There are two types of services that can be used with a database adapter: Publication Service Adapter Publication service extracts data from the changed rows of a database table and publishes them on appropriate subject names which are then subscribed by adapter subscriber process starter. Subscription Service Subscription service of a database adapter does opposite to a publication service. When running as a subscriber, database adapter listens on a subject, receives messages and updates the relevant tables in its associated database. In this tutorial, we will be covering publication service of database adapter.
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There are two types of services that can be used with a database adapter: Publication Service Adapter Publication service extracts data from the changed rows of a database table and publishes them on appropriate subject names which are then subscribed by adapter subscriber process starter. Subscription Service Subscription service of a database adapter does opposite to a publication service. When running as a subscriber, database adapter listens on a subject, receives messages and updates the relevant tables in its associated database.
In this tutorial, we will be covering publication service of database adapter. We will write a business process that will have Adapter Subscriber as start activity which will receive a message from the publication service of the specified adapter. We need to use Test Connection button on the bottom to ensure that connection is fine with database.
Using Test Connect button, test if your database connection is successful by giving database username and password. Creating Adapter Publication Service: Now we need to add a publication service in our adapter. Its created automatically. Now is the time to move forward for crating a process for our adapter service.
Step 3: Create Adapter Subscriber Process We create a process employeeSubscriber that will subscribe to the adapter we created in step 2. This process will have a Adapter Subscriber activity as its process starter. This process will write the information that it receives through adapter into a text file.
Process will look like below: In Adapter Subscriber Configuration tab, we choose our Adapter Service by using binocular. This will be the service for which this subscriber will be listening on a given subject. In this tutorial example, I have kept it to default without making any changes as shown below: Adapter Subscriber Output tab shows the output of the subscriber activity. In body of its output, it will have all the columns of our publisher table as shown below: We use confirm activity after Adapter Subscriber to confirm the receipt of message.
The Confirm activity confirms any confirmable messages received by the process instance. In configuration of confirm activity, we specify confirm event which is adapter subscriber in our case.
We have used a Write File activity which will write Employee Details to a text file. Now we are done with setting up all required bricks and blocks of our building and now is the time to test it.
So we need to use both Adapter Tester and Process Tester for testing our code. We can open Adapter Tester by going through Tools Menu in Tibco designer as shown below: After opening Adapter Tester, choose the adapter from the left side where all available adapter services are shown. Make sure that Working Directory points to the bin folder inside adapter installation path as shown below: Using Start Buton, start the adapter.
Once adapter is started, Start Button should change to Stop Button. Now our adapter is up and running. We need to start our process as well so that any messages received by Adapter go to its subscriber. Once we have our adapter as well as process ready in the tester, its time to play with our database table to fire the event.
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If this property is not specified, the default value of 2 is used. Possible values are: 0 - Log no debug information. Setting of this property overrides the Group Size setting in the Publication Service configuration. The default value is off.
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Request-Response Invocation Service Publication Service : An adapter publication service recognizes when business events happen in a vendor application, and asynchronously sends out the event data in realtime to interested systems in the TIBCO environment. For example, an adapter can publish an event each time a new customer account is added to an application. Other applications that receive the event can then update their records just as the original application did. When an application receives a request to create a customer record, the application notifies the adapter about the request and the adapter publishes the event. Reads data from the source table. Sends the data to the message bus. Subscription Service: An adapter subscription service asynchronously performs an action such as updating business objects or invoking native APIs on a vendor application.
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