com.gridsystems.storage
Class DAOManager

java.lang.Object
  com.gridsystems.storage.DAOManager

public final class DAOManager
extends java.lang.Object

Manages object load and store through a DAO instance.

Version:

1.0

Author:

Rodrigo Ruiz, Xmas (Generics)

Method Summary

static <T> void	delete(DAO<T> dao, T obj) Deletes all files associated to the specified object.
static <T> T	load(DAO<T> dao, java.util.Map<java.lang.String,java.lang.String> data) Loads an object from the specified DAO, using data as initialization info.
static <T> void	store(DAO<T> dao, T obj) Stores an object through the specified DAO.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

load

public static <T> T load(DAO<T> dao,
                         java.util.Map<java.lang.String,java.lang.String> data)
              throws java.lang.Exception

Loads an object from the specified DAO, using data as initialization info.

It first attempts to load from the regular files. If an error occurs, it will try again with the backup files.

Type Parameters:

T - Class to store/load.

Parameters:

dao - The DAO to delegate to

data - The initialization data

Returns:

The loaded object

Throws:

java.lang.Exception - In case of unrecoverable load error

store

public static <T> void store(DAO<T> dao,
                             T obj)
                  throws java.lang.Exception

Stores an object through the specified DAO.

It first stores the object in the backup file. If no error occurs, it then stores the regular ones.

Type Parameters:

T - Class to store/load.

Parameters:

dao - The DAO to delegate to

obj - The object to store

Throws:

java.lang.Exception - In case of unrecoverable error

delete

public static <T> void delete(DAO<T> dao,
                              T obj)

Deletes all files associated to the specified object.

Type Parameters:

T - Class to store/load.

Parameters:

dao - The DAO to use

obj - The object whose files to delete