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Mohab El-Hilaly works as a Staff Software Engineer at IBM Cairo Technology Development Center, Egypt, where he develops and designs custom solutions using Websphere Enterprise Service Bus technology for various customers. In simple terms, a RESTful service should be accessible as a network-addressable resource that accepts a set of verbs defined by the implementer of that service.
Back to topThe role of the Enterprise Service BusAn Enterprise Service Bus provide mediation capabilities to give more options both for service providers and consumers. The rest of this section takes you through the steps to implement the mediation for these two services to realize the two scenarios.
The following illustration shows that the HTTP export is connected to a mediation flow that performs required transformation of the payload (the body of the HTTP request) sent from the REST client. Dependencies" from the context menuUnder Predefined Resources, select Schema for predefined HTTP bytes data binding. RETURN TRUE;After completing the steps above, you have a RESTful mediation with the same behavior of the RESTful mediation you have created while implementing scenario #1 on WebSphere Enterprise Service Bus. WebSphere Transformation Extender map to transform that binary payload to SOAP that can be accepted by web services.
IP address and port.A Binary Transformation action, which calls one of the WTX maps that was created in an earlier step, it converts the the binary input to a SOAP Request, as shown below.
Create the new XML Firewall with a static back end (instead of the loopback you used for scenario #1).
Back to topRESTClientRESTClient is another third-party open-source Java application that can be used to test RESTful applications. For such an adaptation, the Enterprise Service Bus can provide required mediation to expose non-RESTful services to be invoked RESTfully without the need to make changes to those services.
Through his involvement in lab services, Ahmed has been interested in bridging the gap between the theories behind technology and the practicality of implementations in order to serve customer business needs. Prior to that he developed custom solutions using various Microsoft Technologies, mainly C#.
Those options allow for the reuse of existing logic as services while serving a new class of consumers. Since the example described in this article shows the exchange of raw data, exchanging data of JSON format and invoking the service from an AJAX client would make a special case of the example provided. One of the key capabilities is to change the way a service is invoked without having to make changes to the service itself. In order to allow the Mediation module to be able to treat the HTTP request and response as binary data, a few steps have to be done before implementation. Wiring the mediation flow to the importDouble-click your mediation flow to map the operation you are providing for the REST consumers to the operation provided by the back end web service.Figure 14. In order to verify creation double click on the sub-flow the invocation primitives should be available.


Drag-and-drop the WSDL onto the canvas to start using it for the following steps.Figure 31. Adding a compute node to transform from SOAP to BLOBPlace a HTTPRequest node that will invoke the sample backend RESTful service. Adding an HTTPRequest nodeFor the HTTPRequest node, enter the URL address of the RESTful service.
Another transformation is also done the opposite way by transforming the SOAP reply from the web service to binary that can be sent to the requesting REST client. Importing the WSDL of the back end serviceAccept default values, till you press Finish button. Creating a Front Side HandlerBefore you click Next, set the IP, port and Remote URI for the back end sample web service.The Web Service Proxy is now configured and is ready to invoke the sample back end service. Configuring the Transform Binary actionA Transformation action that uses a simple XSLT to call the sample back end service via the Web Service Proxy, and creates the response message to be sent back to the requesting client.
Enter the Server Address and Port of the server that hosts the sample back end RESTful service.Figure 56. Selecting the endpoint and passing the parameterYou should see the result returned from the Web service provider.Figure 72. Representational state transfer “REST” utilizes the interaction capabilities classically offered by HTTP protocol. For example, using one of IBM Enterprise Service Bus products you can make existing SOAP-based web services accessible for REST clients (the article refers to this scenario as scenario #1).
Accordingly, the mediation flow transforms the content of the binary payload to string format to be part of the XML making the SOAP request that is passed to the back end service. Mapping operations between the export and the import interfacesCreate a new Business Object Mapper primitive to the canvas , the intention of this mapper is to convert the binary input to a string and manipulate it. Importing the WSDL file of the sample servicePlace a Compute node to convert the incoming message data from SOAP to BLOB (binary) so that it could be sent to the RESTful back end service.Listing 7.
For our example, we used the simple servlet of which the doPost() method is provided earlier in the article.Figure 34. In addition to those transformations, the XML Firewall uses XSLT function to invoke the back end web service via a Web Service Proxy. Then you configure the Web Service Proxy to handle the communication with the back end web service.
You can create this Type Tree by importing the WSDL file of the sample back end web service. The following steps shows you how to configure a loop back XML Firewall that should feed in the incoming requests to the Web Service Proxy you have just created.From the DataPower Control Panel choose XML Firewall. Although, it is not a comprehensive list of tools, you may find them useful to test both: the mediations you have created and the back end services, as well.


Step (4) prepares the request to be sent over the stream by converting the string into an array of bytes, i.e. Finally, you have enjoyed the inherent interoperability from interacting RESTfully by implementing consumers in different programming languages that consume the same RESTful service. The following sequence diagram shows a typical RESTful interaction where a client invokes a RESTful service passing a verb and some content (like parameters) to be processed by that service.Figure 1.
You may also utilize the Enterprise Service Bus capabilities to expose RESTful services as SOAP-based for web service clients (the article refers to this scenario as scenario #2). The following illustration shows a summary of the tools we are discussing and their proper use for testing the service providers based on the two scenarios you implemented.Figure 59.
For example, the URL of the mediation flow you created in scenario #1 on WebSphere Enterprise Service Bus.Figure 65. This is because RESTful interactions are based on HTTP protocol which is pretty much stable across different software product vendors. A typical RESTful interactionThe reply from the service could take one of different representations. Alternatively, this could have been achieved using a static back end that calls the Web Service Proxy. XML is among those representations, but it could be any other format that makes sense to the service provider and consumer.
Creating a Business Object Mapper to hold the map for messages between the export and the importCreate a custom map to do the mapping within the Business Object Mapper created in the previous step.
Setting the HTTP method to POSTClick the Body tab and type “AccountNum=123” which is the payload that will be sent to the RESTful service.Figure 67. For example if an Asynchronous JavaScript and XML (AJAX) application is what to communicate with your service it would make more sense to use JavaScript Object Notation (JSON) than XML. Entering the payloadPress the Send button beside the URL field and observe the response from the RESTful service. On the other hand, the example provided later on in this article uses raw binary format to exchange data between the client and the service to stress the fact that this format is arbitrary.
The following steps shows an example of monitoring the traffic between a RESTful client and service provider using WebSphere Integration Developer.
Configuring the monitoring serverWith this configuration you should be able to monitor the traffic to your service.



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