我们正在尝试一种方案，我们希望迭代节点列表，并使用每个单独的请求有效负载对某个服务进行POST调用。我们看到迭代中介实际上在该调用中发送了两个元素 这会导致API端出现问题。
我在本地部署了一个模拟服务，返回响应说：
<result>
<row>
<product_id>8351</product_id>
<event_key>17708</event_key>
<event_code>AEONBM</event_code>
<show_title>Some Show</show_title>
<venue_name>Eugene ONeill Theatre</venue_name>
<area>ORCHC</area>
<row>C</row>
<seat_num>103</seat_num>
<seat_increment>1</seat_increment>
<marketing_code>PREMIUM</marketing_code>
<Cost>352.0000</Cost>
</row>
<row>
<product_id>8351</product_id>
<event_key>17708</event_key>
<event_code>AEONBM</event_code>
<show_title>Some Show</show_title>
<venue_name>Eugene ONeill Theatre</venue_name>
<area>ORCHC</area>
<row>C</row>
<seat_num>104</seat_num>
<seat_increment>1</seat_increment>
<marketing_code>PREMIUM</marketing_code>
<Cost>352.0000</Cost>
</row
</result>
以下是我的代理服务的样子：
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="CreateListingFromGetLocation"
transports="https,http"
statistics="disable"
trace="disable"
startOnLoad="true">
<target>
<inSequence>
<log level="full">
<property name="text" value="Triggering getLocation API call.."/>
</log>
<send receive="createListingsFromGetLocationResponseSequence">
<endpoint>
<http method="get" uri-template="http://localhost:8989/GetLocation/"/>
</endpoint>
</send>
<property name="OUT_ONLY" value="true"/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
<description/>
</proxy>
这是我使用迭代介体的接收序列：
<sequence xmlns="http://ws.apache.org/ns/synapse" name="createListingsFromGetLocationResponseSequence">
<iterate xmlns:tem="http://tempuri.org" xmlns:ns="http://org.apache.synapse/xsd" expression="//result/row">
<target>
<sequence>
<log level="full">
<property name="LocationRow" value="Row element from GetLocationResponse"></property>
</log>
<payloadFactory media-type="xml">
<format>
<listing xmlns="">
<eventId>$1</eventId>
<eventDescription>$2</eventDescription>
<pricePerTicket>
<amount>$3</amount>
<currency>USD</currency>
</pricePerTicket>
<quantity>$4</quantity>
<section>$5</section>
<rows>$6</rows>
<seats>$7</seats>
<splitOption>NONE</splitOption>
</listing>
</format>
<args>
<arg expression="//event_key" evaluator="xml"></arg>
<arg expression="//show_title" evaluator="xml"></arg>
<arg expression="//Cost" evaluator="xml"></arg>
<arg expression="//seat_increment" evaluator="xml"></arg>
<arg expression="//area" evaluator="xml"></arg>
<arg expression="//row/row" evaluator="xml"></arg>
<arg expression="//seat_num" evaluator="xml"></arg>
</args>
</payloadFactory>
<log level="full">
<property name="ListingRequest" value="Listing request xml"></property>
</log>
<property name="Content-Type" value="application/xml" scope="transport" type="STRING"></property>
<property name="messageType" value="application/xml" scope="transport" type="STRING"></property>
<property name="TARGET_HOST" value="srwd30" scope="transport" type="STRING"></property>
<property name="HTTP_METHOD" value="POST" scope="transport" type="STRING"></property>
<send>
<endpoint>
<http format="pox" method="post" uri-template="http://www.srwd30.com/listings/v1/"></http>
</endpoint>
</send>
</sequence>
</target>
</iterate>
</sequence>
首先，我看到它正在迭代每个xml节点，这里有一些日志表明：
[2014-04-22 13:29:42,020] INFO - LogMediator To: http://www.w3.org/2005/08/addressing/anonymous, WSAction: , SOAPAction: , MessageID: urn:uuid:3bc14a33-3a7a-478e-bdbf-720f1ec855a5, Direction: response, LocationRow = Row element from GetLocationResponse, Envelope: <?xml version="1.0" encoding="utf-8
"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><row>
<product_id>8351</product_id>
<event_key>17708</event_key>
<event_code>AEONBM</event_code>
<show_title>Some Show</show_title>
<venue_name>Eugene ONeill Theatre</venue_name>
<area>ORCHC</area>
<row>D</row>
<seat_num>103</seat_num>
<seat_increment>1</seat_increment>
<marketing_code>PREMIUM</marketing_code>
<Cost>352.0000</Cost>
</row></soapenv:Body></soapenv:Envelope>
[2014-04-22 13:29:42,021] INFO - LogMediator To: http://www.w3.org/2005/08/addressing/anonymous, WSAction: , SOAPAction: , MessageID: urn:uuid:0e04ac15-a0bf-41a3-a7d7-80a1401d3efc, Direction: response, ListingRequest = Listing request xml, Envelope: <?xml version="1.0" encoding="utf-8"?><soapenv:En
velope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><listing><eventId>17708</eventId><eventDescription>Some Show</eventDescription><pricePerTicket><amount>352.0000</amount><currency>USD</currency></pricePerTicket><quantity>1</quantity><section>ORCHC</section><rows
>C</rows><seats>103</seats><splitOption>NONE</splitOption></listing></soapenv:Body></soapenv:Envelope>
但在我的API上，我发现我们正在接收重复或两个根节点：
Content-Type: application/xml
Headers: {cache-control=[no-cache], connection=[Keep-Alive],
content-type=[application/xml], host=[www.srwd30.com], http_method=[POST], messagetype=[application/xml], target_host=[srwd30], transfer-encoding=
[chunked], user-agent=[Synapse-PT-HttpComponents-NIO]}
Payload: <listing><eventId>17708</eventId><eventDescription>Some Show</eventDescription><pricePerTicket><amount>352.0000</amount><currency>USD</currenc
y></pricePerTicket><quantity>1</quantity><section>ORCHC</section><rows>C</rows><seats>103</seats><splitOption>NONE</splitOption></listing><listing><eventId>1770
8</eventId><eventDescription>Some Show</eventDescription><pricePerTicket><amount>352.0000</amount><currency>USD</currency></pricePerTicket><quantity>1<
/quantity><section>ORCHC</section><rows>D</rows><seats>104</seats><splitOption>NONE</splitOption></listing>
--------------------------------------
2014-04-22 19:01:51,468 [e14f#fbf/http://www.srwd30.com/listings/v1/] priority=WARN app_name=shared-stubhubjobs thread=http-0.0.0.0-
8080-8 location=AbstractJAXBProvider line=112 javax.xml.bind.UnmarshalException
- with linked exception:
[com.ctc.wstx.exc.WstxParsingException: Illegal to have multiple roots (start tag in epilog?).
at [row,col {unknown-source}]: [1,291]]
从它的外观来看，迭代器在发出调用时发送了两个元素。我错过了什么或做错了什么？如何使每个呼叫独立于其他呼叫？
答案 0 :(得分：1)
我通过使用urn：为该标头的测试值添加Action标头来解决问题。我意识到这导致发送重复的请求，有时只发送一个请求，即使迭代器有大约10条记录。
<proxy name="PushInventory"
transports="https http"
startOnLoad="true"
trace="disable">
<description/>
<target>
<inSequence>
<log level="full">
<property name="STATUS"
value="+++++++++++++++++ Inside PushInventory Proxy Service ++++++++++++++++++"/>
</log>
<iterate xmlns:tem="http://tempuri.org"
xmlns:ns="http://org.apache.synapse/xsd"
id="pushInventoryIterator"
expression="//result/row"
sequential="true">
<target>
<sequence>
<payloadFactory media-type="xml">
<format>
<listing xmlns="">
<eventId>$1</eventId>
<eventDescription>$2</eventDescription>
<pricePerTicket>
<amount>$3</amount>
<currency>USD</currency>
</pricePerTicket>
<quantity>$4</quantity>
<section>$5</section>
<rows>$6</rows>
<seats>$7</seats>
<splitOption>NONE</splitOption>
</listing>
</format>
<args>
<arg evaluator="xml" expression="//event_key"/>
<arg evaluator="xml" expression="//show_title"/>
<arg evaluator="xml" expression="//Cost"/>
<arg evaluator="xml" expression="//seat_increment"/>
<arg evaluator="xml" expression="//area"/>
<arg evaluator="xml" expression="//row_desc"/>
<arg evaluator="xml" expression="//seat_num"/>
</args>
</payloadFactory>
<log level="full">
<property name="STATUS"
value="++++++++++++ Invoking Listing EndPoint ++++++++++++++"/>
</log>
<property name="Authorization"
value="Basic dafdsfadsfdsafdsfdsafdsafsdfadsf"
scope="transport"
type="STRING"/>
<property name="Content-Type"
value="application/xml"
scope="transport"
type="STRING"/>
<property name="messageType"
value="application/xml"
scope="axis2"
type="STRING"/>
<property name="HTTP_METHOD" value="POST" scope="transport" type="STRING"/>
<header name="Action" scope="default" value="urn:test"/>
<send>
<endpoint key="ListingEndPoint"/>
</send>
</sequence>
</target>
</iterate>
</inSequence>
<outSequence>
<log level="full">
<property name="STATUS"
value="+++++++++++++++++ Inside OutSequence of PushInventory ++++++++++++++++++"/>
</log>
<aggregate>
<completeCondition>
<messageCount min="10" max="10"/>
</completeCondition>
<onComplete xmlns:ns2="com.blah.blah" expression="//listing">
<log level="full" separator=",">
<property name="STATUS"
value="+++++++++++++++++ Aggregating responses back ++++++++++++++++++"/>
</log>
<enrich>
<source type="envelope" clone="true"/>
<target type="body"/>
</enrich>
<send/>
</onComplete>
</aggregate>
</outSequence>
</target>
</proxy>
答案 1 :(得分：0)
您将日志放在迭代器介体之前，并查看您从端点接收的内容。它可能包含重复的条目。然后在迭代中你有另一个日志中介。检查记录是否正确。