaderBuilder 源码
spring-batch JmsItemReaderBuilder 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/jms/builder/JmsItemReaderBuilder.java
/*
* Copyright 2017-2021 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
*
* https://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.item.jms.builder;
import jakarta.jms.Message;
import org.springframework.batch.item.jms.JmsItemReader;
import org.springframework.jms.core.JmsOperations;
import org.springframework.util.Assert;
/**
* Creates a fully qualified JmsItemReader.
*
* @author Glenn Renfro
* @author Mahmoud Ben Hassine
* @since 4.0
*/
public class JmsItemReaderBuilder<T> {
protected Class<? extends T> itemType;
protected JmsOperations jmsTemplate;
/**
* Establish the JMS template that will be used by the JmsItemReader.
* @param jmsTemplate a {@link JmsOperations} instance
* @return this instance for method chaining.
* @see JmsItemReader#setJmsTemplate(JmsOperations)
*/
public JmsItemReaderBuilder<T> jmsTemplate(JmsOperations jmsTemplate) {
this.jmsTemplate = jmsTemplate;
return this;
}
/**
* Set the expected type of incoming message payloads. Set this to {@link Message} to
* receive the raw underlying message.
* @param itemType the java class of the items to be delivered. Typically the same as
* the class parameter
* @return this instance for method chaining.
* @throws IllegalStateException if the message payload is of the wrong type.
* @see JmsItemReader#setItemType(Class)
*/
public JmsItemReaderBuilder<T> itemType(Class<? extends T> itemType) {
this.itemType = itemType;
return this;
}
/**
* Returns a fully constructed {@link JmsItemReader}.
* @return a new {@link JmsItemReader}
*/
public JmsItemReader<T> build() {
Assert.notNull(this.jmsTemplate, "jmsTemplate is required.");
JmsItemReader<T> jmsItemReader = new JmsItemReader<>();
jmsItemReader.setItemType(this.itemType);
jmsItemReader.setJmsTemplate(this.jmsTemplate);
return jmsItemReader;
}
}
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