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Request Handler
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Each service has specific request handlers. The routing engine receives service-specific parameters from the request handlers and then the request handlers hand over the request to the routing engine for appropriate task execution.
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Routing and Rules Engine
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The rules engine and routing task are responsible for executing the transformation and enrichment tasks and routing them to the appropriate service delegates. Service delegate components are described next.
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Service Delegates
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Delegates are provider end point specific components. They communicate with the service provider using adapters. Delegates are specific to the provider-specific end point because they provide more coarse-grained abstraction about the semantics of communication with the provider end point. Adapters, on the other hand, abstract a more fine-grained protocol mechanism to connect to the end point. Thus, to provide logical operation delegates, use the appropriate adapters for executing the service interface.
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Transformation Engine
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The transformation engine component transforms the incoming (or source) data/message into a format that s compatible with the format required by the service provider. This is one of the core elements of ESB that facilitates integration between disparate service interfaces.
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Enrichment Component
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This component allows an ESB to augment the message payload from an external source so as to match the requirements of a service provider. The external source may be a database. A sample situation where such
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Enterprise Service Bus
an augmentation is needed is an incoming service request containing an address without containing 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. Sometimes the functionalities offered by the transformation engine component and enrichment component can be combined in a single component.
Logging Component
This component provides the necessary logging support for the ESB components.
Exception-Handling Component
This component handles all the exceptions generated by the various components of an ESB. Deployment Con gurations Deployment patterns of Enterprise Service Bus depend on many factors. The main factor determining how ESBs are deployed is the size of the enterprise. For a small enterprise, a single ESB with a single registry attached to it might suffice. However, for larger enterprises, more complex deployment patterns involving several ESBs with a number of registries might be needed. The type of ESBs needed in each of these patterns is determined by the specific connectivity requirements of each of these enterprises. For example, an enterprise needing to connect to third-party partners and vendors may need an ESB specially designed to handle the security situations for connecting to the third parties. Such ESBs are known as gateways. Later in the chapter, we discuss some specific usage scenarios and how to design different connectivity solutions for such scenarios. Note that there are basically four known configurations for deploying ESBs. The patterns and conditions under which each of these configurations should be employed are discussed next.
Global ESB
In this pattern of deployment, there is a single ESB for the entire enterprise. The ESB employs a single registry. This configuration is suitable for a small enterprise or a single line of business. In this case, all the services are available to all the participants. There is no requirement
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Global ESB
to connect to third-party external vendors or partners; therefore, the requirements for security are minimal. This pattern of interaction between participants is shown schematically in Figure 8.14.
Directly Connected ESBs
The second method employs directly connected ESBs. This involves more than one directly connected ESB, as shown in Figure 8.15. This pattern employs a common registry so that the services are visible throughout the enterprise. For example, this pattern can be employed to connect a set of packaged applications (such as SAP applications) to the rest of the enterprise. Such packaged applications usually have
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