Enterprise Integration Patterns in Cloud Platform Integration (EIPinCPI)

[bhalchandraswcg]

Hi SAP Community,

I want to contribute more to the SAP Community. Here's an idea: why not blog about 65 integration patterns explained in Enterprise Integration Patterns book by Gregor Hohpe and Bobby Woolf and their implementation in SAP Cloud Platform Integration.

So, my resolution for 2020 is to blog about Enterprise Integration Patterns in Cloud Platform Integration. I aim to post a blog about an integration pattern every Sunday. I will call this project EIPinCPI. You can easily follow blogs in this series by following the tag EIPinCPI. Maybe, not all of the patterns can be implemented in CPI, maybe some of them can only be implemented partially, I'll try my best to inform the same in my blogs.

Here's the table of integration patterns [1]. I'll link to individual blogs as I write them:

Message Construction	Message Routing	Message Transformation	Messaging Endpoints	Messaging Channels	System Management
Message	Pipes-and-Filters	Message Translator	Message Endpoint	Message Channel	Control Bus
Command Message	Message Router	Envelope Wrapper	Messaging Gateway	Point-to-Point Channel	Detour
Document Message	Content-based Router	Content Enricher	Messaging Mapper	Publish-Subscribe Channel	Wire Tap
Event Message	Message Filter	Content Filter	Transactional Client	Datatype Channel	Message History
Request-Reply	Dynamic Router	Claim Check	Polling Consumer	Invalid Message Channel	Message Store
Return Address	Recipient List	Normalizer	Event-driven Consumer	Dead Letter Channel	Smart Proxy
Correlation Identifier	Splitter	Canonical Data Model	Competing Consumers	Guaranteed Delivery	Test Message
Message Sequence	Aggregator		Message Dispatcher	Channel Adapter	Channel Purger
Message Expiration	Resequencer		Selective Consumer	Messaging Bridge
Format Indicator	Composed Message Processor		Durable Subscriber	Message Bus
	Scatter-Gather		Idempotent Receiver
	Routing Slip		Service Activator
	Process Manager
	Message Broker

Why Patterns?

Now that we have index out of the way, let us explore a little bit about reasons to use Enterprise Integration Patterns (This paragraph is based on "Why Enterprise Integration Patterns?" paragraph in the book Enterprise Integration Patterns by Gregor Hohpe and Bobby Woolf) [1]:

1. Patterns are accepted solutions to recurring problems, for example,
   
   
   
   • How can I add information from the third party before sending the message to a receiver system? The answer is simple - use the 'Content Enricher' pattern.
   
   
   • I need to send orders to two systems - A and B. However, system A only requires the order if the order costs over £500. How can I achieve this? The answer is simple - use the 'Message Router' pattern.
   
   
   
   


2. Patterns are abstract, i.e., you can apply patterns in SAP Cloud Platform Integration as well as SAP Process Integration and many other integration tools available in the market


3. Patterns provide a vocabulary to efficiently describe the solution like used above in point number 1.

I hope you are excited to know more about individual patterns and see how to implement them in CPI.

EIPinCPI Rating

EIPinCPI rating indicates how well a given pattern is supported in CPI (Credits: owen.pettiford3 and daniel.graversen). From the Selective Consumer pattern, EIPinCPI rating is added.

Hope this helps,
Bala

References/Further Readings

1. Messaging Patterns Overview: https://www.enterpriseintegrationpatterns.com/patterns/messaging/


2. SAP's Guidelines to Implement Specific Integration Patterns


3. Integration Flow Design Guidelines - Enterprise Integration Patterns on API Business Hub

P.S.: alexander.bundschuh started another blog series on Enterprise Integration Patterns and their implementation in CPI as well as Process Orchestration.

alexander.bundschuh's blog series:

• Scatter-Gather


• Composed Message Processor


• Aggregator


• Content-Based Router


• Recipient List


• Message Filter


• Content Filter


• Content Enricher