Spring Integration為集成系統所涉及的某些復雜性提供了非常好的抽象-Spring Integration從Integration的角度來看非常適合Facade的定義-簡化了對復雜底層系統的訪問。

為了說明這一點，請考慮一個簡單的系統，該系統僅接收一條消息，然后將其發送回大寫，稱其為Echo網關：

public interface EchoGateway { String echo(String message); }

并為此進行測試：

@Testpublic void testEcho() {String response = echoGateway.echo('Hello');assertThat(response, is('HELLO'));}

到目前為止聽起來很簡單，使用spring集成的實現將通過轉換為大寫字母并返回增強后的消息來接受“消息”并對其進行“轉換”。

<?xml version='1.0' encoding='UTF-8'?> <beans:beans xmlns='http://www.springframework.org/schema/integration'xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'xmlns:beans='http://www.springframework.org/schema/beans'xsi:schemaLocation='http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.1.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd'><channel id='requestChannel'/><gateway id='echoGateway' service-interface='rube.simple.EchoGateway' default-request-channel='requestChannel' /><transformer input-channel='requestChannel' expression='payload.toUpperCase()' /> </beans:beans>

做工精美！

Spring Integration的優點在于，即使Integration場景變得復雜，它呈現給應用程序的外觀仍然保持簡單，

考慮一個Rube Goldberg集成方案：

首先是描述旋流的圖表：

那么它到底是做什么的：

• 它接收到這樣的消息：“來自Spring整合的你好”，
• 將其拆分為單個單詞（您好，來自spring，integeg），
• 將每個單詞發送到ActiveMQ隊列，
• 從隊列中，單詞片段由濃縮器拾取以大寫每個單詞，
• 將響應放回響應隊列，
• 根據單詞的原始順序對其進行重新排序，
• 聚合成一個句子（“ HELLO FROM SPRING INTEG”），
• 返回到應用程序。

這是這種流程的Spring Integration配置的樣子：

<?xml version='1.0' encoding='UTF-8'?> <beans:beans xmlns='http://www.springframework.org/schema/integration'xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'xmlns:int-jms='http://www.springframework.org/schema/integration/jms'xmlns:beans='http://www.springframework.org/schema/beans'xsi:schemaLocation='http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.0.xsdhttp://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.1.xsdhttp://www.springframework.org/schema/integration/jms http://www.springframework.org/schema/integration/jms/spring-integration-jms-2.1.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd'><beans:import resource='broker.xml'/><channel id='requestChannel'><queue/> </channel><channel id='responseChannel'><queue/></channel><gateway id='echoGateway' service-interface='rube.complicated.EchoGateway' default-request-channel='requestChannel' default-reply-channel='responseChannel' default-reply-timeout='5000' /><channel id='toJmsOutbound'/><splitter input-channel='requestChannel' output-channel='toJmsOutbound' expression='payload.split('\s')'></splitter><channel id='sequenceChannel'></channel><int-jms:outbound-gateway request-channel='toJmsOutbound' reply-channel='sequenceChannel' request-destination='amq.outbound' extract-request-payload='true' /><channel id='enhanceMessageChannel'/><channel id='toReplyQueueChannel'/><int-jms:inbound-gateway request-channel='enhanceMessageChannel' request-destination='amq.outbound' reply-channel='toReplyQueueChannel'/><transformer input-channel='enhanceMessageChannel' expression='(payload + '').toUpperCase()' output-channel='toReplyQueueChannel'/><resequencer input-channel='sequenceChannel' output-channel='aggregateChannel' release-partial-sequences='false'></resequencer><aggregator input-channel='aggregateChannel' output-channel='responseChannel' expression='T(com.google.common.base.Joiner).on(' ').join(![payload].toArray())'/><poller id='poller' fixed-delay='500' default='true'/></beans:beans>

這個流程有太多的復雜性（因此Rube Goldberg），但是Spring Integration提供給應用程序的外觀仍然非常簡單。

@Testpublic void testEcho() throws Exception{String amessage = 'Hello from Spring Integration';String response = echoGateway.echo(amessage);assertThat(response, is('HELLO FROM SPRING INTEGRATION'));}

我認為這是Spring Integration的本質

我在https://github.com/bijukunjummen/rg-si.git上有此代碼的github存儲庫

參考： all和其他博客中的Rube Goldberg Spring Integration，來自我們的JCG合作伙伴 Biju Kunjummen。

翻譯自: https://www.javacodegeeks.com/2012/06/rube-goldberg-spring-integration_22.html

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