EIPinCPI - Normalizer

[bhalchandraswcg]

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This week, we'll study a Message Transformation pattern known as Normalizer.

When do I use this pattern?

Normalizer pattern is used to translate/map objects in different format into a common format. Here, the different objects represent a single entity. For example, an order coming from Business Partner A can have a different format to an order sent by Business Partner B. In this case, the message from both business partners represents an order. So both these orders can be translated/mapped to a common format of order for processing in the middleware.

Normalizer in CPI

In CPI, we can use the Message Translator pattern to achieve a single transformation from a given format to target format. If we have Message Translators for each format, then we will be able to "normalize" the format. We also need a Message Router to route the incoming message to correct Message Translator.

Integration Flow

Place an Order

The integration flow exposes the Normalizer as HTTPS service using HTTPS Sender Adapter. The Normalizer consists of a Router and two Message Mappings.

Here's the configuration of the Router:

Order	Route Name	Condition Expression	Default Route
1	Format A	boolean(/Order/Id)	Unchecked
2	Format B	boolean(/Order/OrderID)	Unchecked
3	Unknown Format		Checked

In the Router, we are determining the data format based on the existence of /Order/Id node or the existence of /Order/OrderID node. Based on the identified format, appropriate message mapping is executed.

Conclusion

The Normalizer pattern refers to translating an entity from multiple formats into a common format. In CPI, a combination of Message Router and Message Translators can be used to implement a Normalizer.

References/Further Readings

• Normalizer Pattern in Enterprise Integration Patterns


• EIPinCPI
  
  
  
  • Message Translator
  
  
  • Message Router
  
  
  
  


• CPI Components
  
  
  
  • HTTPS Sender Adapter
  
  
  • Router
  
  
  • Message Mapping
  
  
  
  

Hope this helps,
Bala

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