Using ForEach BPEL

Something very used in programming languages is without doubt a FOR to iterate through a list of elements any, in this Post I intend to help you use the For Each component of the BPEL performing a simple loop, iterating and concatenating names that put as a parameter to our Loop .

For our tests, we will create a project called ForEachBpel

Click File >> New

Will open a screen like below:

Then select Generic Project

Project Name ForEachBpel place and select the SOA Technologies Project name and click the small arrow> to the name go right and be as below:

Note: See the Directory that it will automatically fill in the name will be created where the project name you entered in the Project Name

In my case: /home/uans/jdeveloper/mywork/UansBlogApplication/ForEachBpel

Click Next and then Finish, leaving the Composite Template in Empty Composite

Now we create an empty project will create a BPEL

Now right click Componets > Insert > BPEL Process

Click BPEL 2.0 Specification

In place name ForEachBpel

In Template select Synchronous BPEL Process and click OK

Let selected option Expose as a service SOAP, as this will be responsible for creating a WSDL and XSD default which will change for our tests.

Ready, it should look like this:

Now open the ForEachBPELProcess.xsd file that was created automatically.

In complexType element name=”process” will be as follows:

<element name=”process”>
       <complexType>
             <sequence>
               <element name=”input” type=”string”/>
           </sequence>
       </complexType>
</element>

Then change to: (only the highlighted in red)

So should look like this:

Let us understand what has changed:

In element name = “nome” changed our input variable to nome
In maxOccurs = “unbounded” I am saying that we have mentioned many times the parameter name
In minOccurs = “1” I am saying that this parameter is required

Now open your BPEL composite and within ForEachBPELProcess.bpel drag and drop the For Each component as follows:

Double-click on your ForEach1 and on the General tab set as follows:

Name: ForEachNome
Counter Name: ForEachContador

Now in Counter Values tab, Start Value place 1 in the Expression field and Final Value click on the icon that looks like a small calculator as follows:

In the box that opens in Advanced Functions select the BPEL XPath Extension Functions option

Double-click on it ora:countNodes()

Inside the parenthesis: ora:countNodes() put two single quotes and within single quotes press Control key on your keyboard while the space bar, see the options that appear below:

inputVariable
outputVariable
ForEachCont…

Select the inputVariable option, place a comma after the name, and place again two single quotes and inside the quotation marks select the payload option that will appear again put a comma and add two more single quotes within quotes and select the option: client:name that will appear, then you’ll be as follows:

ora:countNodes(‘inputVariable’,’payload’,’client:nome’)

Click OK, and looks like this:

Click OK again and drag a component Assign up our ForEach and rename the Assign1 name by double-clicking on the name and place the word Olá pressing Enter then, as follows:

Within our Olá it is our variable box, expand the option outputVariable >> payload >> client:processResponse >> client:result and into her drag the icon above that looks like a small calculator

Inside the box that opens add the name Olá: followed by a space in single quotes as shown below and click OK

Now into our ForEachNome drag another Assign and rename it to the name Concatenates

Open our Concatenates box again drag the icon that looks like a small calculator or simply click the right button on the name client:result (outputVariable >> payload >> client:processResponse >> client:result) e clique em Expression

Advanced Functions String Functions select the option

Double-click on the name concat and within the parentheses of concat() a double click client:result his outputVariable (outputVariable >> payload >> client:processResponse >> client:result)

Add a comma after the result and a single quote, a space and add again another single quotes followed by a comma and now double-click client:nome now your inputVariable (inputVariable >> payload >> client:process >> client:nome)

The name aside add [] and inside the brackets add the name of our For Each ($ ForEachContador, pay attention here which was added the dollar sign ($) identifying which is a variable), double-clicking on it and next to the brackets which was closed add a comma, a single quotation marks, again a comma and again a single quotation marks as follows: