我正在构建一个将订单路由到订单管理系统的示例实现。入站路由是具有两个标识符的交换，一个用于客户ID，一个用于目录项ID。然后我将入站交换的主体转换为我的Order域对象。我的目标是调用内容丰富模式，一次聚合来自客户的数据，一次聚合来自目录项的数据。
我的路线是：
@Override
public void configure() {
// Start by building an instance of RestConfigurationDefinition. Need to
// specify the component we are going to use for enabling REST endpoints,
// specifically CamelServlet in this case. Set the binding mode to JSON.
restConfiguration().
// Leverage the CamelServlet component for the REST DSL
component("servlet").
// Bind using JSON
bindingMode(RestBindingMode.json).
// I like pretty things...
dataFormatProperty("prettyPrint", "true").
// This is the context path to be used for Swagger API documentation
apiContextPath("api-doc").
// Properties for Swagger
// Title of the API
apiProperty("api.title", "Order Management API").
// Version of the API
apiProperty("api.version", "1.0.0").
// CORS (resource sharing) enablement
apiProperty("cors", "true").
// Use localhost for calls
apiProperty("host", "localhost:8083").
// Set base path
apiProperty("base.path", "nvisia-order-router-camel-service/api");
// Definition of the post order endpoint
rest("/orderRouter").
// This is a POST method call for routing an order using the
// order form
post().
// Description of what the method does
description("Routes a new order to the order management service").
// Define the type used for input
type(OrderForm.class).
// Define the type used for output, in this case the order
outType(String.class).
// Next, define where the message is routed to, first transformation
to("bean:orderRouterService?method=transformOrderFormToOrder(${body})")
.to("direct:enrichOrder");
// Definition of the enrich order endpoint
from("direct:enrichOrder").
// Use the Content Enricher EIP to aggregate customer info in the
// order.
enrich(
"http4://localhost:8081/nvisia-customer-camel-service/api/customer/${body.customerId}",
new AggregationStrategy() {
@Override
public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
Order originalBody = (Order) oldExchange.getIn().getBody();
Customer resourceResponse = (Customer) newExchange.getIn().getBody();
originalBody.setCustomer(resourceResponse);
if (oldExchange.getPattern().isOutCapable()) {
oldExchange.getOut().setBody(originalBody);
} else {
oldExchange.getIn().setBody(originalBody);
}
return oldExchange;
}
}).
// Use the Content Enricher EIP to aggregate catalog info in the
// order.
enrich(
"http4://localhost:8080/nvisia-catalog-camel-service/api/customer/${body.catalogItemId}",
new AggregationStrategy() {
@Override
public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
Order originalBody = (Order) oldExchange.getIn().getBody();
CatalogItem resourceResponse = (CatalogItem) newExchange.getIn()
.getBody();
originalBody.setCatalogItem(resourceResponse);
if (oldExchange.getPattern().isOutCapable()) {
oldExchange.getOut().setBody(originalBody);
} else {
oldExchange.getIn().setBody(originalBody);
}
return oldExchange;
}
}).to("direct:sendOrder");
// Definition of the send order endpoint
from("direct:sendOrder").
// Need to define the content type on the header
setHeader(org.apache.camel.Exchange.CONTENT_TYPE,
constant("application/json"))
.
// Be safe and define this as a post
setHeader(Exchange.HTTP_METHOD,
constant(org.apache.camel.component.http4.HttpMethods.POST))
.
// Finally, send the order to be managed and get back the order ID
to("http4://localhost:8082/nvisia-order-management-camel-service/api/order");
}
我得到的例外是：
org.apache.camel.InvalidPayloadException: No body available of type: java.io.InputStream but has value: OrderForm [customerId=1, catalogItemId=1] of type: com.nvisia.examples.camel.orderrouter.OrderForm on: Message[]. Caused by: No type converter available to convert from type: com.nvisia.examples.camel.orderrouter.OrderForm to the required type: java.io.InputStream with value OrderForm [customerId=1, catalogItemId=1]. Exchange[ID-nvisia-mhoffman-50981-1463522552963-0-8]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: com.nvisia.examples.camel.orderrouter.OrderForm to the required type: java.io.InputStream with value OrderForm [customerId=1, catalogItemId=1]]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:107)
at org.apache.camel.component.http4.HttpProducer.createRequestEntity(HttpProducer.java:523)
at org.apache.camel.component.http4.HttpProducer.createMethod(HttpProducer.java:422)
at org.apache.camel.component.http4.HttpProducer.process(HttpProducer.java:110)
at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
at org.apache.camel.processor.Enricher.process(Enricher.java:187)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:468)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:121)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62)
at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:145)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:468)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:121)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:87)
at org.apache.camel.http.common.CamelServlet.service(CamelServlet.java:143)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:261)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:115)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.boot.context.web.ErrorPageFilter.doFilter(ErrorPageFilter.java:120)
at org.springframework.boot.context.web.ErrorPageFilter.access$000(ErrorPageFilter.java:61)
at org.springframework.boot.context.web.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:95)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.boot.context.web.ErrorPageFilter.doFilter(ErrorPageFilter.java:113)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: com.nvisia.examples.camel.orderrouter.OrderForm to the required type: java.io.InputStream with value OrderForm [customerId=1, catalogItemId=1]
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:198)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:105)
... 79 more
注意我使用的是最新的骆驼，2.17.1。我的问题是，如果我正在进行身体是JSON格式的交换，我如何使两个内容更丰富的调用来填充我的Order bean？由于我不需要向任何内容丰富的呼叫发送输入流，因此我认为在每次交换之前都有一个处理器，但我认为第二次聚合将难以保持来自第一次聚合的信息。如果这不是推荐使用内容丰富的方式，请告诉我。
答案 0 :(得分：0)
我能够通过远离使用内容丰富而无需使用具有两个直接端点的多播来解决这个问题。我还需要明确解组和编组，这也导致了一些其他问题。这是我用过的最终路线，以防它对其他人有用。
// Definition of the post order endpoint
rest("/orderRouter")
// This is a POST method call for routing an order using the order
// form
.post()
// Description of what the method does
.description("Routes a new order to the order management service")
// Define the type used for input
.type(OrderForm.class)
// Define the type used for output, in this case the order
.outType(OrderNumber.class)
// Now, process the order
.to("direct:processOrder");
// This is the route that processes the order sent. First, we need to take
// the data from the order form passed, put it in the header and empty out
// the body of our incoming exchange.
from("direct:processOrder")
// Set header for customer ID
.setHeader("customerId", simple("${body.customerId}"))
// Set header for catalog item ID
.setHeader("catalogItemId", simple("${body.catalogItemId}"))
// Empty the body
.setBody(constant(""))
// Now, aggregate the data to an order type
.end()
// Use multicasting to call the customer and catalog item services
// in parallel. Then, use a strategy that groups the exchanges
// returned from the service calls into a single list for
// processing.
.multicast(new GroupedExchangeAggregationStrategy())
// Use parallel processing
.parallelProcessing()
// Send to two direct components to get the data
.to("direct:getCustomerData", "direct:getCatalogItemData")
// End the multicast call
.end()
// Now process the exchange
.process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
List<Exchange> exchanges = exchange.getIn().getBody(List.class);
Order order = new Order();
for (Exchange exchangeToProcess : exchanges) {
if (exchangeToProcess.getIn().getBody() instanceof Customer) {
order.setCustomer(
exchangeToProcess.getIn().getBody(Customer.class));
} else if (exchangeToProcess.getIn()
.getBody() instanceof CatalogItem) {
order.setCatalogItem(
exchangeToProcess.getIn().getBody(CatalogItem.class));
} else {
// Ignore it for now.
}
}
order.setOrderDate(new Date(System.currentTimeMillis()));
exchange.getIn().setBody(order);
}
})
// End this processor definition
.end()
// Need to marshal the body to JSON
.marshal()
// Need to use JSON for marshalling
.json(JsonLibrary.Jackson)
// Then convert it to a string
.convertBodyTo(String.class)
// We can now send the order to order management. Need to define the
// content type on the header
.setHeader(org.apache.camel.Exchange.CONTENT_TYPE,
constant("application/json"))
// Be safe and define this as a post
.setHeader(Exchange.HTTP_METHOD,
constant(org.apache.camel.component.http4.HttpMethods.POST))
// Set the HTTP uri to be used.
.setHeader("CamelHttpUri", simple(
"http://localhost:8082/nvisia-order-management-camel-service/api/order"))
// Finally, send the order to be managed and get back the order ID
.to("http4://localhost:8082/nvisia-order-management-camel-service/api/order")
// Next, convert the input stream returned to a string
.convertBodyTo(String.class)
// Finally, unmarshal the string to an object
.unmarshal().json(JsonLibrary.Jackson, OrderNumber.class);
// Retrieves the customer data from the REST service for customer.
from("direct:getCustomerData")
// Set the http method as GET
.setHeader("CamelHttpMethod", constant("GET"))
// Set the HTTP uri to be used.
.setHeader("CamelHttpUri", simple(
"http://localhost:8081/nvisia-customer-camel-service/api/customer/${header.customerId}"))
// Define the endpoint; though, url will be ignored in favor of
// header
.to("http4://localhost:8081/nvisia-customer-camel-service/api/customer/${header.customerId}")
// Next, convert the input stream returned to a string
.convertBodyTo(String.class)
// Finally, unmarshal the string to an object
.unmarshal().json(JsonLibrary.Jackson, Customer.class);
// Retrieves the catalog item data from the REST service for catalog
// items.
from("direct:getCatalogItemData")
// Set the http method as GET
.setHeader("CamelHttpMethod", constant("GET"))
// Set the HTTP uri to be used.
.setHeader("CamelHttpUri", simple(
"http://localhost:8080/nvisia-catalog-camel-service/api/catalogItem/${header.catalogItemId}"))
// Define the endpoint; though, url will be ignored in favor of
// header
.to("http4://localhost:8080/nvisia-catalog-camel-service/api/catalogItem/${header.catalogItemId}")
// Next, convert the input stream returned to a string
.convertBodyTo(String.class)
// Finally, unmarshal the string to an object
.unmarshal().json(JsonLibrary.Jackson, CatalogItem.class);
答案 1 :(得分：0)
使用填充的选项类似于Integration Pattern
不要直接在http4中使用enrich
<enrich strategyRef="myAgregator">
<simple>http4://foo-url/</simple> <!-- InvalidPayloadException -->
</enrich>
因此，可与direct uri间接使用：
<camel:route id="consume-service1">
<from uri="direct:consume-service1" />
<camel:removeHeaders pattern="CamelHttp*" />
<to uri="http4://order-service/" />
<unmarshal ref="orderJson" />
<enrich strategyRef="myAgregator">
<simple>direct:consume-service2</simple>
</enrich>
<marshal ref="myJson" />
</camel:route>
<camel:route id="consume-service2">
<from uri="direct:consume-service2" />
<camel:setBody><constant></constant></camel:setBody>
<camel:removeHeaders pattern="CamelHttp*" />
<to uri="http4://catalog-service" />
<unmarshal ref="catalogJson" />
</camel:route>