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消息路由器
Spring 集成原生提供了专门的路由器类型,包括:
-
HeaderValueRouter
-
PayloadTypeRouter
-
ExceptionTypeRouter
-
RecipientListRouter
-
XPathRouter
与许多其他 DSL EIP 方法一样,该方法可以应用任何实现,或者为方便起见,可以应用作为 SPEL 表达式或 - 对。
此外,您还可以使用 lambda 进行配置,并将 lambda 用于 .
Fluent API 还提供 pairs 等选项,如下例所示:IntegrationFlowBuilder
route()
AbstractMessageRouter
String
ref
method
route()
Consumer<RouterSpec<MethodInvokingRouter>>
AbstractMappingMessageRouter
channelMapping(String key, String channelName)
@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();
}
以下示例显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();
}
该方法采用 ,如下例所示:routeToRecipients()
Consumer<RecipientListRouterSpec>
@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();
}
的 定义允许您将路由器设置为网关,以继续处理主流中不匹配的消息。.defaultOutputToParentFlow()
.routeToRecipients()
defaultOutput
另请参阅 Lambda 和 Message<?>
参数。