はい。これは 1 ステップで実行できます。以前にプロジェクトでこれを行ったことがあります。次の手順を実行できます。
1. ws1 and ws2 are both have "endpoints" defined in the ESB.
2. In the ws1 proxy, define a target inSequence to point to a "sequence"
for example "ws1InSequence"
3. In the "ws1InSequence", you can use <filter> to make sure the value is exists.
Then you can <send> to the ws1 <endpoint> with "receive" attribute point to
a sequence for example "ws1ResultSequence"
4. In the ws1ResultSequence, you can again use the <filter> to make sure
it has the parameter/value you need. Then you can use param/value to format a request message.
<payloadFactory>
<format>
<ns1: ws2Operation
xmlns:ns1="ws2Namespace">
<element1 xmlns="">$1</element1>
<!-- Note $1 will have the //paramName value from the ws1 Result message -->
<element2 xmlns="">$2</element2>
<!-- Note $2 will have the //paramName2 value from the ws1 Result message -->
</format>
<args>
<arg expression="//paramName" />
<arg expression="//paramName2" />
</args>
</payloadFactory>
5. Still in ws1ResultSequence, after you create the request message,
you <send> it to the ws2 proxy. Then in the ws2 proxy, in the <outSequence>
you can juse use <send/> to send the response to the client.
例外(faultSequence)処理を含める必要がある場合があることに注意してください。
WSO2ESB は構成に Apache Synapse を使用します。構文と使用例のほとんどは、ドキュメントで見つけることができます: http://synapse.apache.org/userguide/config.html
更新: これを例として使用できます。注、これは必要に応じて完成したコードではない可能性があり、例外処理を追加する必要がある場合があります。
<sequence xmlns="http://ws.apache.org/ns/synapse" name="ws1ResultSequence"
trace="enable" onError="ws1ResultSequenceErrorHandler">
<log level="custom">
<property name="sequence" value="INVOCATION START: ws1ResultSequence" />
</log>
<!-- record the original message for future reference -->
<enrich>
<source clone="true" type="envelope" />
<target action="replace" type="property" property="ORIGINAL" />
</enrich>
<!-- Check if the ws1 result message has the value -->
<property
xmlns:ns1="ws1Namespace"
name="valueExists" expression="//ns1:element1" />
<!--Note here, element1 is the element name which has the value: output1 -->
<filter xpath="fn:boolean( get-property('valueExists') )">
<then>
<!-- create the request message to invoke ws2 -->
<payloadFactory>
<format>
<ns1:ws2OperationName
xmlns:ns1="ws2Namespace">
<element2 xmlns="">$1</element2>
</ns1:ws2OperationName>
</format>
<args>
<arg expression="//ns1:element1" />
</args>
</payloadFactory>
<log level="custom">
<property name="inInvokeWS2" value="INVOCATION START: value from ws1 result exists" />
</log>
<send>
<endpoint key="ws2Sequence" />
</send>
<drop/>
</then>
</filter>
<!-- No result value found from the ws1 result message -->
<send>
<endpoint key="DoSomethingElseOrThrowError" />
</send>