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Service Versioning in .NET Generate ean13 in .NET Service Versioning




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Service Versioning generate, create ean13 none for .net projects GS1 DataBar Overview In this example, .net framework ean13+5 the namespace element of the message is http://schemas. advasco.

com/books-records/customer/nov-2008/. At the end of the URI for the namespace, there is a month and date that can tell the recipient of the message that the schema used in this message corresponds to the November 2008 version of the Customer schema. It is entirely possible that even the namespace of the message may not contain an explicit version identifier; however, the version of the message can be determined by looking for the inclusion, or exclusion, of specific message elements.

Another example of a SOAP request could be the following:. <soap:Envelope xmlns :soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.

w3.org/2001/XMLSchema-instance" xmlns:s="http:// www.w3.

org/2001/XMLSchema" xmlns:tns="http://www.advasco.com/"> <soap:Header> <wsse:Security xmlns:wsse="http://docs.

oasis-open.org/wss/2004/01/ oasis-200401-wss-wssecurity-secext-1.0.

xsd"> <wsu:Timestamp xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/ oasis-200401-wss-wssecurity-utility-1.

0.xsd" wsu:Id="Timestampaaddaaf5-1207-44d7-a5ab-64b6bf5f678e"> <wsu:Created>2008-05-27T21:23:25Z</wsu:Created> </wsu:Timestamp> <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.

org/ wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu: Id="SecurityToken-53f28e17-d945-4966-aef1-3ab95e680721"> <wsse:Username>jdoe</wsse:Username> <wsse:Password Type="http://docs.

oasis-open.org/wss/2004/01/oasis200401-wss-username-token-profile-1.0#PasswordDigest">2gy4KlZvottIW989 aDMD6JTL/Mk=</wsse:Password> <wsse:Nonce>EqJ39Y6g6V+X9XgLIwx1Wg==</wsse:Nonce> <wsu:Created>2008-05-27T21:23:25Z</wsu:Created> </wsse:UsernameToken> </wsse:Security> </soap:Header> <soap:Body> <tns:GetCustomer> <tns:customer-id>abc123</tns:customer-id> </tns:GetCustomer> </soap:Body> </soap:Envelope>.

In this example, neithe visual .net ean13+5 r the URL for the request nor the XML namespace gives any indication of the version of the service desired. The only thing this message has is the identity of the consumer.

This example uses the WS-Security UsernameToken profile and specifies a username of jdoe. Through the use of a service contract, this consumer can now be associated with a particular version of the service via policies. An intermediary can receive the message, check the policies associated with the.

[ 84 ]. 4 . contract for this consu mer, and then either route to the appropriate endpoint or apply transformations to preserve backward compatibility.. Extending the Service Contract In 2, we introduced th e service contract, which is an explicit representation of the relationship between a consumer and a provider. The contract initially focused on providing a functional interface, along with a delivery schedule, if the service did not exist yet. However, there is much more to the service contract.

The contract needs to also specify the policies that govern the run-time behavior of the service. In the example in this chapter, two run-time policies are required to enable the behavior that was described. The first is that the request needed to contain appropriate credentials to identify the source of the request.

The second is that the request needs to be routed to a specific version of the service. While this may not seem important with the initial service implementation and its consumers, as soon as the next consumer comes along and requires a modification, as was the case in our example, this policy becomes very important..

Policy-Driven Infrastructure One reason for the form alization of the service contract is to allow the infrastructure to easily enforce the policies. First made popular in the context of web access management solutions, policy-driven infrastructure has four primary components as shown in the following figure:. Policy Management Point Policy Enforcement Point Policy Decision Point Policy Information Point The first component is .NET EAN13 the policy management point, also known as the policy administration point. This is where the administrator would enter the policies associated with the service contract.

The policy management point would also be the place where management services would be exposed for data center automation opportunities.. [ 85 ]. Service Versioning The second component is the policy information point. This is the backing repository where policies entered via the policy management point are stored. When applied to SOA, the Service Registry/Repository can play the role of the policy information point.

Moving into the actual run-time path of requests, the third component is the policy enforcement point. This is where requests are intercepted and any applicable policies are enforced. The final component, which is frequently co-located with the policy enforcement point, is the policy decision point.

This is where the decision is taken on what to do when enforcing each policy. To understand the relationship between a policy enforcement point and a policy decision point, consider a real world example. If you are driving a car and reach an intersection with traffic signals, you are at the policy enforcement point.

All cars must pay attention to the state of the traffic signal to determine whether they can proceed in their desired direction or not. The traffic signal itself is the policy decision point. Based upon embedded sensors in the street or timers, the light is either red, amber, or green, which represents the decision on how to handle traffic from each direction.

In this example, the policy enforcement point and the policy decision point are co-located. Now, suppose you have driven your car to the entrance of a gated community. The gate, however, is unmanned.

Instead, there is either a video camera or an intercom at the gate. The gate represents the policy enforcement point. The policy decision point, however, is not at the gate.

The policy decision point is wherever the security personnel is sitting watching the feed from the camera or listening to the audio from the intercom. Putting this in the context of our versioning example, a request from a service consumer would be intercepted by the policy enforcement point. The policy enforcement point would extract the message content, and hand it off to a policy decision point.

The policy decision point would examine all applicable policies for the service requested from the policy information point. There will be some policies that are universally applied, such as requiring that some form of identity be on all service requests. From that point, the identity can be authenticated and authorized, according to the policies in the service contract.

Once identity is established, policies that may be specific to the service contract between the specific consumer associated with the identity provided and the service being requested can be enforced, such as what version of the service should receive the request, and whether any of the transformations will be applied. All of these policies should already be in the policy information point as a result of previous actions by an administrator via the policy management point..

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