spring-batch AmqpItemReaderBuilder 源码
spring-batch AmqpItemReaderBuilder 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/amqp/builder/AmqpItemReaderBuilder.java
/*
* Copyright 2017 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.amqp.builder;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.batch.item.amqp.AmqpItemReader;
import org.springframework.util.Assert;
/**
* A builder implementation for the {@link AmqpItemReader}
*
* @author Glenn Renfro
* @since 4.0
* @see AmqpItemReader
*/
public class AmqpItemReaderBuilder<T> {
private AmqpTemplate amqpTemplate;
private Class<? extends T> itemType;
/**
* Establish the amqpTemplate to be used by the AmqpItemReader.
* @param amqpTemplate the template to be used.
* @return this instance for method chaining
* @see AmqpItemReader#AmqpItemReader(AmqpTemplate)
*/
public AmqpItemReaderBuilder<T> amqpTemplate(AmqpTemplate amqpTemplate) {
this.amqpTemplate = amqpTemplate;
return this;
}
/**
* Establish the itemType for the reader.
* @param itemType class type that will be returned by the reader.
* @return this instance for method chaining.
* @see AmqpItemReader#setItemType(Class)
*/
public AmqpItemReaderBuilder<T> itemType(Class<? extends T> itemType) {
this.itemType = itemType;
return this;
}
/**
* Validates and builds a {@link AmqpItemReader}.
* @return a {@link AmqpItemReader}
*/
public AmqpItemReader<T> build() {
Assert.notNull(this.amqpTemplate, "amqpTemplate is required.");
AmqpItemReader<T> reader = new AmqpItemReader<>(this.amqpTemplate);
if (this.itemType != null) {
reader.setItemType(this.itemType);
}
return reader;
}
}
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