Figure 14-6 Successful BusinessAgreementWithCoordinatorCompletion in .NET framework

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Figure 14-6 Successful BusinessAgreementWithCoordinatorCompletion
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If the business activity uses the protocol BusinessAgreementWithParticipantCompletion, the result is very similar The only difference is that the completion process is not initiated with the Complete message from the coordinator, but with theCompleted message from the participant Figure 14-7 shows a sequence with one participant returning a failure As in the sequence before, the coordinator initiates the completion sequence with the Complete message that is sent to the participants Participant B answers with theFault message rather than the Completed message The fault is accepted by theFaulted message from the coordinator The participant that successfully answered with the Completed message now receives the Compensate message from the coordinator Participant A can now undo the actions done earlier and sends the Compensated message after the undo action is completed
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Figure 14-7 Compensating BusinessAgreementWithCoordinatorCompletion
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Comparing Business Activities with Atomic Transactions
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An atomic transaction must be completed in a short time span, because with atomic transactions, resources are locked With business activities, individual tasks can be seen from the outside, because resources are not locked You begin the process of undoing a business activity action by starting a compensation action One activity inside a business activity may be implemented by using atomic transactions
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Security
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[12] Security with Web services must cover all the aspects of security discussed thus far with regard to Enterprise Services Because distributed solutions are accessing services across different organizations more frequently, security with Web services must cover an even broader range of security issues Figure 14-8 shows a typical scenario in which a client (requester) invokes a Web service through an intermediary The intermediary service forwards the request to the target Web service If you compare the security requirements of this scenario with impersonation and delegation (as shown in 12, "Security"), this is only one of the issues with the intermediary The intermediary can do some preprocessing before the request is forwarded, and the intermediary can be hosted by a different organization than the target Web service This can make it necessary for part of the message that is sent by the requester to be read by the intermediary, whereas the intermediary is not allowed to read the part of the message that is directed to the target Web service Security must not only be possible with direct connections from the requester to the intermediary and the intermediary to the target Web service, but it must also span the way from the requester to the target Web service
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Figure 14-8 Using intermediaries
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[13] The base of all security issues is defined with the SOAP Message Security specification, which is in the hands of OASIS This security specification defines how security token formats (username, X509 certificates, Kerberos tickets), signature formats, and encryption technologies can be specified with a SOAP message Listing 14-7 shows an example of how a username can be passed in a SOAP header
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Listing 14-7 Passing a Username in the SOAP Header
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<soap:Envelope xmlns:soap="http://wwww3org/2001/12/soap-envelope" xmlns:wsse="http://schemasxmlsoaporg/ws/2003/06/secext"> <soap:Header> <wsse:Security soap:role="" soap:mustUnderstand="true"> <wsse:UsernameToken> <wsse:Username>Ebony</wsse:Username> </wsse:UsernameToken>
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The Enterprise Services features such as authentication, authorization, and secure data transfer are covered by the SOAP Message Security specification for Web services Other Web service security specifications extend the specification from OASIS Here are a few of them:
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Web Services Trust Language (WS-Trust) For a secure communication between two parties, the parties must exchange security credentials How this is done is defined in the base specification However, these two parties must trust the security credentials of the other party Within this specification, it is defined how security tokens can be issued and exchanged and how trust relationships can be established Web Services Secure Conversation Language (WS-SecureConversation) The WS-SecureConversation specification defines how security contexts can be established and how keys can be passed between parties WS-Secure-Conversation makes use of WS-Trust if a security token service is used Web Services Federation Language (WS-Federation) Federation is about security with different organizations It is not a good idea for the client system and the Web service system, which are located in different organizations, to be directly responsible for the security between the two parties Instead, the security should be defined by the two organizations, independent of the systems that take place in the conversation Federation servers build up a trust between different organizations that interact Federation defines terms, keys, and auditing requirements; how the identity can be shared; and how security token exchange occurs The specification also defines how attributes between organizations can be shared (for example, by using a UDDI service as an attribute store) With federation, not every application has to deal with these issues itself [14]
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All these Web service specifications are not useful without an implementation WSE Indigo will implement all the features defined by these specifications
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implements just a few of these specifications;
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