/
datastore.lisp
210 lines (175 loc) · 8.36 KB
/
datastore.lisp
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(in-package #:tpd2.datastore)
(defvar *datastore*)
(defvar *datastore-id-max* 0)
(defun datastore-load (file)
; SBCL struggles as it tries to compile these large files if a simple load is used
(with-open-file (stream file :if-does-not-exist nil)
(when stream
(loop for form = (read stream nil 'eof)
until (eq form 'eof)
do (eval form)))))
(defun datastore-open-p ()
(and (boundp '*datastore*) *datastore*))
(defun datastore-use-file (filename)
(unless (datastore-open-p)
(datastore-load filename)
(setf *datastore* (open filename :direction :output :if-exists :append :if-does-not-exist :create #+ccl :sharing #+ccl :lock))))
(defun datastore-ref-form (object)
`(datastore-retrieve-unique ',(class-name (class-of object)) 'datastore-id ,(slot-value object 'datastore-id)))
(defun datastore-close ()
(when (datastore-open-p)
(close *datastore*)
(setf *datastore-id-max* 0))
(makunbound '*datastore*))
(defun datastore-log (list)
(when (datastore-open-p)
(with-standard-io-syntax
(format *datastore* "~S~&" list))
(force-output *datastore*)))
(defun datastore-id-next ()
*datastore-id-max*)
(defun datastore-id-register (id)
(when (>= id *datastore-id-max*)
(setf *datastore-id-max* (1+ id))))
(defstruct datastore-index
slot-name
(table (make-hash-table :test #'equal)))
(my-defun datastore-index object-value (object)
(slot-value object (my slot-name)))
(my-defun datastore-index add (object)
(push object (gethash (my object-value object) (my table))))
(my-defun datastore-index del (object)
(deletef object (gethash (my object-value object) (my table))))
(my-defun datastore-index get (value)
(gethash value (my table)))
(defgeneric datastore-delete (object))
(defgeneric datastore-retrieve-all (class &optional max-returned))
(defgeneric datastore-retrieve-indexed (class index value))
(defun datastore-retrieve-unique (class index value)
(let ((ret (datastore-retrieve-indexed class index value)))
(assert ret)
(assert (not (cdr ret)))
(car ret)))
(defgeneric datastore-save-form (object))
(defmethod datastore-save-form (object)
`',object)
(defmethod datastore-save-form ((object standard-object))
(make-load-form object))
(defmethod datastore-save-form ((object structure-object))
(make-load-form object))
(defmethod datastore-save-form ((string string))
string)
(defmethod datastore-save-form ((number number))
number)
(defmethod datastore-save-form ((array array))
(typecase array
(byte-vector
`(utf8-encode ,(force-string array)))
(t
`(make-array ',(array-dimensions array)
:element-type ',(array-element-type array)
:initial-contents (list ,@(map 'list 'datastore-save-form array))))))
(defmethod datastore-save-form ((list list))
(when list
`(list ,@(map 'list 'datastore-save-form list))))
(defgeneric datastore-record-constructor-form (object))
(defmacro defrecord (name &rest original-slot-defs)
(labels ((slot-name (slot-def)
(if (listp slot-def) (first slot-def) slot-def))
(slot-plist (slot-def)
(when (listp slot-def) (cdr slot-def)))
(slot-prop (slot-def prop)
(getf (slot-plist slot-def) prop))
(slot-transient (slot-def)
(slot-prop slot-def :transient))
(slot-persistent (slot-def)
(not (slot-transient slot-def)))
(slot-indexed (slot-def)
(slot-prop slot-def :index))
(defstruct-slot-def (slot-def)
(let ((ret (copy-list (slot-plist slot-def)))
(initform nil))
(dolist (option '(:transient :index :initform))
(remf ret option))
(list* (slot-name slot-def) initform ret)))
(guarded-slot-accessor (slot-name)
(concat-sym name '- slot-name))
(real-slot-accessor (slot-name)
(concat-sym-from-sym-package name 'unlogged- name '- slot-name))
(real-constructor ()
(concat-sym-from-sym-package name 'unlogged-make- name))
(guarded-constructor ()
(concat-sym-from-sym-package name 'make- name))
(slot-index (slot-def)
(let ((slot-name (slot-name slot-def)))
`(get ',name ',(concat-sym name '-%datastore-index- slot-name)))))
(let* ((slot-defs (list* '(datastore-id :transient t :index t :initform (datastore-id-next)) original-slot-defs))
(indexed-slots (filter #'slot-indexed slot-defs))
(defstruct-slot-defs (mapcar #'defstruct-slot-def slot-defs))
(persistent? (some #'slot-persistent slot-defs)))
(with-unique-names (constructed-object)
`(progn
(defstruct (,name
(:constructor ,(real-constructor))
(:conc-name ,(concat-sym-from-sym-package name 'unlogged- name '-)))
,@defstruct-slot-defs)
;;; Constructor
(defun ,(guarded-constructor)
(&key ,@(loop for slot-def in slot-defs
collect `(,(slot-name slot-def) ,(slot-prop slot-def :initform))))
(let ((,constructed-object (,(real-constructor))))
(datastore-id-register datastore-id)
,(when persistent?
`(datastore-log `(,',(guarded-constructor) :datastore-id ,datastore-id)))
,@(loop for slot-def in slot-defs
for slot-name = (slot-name slot-def)
collect `(setf (,(guarded-slot-accessor slot-name) ,constructed-object) ,slot-name))
,constructed-object))
,@(loop for slot-def in indexed-slots
collect `(unless ,(slot-index slot-def)
(setf ,(slot-index slot-def) (make-datastore-index :slot-name ',(slot-name slot-def)))))
;;; Guarded accessors
,@(loop for slot-def in slot-defs
for slot-name = (slot-name slot-def)
collect
`(defun ,(guarded-slot-accessor slot-name) (,name)
(,(real-slot-accessor slot-name) ,name))
collect
`(defun (setf ,(guarded-slot-accessor slot-name)) (new-value ,name)
,(when (slot-indexed slot-def)
`(datastore-index-del ,(slot-index slot-def) ,name))
(multiple-value-prog1
(setf (,(real-slot-accessor slot-name) ,name) new-value)
,(when (slot-indexed slot-def)
`(datastore-index-add ,(slot-index slot-def) ,name))
,(when (slot-persistent slot-def)
`(datastore-log
`(setf (,',(guarded-slot-accessor slot-name) ,(datastore-ref-form ,name)) ,(datastore-save-form new-value)))))))
(defmethod datastore-delete ((object ,name))
,(when persistent?
`(when (slot-value object 'datastore-id)
(datastore-log `(datastore-delete ,(datastore-ref-form object)))))
,@(loop for slot-def in indexed-slots collect
`(datastore-index-del ,(slot-index slot-def) object))
(setf (slot-value object 'datastore-id) nil))
(defmethod datastore-retrieve-all ((class (eql ',name)) &optional max-returned)
(let ((i 0))
(loop for v being the hash-values of (datastore-index-table ,(slot-index 'datastore-id))
until (and max-returned (>= i max-returned))
do (incf i (length v))
append v)))
(defmethod datastore-record-constructor-form ((object ,name))
(list ',(guarded-constructor)
,@(loop for slot-def in slot-defs
for slot-name = (slot-name slot-def)
unless (eq 'datastore-id slot-name)
collect (intern (symbol-name slot-name) :keyword)
and
collect `(datastore-save-form (,(real-slot-accessor slot-name) object)))))
,@(loop for slot-def in indexed-slots collect
`(defmethod datastore-retrieve-indexed ((class (eql ',name)) (index (eql ',(slot-name slot-def))) value)
(datastore-index-get ,(slot-index slot-def) value)))
',name)))))
(defun datastore-delete-all (class)
(assert (not (boundp '*datastore*)))
(mapc 'datastore-delete (datastore-retrieve-all class)))