Examples of com.google.code.gaeom.ObjectStore

com.google.code.gaeom.ObjectStore
The ObjectStore represents the mapping between the application data objects and the appengine datastore. Meta-data that represents the mapping is cached at this level as well as instances that are marked with the {@link com.google.code.gaeom.annotation.Cached} annotation. Typical usage of this class is to create a singleinstance for the JVM and re-use it. For convenience, you may decide to use the {@link Singleton} instance:
```
 ObjectStoreSession oss = ObjectStore.Singleton.get().beginSession(); 
```
Most interaction with the system is performed with the {@link ObjectStoreSession} class.Instances of this class also register classes you will be using with their kind-names in the datastore. Registration is optional - the system will generate names based on the fully qualified class name for you. Registration must be performed before the classes are accessed. @author Peter Murray

    A a = new A();


    a.name = "Fred";
    a.b.name = "Flintstone";


    ObjectStore os = ObjectStore.Factory.create();
    ObjectStoreSession oss = os.beginSession();


    Key key = oss.store(a).now();
    oss.delete(a.b).now();


    ObjectStoreSession oss2 = os.beginSession();


    oss2.load(key).retries(1).now();
    assertTrue(false);
  }

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    family.addHead(new Person("Kim"));
    family.addChild(new Person("Sam"));
    family.addChild(new Person("Maggie"));
    family.addChild(new Person("Katy"));


    ObjectStore os = ObjectStore.Factory.create();
    ObjectStoreSession oss = os.beginSession();


    Key key = oss.store(family).now();


    ObjectStoreSession oss2 = os.beginSession();


    Family family2 = (Family) oss2.load(key).now();


    assertEquals(family.name, family2.name);
    assertEquals(family.heads.size(), family2.heads.size());

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