Insights to EMF

An overview of EMF in context of MOIN

EMF – Eclipse Modeling Framework

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Memory Management in EMF

central concept: Resource Sets

Persistence via serialization to files

CDO Extension: store models in databases

stress tests with standard EMF

1,5 GB Heap Space

Using dynamic EMF (no code generation, models in memory)

Out of Memory Error at:

2.7 million instances of

1.7 million classes in meta modelAClass NextClass

0..*

0..*Attribute:Int

EMF Event Handling

adapter mechanism attach listeners to specific

model elements

workbench events register for changes of

ressources

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MOIN Event Handling to EMF

ModelChangeEvents Adapters

PartitionChangeEvents Workbench

PreChangeEvents

EventFilter

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OCL in EMF

Different OCL Interpreters

Define constraints on metamodels

interpret OCL constraints with EMF Queries

emfQueryStatement =

new SELECT(

new FROM(selectedEObjects),

new WHERE(

new EObjectAttributeValueCondition(

RMPLibraryPackage.eINSTANCE. PERSON__AGE,

new NumberCondition<Integer>(25) )

)

)

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EmfIndex

■ indexing EMF-based models and instances

■ collection of index data

■ persisting index data

■ querying without loading any EMF resources

■ Synchronization

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