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<ExactlyOne> <A/> <B/> <All><A/><B/></All> </ExactlyOne>
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So, inclusive OR is possible; it is just ugly Because WS-Policy doesn t de ne any policy assertions, it must leave those to other speci cations Some of the speci cations that de ne standard policy assertions include WS-AT, WSSecurityPolicy, or WS-ReliabilityPolicy
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There is one nal important concept that WS-Policy de nes, as follows: Policy intersection This is used for determining if two policies are compatible The two policies are set side-byside, and any place one side has an exactlyOne, the other side has to have a policy expression that matches one of the alternatives (possibly also within an exactlyOne) The intersection continues in a predictable manner given the concepts de ned previously One thing that is noteworthy about WS-Policy intersection is that it is symmetric The service provider and the service client both specify policy expressions, and the two sides are treated the same This may seem odd at rst, because service providers seem like the more natural place to declare requirements on any client of that service (After all, WSDL is only de ned for the provider side, not for clients) But, in fact, clients may sometimes have requirements of their own, which need to be communicated to whatever human or system is going to be nding a matching service Returning to our example, consider the one wire between the Credit and the Scoring components (see Figure 62)
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Each of these intents will resolve to the same policySet namely, the policySet mentioned previously:
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<policySet provides="propagatesTransaction" appliesTo="bindingws"> <wsat:ATAssertion/> </policySet>
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The policy infrastructure requires the intersection of the policies on each end of the wire in order to determine the policy actually used
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In this case, this becomes the intersection of a policySet with itself, so the intersection is the same as the original policySet Because the <wsat:ATAssertion/> policy assertion is present on the wire, the transaction will be propagated
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SCA also de nes a few intents related to the reliability of one-way messaging Let s return to the application presented in 5, Composition, but this time after it ended up looking like what is shown in Figure 63
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LoanApplicationComposite
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Promoted reference
Big Bank s top-level composite
The outermost composite in this picture is shown in Listing 63
Listing 63
Wiring to the Audit Component
<composite name="LoanApplicationComposite"> <component name ="CreditComponent"> <implementationcomposite name="loan: CreditServiceComposite"/> <reference name="auditService" target="AuditComponent"/>
Policy <component> <component name ="AuditComponent"> <implementationjava class="combigbankAuditComponent"/> <component>
</composite>
We haven t previously looked at the interface for the AuditComponent, so let s do that now AuditComponent will have a single @OneWay operation called auditEntry, which takes as a parameter a string representation of the auditable step that needs to be recorded (see Listing 64)
Listing 64
Interface for the AuditComponent
import orgosoascaannotationsOneWay; @Remotable public interface AuditComponent { @OneWay void auditEntry(String entry); }
The operation is a one-way operation, because it does not want to slow down the normal ow of the business logic However, it is also important that the audit entries not get lost! This is where policy can help We should add the following requirements to this wire:
exactlyOnce So that we don t lose any audit entries, and
none get entered multiple times
authentication So that no one forges an audit entry integrity So that the entries are signed, preventing third-party modi cation of the audit entry
To add these requirements to LoanApplicationComposite, all that is necessary is to add an entry for each of these requirements into a @requires attribute of the reference (see Listing 65)
Quali ed Intents Listing 65
Wiring to the AuditComponent
<composite name="LoanApplicationComposite"> <component name ="CreditComponent"> <implementationcomposite name="loan:CreditServiceComposite"/> <reference name="auditService" target="AuditComponent" requires="exactlyOnce authentication integrity"/> <component> <component name ="AuditComponent"> <implementationjava class="combigbankAuditComponent"/> <component> </composite>
Quali ed Intents
There are times when a developer might want to specify more about how a generic capability is going to be provided than is possible with simple intents Quali ed intents are intents that provide this additional detail beyond some existing simple intent Consider the con dentiality intent that was introduced at the beginning of this chapter Con dentiality is typically accomplished through encryption, although different mechanisms exist Some handle encryption on a point-to-point basis This is typically called transport-level encryption Other techniques exist to encrypt a message in such a way that intermediaries can process and route the message without decrypting the body of the message This is called message-level encryption If a developer speci es that she requires sca:Con dentiality on a reference, this does not constrain the kind of encryption technique that is used However, some developers may know enough about the data and the way it is supposed to be protected to know that message-level encryption is required In this case, it should be possible to require message-level encryption, but still to do it at the level of intents, rather than having to dive down into the details of a speci c binding