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Secure and Reliable Connectivity to Third-Party Providers
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PremierBank has a requirement to use third-party services such as credit and address verification for opening new accounts and processing loan applications. However, the connection to the third-party service provider must be secure because of the confidentiality requirement for credit data. In addition, connectivity should not expose the PremierBank IT system to the external system. Controllable/managed connectivity is required to the third-party system. To meet these requirements concerning connectivity to the thirdparty vendors/partners, the solution is a gateway pattern, as shown in Figure 8.20.
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This solution is based on an integration device from IBM called WebSphere DataPower Integration Appliance X150, which provides the required functions related to the security and control of the communication between the PremierBank IT environment and the third-party credit-verification service. Appliance X150 has a service proxy built in. The service proxy performs the following two functions:
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It uses a service registry and repository to ensure that only the services sanctioned by the PremierBank architecture team are accessible from the PremierBank IT system. IBM WebSphere Service Registry and Repository (WSRR) is employed. It mediates the service request, so that the service that is actually invoked may be different from the service provider request by the user.
In addition to the proxy services, Appliance X150 also provides a full range of security (for example, data encryption and authentication) as required for secure communication with vendors such as the creditverification service.
Connectivity Between Domains (Federation)
To demonstrate the use of the ESB deployment patterns discussed earlier, we will consider a situation that requires the use of a federation pattern. PremierBank, after implementing the aforementioned changes, has a distributed architecture. It consists of various remote branch offices, which work somewhat autonomously and have their own ESBs.
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These branch offices want to have the freedom to choose their own implementation of ESBs. In addition, a requirement for future expansion of the PremierBank enterprise through acquisitions and mergers is that these new additions bring in their own implementations of ESBs. Therefore, there is need to join heterogeneous implementations of ESBs used in different domains. The management of PremierBank wants to impose some standards for service interactions but also wants to allow the domains to make changes to the providers and interfaces without impacting the bank customers. The current situation at PremierBank is depicted schematically in Figure 8.21. Each PremierBank branch office (BO) makes direct, point-to-point connections with the services running in the headquarters (HQ) domain. For an application running in the remote office to communicate with a service running at HQ, the following interactions take place:
The remote of ce application interacts with the ESB in the remote of ce. The remote ESB looks up the service provider in the registry/repository in the HQ of ce. The remote ESB makes a direct connection to the application in the HQ of ce offering the service.
The solution works fairly well but is somewhat rigid in that it does not allow changes in the HQ applications easily. In particular, if the HQ
Headquarters Remote Branch Office
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solutions
Current situation at PremierBank after implementing the previous three
Enterprise Service Bus
Headquarters Remote Branch Office
ESB Consumer
SOAP/ HTTP
Provider
Registry/ Repository
Connectivity between domains (federation)
service changes its interface, every remote office ESB would need to be updated to take this change into account. The solution is to introduce a powerful, central ESB at the HQ domain that can support dynamic, loosely coupled routing in all domains. The solution is shown in Figure 8.22. An ESB, employing IBM WebSphere Message Broker (WMB), is installed at HQ. The ESBs at the remote branch offices connect through the ESB at HQ instead of directly connecting to applications at HQ. WMB is selected as the ESB at HQ because it maximizes the interfaces and bindings it can work with. Furthermore, WMB is capable of handling the expected large volume of transactions. The following are the two main advantages of this new federated architecture:
The HQ can make changes to the services it offers without impacting the branch of ces. New and multiple service provider applications can be added, new interfaces or bindings can be de ned, and services can be versioned. The ESB in the HQ domain keeps track of all the changes. Therefore, changes in the implementation are not exposed to the branch of ces. In the previous architecture, if the ESB at the remote of ce did not support the binding or interface at the HQ service, it could not connect to the service. In this new proposed solution, the HQ ESB acts as an adapter, transforming service bindings and protocols, thus allowing remote of ce ESBs to connect to the previously inaccessible services.
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