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消息路由器

QWen Plus 中英对照 Message Routers

Spring Integration 本地提供了专门的路由器类型,包括:

  • HeaderValueRouter

  • PayloadTypeRouter

  • ExceptionTypeRouter

  • RecipientListRouter

  • XPathRouter

与许多其他 DSL IntegrationFlowBuilder EIP 方法一样,route() 方法可以应用任何 AbstractMessageRouter 实现,或者为了方便起见,使用 String 作为 SpEL 表达式或 ref-method 对。此外,你可以使用 lambda 配置 route(),并为 Consumer<RouterSpec<MethodInvokingRouter>> 使用 lambda。流畅的 API 还提供了 AbstractMappingMessageRouter 选项,例如 channelMapping(String key, String channelName) 对,如下例所示:

@Bean
public IntegrationFlow routeFlowByLambda() {
return IntegrationFlow.from("routerInput")
.<Integer, Boolean>route(p -> p % 2 == 0,
m -> m.suffix("Channel")
.channelMapping(true, "even")
.channelMapping(false, "odd")
)
.get();
}
java

以下示例展示了一个简单的基于表达式的路由器:

@Bean
public IntegrationFlow routeFlowByExpression() {
return IntegrationFlow.from("routerInput")
.route("headers['destChannel']")
.get();
}
java

routeToRecipients() 方法接受一个 Consumer<RecipientListRouterSpec>,如下例所示:

@Bean
public IntegrationFlow recipientListFlow() {
return IntegrationFlow.from("recipientListInput")
.<String, String>transform(p -> p.replaceFirst("Payload", ""))
.routeToRecipients(r -> r
.recipient("thing1-channel", "'thing1' == payload")
.recipientMessageSelector("thing2-channel", m ->
m.getHeaders().containsKey("recipient")
&& (boolean) m.getHeaders().get("recipient"))
.recipientFlow("'thing1' == payload or 'thing2' == payload or 'thing3' == payload",
f -> f.<String, String>transform(String::toUpperCase)
.channel(c -> c.queue("recipientListSubFlow1Result")))
.recipientFlow((String p) -> p.startsWith("thing3"),
f -> f.transform("Hello "::concat)
.channel(c -> c.queue("recipientListSubFlow2Result")))
.recipientFlow(new FunctionExpression<Message<?>>(m ->
"thing3".equals(m.getPayload())),
f -> f.channel(c -> c.queue("recipientListSubFlow3Result")))
.defaultOutputToParentFlow())
.get();
}
java

.routeToRecipients() 定义中的 .defaultOutputToParentFlow() 可让你将路由器的 defaultOutput 设置为网关,以继续处理主流程中未匹配的消息。