spring-batch RemoteChunkingWorkerBuilder 源码

spring-batch RemoteChunkingWorkerBuilder 代码

文件路径：/spring-batch-integration/src/main/java/org/springframework/batch/integration/chunk/RemoteChunkingWorkerBuilder.java

/*
 * Copyright 2018-2022 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.integration.chunk;

import org.springframework.batch.core.step.item.SimpleChunkProcessor;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.support.PassThroughItemProcessor;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.messaging.MessageChannel;
import org.springframework.util.Assert;

/**
 * Builder for a worker in a remote chunking setup. This builder:
 *
 * <ul>
 * <li>creates a {@link ChunkProcessorChunkHandler} with the provided item processor and
 * writer. If no item processor is provided, a {@link PassThroughItemProcessor} will be
 * used</li>
 * <li>creates an {@link IntegrationFlow} with the {@link ChunkProcessorChunkHandler} as a
 * service activator which listens to incoming requests on <code>inputChannel</code> and
 * sends replies on <code>outputChannel</code></li>
 * </ul>
 *
 * @param <I> type of input items
 * @param <O> type of output items
 * @since 4.1
 * @author Mahmoud Ben Hassine
 */
public class RemoteChunkingWorkerBuilder<I, O> {

	private static final String SERVICE_ACTIVATOR_METHOD_NAME = "handleChunk";

	private ItemProcessor<I, O> itemProcessor;

	private ItemWriter<O> itemWriter;

	private MessageChannel inputChannel;

	private MessageChannel outputChannel;

	/**
	 * Set the {@link ItemProcessor} to use to process items sent by the manager step.
	 * @param itemProcessor to use
	 * @return this builder instance for fluent chaining
	 */
	public RemoteChunkingWorkerBuilder<I, O> itemProcessor(ItemProcessor<I, O> itemProcessor) {
		Assert.notNull(itemProcessor, "itemProcessor must not be null");
		this.itemProcessor = itemProcessor;
		return this;
	}

	/**
	 * Set the {@link ItemWriter} to use to write items sent by the manager step.
	 * @param itemWriter to use
	 * @return this builder instance for fluent chaining
	 */
	public RemoteChunkingWorkerBuilder<I, O> itemWriter(ItemWriter<O> itemWriter) {
		Assert.notNull(itemWriter, "itemWriter must not be null");
		this.itemWriter = itemWriter;
		return this;
	}

	/**
	 * Set the input channel on which items sent by the manager are received.
	 * @param inputChannel the input channel
	 * @return this builder instance for fluent chaining
	 */
	public RemoteChunkingWorkerBuilder<I, O> inputChannel(MessageChannel inputChannel) {
		Assert.notNull(inputChannel, "inputChannel must not be null");
		this.inputChannel = inputChannel;
		return this;
	}

	/**
	 * Set the output channel on which replies will be sent to the manager step.
	 * @param outputChannel the output channel
	 * @return this builder instance for fluent chaining
	 */
	public RemoteChunkingWorkerBuilder<I, O> outputChannel(MessageChannel outputChannel) {
		Assert.notNull(outputChannel, "outputChannel must not be null");
		this.outputChannel = outputChannel;
		return this;
	}

	/**
	 * Create an {@link IntegrationFlow} with a {@link ChunkProcessorChunkHandler}
	 * configured as a service activator listening to the input channel and replying on
	 * the output channel.
	 * @return the integration flow
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public IntegrationFlow build() {
		Assert.notNull(this.itemWriter, "An ItemWriter must be provided");
		Assert.notNull(this.inputChannel, "An InputChannel must be provided");
		Assert.notNull(this.outputChannel, "An OutputChannel must be provided");

		if (this.itemProcessor == null) {
			this.itemProcessor = new PassThroughItemProcessor();
		}
		SimpleChunkProcessor<I, O> chunkProcessor = new SimpleChunkProcessor<>(this.itemProcessor, this.itemWriter);

		ChunkProcessorChunkHandler<I> chunkProcessorChunkHandler = new ChunkProcessorChunkHandler<>();
		chunkProcessorChunkHandler.setChunkProcessor(chunkProcessor);

		return IntegrationFlow.from(this.inputChannel).handle(chunkProcessorChunkHandler, SERVICE_ACTIVATOR_METHOD_NAME)
				.channel(this.outputChannel).get();
	}

}

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