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Establishing SOA Governance at Your Organization in .NET Implement EAN-13 Supplement 5 in .NET Establishing SOA Governance at Your Organization




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Establishing SOA Governance at Your Organization use visual .net gs1-13 generation tomake ean13+5 with .net iPhone OS Service Contracts With the standards fo r communication established, the infrastructure can now focus on the enforcement of the policies within service contracts. Some policies may be common to all service contracts, consistent with the policies that are in place in the reference architectures. For example, if the service technology reference architecture states that only XML payloads are allowed, this should be reflected in all service contracts.

Any service message received by the communications infrastructure that does not contain an XML payload should be rejected. While many of these policies can, and should be tested at development time, they must also be enforced at run-time, whether to deal with unknown bugs in the consumer or provider, protection against rogue applications that didn"t follow appropriate testing procedures, or in case of external consumers, because we don"t know what testing was performed at development time. In addition, there are behaviors that cannot be handled by development time testing, typically associated with SLA enforcement point.

A capacity test can be done to verify that the system behaves properly when 1,000 users of a service consumer are sending simultaneous requests, but this can"t account for a mistake in analysis of the user base. If the real number is 10,000 users, how do we prevent the system from being overwhelmed Each individual message may be fully compliant with all standards, but it"s the fact that a much higher rate of message traffic is occurring that can create the problem. The service contract must specify the expected usage by the consumer in an appropriate level of detail, as well as the expected response time from the provider when the system is behaving as expected.

Additionally, thresholds for both usage by the consumer and response time from the provider must be established. Exceeding these thresholds results in notifications, allowing corrective action to be taken before a problem occurs, or a switch to a mode of self-preservation, where requests will be rejected in order to protect the back end service implementation from a complete failure. The infrastructure must be capable of changing the policies associated with a contract, or establishing new contracts, without requiring a deployment of a new version of the service or the consumer solely for that reason.

It is common that a change in contract may accompany an associated functionality change in a service consumer, service provider, or both, but it is the functionality change that drives the implementation change and the contract change. We never want a contract change to require an implementation change..

[ 194 ]. 8 . The service contract .net vs 2010 ean13+2 must also address reporting policies for service usage. The desired behavior at run-time should never be to deploy a service in production and then ignore it unless the system tells us otherwise.

Usage reports should be provided to each consumer, as well as to the service provider. Analysis of these reports may trigger a change in policy, or even a need for a capacity modification, if the reports indicate the usage characteristics are changing..

Policies for Run-Time Governance The following are que ean13+2 for .NET stions or policies that you should consider in your run-time governance efforts: What is the normal rate of requests for a given service consumer What is the expected response time for the service provider for typical requests from that service consumer What actions are taken when the request rate for a given service consumer exceeds each of the agreed upon thresholds What actions are taken when the response time for a given service consumer exceeds each of the agreed upon thresholds Are there any time restrictions on when a particular consumer can access a service For services with multiple entry points via different technologies (for example, SOAP/HTTP, XML/HTTP, SOAP/JMS), is policy enforcement defined and consistent (if needed) for each entry point Are all security policies configured and being enforced Are service requests routed to the appropriate version for each consumer, or have appropriate transformations been applied, preserving backward compatibility Are all service messages being logged appropriately per any enterprise auditing requirements Are all service messages being logged and preserved for the purpose of debugging Are usage metrics being properly collected Are usage reports being generated and distributed appropriately Are the recipients of these reports properly reviewing them and accounting for any discrepancies in behavior .
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