Quali ed intents are intents that provide this additional detail beyond some existing simple intent in Java

Print PDF 417 in Java Quali ed intents are intents that provide this additional detail beyond some existing simple intent
Quali ed intents are intents that provide this additional detail beyond some existing simple intent
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In SCA, an intent may be quali ed by extending it with a and the name of some valid quali er for that intent
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In SCA, an intent may be quali ed by extending it with a and the name of some valid quali er for that intent In the case of con dentiality, there are two quali ers, which are written as sca:Con dentialityMessage and sca:Con dentiality Transport Quali ed intents are not independent intents from intents that they qualify The most important relationship between them is the fact that anything that satis es a quali ed intent also implicitly satis es the intent that it quali es This is especially useful between the various roles involved in application development If a developer requires a speci c intent, an assembler or deployer may further re ne that requirement by requiring a quali ed version of the intent Even within a single role, it is sometimes valuable to specify a more general intent that applies broadly, perhaps to everything within a composite, and then to re ne that general intent down to a speci c intent for some speci c service For example, the con dentiality intent might be speci ed on the composite, but some of its services might specify Con dentialityMessage
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Pro le Intents
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A pro le intent is a single intent that expands into other intents
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There are times when a collection of intents are so frequently used together that it makes sense to have a single intent that expands into other intents A pro le intent is such an intent The de nition of a pro le intent includes a @requires attribute that lists the intents that it should expand into Among the set of standard SCA intents, the reliability intent of sca:ExactlyOnce is a pro le intent that expands to sca:AtLeastOnce and sca:AtMostOnce As is always the case with an @requires attribute, the semantics of the list is AND all the intents must be satis ed Listing 66 presents the de nition of the sca:ExactlyOnce pro le intent
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Standard Intents Listing 66
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ExactlyOnce Intent De nition
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<intent name="ExactlyOnce" constrains="sca:binding" requires="sca:AtLeastOnce sca:AtMostOnce"> <description> The binding implementation guarantees that a message sent by a service consumer is delivered to the service implementation Also, the binding implementation guarantees that the message is not delivered more than once to the service implementation </description> </intent>
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Standard Intents
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A variety of the standardized intents have been referenced in the previous section The following is an exhaustive list of the intents that have been standardized as of SCA 10 All these intents are in the SCA namespace Security Intents The security intents include the following:
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Authentication The identity of the requestor of the
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service must be veri ed
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Con dentiality Some mechanism (such as encryption)
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must be used to prevent a message from being read by anyone other than the intended recipient of the message
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Integrity A message must be protected from being sur-
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reptitiously modi ed after it has been created (such as by attaching an electronic signature) Each of the three preceding intents have the following two quali ers:
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Transport The guarantee need only be guaranteed at the
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transport level (that is, for a single hop)
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Message The guarantee should be at the message level It should provide an end-to-end guarantee
Policy
Delivery Intents The delivery intents include the following:
AtLeastOnce At least one copy of the message must be
delivered (duplicates allowed)
AtMostOnce At most, one copy of the message must be delivered (no duplicates; dropped messages allowed) ExactlyOnce The message must be delivered once and
only once
Ordered Messages from the same client must be deliv-
ered in the same order that they were sent
Transaction Intents
Transaction intents include the following:
PropagatesTransaction The intent requires that the
other side of the wire must be able to be in the same transaction If the intent is on a reference, it means that the service provider must be able to join the transaction If it is on a service, it means that the client must be able to provide a transaction to join This must be used with ManagedTransactionglobal on the implementation
SuspendTransaction This intent goes on service and references and prevents any transaction that might be active from being shared across that wire ManagedTransaction This intent goes on implementa-
tions and means that the components must be run within some kind of transactional environment, although it may not be global Usually this means that it has to be able to use a database to do the work of a method as one atomic unit (without having to specify explicitly transaction boundaries), but doesn t need to share its transaction with its clients or its downstream services
ManagedTransactionGlobal This is a quali ed intent that extends ManagedTransaction to say that the transaction must be one that can enlist upstream or downstream components