AbstractDBD.java

package lastkilometer.BerkeleyDB;


import java.io.File;
import java.io.FileNotFoundException;

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;

/**
 * 抽象类，打开和关闭数据库
 * 
 * */
public abstract class AbstractDBD {
	private Environment env;
	private static final String CLASS_CATALOG = "java_class_catalog";
	protected StoredClassCatalog javaCatalog;
	protected Database catalogdatabase;
	protected Database database;

	public AbstractDBD(String homeDirectory) throws DatabaseException,FileNotFoundException {
		//判断文件夹是否存在，不存在则创建
		File file =new File(homeDirectory);    
		//如果文件夹不存在则创建    
		if  (!file .exists()  && !file .isDirectory()){       
		    file .mkdir();    
		} 
		
		// 打开env
		System.out.println("Opening environment in: " + homeDirectory);
		EnvironmentConfig envConfig = new EnvironmentConfig();
		envConfig.setTransactional(true);
		envConfig.setAllowCreate(true);
		env = new Environment(new File(homeDirectory), envConfig);
		// 设置DatabaseConfig
		DatabaseConfig dbConfig = new DatabaseConfig();
		dbConfig.setTransactional(true);
		dbConfig.setAllowCreate(true);
		// 打开
		catalogdatabase = env.openDatabase(null, CLASS_CATALOG, dbConfig);
		javaCatalog = new StoredClassCatalog(catalogdatabase);
		// 设置DatabaseConfig
		DatabaseConfig dbConfig0 = new DatabaseConfig();
		dbConfig0.setTransactional(true);
		dbConfig0.setAllowCreate(true);
		// 打开
		database = env.openDatabase(null, "URL", dbConfig);
	}

	// 关闭数据库，关闭环境
	public void close() throws DatabaseException {
		database.close();
		javaCatalog.close();
		env.close();
	}

	// put方法
	protected abstract void put(Object key, Object value);

	// get方法
	protected abstract Object get(Object key);

	// delete方法
	protected abstract Object delete(Object key);
}