跳过Jpos-template项目中的事务参与者的条件。

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英文:

conditionally skip transaction participant in my Jpos-template project

问题

I have multiple participants in my transaction manager config as below. I want to switch between UAT and LOCAL participants based on the object property that the current context holds (like if specific fields have specific values). How can I achieve this without having to change Java code and just modify the XML config? I am not sure if org.jpos.transaction.participant.JSParticipant is the way to go.

NOTE: I am simply using jpos-template project but not the Jpos-EE

<txnmgr class="org.jpos.transaction.TransactionManager" logger="Q2">
    <property name="queue" value="TXNMGR"/>
    <property name="sessions" value="10"/>
    <property name="max-sessions" value="100"/>
 
    <participant name="LOCAL" class="com.sanjok.qbean.RestParticipant">     
        <property name="server-signature-public-key"
                  value="***"/>
        <property name="server-encryption-public-key"
                  value="***"/>
        <property name="base64-client-signature-private-key"
                  value="***"/>
        <property name="base64-client-encryption-private-key"
                  value="***"/>				  
    </participant>
	
	 <participant name="UAT" class="com.sanjok.qbean.RestParticipant">     
        <property name="server-signature-public-key"
                  value="***"/>
        <property name="server-encryption-public-key"
                  value="***"/>
        <property name="base64-client-signature-private-key"
                  value="***"/>
        <property name="base64-client-encryption-private-key"
                  value="***"/>				  
    </participant>

    <participant class="org.jpos.transaction.participant.SendResponse">        
    </participant>
</txnmgr>
英文:

I have multiple participants in my transaction manager config as below. I want to switch between UAT and LOCAL participants based on the object property that the current context holds (like if specific fields have specific values). How can I achieve this without having to change Java code and just modify the XML config? I am not sure if org.jpos.transaction.participant.JSParticipant is the way to go.

NOTE: I am simply using jpos-template project but not the Jpos-EE

<txnmgr class="org.jpos.transaction.TransactionManager" logger="Q2">
    <property name="queue" value="TXNMGR"/>
    <property name="sessions" value="10"/>
    <property name="max-sessions" value="100"/>

 
    <participant name="LOCAL" class="com.sanjok.qbean.RestParticipant">     

        <property name="server-signature-public-key"
                  value="***"/>
        <property name="server-encryption-public-key"
                  value="***"/>
        <property name="base64-client-signature-private-key"
                  value="***"/>
        <property name="base64-client-encryption-private-key"
                  value="***"/>				  
    </participant>
	
	 <participant name="UAT" class="com.sanjok.qbean.RestParticipant">     

        <property name="server-signature-public-key"
                  value="***"/>
        <property name="server-encryption-public-key"
                  value="***"/>
        <property name="base64-client-signature-private-key"
                  value="***"/>
        <property name="base64-client-encryption-private-key"
                  value="***"/>				  
    </participant>

    <participant class="org.jpos.transaction.participant.SendResponse">        
    </participant>
</txnmgr>

答案1

得分: 1

以下是您要翻译的内容:

你可以在事务组中像这样使用 Switch 事务参与者:

  1. <CONTEXT_KEY_TO_SWITCH_ON> 是包含您想要选择目标的值的上下文键。
  2. <LOCAL_VALUE> 是应该使事务进入本地的该键的值。
  3. <UAT_VALUE> 是应该使事务进入UAT的该键的值。
  4. <DEFAULT_ENDPOINT_OR_ERROR_GROUP> 是如果前面的匹配项都不匹配时要前往的端点(或错误组,如果您想这样处理),类似于Java中的switch语句的default

Switch 事务参与者在 jPOS程序员指南 第9.8.1节中有文档记录。

基本上,我们是这样说的,如果键匹配 <LOCAL_VALUE>,则运行 LOCAL 组,如果匹配 <UAT_VALUE>,则运行 UAT 组,否则运行您在那里定义的任何组。每个组中的参与者在 Switch 参与者之后以及下一个参与者之前执行。

根据上下文对象的属性选择端点。

OP 在评论中要求能够根据请求的字段选择端点。为此,我们需要使用代码,它可以在脚本化的参与者中进行。

最好的选择是使用 GroovyParticipant,因为它可以预编译脚本,但由于OP未使用jPOS-EE,不清楚他是否不想使用,还是只是尚未使用但愿意尝试。

使用 BSHGroupSelector

最简单的选项是使用 BSHGroupSelector,因为我们只需要修改此XML中的 Switch 参与者:

  <participant class="org.jpos.transaction.participant.BSHGroupSelector">
    <select>
      import org.jpos.iso.*;
      ISOMsg m = context.get("REQUEST");
      String de3 = m.getString(3);
      result = (/*根据DE3选择UAT的条件*/) ?  "UAT" : "LOCAL";
    </select>
  </participant>

result 是由 GroupSelector 用于确定 select 方法的结果,即要运行的组。

使用 JSParticipant

我不知道如何编写具有 JSParticipantGroupSelector。但是,我们可以使用 JSParticipant 将字段3提取到上下文键中。我们需要在 Switch 参与者之前添加此参与者:

<participant class="org.jpos.transaction.participant.JSParticipant"
  logger="Q2" realm="js" src='cfg/extract-de3.js' />

其中 cfg/extract-de3.js 具有以下内容:

var K = Java.type("org.jpos.transaction.TransactionConstants");
var prepare = function(id, ctx) {
  // 将DE 3放入上下文的de3键下。  ctx.put("de3", 
  ctx.get("REQUEST").getString(3);
  return K.PREPARED;
}

Switch 参与者的定义如下:

    <participant class="org.jpos.transaction.participant.Switch"
      logger="Q2" realm="Switch">
      <property name="txnname" value="de3"/> 
      <property name="<LOCAL_VALUE>" value="LOCAL"/>                
      <property name="<UAT_VALUE>" value="UAT"/>                    
      <property name="unknown" value="<DEFAULT_ENDPOINT_OR_ERROR_GROUP>"/>
    </participant>
英文:

You can use a Switch transaction participant with transaction groups like this:

<txnmgr class="org.jpos.transaction.TransactionManager" logger="Q2">
    <property name="queue" value="TXNMGR"/>
    <property name="sessions" value="10"/>
    <property name="max-sessions" value="100"/>

    <participant class="org.jpos.transaction.participant.Switch"
      logger="Q2" realm="Switch">
      <property name="txnname" value="<CONTEXT_KEY_TO_SWITCH_ON>"/> <!--1-->
      <property name="<LOCAL_VALUE>" value="LOCAL"/>                <!--2-->
      <property name="<UAT_VALUE>" value="UAT"/>                    <!--3-->
      <property name="unknown" value="<DEFAULT_ENDPOINT_OR_ERROR_GROUP>"/>  <!--4-->
    </participant>
    <group name="LOCAL">
        <participant name="LOCAL" class="com.sanjok.qbean.RestParticipant">     
...
       </participant>
     </group>    
     <group name="UAT">
       <participant name="UAT" class="com.sanjok.qbean.RestParticipant">     
...
       </participant>
    </group>
    <participant class="org.jpos.transaction.participant.SendResponse">        
    </participant>
</txnmgr>

  1. <CONTEXT_KEY_TO_SWITCH_ON> is the context key that contains the value based on which you want to select the destiny.
  2. <LOCAL_VALUE> is the value of that key that should make the transaction go to local
  3. <UAT_VALUE> is the value of that key that should make the transaction go to UAT.
  4. <DEFAULT_ENDPOINT_OR_ERROR_GROUP> is the endpoint (or an error group, if you want to handle it like that) where you want to go if none of the previous match. Like the default on a java switch statement.

The Switch transaction participant is documented in the jPOS Programmer's Guide section 9.8.1.

Basically, we are saying that if the key matches <LOCAL_VALUE> run group LOCAL, if it matches <UAT_VALUE> run group UAT, else run whatever group you define there. Participants in each group get executed right after the Switch participant, and before the next one.

Select endpoint based on a property of a context object.

The OP asked in a comment to be able to select the endpoint based on a field of the request. For this we need to use code, it can be in a scripted participant.

Best option would be to use GroovyParticipant since it enables to precompile the script, but since the OP is not using jPOS-EE, not clear if he doesn't want to, or just isn't but willing to do.

Using BSHGroupSelector.

The simplest option is to use BSHGroupSelector since we just need to modify the Switch participant for this xml:

  <participant class="org.jpos.transaction.participant.BSHGroupSelector">
    <select>
      import org.jpos.iso.*;
      ISOMsg m = context.get("REQUEST");
      String de3 = m.getString(3);
      result = (/*condition on DE3 for selecting UAT*/) ?  "UAT" : "LOCAL";
    </select>
  </participant>

result is the variable used by GroupSelector to determine the result of the select method, i.e., get the group to run.

Using JSParticipant

There is no way to write a GroupSelector with JSParticipant that I know of. However, we can use a JSParticipant to extract field 3 to a context key. We would need to add this participant, previous to the Switch participant:

<participant class="org.jpos.transaction.participant.JSParticipant"
  logger="Q2" realm="js" src='cfg/extract-de3.js' />
</participant>

Where cfg/extract-de3.js has the following content:

var K = Java.type("org.jpos.transaction.TransactionConstants");
var prepare = function(id, ctx) {
  //put de 3 in context under de3 key.  ctx.put("de3", 
  ctx.get("REQUEST").getString(3);
  return K.PREPARED;
}

The Switch participant definition would be as follows:

    <participant class="org.jpos.transaction.participant.Switch"
      logger="Q2" realm="Switch">
      <property name="txnname" value="de3"/> 
      <property name="<LOCAL_VALUE>" value="LOCAL"/>                
      <property name="<UAT_VALUE>" value="UAT"/>                    
      <property name="unknown" value="<DEFAULT_ENDPOINT_OR_ERROR_GROUP>"/>
    </participant>

答案2

得分: 0

你可以利用jPOS环境变量并添加enabled属性。

你可以拥有一对环境变量,即uat.enabledlocal.enabled,可以像这样配置:

<participant name="LOCAL" class="com.sanjok.qbean.RestParticipant" enabled="${local.enabled}"> 
    ...
    ...
</participant>
<participant name="UAT" class="com.sanjok.qbean.RestParticipant" enabled-"${uat.enabled}">  
   ...
   ...
</participant>
  

然后,你可以使用YAML配置或仅使用环境变量(LOCAL_ENABLEDUAT_ENABLED)。

这在jPOS程序员指南的3.3节中有文档记录。

英文:

You can take advantage of jPOS environment variables and add the enabled attribute.

You can have a couple of environment variables, i.e:uat.enabledand local.enabled that you can configure like this:

<participant name="LOCAL" class="com.sanjok.qbean.RestParticipant" enabled="${local.enabled}"> 
    ...
    ...
</participant>
<participant name="UAT" class="com.sanjok.qbean.RestParticipant" enabled-"${uat.enabled}">  
   ...
   ...
</participant>
  

The you can either use YAML configurations or just environment variables (LOCAL_ENABLED and UAT_ENABLED).

This is documented in jPOS Programmer's Guide section 3.3.

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  • 本文由 发表于 2023年4月17日 13:21:26
  • 转载请务必保留本文链接:https://go.coder-hub.com/76031925.html
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