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<?php |
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namespace BenTools\SimpleDBAL\Model; |
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use BenTools\SimpleDBAL\Contract\ConnectionInterface; |
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use BenTools\SimpleDBAL\Contract\ResultInterface; |
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use BenTools\SimpleDBAL\Contract\StatementInterface; |
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class SimpleDBALPool |
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{ |
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const READ_WRITE = 1; |
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const READ_ONLY = 2; |
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const WRITE_ONLY = 3; |
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protected $rConnections = []; |
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protected $wConnections = []; |
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/** |
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* @param ConnectionInterface $connection |
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* @param int $access |
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* @param int $weight |
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*/ |
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public function attach(ConnectionInterface $connection, int $access = self::READ_WRITE, int $weight = 1) |
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{ |
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if ($weight >= 1) { |
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switch ($access) { |
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case self::READ_ONLY: |
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$this->rConnections[] = ['c' => $connection, 'w' => $weight]; |
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break; |
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case self::WRITE_ONLY: |
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$this->wConnections[] = ['c' => $connection, 'w' => $weight]; |
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break; |
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case self::READ_WRITE: |
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$this->rConnections[] = ['c' => $connection, 'w' => $weight]; |
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$this->wConnections[] = ['c' => $connection, 'w' => $weight]; |
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break; |
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default: |
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throw new \InvalidArgumentException("Invalid access argument."); |
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} |
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} |
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} |
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/** |
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* @param ConnectionInterface $connection |
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*/ |
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public function detach(ConnectionInterface $connection) |
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{ |
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$reorderReadConnections = false; |
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$reorderWriteConnections = false; |
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foreach ($this->rConnections as $c => $connectionBag) { |
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if ($connectionBag['c'] === $connection) { |
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unset($this->rConnections[$c]); |
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$reorderReadConnections = true; |
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} |
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} |
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foreach ($this->wConnections as $c => $connectionBag) { |
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if ($connectionBag['c'] === $connection) { |
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unset($this->wConnections[$c]); |
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$reorderWriteConnections = true; |
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} |
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} |
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if ($reorderReadConnections) { |
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$this->rConnections = array_values($this->rConnections); |
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} |
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if ($reorderWriteConnections) { |
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$this->wConnections = array_values($this->wConnections); |
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} |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function prepareReadStmt(string $query, array $values = null): StatementInterface |
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{ |
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return $this->selectReadConnection()->prepare($query, $values); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function prepareWriteStmt(string $query, array $values = null): StatementInterface |
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{ |
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return $this->selectWriteConnection()->prepare($query, $values); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function read($stmt, array $values = null): ResultInterface |
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{ |
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if ($stmt instanceof StatementInterface) { |
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return $stmt->getConnection()->execute($stmt); |
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} else { |
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return $this->selectReadConnection()->execute($stmt, $values); |
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} |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function write($stmt, array $values = null): ResultInterface |
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{ |
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if ($stmt instanceof StatementInterface) { |
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return $stmt->getConnection()->execute($stmt); |
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} else { |
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return $this->selectWriteConnection()->execute($stmt, $values); |
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} |
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} |
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/** |
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* @return ConnectionInterface |
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*/ |
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private function selectReadConnection(): ConnectionInterface |
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{ |
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$nbConnections = count($this->rConnections); |
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switch ($nbConnections) { |
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case 0: |
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throw new \RuntimeException("No connection available to read database."); |
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case 1: |
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return $this->rConnections[0]; |
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default: |
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$fill = []; |
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foreach ($this->rConnections as $c => $connection) { |
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$fill = array_merge($fill, array_fill(0, $connection['w'], $c)); |
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} |
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$cnt = count($fill); |
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return $this->rConnections[$fill[random_int(0, $cnt)]]; |
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} |
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} |
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/** |
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* @return ConnectionInterface |
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*/ |
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private function selectWriteConnection(): ConnectionInterface |
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{ |
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$nbConnections = count($this->wConnections); |
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switch ($nbConnections) { |
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case 0: |
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throw new \RuntimeException("No connection available to write on database."); |
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case 1: |
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return $this->wConnections[0]; |
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default: |
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$fill = []; |
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foreach ($this->wConnections as $c => $connection) { |
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$fill = array_merge($fill, array_fill(0, $connection['w'], $c)); |
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} |
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$cnt = count($fill); |
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return $this->wConnections[$fill[random_int(0, $cnt)]]; |
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} |
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} |
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} |
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bpolaszek /
simple-dbal
