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There is a performance hit on your Application when EOSharedEditingContexts are enabled. If your application does not use them, you should call:
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EOSharedEditingContext.setDefaultSharedEditingContext(null); |
in your Application constructor. This will disable shared editing contexts completely, and you will no longer see any performance loss.
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Then, in Application I have two methods:
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public static void refreshSharedEntity(String entityName) throws MarvinGeneralException { Application.refreshSharedEntityForFetchSpecificationName(entityName, "FetchAll");
}
public static void refreshSharedEntityForFetchSpecificationName(String entityName, String fetchSpecName) throws MarvinGeneralException { EOModelGroup modelGroup = EOModelGroup.defaultGroup();
EOSharedEditingContext sharedEC =
EOSharedEditingContext.defaultSharedEditingContext();
EOFetchSpecification fs = modelGroup.fetchSpecificationNamed(fetchSpecName, entityName);
if (fs == null) {
throw new MarvinGeneralException(Application.class.getName() + ".refreshSharedEntityForFetchSpecificationName", entityName + "." + fetchSpecName + " doesn't exist"); } else {
sharedEC.bindObjectsWithFetchSpecification(fs, fetchSpecName);
}
}
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I use these methods for updating the shared editing context for a specific entity.
As an example for an entity, I have the methods:
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public static NSArray enclosureMasters() { NSDictionary objectsByEntityName = (NSDictionary)EOSharedEditingContext.defaultSharedEditingContext() .objectsByEntityNameAndFetchSpecificationName(); NSDictionary objectsForEnclosureMaster = (NSDictionary) objectsByEntityName.objectForKey("EnclosureMaster");
NSArray enclosureMasters = (NSArray) objectsForEnclosureMaster.objectForKey("FetchAll");
return enclosureMasters;
}
public static NSArray enclosureMasters(String fetchSpecName, NSDictionary bindings) {
// filter in memory against all enclosure masters
// EOQualifier.filteredArrayWithQualifier( NSArray objects, EOQualifier aQualifier)
if (bindings == null) bindings = new NSDictionary();
EOFetchSpecification fetchSpec = EOFetchSpecification.fetchSpecificationNamed(fetchSpecName, "EnclosureMaster");
EOQualifier boundQualifier = fetchSpec.qualifier().qualifierWithBindings(bindings, fetchSpec.requiresAllQualifierBindingVariables()); if (boundQualifier == null) return
EnclosureMaster.enclosureMasters(); // return all -
// otherwise the next call will give us an empty array
NSArray results = EOQualifier.filteredArrayWithQualifier(EnclosureMaster.enclosureMasters(), boundQualifier);
// we should now use the fetchSpec's sort orderings to sort the results
NSArray sortedResults = results;
NSArray sortOrderings = fetchSpec.sortOrderings();
if (sortOrderings != null)
sortedResults = EOSortOrdering.sortedArrayUsingKeyOrderArray(results, sortOrderings);
return sortedResults;
}
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These two methods let me fetch all objects of a certain type and, even better, let me use my other fetch specs on these objects.
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When you addd a new object you have to reload by calling, for example,
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Application.refreshSharedEntity("EnclosureMaster"  ;); |
When you edit or delete a shared entity the SharedEditing context will take care of updating the objects it's holding.
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