//     $Revision: 1.1.2.3 $
package com.kabira.snippets.store;

import com.kabira.platform.LockMode;
import com.kabira.platform.ManagedObject;
import com.kabira.platform.Transaction;
import com.kabira.platform.annotation.Managed;
import com.kabira.store.Extent;

/**
 * Secondary store extent notifier
 * <p>
 * <h2> Target Nodes</h2>
 * <ul>
 * <li> <b>domainnode</b> = A
 * </ul>
 */
public class ExtentNotifier
{
    @Managed
    private static class Parent { };
    private static class Child extends Parent { };
    
    private static class Notifier extends Extent<Parent>
    {
        public Notifier()
        {
            super(Parent.class);
        }
        
        @Override
        public void extent(Class<? extends Parent> type, LockMode lockMode)
        {
            //
            //  Extent query on parent
            //
            if (type.equals(Parent.class) == true)
            {
                System.out.println("INFO: Extent called on parent");

                //
                //  Create some parent objects to return to application
                //
                new Parent();
                new Parent();
            }
            //
            //  Extent query on child
            //
            else
            {
                assert type.equals(Child.class) : type;
                
                System.out.println("INFO: Extent called on child");
                
                //
                //  Create some child objects to return to application
                //
                new Child();
                new Child();
            } 
        }
    }
	
    /**
     * Main entry point
     * @param args  Not used
     */
    public static void main(final String [ ] args)
    {
        //
        //  Install extent notifier for Parent type
        //
        new Transaction("Install")
        {
            @Override
            protected void run() throws Transaction.Rollback
            {
                new Notifier();
            }
        }.execute();
        
        new Transaction("Extent Query")
        {
            @Override
            protected void run() throws Transaction.Rollback
            {
                //
                //  Perform extent query on child
                //
                for (Child c : ManagedObject.extent(Child.class))
                {
                    System.out.println("INFO:\t" + c);
                }
                
                //
                //  Perform extent query on parent
                //
                for (Parent p : ManagedObject.extent(Parent.class))
                {
                    System.out.println("INFO:\t" + p);
                }        
            }
        }.execute();
    }
}