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⟩ Please explain what is BizTalk Pub-Sub architecture?

Fundamental to BizTalk is the Publish / Subscribe Architecture. This architecture basically comprises of 2 main components. First of all, a publisher, who would be responsible to publish the message in the message store. And secondly, a subscriber, who will subscribe to messages of a particular format so that he gets them whenever they are published.

Publishing refers to the process of inserting the messages in the message box database. Normally, a receive port, an orchestration or solicit send port would be involved in publishing any message to the message box. A receive port would receive the message from the pipeline and publish it to the message box for an orchestration or a send port to pick up.

An orchestration would publish the message usually while sending it using the send shape. A solicit response port would actually publish the message when it receives a response from the end system.

The subscribers would indicate the message they would like to receive by a set of criteria or filters.

Thereby, whenever a message is posted or published to the message box database, a subscriber will be able to get the message based on the filters or criteria mentioned while subscribing. The filters can be specified only on the promoted fields on the message.

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