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Web service contract versioning


web service contract versioning

This "super-strict" approach is not really that practical, but it is the safest and hackmii installer v0 5 sometimes warranted when there are legal implications to Web service contract modifications, such as when contracts are published for certain inter-organization data exchanges.
Yy.zzz 9/5/2013service versioning.
Ignorable policy assertions can be defined to communicate service characteristics that can optionally be acknowledged by future consumers.Version mediation strategies Context-based routing URL selection Content-based routing Version ID Consumer ID 9/5/2013service versioning.No standards Proprietary service repository.Authentic source versioning 9/5/2013service versioning 22 Crossroads Bank for Enterprises Crossroads Bank for Social Security National Register for Person Data Single funky monkey babys namida concurrent version Big-Bang versioning Version ID in xsd version attribute Single concurrent version Big-Bang versioning Version ID hardcoded in namespace Single concurrent version Big-Bang.These are discussed at the end of Chapter.portType name"ptPurchaseOrder" operation name"opSubmitOrder" input output /operation operation name"opCheckOrderStatus" input output /operation operation name"opChangeOrder" input output /operation operation name"opCancelOrder" input output /operation operation name"opGetOrder" input output /operation /portType /definitions Example 2: The addition of a new operation represents a common backwards-compatible change.This is an especially important consideration for agnostic services that are heavily reused.Technology versus governance Technology Governance 9/5/2013service versioning 18 wsdl XML schema Very popular Well understood Imposes versioning strategy Strict, flexible, loose Great tool support Standards-based Organizational processes Less well understood Service-level agreements Must define versioning strategy in soft document Tool support?Backwards Compatibility, a new version of a Web service contract that continues to support consumer programs designed to work with the old version, is considered backwards-compatible.WS-versioning proposal What we need is WS-Versioning Defines context-based and/or content-based version routing Defines soap header elements required for service version mediation End points, client identifiers, service version identifiers, Abstract end point for mediator.: m/myService Specific end point only known by mediator.: local.Xsd:element name"LineItem" type"LineItemType xsd:complexType name"LineItemType" xsd:sequence xsd:element name"productID" type"xsd:string xsd:element name"productName" type"xsd:string xsd:any minOccurs"0" maxOccurs"unbounded" namespace any" processContents"lax /xsd:sequence xsd:anyAttribute namespace any /xsd:complexType Example 1: A complexType construct containing fine and coarse-grained constraints.So the strategy is less important; you get a new major version anyway 9/5/2013service versioning 12 Strategy New major New minor New point Strict Incompatible change Compatible change Flexible Incompatible change Compatible change Loose Incompatible change.



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These are the types of changes that can break an existing contract and therefore impose the most challenges when it comes to versioning.
Both Strict and Loose approaches increase governance impact but for different reasons.
This means that program version.0 is not expected to be backwards compatible with version.0.
Therefore, this approach will increase the governance burden of individual services and will require careful transitioning strategies.For example: The anyType attribute value provided by the wsdl.0 language allows a message to consist of any valid XML document.The first step to establishing an effective versioning strategy is to decide on a common means by which versions themselves are identified and represented within Web service contracts.Updating a hardcoded XML namespace version number is breaking the contract!Grammar-based versus rule- based Compatibility contracts can be achieved either way: Grammar-based compatibility Defines exactly how the service communication protocol must be followed by both service provider and client All service clients have the same compatibility contract Example: wsdl and XML Schema Rule-base compatibility Defines.Note: All three corel draw x5 keygen utorrent strategies will be referenced in upcoming chapters as we explore how versioning can be accomplished with the wsdl, XML Schema, and WS-Policy languages.Service Z v2 New incompatible version Service X.Pros and Cons, the benefit of this strategy is that you have full control over the evolution of the service contract, and because backwards and forwards compatibility are intentionally disregarded, you do not need to concern yourself with the impact of any change in particular.




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