Anti-Corruption Layer

Implement a Façade or Adapter layer between different subsystems that don’t share the same semantics (either permanently or temporarily) 

When to use this pattern?  

• Multi stage system migration  

• Multiple subsystems with different technologies semantics, still need to communicate  

  • Asynchronous message processing systems like JMS, AMQP, STOMP 

When NOT to use this pattern? 

• No Significant semantic differences between legacy and new systems. 

Design Decision:

1. Choose a standalone ACL layer when

   1. Multi-stage system migration  

   2. Permanent ACL  

   3. Scalability  

   4. Extra Cost 

2. Choose ACL in the new environment when

   1. Permeant communication with another legacy system.  

   2. No standalone extra fees.  

   3. No control to change the legacy system

3. Choose ACL in the legacy environment when

   1. Permeant communication with a new system.  

   2. No standalone extra fees  

   3. No control over new system