如何基于XML配置文件在WSO2 ESB中动态路由消息 [英] How to dynamically route message in WSO2 ESB based on XML configuration file

问题描述

我正在尝试基于存储为本地条目（key = mapping_id_ep_v1.xml）的XML代码段中的信息来路由消息。用于查找正确端点的id是消息正文的一部分。

I am trying to route a message based on information in a XML snippet stored as a local entry (key=mapping_id_ep_v1.xml). The id used to look-up the correct endpoint and it is part of the message body.

这是用于将ID映射到端点的XML代码段：

This is the XML snippet used to map id's to endpoints:

<mappings>
    <mapping id="ep_1">http://localhost:8280/services/ep_1</mapping>
    <mapping id="ep_2">http://localhost:8280/services/ep_2</mapping>
    <mapping id="ep_3">http://localhost:8280/services/ep_3</mapping>
<mappings>

我使用以下语句从正文中检索ID以查找端点：

I retrieve the id from the body to look-up the endpoint using the following statement:

<property name="LOOK-UP" expression="//controleFile/id" />

我可以按以下顺序使用以下条目将XML文件加载到属性文件中：

I can load the XML file into a property file using the following entry in a sequence:

<property name="MAPPING" expression="get-property('mapping_id_ep_v1.xml')" />

我使用以下语句记录属性：

I log the property using the following statement:

<log level="custom">
    <property name="Look-up" expression="get-property('LOOK-UP')" />
    <property name="Mapping" expression="get-property('MAPPING')" />
</log>

到目前为止很好。我还无法弄清楚如何从MAPPING属性中检索正确的端点。有人可以帮忙吗？

So far so good. I haven't been able to figure out how to retrieve the correct endpoint from the MAPPING property. Can anyone help out?

推荐答案

我用另一种方法解决了我的问题。

I solved my question using a different approach. It is in line with the answer given bij fipries.

在代理中，我添加了以下内容：

In the proxy I added the following:

 <property name="MAPPING" expression="get-property('mapping_id_ep_v1')" />
 <property name="LOOK_UP" expression="//controlFile/id" />
 <log level="custom">
    <property name="MAPPING" expression="get-property('MAPPING')" />
    <property name="LOOK_UP" expression="get-property('LOOK_UP')" />
 </log>
 <script language="js" key="testScript_2" function="getEndpointByID" />
 <log level="custom">
    <property name="EP" expression="get-property('EP')" />
 </log>

这是mapping_id_ep_v1的内容：

This is the contents of mapping_id_ep_v1:

<mappings>
    <mapping id="ep_1">http://localhost:8280/services/ep_1</mapping>
    <mapping id="ep_2">http://localhost:8280/services/ep_2</mapping>
    <mapping id="ep_3">http://localhost:8280/services/ep_3</mapping>
<mappings>

这是TestScript_2中的代码：

This is the code in TestScript_2:

<x>

  function getEndpointByID(mc) {
     var xml = new XML(mc.getProperty('MAPPING'));
     var look_up = new XML(mc.getProperty('LOOK_UP'));
     var ep = xml..mapping.(@id == look_up);
     mc.setProperty('EP', ep + '');
  }

</x>

代理将映射xml加载到属性中。此属性会在javascript代码中转换为XML，然后使用LOOK_UP检索正确的端点。

The proxy loads the mapping xml into a property. This property is converted to XML in the javascript code and then using LOOK_UP the correct endpoint is retrieved.

希望这对其他人有帮助。

Hope this helps someone else.

问候，尼基尔

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