Execution model

The WebSphere Business Integration Message Broker execution model is the system used to execute message flows through a series of nodes.

When an execution group is initialized, the appropriate LILs are made available to the runtime. The Execution Group runtime process starts, and spawns a dedicated configuration thread. In the message flow execution environment, the message flow is thread-safe. You can concurrently run message flows on many threads, without having to consider serialization issues. Any user-defined nodes that you implement should not compromise this threading model. Note the following points:

If, for example, you are using a user-defined node to process messages, and you are also using a user-defined parser to parse the incoming messages, both the node and parser will contain implementation functions. The broker calls these implementation functions, or callbacks, when certain events occur.

When an input message is received into the broker at that input node, it is sent to the user-defined node.
Related concepts
Runtime environment
Brokers
Execution groups
Message flows overview
Logical message tree
Related tasks
Designing a message flow