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Connector.php
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Connector.php
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<?php
/**
* @package go\DB
*/
namespace go\DB\Helpers;
use go\DB\Implementations\Base as BaseImp;
use go\DB\Exceptions\ConfigConnect;
use go\DB\Exceptions\Connect;
/**
* Abstract database connection
*
* Contains a low-level connect implementation.
* Can be divided among several database objects.
*
* @author Oleg Grigoriev <go.vasac@gmail.com>
*/
final class Connector
{
/**
* The constructor
*
* @param string $adapter
* the adapter name
* @param array $params
* the connection parameters
* @throws \go\DB\Exceptions\ConfigConnect
* the connection parameters is invalid
*/
public function __construct($adapter, array $params)
{
$this->implementation = BaseImp::getImplementationForAdapter($adapter);
$this->params = $this->implementation->checkParams($params, $error);
if (!$this->params) {
throw new ConfigConnect($error);
}
$this->countLinks = 1;
$this->countConnections = 0;
}
/**
* The destructor
*/
public function __destruct()
{
$this->deny();
}
/**
* The connection requirement
*
* @return bool
* TRUE if connection has been established in this time
* @throws \go\DB\Exceptions\Connect
* a connect error
*/
public function connect()
{
if ($this->connection) {
$this->countConnections++;
return false;
}
$connection = $this->implementation->connect($this->params, $errorInfo, $errorCode);
if (!$connection) {
throw new Connect($errorInfo, $errorCode);
}
$this->connection = $connection;
$this->countConnections = 1;
return true;
}
/**
* The closing requirement
*
* @return bool
* TRUE if connection has been closed in this time
*/
public function close()
{
if (!$this->connection) {
return false;
}
$this->countConnections--;
if ($this->countConnections > 0) {
return false;
}
$this->implementation->close($this->connection);
$this->connection = null;
return true;
}
/**
* Checks if connection is established
*
* @return bool
*/
public function isConnected()
{
return (!empty($this->connection));
}
/**
* Appends a link to this connection
*
* @param bool $connection
* this database has connection already
*/
public function addLink($connection)
{
$this->countLinks++;
if ($connection) {
$this->countConnections++;
}
}
/**
* Removes alink to this connection
*/
public function removeLink()
{
if ($this->countLinks > 0) {
$this->countLinks--;
if ($this->countLinks === 0) {
$this->deny();
}
}
}
/**
* Returns number of required connections
*
* @return int
*/
public function getCountConnections()
{
return $this->countConnections;
}
/**
* Returns the low-level connection implementation
*
* @return mixed
*/
public function getConnection()
{
return $this->connection;
}
/**
* Returns the database implementation
*
* @return \go\DB\Implementations\Base
*/
public function getImplementation()
{
return $this->implementation;
}
/**
* Closes all connection
*/
protected function deny()
{
if ($this->connection) {
$this->implementation->close($this->connection);
$this->connection = null;
}
$this->countLinks = 0;
$this->countConnections = 0;
return true;
}
/**
* The database implementation
*
* @var \go\DB\Implementations\Base
*/
private $implementation;
/**
* The low-level connection implementation
*
* @var mixed
*/
private $connection;
/**
* The connection configuration
*
* @var array
*/
private $params;
/**
* Number of links from DB instances
*
* @var int
*/
private $countLinks;
/**
* Number of required connections
*
* @var int
*/
private $countConnections;
}