Subversion Repositories SmartDukaan

package in.shop2020.storage.bdb;

import in.shop2020.metamodel.core.Entity;

import java.io.File;

import com.sleepycat.bind.serial.ClassCatalog;

import com.sleepycat.bind.serial.SerialSerialKeyCreator;

import com.sleepycat.bind.serial.StoredClassCatalog;

import com.sleepycat.je.Database;

import com.sleepycat.je.DatabaseConfig;

import com.sleepycat.je.DatabaseException;

import com.sleepycat.je.Environment;

import com.sleepycat.je.EnvironmentConfig;

import com.sleepycat.je.SecondaryConfig;

import com.sleepycat.je.SecondaryDatabase;

/**

 * database for storing various objects of Content Management System

 * @author rajveer

 *

 */

public class ContentDatabase {

    private static final String CLASS_CATALOG = "java_class_catalog";

    private static final String ENTITY_STORE = "entity_store";

    private static final String DATA_OBJECT_STORE = "data_object_store";

    private static final String ENTITY_METADATA_STORE = "entity_metadata_store";

    private static final String ENTITY_CATEGORY_INDEX = "entity_category_index";

    private static final String DEFINITION_STORE = "definition_store";

    private Environment env;

    private Database entityDb;

    private Database entityMetadataDb;

    private Database dataObjectDb;

    private Database definitionDb;

    private SecondaryDatabase entityByCategoryDb;

    private StoredClassCatalog javaCatalog;

    /**

     * Open all storage containers, indices, and catalogs.

     */

    public ContentDatabase(String homeDirectory)

        throws DatabaseException {

        // Open the Berkeley DB environment in transactional mode.

        //

        System.out.println("Opening environment in: " + homeDirectory);

        EnvironmentConfig envConfig = new EnvironmentConfig();

        envConfig.setTransactional(true);

        envConfig.setAllowCreate(true);

        env = new Environment(new File(homeDirectory), envConfig);

        // Set the Berkeley DB config for opening all stores.

        //

        DatabaseConfig dbConfig = new DatabaseConfig();

        dbConfig.setTransactional(true);

        dbConfig.setAllowCreate(true);

        // Create the Serial class catalog.  This holds the serialized class

        // format for all database records of serial format.

        //

        Database catalogDb = env.openDatabase(null, CLASS_CATALOG, dbConfig);

        javaCatalog = new StoredClassCatalog(catalogDb);

        // Open the Berkeley DB database for the Entity and Slide

        // stores.  The stores are opened with no duplicate keys allowed.

        //

        entityDb = env.openDatabase(null, ENTITY_STORE, dbConfig);

        entityMetadataDb = env.openDatabase(null, ENTITY_METADATA_STORE, dbConfig);

        dataObjectDb = env.openDatabase(null, DATA_OBJECT_STORE, dbConfig);

        definitionDb = env.openDatabase(null, DEFINITION_STORE, dbConfig);

        SecondaryConfig secConfig = new SecondaryConfig();

        secConfig.setTransactional(true);

        secConfig.setAllowCreate(true);

        secConfig.setSortedDuplicates(true);

        secConfig.setKeyCreator(new EntityByCategory(javaCatalog, Long.class, Entity.class, Long.class));

        entityByCategoryDb = env.openSecondaryDatabase(null, ENTITY_CATEGORY_INDEX, entityDb, secConfig);

    }

    /**

     * Private class for making Category ad an index to entity database, which extends SerialSerialKeyCreator.

     * Will create the secondary key once some new entity is added. 

     * @author rajveer

     *

     */

    private static class EntityByCategory extends SerialSerialKeyCreator<Object, Object, Object>{

    	public EntityByCategory(ClassCatalog classCatalog, Class primaryKeyClass, Class dataClass, Class indexKeyClass) {

			super(classCatalog, primaryKeyClass, dataClass, indexKeyClass);

		}

		@Override

		public Object createSecondaryKey(Object primaryKeyInput, Object valueInput) {

            Entity entity = (Entity) valueInput;

            return entity.getCategoryID();

		}

    }

    /**

     * Return the storage environment for the database.

     */

    public final Environment getEnvironment() {

        return env;

    }

    /**

     * Return the class catalog.

     */

    public final StoredClassCatalog getClassCatalog() {

        return javaCatalog;

    }

    /**

     * Return the definition storage container.

     */

    public final Database getDefinitionDatabase() {

        return definitionDb;

    }

    /**

     * @return Return the entity storage container.

     */

    public final Database getEntityDatabase() {

        return entityDb;

    }

    /**

     * 

     * @return

     */

    public final SecondaryDatabase getCategoryByCategoryDatabase() {

        return entityByCategoryDb;

    }

    /**

     * @return Return the entity metadata storage container.

     */

    public final Database getEntityMetadataDatabase() {

        return entityMetadataDb;

    }

    /**

     * @return Return the objects storage container.

     */

    public final Database getDataObjectDatabase() {

        return dataObjectDb;

    }

    /**

     * Close all databases and the environment.

     */

    public void close()

        throws DatabaseException {

    	entityByCategoryDb.close();

        entityDb.close();

        entityMetadataDb.close();

        dataObjectDb.close();

        definitionDb.close();

        // And don't forget to close the catalog and the environment.

        javaCatalog.close();

        env.close();

    }

}