server
Interface DAO<K,V>

Type Parameters:

K - The type of the key of the elements stored in the database.

V - The values stored in the database.

All Known Implementing Classes:

ConnectionHandlerThread, DaoImpl

public interface DAO<K,V>

The Data Object Interface (DAO) works as a layer between the application logic and the database.

Author:

Fernando

Field Summary

static int	ADD Constant for the operation of adding a new element in the database.
static int	DELETE Constant for the operation of deleting a new operation from the database.
static int	GET The constant that denotes the operation of getting an element from the database.
static java.lang.String	HOST The address of the host that we must use, whenever we are testing the client and server applications on the same machine.
static int	PORT The port in which the server will be waiting for connections.
static int	SIZE Constant for the operation of asking for the size of the database.
static int	UPDATE Constant for the operation of putting a new element in the database.

Method Summary

void	add(K key, V value) Adds a new object into the database.
void	delete(K key) Removes an object from the database.
V	get(K key) Returns a value, given a key.
int	size() Informs the number of elements stored in the database.
void	update(K key, V value) Updates an object in the database.

Field Detail

GET

static final int GET

The constant that denotes the operation of getting an element from the database.

See Also:

Constant Field Values

ADD

static final int ADD

Constant for the operation of adding a new element in the database.

See Also:

Constant Field Values

DELETE

static final int DELETE

Constant for the operation of deleting a new operation from the database.

See Also:

Constant Field Values

UPDATE

static final int UPDATE

Constant for the operation of putting a new element in the database.

See Also:

Constant Field Values

SIZE

static final int SIZE

Constant for the operation of asking for the size of the database.

See Also:

Constant Field Values

PORT

static final int PORT

The port in which the server will be waiting for connections.

See Also:

Constant Field Values

HOST

static final java.lang.String HOST

The address of the host that we must use, whenever we are testing the client and server applications on the same machine.

See Also:

Constant Field Values

Method Detail

get

V get(K key)

Returns a value, given a key.

Parameters:

key - the id of the object that must be found.

Returns:

V the value associated with the key K.

add

void add(K key,
         V value)

Adds a new object into the database.

Parameters:

key - the id of the object that will be inserted into the database.

value - the value associated with the key K.

delete

void delete(K key)

Removes an object from the database.

Parameters:

key - the id of the object that will be removed.

update

void update(K key,
            V value)

Updates an object in the database.

Parameters:

key - the id of the object that will be replaced.

value - the new value of the object associated with the given key.

size

int size()

Informs the number of elements stored in the database.

Returns:

an integer number that tells how many objects are currently stored in the database.