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Protocol mismatch problem in the absence of an ESB
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HTTPS Enterprise Service Bus (ESB)
Application 4
Application 5
Application 6
Figure 8.5 Using an ESB, applications with different transport protocols can communicate
using different protocols can interact with each other, as shown in Figure 8.5. Data/Message Transformation One more heterogeneity problem is not addressed by Figure 8.5 the problem of data/message format mismatch. This problem refers to the fact that sometimes the data format provided by the service consumer and the data format required by the service provider application do not quite match. This prevents applications from interacting with each other. The problem is depicted in Figure 8.6.
Application A
Data Format 1
Data Format 2
Application B
Data/message mismatch problem
Application 1
Application 2
Application 3
SOAP/ HTTPS Enterprise Service Bus (ESB )
Application 4
Application 5
Application 6
Using an ESB, applications can interact even when their data/message formats do not match.
Therefore, another core functionality that needs to be provided by an ESB is data or message transformation. When this functionality is combined with the other two ESB functionalities, the applications are easily able to connect and interact with each other, even when their interfaces and protocols do not match completely. This is shown in Figure 8.7. Core Functionalities To summarize, an ESB offers the following key functionalities:
Content- and context-based routing Protocol transformation or switch Data or message transformation
These three basic functionalities of an ESB are depicted schematically in Figure 8.8. With these three functionalities incorporated into an ESB s core, the ESB can offer a number of virtualizations. The three main categories of virtualizations are as follows:
Location and identity virtualization The service consumer application does not need to know the address or location of the service provider application, and the service provider does not need to know the identity of the service consumer application. The service request can be lled by any one of a number of service providers. This allows the service provider to be added or removed from the integrated structure without bringing down the system, thus providing for uninterrupted service to the service consumer.
Enterprise Service Bus
Protocol Switch
Data Transform
The core functions supported by an ESB
Interaction protocol The service consumer and service provider need not share the same communication protocol or interaction style. For example, a service request coming in as SOAP over HTTP can be serviced by a provider that understands only Java RMI over IIOP. Interface The service consumer need not agree on an exact match with the interface offered by the service provider. The ESB reconciles the difference by transforming the request message into the form expected by the service provider.
The virtualization of these aspects allows an ESB to provide a transparent service provider implementation to the service consumer, both at development time and at deployment time. The ESB takes responsibility to deliver a service request to the appropriate service provider, and the service provider responds to the service request without knowing where the service request is coming from. Additionally, the ESB itself is transparent to both the consumer and the provider of a service. Application logic can consume or provide a service without ever knowing whether the connection is direct or an ESB has been employed. Therefore, whether or not to employ an ESB
is a deployment-time decision because no change to the application code is necessary or required. An ESB supports a number of different types of interactions between the service consumer application and the service provider application. These interaction types include synchronous request-and-response operation, asynchronous interaction, and publish-and-subscribe. Note that an ESB can convert between these types of interactions. For example, a service request coming as a synchronous (request and response) operation can be serviced by an asynchronous service provider. Recall from 6 that a correlation ID can be used for servicing a synchronous call using an asynchronous provider. So far we have discussed only the functional requirements that are met by the core functionalities offered by an ESB. However, equally important are the nonfunctional requirements by the applications being integrated. These nonfunctional requirements are generally known as the Quality of (Interaction) Service (QoS) requirements. These QoS requirements are specified by the service participants, and an ESB provides services to implement these requirements for the service participants. Here are some of QoS requirements commonly supported by an ESB:
Performance and reliability Performance requirements may include that the response time of a service not exceed a certain xed amount of time, such as 50 milliseconds. An example of a reliability (or availability) requirement might be that the service provider is up 99.999% of the time. Security services Security is an important issue in general for distributed computing, but it is especially important when external third-party services are consumed by your system or when your system provides services to the external third parties. The ESBs that offer security services do not directly provide security themselves. They simply provide a framework for security software to plug into as well as capabilities to help the ESB navigate through the network without getting blocked by rewalls or any other kind of security arrangement. An example of security software that can work with an ESB is Tivoli Suites from IBM. Some security services provided by an ESB include the following:
Data encryption to ensure the privacy of the data. Authorization of service requests. Is the user of a service who they say they are Data integrity. Is the data genuine Auditing service. Automatic auditing of service interactions for contractual/legal reasons or for billing purposes.
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