Composite levels Sensors In Oracle SOA

Composite sensors provide a method for implementing trackable fields on messages. Composite sensors enable you to perform the following tasks:

• Monitor incoming and outgoing messages.
• Specify composite sensor details in the search utility of the Instances page of a SOA composite application in Oracle Enterprise Manager Fusion Middleware Control. This action enables you to locate a particular instance.
• Publish JMS data computed from incoming and outgoing messages.
• Track composite instances initiated through business event subscriptions.

You define composite sensors on service and reference binding components or on service components that have business event subscriptions in Oracle JDeveloper. This functionality is similar to variable sensors in BPEL processes. During runtime, composite sensor data is persisted in the database.

Inside the BPEL process we only have receive activity.Our BPEL process will accept the fields defined in schema and and will generate response from WS as per business need, But there are some chances that there will some data failure so in this case composite level senser will be helpful so we can track what was the input and what was the output, As over the WS over period there are N number of execution and this will be very difficult to identify the route cause of the error from EM console of oracle until we did not know what was request data so we can apply search over same, In this case composite level sensor will help.

Step1: To create sensors ,Click the Composite Sensor icon above the SOA Composite Editor

Step2: Composite sensors window will pop up.Click on "+" icon to create composite sensor.

Step3: In the next window, give the name to sensor and define expression to assing value to this sensor, You will see the input payload only in our usecase as our BPEL process is one way only.Drill down to NumDoc and click OK, Now under sensor actions you will see two options Enterprise Manager and JMS Queue.

• Enterprise Manager

Select to make runtime sensor data searchable in the Instances tab of a SOA composite application in Oracle Enterprise Manager Fusion Middleware Control.

• JMS Queue

Select to store composite sensor data (XML payload) in a JMS queue. You must specify the JMS connection factory and queue name.In our case we will use Enterprise Manager

Step4:Our Composite sensor NumDoc is created .Click OK.

Step5: Compile and deploy your code to EM and test.

Step6: Go to your Composite in EM and go to Instances tab.Just next to Search,Reset Buttons you will see a new button :AddFields. Click on that and select NumDoc.New search field "NumDoc" will be added in the Search box along with all other existing search criterias.In this way you can search your instances by passing NumDoc field value.

Composite sensors are very important from support and operations point of view as we can set custom search fields using which we can search for our composite instances.