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As application developers, we identify an object using Java object identity (a==b). If an object changes state, is the Java identity guaranteed to be the same in the new state In a layered application, that may not be the case. In order to explore this, it s extremely important to understand the relationship between Java identity, a==b, and database identity, x.getId().equals( y.getId() ). Sometimes they re equivalent; sometimes they aren t. We refer to the conditions under which Java identity is equivalent to database identity as the scope of object identity. For this scope, there are three common choices:

A primitive persistence layer with no identity scope makes no guarantees that if a row is accessed twice the same Java object instance will be returned to the application. This becomes problematic if the application modifies two different instances that both represent the same row in a single unit of work. (How should we decide which state should be propagated to the database ) A persistence layer using persistence context-scoped identity guarantees that, in the scope of a single persistence context, only one object instance represents a particular database row. This avoids the previous problem and also allows for some caching at the context level. Process-scoped identity goes one step further and guarantees that only one object instance represents the row in the whole process (JVM).

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8. In Connection 2, execute the following SQL statements to start a transaction, and acquire an exclusive lock on one row in the test table.

The -memberof switch returns the value of the MemberOf attribute, showing the groups to which the user directly belongs. By adding the -expand switch, those groups are searched recursively, producing an exhaustive list of all groups to which the user belongs in the domain.

For a typical web or enterprise application, persistence context-scoped identity is preferred. Process-scoped identity does offer some potential advantages in terms of cache utilization and the programming model for reuse of instances across multiple units of work. However, in a pervasively multithreaded application, the cost of always synchronizing shared access to persistent objects in the global identity map is too high a price to pay. It s simpler, and more scalable, to have each thread work with a distinct set of persistent instances in each persistence context. We would say that Hibernate implements persistence context-scoped identity. So, by nature, Hibernate is best suited for highly concurrent data access in multiuser applications. However, we already mentioned some issues you ll face when objects aren t associated with a persistence context. Let s discuss this with an example. The Hibernate identity scope is the scope of a persistence context. Let s see how this works in code with Hibernate APIs the Java Persistence code is the

-- Connection 2 BEGIN TRAN; UPDATE Test.TestTable SET Col2 = Col2 + 1 WHERE Col1 = 1;

equivalent with EntityManager instead of Session. Even though we haven t shown you much about these interfaces, the following examples are simple, and you should have no problems understanding the methods we call on the Session. If you request two objects using the same database identifier value in the same Session, the result is two references to the same in-memory instance. Listing 9.1 demonstrates this with several get() operations in two Sessions.

Session session1 = sessionFactory.openSession(); Transaction tx1 = session1.beginTransaction(); // Load Item with identifier value "1234" Object a = session1.get(Item.class, new Long(1234) ); Object b = session1.get(Item.class, new Long(1234) ); ( a==b ) // True, persistent a and b are identical tx1.commit(); session1.close(); // References a and b are now to an object in detached state Session session2 = sessionFactory.openSession(); Transaction tx2 = session2.beginTransaction(); Object c = session2.get(Item.class, new Long(1234) ); ( a==c ) // False, detached a and persistent c are not identical tx2.commit(); session2.close();

9. In Connection 1, execute the following transaction to try to read the row that has been updated (but not committed) by Connection 2. After you execute the code in this step, move on to the next step, as this connection will now be blocked.

In this practice, you will work with group memberships and nesting to identify which combinations of group memberships are possible.

Object references a and b have not only the same database identity, but also the same Java identity, because they re obtained in the same Session. They reference the same persistent instance known to the persistence context for that unit of work. Once you re outside this boundary, however, Hibernate doesn t guarantee Java identity, so a and c aren t identical. Of course, a test for database identity, a.getId().equals( c.getId() ), will still return true. If you work with objects in detached state, you re dealing with objects that are living outside of a guaranteed scope of object identity.

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