Enterprise Service Bus (ESB)

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  • The infrastructure of a SOA landscape that enables the interoperability of services.
  • Its core task is to provide connectivity, data transformations, and (intelligent) routing so that systems can communicate via services.
  • ESB is just a piece of software, hardware is not part of ESB.

ESB Responsibilities

  • Providing connectivity
  • Data transformation
  • (Intelligent) routing
  • Dealing with security
  • Dealing with reliability
  • Service management
  • Monitoring and logging

Interoperability through transformation

  • May transfer any protocol to any protocol
  • May change the formats or mappings
  • May contain transformation logic
  • Should not contain business logic


  • There must be some way of sending a service call from a consumer to a provider, and then sending an answer back from the provider to the consumer
  • Depending on the technology used, and the level of intelligence provided, this task may be trivial, or may require very complicated processing



Protocol-Driven Versus API-Driven ESB

Soa-Protocol-Driven Versus API-Driven ESB1.png Soa-Protocol-Driven Versus API-Driven ESB2.png

Other Important Concepts

  • Point-to-Point Connections Versus Mediation
  • Data Mapping
  • Security
  • Reliability (message delivery and queueing)
  • Service Management (replaces UDDI)
  • Monitoring and Logging

Business Activity Monitoring (BAM)

  • Shows the state of your business on the fly
  • Analyses activity rather than data (compare data warehouse and data mining)