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External activation means that an external program maybe a. NET application gets started as soon as a new message arrives on a queue.
By now you have a basic understanding about the various objects that are involved in a basic Service Broker application. The following figure shows these objects and how they relate to each other.
After laying out the foundation of Service Broker, you will be now ready to implement your first Service Broker application. Your first Service Broker application is the famous Hello World application.
The application will simply send a request message that contains your name in the message body from the initiator service to the target service.
As discussed, almost everything in Service Broker is scoped to a database. Therefore you need to create a new database, as in Listing 1, which will host all the Service Broker objects you will be creating in the subsequent steps.
Listing 1: Creating a new database for the first Service Broker application. After creating your database for Service Broker, the next step is to define the necessary message types and the contract on which your Service Broker application is based.
As I have said earlier, your first Service Broker application will consist of a request message and a response message.
The direction of those two messages will be defined through one contract that your Service Broker application uses. Service Broker offers you the CREATE MESSAGE TYPE and the CREATE CONTRACT T-SQL statement for creating message types and contracts.
Listing 2 shows the creation of these Message Type and Contract objects. As you can see in Listing 2, each message type and each contract is given a unique name by adding a unique string to them.
As a best practice you can use the URL of your website or company to make it. However, you can use any valid SQL Server object name to name your message types and contracts.
After creating your message types and contracts, the final step is to create your queues and your actual Service Broker services that are interacting with each other, as shown in Listing 3.
For these tasks Service Broker offers you the CREATE QUEUE and the CREATE SERVICE T-SQL statements. As you can see, when creating a service, you have to reference previously created queue and contracts, that that Service Broker service implements.
After creating all of the necessary Service Broker objects you are finally able to start a conversation between both services and exchange messages.
The following listing shows the necessary steps to open a conversation and send a message through it. Listing 4: Opening a new Service Broker conversation and sending a message.
As you can see in Listing 4, you need to specify the initiator service, the target service, and also the contract when you are establishing a new conversation between two Service Broker services.
Optionally you can also define if encryption should be used or not. For simplification we are currently not encrypting anything, because we are just sending messages within a database.
The most important concept to understand here is the fact that the TO SERVICE is specified as a string literal. In our simple Service Broker application this seems a little bit confusing, but just think a second and assume that the target service is deployed somewhere on a different physical SQL Server instance.
In that case you might not be able to reference this remote deployed Service Broker service. Therefore you have to specify it here as a string literal.
Maybe you are wondering now how Service Broker can know where the actual target service is physically deployed? These commands do useful things such as:.
This model provides significant benefits for both development and operations teams:. Service brokers compliant with the Open Service Broker API specification allow platforms to provision a new instance of a service.
And the service broker provides all the information that your application or container needs to connect to the service instance. Then, you simply connect to the service instance, regardless of how or where the service is running.
For example, provisioning could also mean reserving some space in database which has previously been created. The specification purposefully provides a high-level abstraction, and is not opinionated on what should happen behind the API.
Getting started guide. Video: What is the Open Service Broker API? Video: Building services for Cloud Foundry and Kubernetes using the Open Service Broker API.
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