
(object Petal
    version    	50
    _written   	"Rose 8.3.0407.2800"
    charSet    	0)

(object Class_Category "persistence"
    is_unit    	TRUE
    is_loaded  	TRUE
    quid       	"4472EA830302"
    documentation 	
|Persistence modeling cronstructs. This can primarily be used to tell whether an entity class shall have persistence support or not. Specific mark-up may be provided for associations.
|
|The package also will allow developers to specify concurrency control aspects, such as the locking style to use for a transaction or an entity class. Developers also need to be able to specify how persistent data is to be "partitioned" in the sense of defining the granularity for locking and fetching data.
|
|Furthermore, this package may contribute specific actions to make entity objects persistent and delete persistent objects.
|
|The package also has to define the semantics of persistence in the first place, such as how persistence affects the semantics of queries.
|
|TODO Does marking an entity class as persistent mean that there is this kind of "virtual" top-level "collection" of instances of this class which then can be queried and referred to by name? Is it like the topmost container that guarantees reachability and therefore allows for a garbage collection semantics "by reachability?"
|
|TODO Perhaps this package should be separated out into an own top-level metamodel package because it has dependencies on behavioral/actions and dataaccess/expressions.
    
    stereotype 	"metamodel"
    exportControl 	"Public"
    logical_models 	(list unit_reference_list
	(object Class_Category "actions"
	    quid       	"4979C042005B"
	    exportControl 	"Public"
	    logical_models 	(list unit_reference_list
		(object Class "Store"
		    quid       	"4979C056001D"
		    documentation 	
|Marks an entity object or multi-object as persistent. It will be stored in the repository, producing a new snapshot on calling commit. 
|Together with the object(s) produced by the *argument* expression, all their composite children are stored by this statement, too, and so are all links attached to any of these objects as well as all value objects that are relevant for the equality of any of the objects stored.
|
|TODO clarify the storing of deletions
		    
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			    supplier   	"Logical View::persistence::actions::StatementWithEntityArgument"
			    quidu      	"497A4BFB0037")))
		(object Class "Delete"
		    quid       	"497A4BE10316"
		    documentation 	"Deletes the one or multiple entity objects from the repository including its composite children and all attaching links."
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			    quid       	"497A4BE703A7"
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			    quidu      	"497A4BFB0037")))
		(object Class "StatementWithEntityArgument"
		    quid       	"497A4BFB0037"
		    superclasses 	(list inheritance_relationship_list
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			    quidu      	"492573460213"))
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			    quid       	"4979C0D902AD"
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				(object Operation "OCL"
				    quid       	"4979C0E6007A"
				    concurrency 	"Sequential"
				    semantics  	(object Semantic_Info
					PDL        	
|context StatementWithEntityArgument
|inv:
|  if self.argument.getType().oclIsKindOf(data::classes::ClassTypeDefinition) then
|    not self.argument.getType().oclAsType(data::classes::ClassTypeDefinition).clazz.valueType
|  else
|    false
|  endif
					)
				    opExportControl 	"Public"
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		(object Class "Rollback"
		    quid       	"4981A0120399"
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		    quid       	"4979C05D009A"
		    title      	"Persistence Actions"
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			    quid       	"498C3F3D0186"
			    documentation 	"A selector for the snapshot to read. If DEFAULT, the entities will be read from the current session's default snapshot. If ALL is specified, all copies of instances in all snapshots is returned. If DATE, the lastSnapshotBeforeIsoTimestamp has to be set and all snapshots before that date are selected for which no successor exists that still lies before the timestamp specified. This means that the entity will be returned from all snapshots on concurrent branches that existed at the given point in time."
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				    quid       	"4979C468003C"
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				    semantics  	(object Semantic_Info
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|context All
|inv:
|  not self.ofClass.valueType
					)
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				    quid       	"49AE836D013A"
				    concurrency 	"Sequential"
				    semantics  	(object Semantic_Info
					PDL        	
|context All
|inv:
|  if self.snapshot = SnapshotSelection::SPECIFIED then
|    self.snapshotIdentifier.getType().upperMultiplicity = 1 and
|    self.snapshotIdentifier.getType().oclIsKindOf(data::classes::ClassTypeDefinition) and
|   Set{'Snapshot', 'TimePoint'}->includes(self.snapshotIdentifier.getType().oclAsType(data::classes::ClassTypeDefinition).clazz.name)
|  else
|    true
|  endif
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		    quid       	"4981A010001F"
		    documentation 	"Returns the Snapshot produced"
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			    quid       	"49AC5E6D0029"
			    supplier   	"Logical View::dataaccess::expressions::Expression"
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				    quid       	"49AC5EBE0123"
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					PDL        	
|context Commit
|inv:
|  self.getType().oclIsKindOf(data::classes::ClassTypeDefinition) and
|  self.getType().oclAsType(data::classes::ClassTypeDefinition).clazz.name = 'Snapshot'
					)
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