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Periodic Execution of Integration Process¶

What you'll build¶

The sections below demonstrate an example of scheduling a task (using the default implementation) to inject an XML message and to print it in the logs of the server.

Let's get started!¶

Step 1: Set up the workspace¶

Download the relevant ESB Integration Studio based on your operating system.

Step 2: Develop the integration artifacts¶

Follow the instructions given in this section to create and configure the required artifacts.

Create an Integration Project¶

An Integration project is a maven multi module project, which will contain all the required modules for the integration solution.

Open ESB Integration Studio.
Click New Integration Project in the Getting Started tab as shown below.

This will open the New Integration Project dialog box.
Enter SampleServices as the project name and select the following check boxes to create the required modules.
- Create ESB Configs
- Create Composite Exporter
Click Finish.

You will now see the projects listed in the Project Explorer.

Creating the Sequence¶

In the Project Explorer, right click ScheduleDefaultTaskConfigs project, and click New → Sequence.
Click Create New Sequence and click Next.
Enter InjectXMLSequence as the sequence name and click Finish.
Drag and drop a Log mediator and a Drop mediator from the Mediators Palette.

Click the Log mediator and enter the following details in the Properties section.

Log Category: INFO
Log Level: CUSTOM

Add a new property with the following details:

Property	Description
Property Name	City
Value Type	EXPRESSION
Expression	//city

Shown below is the complete source configuration of the Sequence (i.e., the InjectXMLSequence.xml file).

<?xml version="1.0" encoding="UTF-8"?>
<sequence name="InjectXMLSequence" trace="disable" xmlns="http://ws.apache.org/ns/synapse">
   <log level="custom">
       <property expression="//city" name="City"/>
   </log>
   <drop/>
</sequence>

Creating the Scheduled Task¶

In the Project Explorer, right click ScheduleDefaultTask, and click New → Scheduled Task.
Select Create a New Scheduled Task Artifact and click Next.
Enter the following details and click Next:
- Task Name: InjectXMLTask
- Count: -1
- Interval (in seconds): 5
In the Form View of the InjectXMLTask task, click Task Implementation Properties.
1. Enter the following parameters:
  - injectTo: sequence
  - sequenceName: InjectXMLSequence
2. Select XML as the Parameter Type of the message parameter, and enter the following as the XML message in the Value/Expression field and click OK.
```
<request xmlns="">   <location>   <city>London</city>    <country>UK</country>   </location>    </request>
```

Shown below is the complete source configuration of the scheduled task.

<?xml version="1.0" encoding="UTF-8"?>
<task class="org.apache.synapse.startup.tasks.MessageInjector" group="synapse.simple.quartz" name="InjectXMLTask" xmlns="http://ws.apache.org/ns/synapse">
   <trigger interval="5"/>
   <property name="injectTo" value="sequence" xmlns:task="http://www.wso2.org/products/wso2commons/tasks"/>
   <property name="sequenceName" value="InjectXMLSequence" xmlns:task="http://www.wso2.org/products/wso2commons/tasks"/>
   <property name="message" xmlns:task="http://www.wso2.org/products/wso2commons/tasks">
       <request xmlns="">
           <location>
               <city>London</city>
               <country>UK</country>
           </location>
       </request>
   </property>
</task>

Step 3: Package the artifacts¶

Package the artifacts in your composite application module to be able to deploy the artifacts in the server.

Open the pom.xml file in the composite exporter module.
Ensure that the relevant artifacts are selected in the POM file.
Save the changes.

Step 4: Build and run the artifacts¶

To test the artifacts, deploy the packaged artifacts in the embedded Micro Integrator:

Right-click the composite exporter module and click Export Project Artifacts and Run.
In the dialog box that opens, confirm that the required artifacts from the composite exporter module are selected.
Click Finish.

The artifacts will be deployed in the embedded Micro Integrator and the server will start.

See the startup log in the Console tab.
See the URLs of the deployed services and APIs in the Runtime Services tab.

Step 5: Test the use case¶

You will view the XML message you injected getting printed in the logs of the Micro Integrator every 5 seconds.

[2019-10-10 19:33:00,602]  INFO {org.wso2.micro.integrator.ntask.core.impl.AbstractQuartzTaskManager} - Task scheduled: [-1234][ESB_TASK][InjectXMLTask]
[2019-10-10 19:33:00,671]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:05,602]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:10,603]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:15,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:20,600]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:25,600]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:30,601]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:35,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:40,603]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:45,600]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:50,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:33:55,603]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:00,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:05,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:10,599]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:15,607]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:20,605]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London
[2019-10-10 19:34:25,603]  INFO {org.apache.synapse.mediators.builtin.LogMediator} - City = London

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