Hey guys,
SimpleDS is a Java persistence framework for GAE (think Objectify, but
different). This release includes the following:
*Serialize attributes as JSON*
Something similar to what NDB introduced lately, you can choose between
@Embedding a composite object or serializing it @AsJSON:
@Property @AsJSON
> private AcmeObject myObject;
These fields get stored as Text attributes, which means that you cannot
include them as query arguments (not that it would make any sense). We are
using Jackson for JSON serialization/deserialization, so you can use
anything in org.codehaus.jackson.annotate.
*Predicates*
Guava Predicates are now easier to use than ever:
@Override
> public CursorList<Whatever> findByUser(Key userKey, boolean
> includeOldData, Cursor cursor) {
> return entityManager.createQuery(Whatever.class)
> .equal("userKey", userKey)
> .withPredicate(includeOldData? null : new Predicate<Performance>() {
> @Override
> public boolean apply(Whatever input) {
> return !input.isOld();
> }
> })
> .withStartCursor(cursor)
> .sortAsc("date")
> .asCursorList(20);
> }
This should save you some indexes in your datastore, and is a great way to
implement filters based on a condition (such as the example above). As with
anything else, setting the predicate to null is just a no-op.
Predicates are supported for any method that returns List, CursorList,
CursorIterable and CursorIterator instances.
*Demo app*
This was an issue long overdue. We have put together a kickstart
application at https://github.com/icoloma/simpleds-kickstart/
It is an introduction to put together SimpleDS, Jersey and AppEngine in a
gradle project. You can play with the demo online
at http://simpleds-kickstart.appspot.com/
*Removed dependencies*
We have reduced the list of dependency JARs required to deploy. JPA
annotations are not supported anymore, and you do not need any Spring JARs
anymore. The only two required dependencies that remain should be jackson
for JSON serialization and slf4j for logging.
We have also moved from Google code to GitHub. All the wiki contents have
been migrated to https://github.com/icoloma/simpleds/wiki/ - looks as hell,
but we will eventually work on that.
Next in our roadmap: async operations and get partial entities (hopefully,
with a shorter release cycle).
Merry Christmas to everyone!
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