Hi all,
for the project I'm working in I need to change the caching
behaviour of Slide. Looking at StandardStore, which does the
caching, I wonder:
If caching is disabled, read calls are forwarded to super
(AbstractStore), which then calls the actual Store
implementation.
If caching is enabled but the object to read is not in the
cache, the calls are not forwarded to super but to the actual
Store implementation, e.g. DescriptorsStore.
Why is it done this way? Is it just style?
When super is called, the Stores are listed in a transaction...
I think this is important to understand when I change the way
the caching is done.
Please see one example below.
Thanks.
Andreas
StandardStore:
public ObjectNode retrieveObject(Uri uri)
throws ServiceAccessException, ObjectNotFoundException {
if (nodeStore.cacheResults()) {
Object tempObject =
objectsCache.get(uri.toString());
if (tempObject != null) {
return ((ObjectNode) tempObject).cloneObject();
} else {
ObjectNode objectNode =
nodeStore.retrieveObject(uri);
objectNode.validate(uri.toString());
objectsCache.put(uri.toString(),
objectNode.cloneObject());
return objectNode;
}
} else {
return super.retrieveObject(uri);
}
}
AbstractStore:
public ObjectNode retrieveObject(Uri uri)
throws ServiceAccessException, ObjectNotFoundException {
ObjectNode objectNode = null;
if (isForceStoreEnlistment(uri)) {
enlist(nodeStore);
try {
objectNode = nodeStore.retrieveObject(uri);
} catch (ServiceAccessException e) {
delist(nodeStore, false);
throw e;
} catch (ObjectNotFoundException e) {
// Note : Failed reads aren't considered fatal
(ie, the
// transaction won't be always rolledback when
committed)
delist(nodeStore);
throw e;
} catch (Throwable t) {
delist(nodeStore, false);
// Wrap everything else in a
ServiceAccessException
throw new ServiceAccessException(nodeStore, t);
}
delist(nodeStore);
} else {
try {
objectNode = nodeStore.retrieveObject(uri);
} catch (ServiceAccessException e) {
throw e;
} catch (ObjectNotFoundException e) {
throw e;
} catch (Throwable t) {
// Wrap everything else in a
ServiceAccessException
throw new ServiceAccessException(nodeStore, t);
}
}
objectNode.validate(uri.toString());
return objectNode;
}
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