The document discusses Mule Flow architecture and message processing. It describes how composite source scopes can embed multiple connectors to trigger flows. Message processors like filters and transformers can be combined using scopes to implement parallel processing and reusable sequences. Exception strategies determine how Mule responds to errors during message processing, and pre-packaged strategies handle exceptions at different points. Flows typically use an inbound endpoint as a message source, may include a filter and transformer, and allow sending messages to queues and calling other flows throughout.

1. Mule Flow
Architecture Part 2

2. Message Processing Blocks
• Composite source scope allows you to embed
into a single message source two or more
Anypoint Connectors
• Whenever one of these listeners receives an
incoming message, it triggers a flow instance
and starts the message through the message
processing sequence

3. Message Processing Blocks
• Building blocks known as scopes provide
multiple ways to combine message
processors:
– Make your XML code much easier to read
– Implement parallel processing
– Create reusable sequences of building blocks

4. Exchange Patterns

5. Processing Strategies

6. Exception Strategies
• Determines how Mule responds if and when an error occurs
during the course of message processing
• Configure a custom exception strategy to respond in a variety of ways to a
variety of conditions
• Studio provides four pre-packaged error handling strategies to handle
exceptions thrown at various points during the message processing
sequence

7. Flow Architecture

8. Flow Architecture
• You could embed the filter and the
transformers inside the inbound endpoint:

9. Flow Architecture
• You could embed the filter and the
transformers inside the inbound endpoint:

10. Flow Configuration
• A typical flow might utilize the following
sequence:
– A message source consisting of one or more
inbound endpoints or other streaming connectors
triggers the flow each time it receives a message
– A filter may identify invalid messages and decline
to pass them to the rest of the flow for processing
– A transformer can convert the incoming message
into a data format consumable by the other
message processors in the flow

11. Flow Configuration
• Throughout the flow, you can do the
following:
– Send messages to queues
– Specify threading models
– Call various other flows

12. Question and answer