Message contracts

Chapter 12 DBMS-Specific Features

Message contracts

Message contracts are intermediary objects that are used to include a single message in multiple contracts. Message contracts are modeled as extended objects with a stereotype of <<MessageContract>>.

Creating a message contract

You can create a message contract in any of the following ways:

Use the tools on the MessageTypes tab of a contract property sheet (see Contracts).
Select Model→Message Contracts to access the List of Message Contracts, and click the Add a Row tool.
Right-click the model or package in the Browser, and select New→Message Contract.

Message contract properties

You can modify an object's properties from its property sheet. To open a message contract property sheet, double-click its Browser entry.

The following extended attributes are available on the Microsoft tab:

Name	Description
Sent by	Specifies which endpoint can send a message of the indicated message type. Contracts document the messages that services can use to have specific conversations. Each conversation has two endpoints: the initiator endpoint, the service that started the conversation, and the target endpoint, the service that the initiator is contacting. Scripting name: Sender
Message type	Specifies the message type of the contract. Scripting name: MessageType