+++ /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)
-
-(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 pool-database-type :initarg :pool-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")
- (when (plusp (length (free-connections pool)))
- (let ((pconn (vector-pop (free-connections pool))))
- ;; test if connection still valid.
- ;; Currently, on supported on MySQL
- (cond
- ((eq :mysql (database-type pconn))
- (handler-case
- (database-query "SHOW ERRORS LIMIT 1" pconn nil nil)
- (error (e)
- ;; we could check for error type 2006 for "SERVER GONE AWAY",
- ;; but, it's safer just to disconnect the pooled conn for any error
- (warn "Database connection ~S had an error when attempted to be acquired from the pool:
- ~S
-Disconnecting.~%"
- pconn e)
- (ignore-errors (database-disconnect pconn))
- nil)
- (:no-error (res fields)
- (declare (ignore res fields))
- pconn)))
- (t
- pconn)))))
- (let ((conn (connect (connection-spec pool)
- :database-type (pool-database-type pool)
- :if-exists :new
- :make-default nil)))
- (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 may error if remote side closed connection
- (ignore-errors (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
- :pool-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)
-
-;(defun pool-start-sql-recording (pool &key (types :command))
-; "Start all stream in the pool recording actions of TYPES"
-; (dolist (con (pool-connections pool))
-; (start-sql-recording :type types
-; :database (connection-database con))))
-
-;(defun pool-stop-sql-recording (pool &key (types :command))
-; "Start all stream in the pool recording actions of TYPES"
-; (dolist (con (pool-connections pool))
-; (stop-sql-recording :type types
-; :database (connection-database con))))
-
-;(defmacro with-database-connection (pool &body body)
-; `(let ((connection (obtain-connection ,pool))
-; (results nil))
-; (unwind-protect
-; (with-database ((connection-database connection))
-; (setq results (multiple-value-list (progn ,@body))))
-; (release-connection connection))
-; (values-list results)))