Examples of com.sun.sgs.app.DataManager

com.sun.sgs.app.DataManager
Provides facilities for managing access to shared, persistent objects. Managed objects are objects that implement the {@link ManagedObject} and{@link Serializable} interfaces. Each managed object is stored separatelyalong with all of the serializable, non-managed objects it refers to. If a managed object refers to another managed object, it must do so through an instance of {@link ManagedReference}, created by the {@link #createReference createReference} method. Attempting to store a reference to a managedobject using a standard reference rather than an instance of ManagedReference will typically result in an {@link ObjectIOException} being thrown when the current transaction commits.
Managed objects that are bound to names, and any managed objects they refer to directly or indirectly, are stored by the DataManager. It is up to the application to determine when managed objects are no longer needed and to remove them explicitly from the DataManager using the {@link #removeObject removeObject} method.
Managed objects are in one of the following states with respect to the data manager:
- Transient - A managed object that has been created directly by the application and has not been supplied in a call to {@link #setBinding setBinding}, {@code createReference}, or {@link #getObjectId getObjectId}. Transient objects are not known to the data manager and are not stored persistently.
  Passing a transient object to {@code setBinding}, {@code createReference}, or {@code getObjectId} creates a new entry for theobject in the data manager. Calling {@code removeObject} or {@link #markForUpdate markForUpdate} on a transient object does not change thestate of the object. If a transient object implements {@link ManagedObjectRemoval}, though, then calling {@code removeObject} willcause its {@link ManagedObjectRemoval#removingObject removingObject}method to be called.
- Persistent - A managed object that has been stored in the data manager by calling {@code setBinding}, {@code createReference}, or {@code getObjectId} in the current transaction, orelse retrieved from the data manager by calling {@link #getBinding getBinding}, {@link #getBindingForUpdate getBindingForUpdate}, {@link ManagedReference#get ManagedReference.get}, or {@link ManagedReference#getForUpdate ManagedReference.getForUpdate}.
  Passing a persistent object to {@code setBinding}, {@code createReference}, {@code markForUpdate}, or {@code getObjectId} does notcreate a new entry for that object in the data manager, but rather reuses the existing one. Calling {@code removeObject} on a persistentobject removes it from the data manager, meaning it will no longer be stored persistently, and changes its state to removed. Note that a managed object made persistent in the current transaction is automatically marked for update, so there is no need to call {@code markForUpdate} for such objects, in particular in theirconstructors.
- Removed - A managed object that has been removed from the data manager by calling {@code removeObject}. Removed objects are no longer stored persistently, although the data manager makes an effort to track which managed objects have been removed.
  Only persistent managed objects can become removed; calling {@code removeObject} on a transient managed object leaves it as a transientobject. Passing a removed managed object to {@code setBinding}, {@code removeObject}, {@code markForUpdate}, {@code createReference}, or {@code getObjectId}, as well as calling {@code ManagedReference.get} or {@code ManagedReference.getForUpdate} on a reference to the removed object,will cause a {@link ObjectNotFoundException} to be thrown, if the systemhas tracked the object's removed state.
- Stale - A managed object that was persistent or removed in another, completed transaction. Stale objects are objects that have become detached from the data manager, and should not be visible to applications that avoid using static fields, but may be encountered under some circumstances. The data manager implementation may or may not track stale objects. If stale objects are not tracked, they will be considered transient.
  Passing a stale object to {@code setBinding}, {@code removeObject}, {@code markForUpdate}, {@code createReference}, or {@code getObjectId}, as well as calling {@code ManagedReference.get} or {@code ManagedReference.getForUpdate} on a reference to the stale object, willcause a {@link TransactionNotActiveException} to be thrown, if thesystem has tracked the object's stale state.
Because storing a managed object in a name binding or creating a managed reference to it causes the object to be stored in data manager, applications should insure that they remove such objects if they end up not referring to them persistently. The {@code removeObject} method does not throwexceptions when called on a transient object, so applications should call {@code removeObject} whenever there is an object that may have becomepersistent and they are sure is no longer used.
Some implementations may need to be notified when managed objects and the objects they refer to are modified, while other implementations may be configurable to detect these modifications automatically. Applications are always permitted to mark objects that have been modified, and doing so may produce performance improvements regardless of whether modifications are detected automatically. @see AppContext#getDataManager @see ManagedObject @see ManagedReference @see Serializable

    public void setSubTask(TrivialTimedTask subTask) {
        if (subTask == null) {
            subTaskRef = null;
            return;
        }
        DataManager dataManager = AppContext.getDataManager();
        subTaskRef = dataManager.createReference(subTask);
    }

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     * @param identity
     */
    UserMO(WonderlandIdentity identity) {
        this.identity = identity;


        DataManager dm = AppContext.getDataManager();
        logoutTasksRef = dm.createReference((Map<WonderlandClientID, Queue<Task>>)
                new ScalableHashMap<WonderlandClientID, Queue<Task>>());
    }

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     * 
     * @param avatarName
     * @param avatar
     */
    public void putAvatar(WonderlandClientID clientID, String avatarName, AvatarCellMO avatar) {
        DataManager dm = AppContext.getDataManager();
        Map<String, ManagedReference<AvatarCellMO>> clientAvatars = avatars.get(clientID);
        if (clientAvatars==null) {
            clientAvatars = new HashMap();


            dm.markForUpdate(this);
            avatars.put(clientID, clientAvatars);
        }
        clientAvatars.put(avatarName, dm.createReference(avatar));
    }

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     * User has logged in from specified session with specificed protocol listener
     * @param session
     * @param protocol
     */
    void login(WonderlandClientID clientID) {
        DataManager dm = AppContext.getDataManager();
        dm.markForUpdate(this);


        if (activeClients==null) {
            activeClients = new HashSet<WonderlandClientID>();
        }

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     * Add a listener to be notified when clients of this user log in or out.
     * @param listener the listener to notify on log in or log out.  Listener
     * must implement ManagedObject.
     */
    public void addUserListener(UserListener listener) {
        DataManager dm = AppContext.getDataManager();
        dm.markForUpdate(this);
        userListeners.add(dm.createReference(listener));
    }

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    /**
     * Remove a user listener from this user
     * @param listener the listener to remove
     */
    public void removeUserListener(UserListener listener) {
        DataManager dm = AppContext.getDataManager();
        dm.markForUpdate(this);
        userListeners.remove(dm.createReference(listener));
    }

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     */
    public static UserMO getUserMO(String username) {
        String userObjName = "user_"+username;
        UserMO user=null;
        
        DataManager dataMgr = AppContext.getDataManager();
        try {
            user = (UserMO) dataMgr.getBinding(userObjName);
        } catch(NameNotBoundException ex) {
            user = null;
        }
        
        return user;

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    /**
     * Log the user in from the specificed session. 
     * @param session 
     */
    public void login(WonderlandClientID clientID) {
        DataManager dm = AppContext.getDataManager();
        dm.markForUpdate(this);


        // issue 963: session could be null if client is in the process of
        // logging out
        if (clientID.getSession() == null) {
            return;
        }
        String name = clientID.getSession().getName();


        // find the user object from the database, create it if necessary
        UserMO user = getUserMO(name);
        if (user==null) {
            user = createUserMO(name);
        }
        
        // user is now logged in
        user.login(clientID);
        
        // add this session to our map
        clientToUser.put(clientID, user.getReference());


        // notify listeners for just this user
        for (ManagedReference<UserListener> listenerRef : user.getUserListeners()) {
            AppContext.getTaskManager().scheduleTask(
                    new UserListenerNotifier(listenerRef,
                                             dm.createReference(user),
                                             null,
                                             clientID,
                                             NotificationType.LOGIN));
        }


        // notify listeners for all users
        for (ManagedReference<UserListener> listenerRef : userListeners) {
            AppContext.getTaskManager().scheduleTask(
                    new UserListenerNotifier(listenerRef,
                                             dm.createReference(user),
                                             null,
                                             clientID,
                                             NotificationType.LOGIN));
        }
    }

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     * @param clientID the id of the client to end the logout process for
     * @throws IllegalArgumentException if no user is associated with the given
     * client id.
     */
    public void finishLogout(WonderlandClientID clientID) {
        DataManager dm = AppContext.getDataManager();


        // make sure there is a user
        UserMO user = getUser(clientID);
        if (user == null) {
            throw new IllegalArgumentException("Client " + clientID +
                                               " not logged in.");
        }


        // get the task queue to use
        Queue<Task> tasks = user.getLogoutTasks(clientID);
        
        // add listener notification tasks to the queue, starting with
        // per-user listeners
        for (ManagedReference<UserListener> listener : user.getUserListeners()) {
            tasks.add(new UserListenerNotifier(listener, 
                                               dm.createReference(user), 
                                               dm.createReference(tasks), 
                                               clientID, 
                                               NotificationType.LOGOUT));
        }
        
        // next add global listeners
        for (ManagedReference<UserListener> listener : userListeners) {
            tasks.add(new UserListenerNotifier(listener, 
                                               dm.createReference(user), 
                                               dm.createReference(tasks), 
                                               clientID, 
                                               NotificationType.LOGOUT));
        }


        // now that we have collected all logout tasks, start running them
        AppContext.getTaskManager().scheduleTask(
                new LogoutTask(clientID, dm.createReference(tasks)));
    }

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         *
         * @code prev the {@code Element} after this {@code Element}
         *       in the deque
         */
        void setNext(Element<E> next) {
            DataManager dm = AppContext.getDataManager();
            ManagedReference<Element<E>> ref =
                    (next == null) ? null : dm.createReference(next);


            dm.markForUpdate(this);
            nextElement = ref;
        }

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