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At line 1 changed 1 line.
E4X's native XML Scripting makes Javascript very attractive for working on xml documents. It is motivation for integrating Javascript engine with BPEL-SE.
E4X's native XML Scripting makes Javascript very attractive for working on xml documents. It is motivation for us to integrate Javascript engine with BPEL-SE.
At line 3 changed 1 line.
Please refer to attached business process, this business process filters expensive items in a purchase order. It has two implementations. First one in IF block (activity name "if1" ) uses XPath and predicate. Second one is in else block uses Javascript.
Its value addition is demonstrated using following example. Let us write a business process to filter expensive items from a purchase order and do it using XPath 1.0 constructs and Javascript (E4X).
At line 5 changed 1 line.
This example should help in understand the value of Javascript integration.
Filtering expensive items using XPath 1.0
{{{
<assign name="Assign1">
<copy ignoreMissingFromData="yes">
<from>0</from>
<to variable="expItemCount"/>
</copy>
</assign>
<forEach name="ForEach1" parallel="no" counterName="ForEach1Counter">
<startCounterValue>1</startCounterValue>
<finalCounterValue>count($inputVar.po/ns2:item)</finalCounterValue>
<scope name="Scope1">
<if name="If2">
<condition>$inputVar.po/ns2:item[$ForEach1Counter]/ns2:qty &gt; 5 and $inputVar.po/ns2:item[$ForEach1Counter]/ns2:price &gt; 99
</condition>
<sequence>
<assign name="Assign2">
<copy>
<from>$expItemCount + 1</from>
<to variable="expItemCount"/>
</copy>
</assign>
<assign name="Assign3">
<copy>
<from>$inputVar.po/ns2:item[$ForEach1Counter]
<sxed:editor>
<sxed:predicate path="$inputVar.po/ns2:item[$ForEach1Counter]" source="from"/>
</sxed:editor>
</from>
<to>$outputVar.expensiveItems/ns2:item[$expItemCount]
<sxed:editor>
<sxed:predicate path="$outputVar.expensiveItems/ns2:item[$expItemCount]" source="to"/>
</sxed:editor>
</to>
</copy>
</assign>
</sequence>
</if>
</scope>
</forEach>
}}}
At line 7 removed 1 line.
Please let me know if it is not clear. If you like to see the working version, please drop-in.
At line 49 added 28 lines.
Same using Javascript
{{{
<assign name="Assign4">
<extensionAssignOperation><sunxd:Expression xmlns:sunxd="http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/DataHandling"
expressionLanguage="urn:sun:bpel:JavaScript"
inputVars="order=inputVar.po"
outputVars="outputVar.expensiveItems=expensiveItems">
<![CDATA[
var order1 = new XML(order);
default xml namespace = "http://xml.netbeans.org/schema/Synchronous";
var expensiveItems = <items/>;
expensiveItems.item = 0;
var rIndex=0;
for each (item in order1.item) {
if ((item.qty > 5) & (item.price > 99)) {
expensiveItems.item[rIndex++] = item;
}
}
]]>
</sunxd:Expression></extensionAssignOperation>
</assign>
}}}
[Design time|http://wiki.open-esb.java.net/Wiki.jsp?page=Embedded_JavaScript_UI] in Netbeans
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This page (revision-5) was last changed on 18-May-09 21:28 PM, -0700 by Murali