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Optional Features In addition to the core ESB functionalities discussed in the last section, you ll commonly find a number of optional features in a particular implementation of the ESB patterns. These additional features, along with the core functionalities of an ESB, are called mediation patterns. Here are some of the optional features included in an ESB:
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Data enrichment This feature allows an ESB to augment the message payload from an external source so as to match the requirements of a service provider. External sources may include a database. This augmentation is shown schematically in Figure 8.9. A sample situation where such an augmentation is needed is an incoming service request that contains an address without a country name. However, the service provider needs the complete address, including the name of the country, for it to process or service the request. In such a case, an ESB can augment the incoming payload message with the name of the country, perhaps a default name, from a data source. It is interesting to note that, in principle, enrichment can occur in the service response as well. Distribution This ESB feature allows multiple consumer applications to subscribe to a particular type of message, and the ESB distributes the message to each of those applications. This is shown schematically in Figure 8.10. An example where this might be needed is the request for a stock quote.
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Deriving a complex event from multiple messages or from a stream of
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Correlation This feature provides a facility to derive a complex event from multiple messages or from a stream of events. This facility relies on the rules for pattern recognition and the rules for forming the complex output message. The correlation feature is shown schematically in Figure 8.11. Monitoring This feature provides the facility to observe messages as they pass through the mediation unchanged. It can be used to monitor service levels, to assist in problem determination or to meter usage for subsequent user billing, or to record business-level events (such as purchases above a certain dollar value). It can also be used to log messages for audit or for subsequent data mining. This monitoring facility is shown schematically in Figure 8.12.
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In addition to these optional services, an ESB usually provides technical services such as logging and exception handling. Logical Components In order to implement the core and optional functionalities described in the last two sections, a number of components are required in an ESB s construction. In this section, we provide a conceptual or logical view of some of these important components (see Figure 8.13).
Adapters
Adapters are probably the most important components of an ESB. These adapters exist at the peripheries of the ESB. All the requests coming in and going out use these adapters. Adapters allow the ESB to interact
Enterprise Service Bus
SOAP/ HTTP Task Dispatcher XML/ HTTP ROUTING ENGINE
SOAP/ HTTP
XML/ HTTP
DISPATCH
XML/ JMS Consumer SOAP/ JMS
DELEGATE
Transformer
XML/ JMS Provider SOAP/ JMS
Data Services
Data Store RMI/ IIOP RMI/ IIOP ESB
Some of the logical components of an ESB
with varied input and output mechanisms. Each adapter caters to the need of a specific service consumer or service provider. These service consumer specific and service provider specific adapters understand only certain combinations of communication protocol and message format. For example, you can have an input adapter that takes in all requests that come in as SOAP over HTTP. Similarly, you can have a separate adapter that takes in requests that come in as XML over HTTP. Some of the common combinations include SOAP/HTTP, XML/HTTP, RMI/IIOP, XML/JMS, and SOAP/JMS. Adapters provide a uniform view to ESB components by abstracting the specifics of entry and exit point mechanisms and protocols. This allows the ESB components to receive input from any protocol and send output to any protocol.
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Dispatcher
The dispatcher component works as the centralized entry point. Dispatcher is responsible for retrieving input from the adapters and passing it to a task for appropriate routing, transformation, and enrichment work. The dispatcher sends the request to a request handler and, along with the request handler, provides basic content-based routing capability to the ESB.
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