-;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
-;;;; *************************************************************************
-;;;; FILE IDENTIFICATION
-;;;;
-;;;; Name: pool.cl
-;;;; Purpose: Support function for connection pool
-;;;; Programmers: Kevin M. Rosenberg, Marc Battyani
-;;;; Date Started: Apr 2002
-;;;;
-;;;; $Id: pool.cl,v 1.6 2002/05/13 16:55:07 marc.battyani Exp $
-;;;;
-;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
-;;;;
-;;;; CLSQL users are granted the rights to distribute and use this software
-;;;; as governed by the terms of the Lisp Lesser GNU Public License
-;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
-;;;; *************************************************************************
-
-(declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0)))
-(in-package :clsql-sys)
-
-(defvar *db-pool* (make-hash-table :test #'equal))
-
-(defclass conn-pool ()
- ((connection-spec :accessor connection-spec :initarg :connection-spec)
- (database-type :accessor database-type :initarg :database-type)
- (free-connections :accessor free-connections
- :initform (make-array 5 :fill-pointer 0 :adjustable t))
- (all-connections :accessor all-connections
- :initform (make-array 5 :fill-pointer 0 :adjustable t))))
-
-(defun acquire-from-conn-pool (pool)
- (if (zerop (length (free-connections pool)))
- (let ((conn (connect (connection-spec pool)
- :database-type (database-type pool) :if-exists :new)))
- (vector-push-extend conn (all-connections pool))
- (setf (conn-pool conn) pool)
- conn)
- (vector-pop (free-connections pool))))
-
-(defun release-to-conn-pool (conn)
- (vector-push-extend conn (free-connections (conn-pool conn))))
-
-(defun clear-conn-pool (pool)
- (loop for conn across (all-connections pool)
- do (setf (conn-pool conn) nil)
- (disconnect :database conn))
- (setf (fill-pointer (free-connections pool)) 0)
- (setf (fill-pointer (all-connections pool)) 0))
-
-(defun find-or-create-connection-pool (connection-spec database-type)
- "Find connection pool in hash table, creates a new connection pool if not found"
- (let* ((key (list connection-spec database-type))
- (conn-pool (gethash key *db-pool*)))
- (unless conn-pool
- (setq conn-pool (make-instance 'conn-pool
- :connection-spec connection-spec
- :database-type database-type))
- (setf (gethash key *db-pool*) conn-pool))
- conn-pool))
-
-(defun acquire-from-pool (connection-spec database-type &optional pool)
- (unless (typep pool 'conn-pool)
- (setf pool (find-or-create-connection-pool connection-spec database-type)))
- (acquire-from-conn-pool pool))
-
-(defun release-to-pool (database)
- (release-to-conn-pool database))
-
-(defun disconnect-pooled (&optional clear)
- "Disconnects all connections in the pool"
- (maphash
- #'(lambda (key conn-pool)
- (declare (ignore key))
- (clear-conn-pool conn-pool))
- *db-pool*)
- (when clear (clrhash *db-pool*))
- t)
-