+++ /dev/null
-;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
-;;;; *************************************************************************
-;;;; FILE IDENTIFICATION
-;;;;
-;;;; Name: pool.lisp
-;;;; Purpose: Support function for connection pool
-;;;; Programmers: Kevin M. Rosenberg, Marc Battyani
-;;;; Date Started: Apr 2002
-;;;;
-;;;; $Id$
-;;;;
-;;;; This file, part of CLSQL, is Copyright (c) 2002-2003 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.
-;;;; *************************************************************************
-
-(in-package clsql-sys)
-
-(defun make-process-lock (name)
- #+allegro (mp:make-process-lock :name name)
- #+scl (thread:make-lock name)
- #+lispworks (mp:make-lock :name name)
- #-(or allegro scl lispworks) (declare (ignore name))
- #-(or allegro scl lispworks) nil)
-
-(defmacro with-process-lock ((lock desc) &body body)
- #+scl `(thread:with-lock-held (,lock ,desc) ,@body)
- #+(or allegro lispworks)
- (declare (ignore desc))
- #+(or allegro lispworks)
- (let ((l (gensym)))
- `(let ((,l ,lock))
- #+allegro (mp:with-process-lock (,l) ,@body)
- #+lispworks (mp:with-lock (,l) ,@body)))
- #-(or scl allegro lispworks) (declare (ignore lock desc))
- #-(or scl allegro lispworks) `(progn ,@body))
-
-(defvar *db-pool* (make-hash-table :test #'equal))
-(defvar *db-pool-lock* (make-process-lock "DB Pool lock"))
-
-(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))
- (lock :accessor conn-pool-lock
- :initform (make-process-lock "Connection pool"))))
-
-(defun acquire-from-conn-pool (pool)
- (or (with-process-lock ((conn-pool-lock pool) "Acquire from pool")
- (and (plusp (length (free-connections pool)))
- (vector-pop (free-connections pool))))
- (let ((conn (connect (connection-spec pool)
- :database-type (database-type pool)
- :if-exists :new)))
- (with-process-lock ((conn-pool-lock pool) "Acquire from pool")
- (vector-push-extend conn (all-connections pool))
- (setf (conn-pool conn) pool))
- conn)))
-
-(defun release-to-conn-pool (conn)
- (let ((pool (conn-pool conn)))
- (with-process-lock ((conn-pool-lock pool) "Release to pool")
- (vector-push-extend conn (free-connections pool)))))
-
-(defun clear-conn-pool (pool)
- (with-process-lock ((conn-pool-lock pool) "Clear 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))
- nil)
-
-(defun find-or-create-connection-pool (connection-spec database-type)
- "Find connection pool in hash table, creates a new connection pool if not found"
- (with-process-lock (*db-pool-lock* "Find-or-create connection")
- (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"
- (with-process-lock (*db-pool-lock* "Disconnect pooled")
- (maphash
- #'(lambda (key conn-pool)
- (declare (ignore key))
- (clear-conn-pool conn-pool))
- *db-pool*)
- (when clear (clrhash *db-pool*)))
- t)