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Mercurial > demo / examples/db/cl-simple-example.lisp

changeset 35: f54f7cc7458b
child: 0f678bfd8699
author: ellis <ellis@rwest.io>
date: Tue, 19 Dec 2023 16:46:55 -0500
permissions: -rw-r--r--
description: cl-simple-example implemented, init db/tao.lisp 
     1 ;;; cl-simple-example.lisp --- Common Lisp port of rocksdb/example/c_simple_example.c
     2 
     3 ;; ref: https://github.com/facebook/rocksdb/blob/main/examples/c_simple_example.c
     4 
     5 ;;; Usage: 
     6 
     7 ;; To compile and run from the shell:
     8 #|
     9 sbcl --eval '(ql:quickload :rdb)' \
    10      --eval '(ql:quickload :cli)' \
    11      --eval '(compile-file "cl-simple-example.lisp")' \
    12      --eval '(load "cl-simple-example.fasl")' \
    13      --eval "(sb-ext:save-lisp-and-die \"cl-simple-example\" :toplevel #'cl-simple-example::main :executable t)"
    14 
    15 time ./cl-simple-example
    16 |#
    17 
    18 ;; Compare to C:
    19 #|
    20 # in rocksdb/examples
    21 gcc -lrocksdb c_simple_example.c -oc_simple_example
    22 
    23 time ./c_simple_example
    24 |#
    25 
    26 ;;; Code:
    27 (defpackage :examples/rdb/cl-simple-example
    28   (:nicknames :cl-simple-example)
    29   (:use :cl :std :cli :rdb :sb-alien :rocksdb)
    30   (:export :main))
    31 
    32 (rocksdb:load-rocksdb :save t)
    33 
    34 (in-package :cl-simple-example)
    35 
    36 (in-readtable :std)
    37 
    38 (defvar *num-cpus* (alien-funcall (extern-alien "sysconf" (function long integer)) sb-unix:sc-nprocessors-onln)
    39   "CPU count.")
    40 
    41 (defparameter *db-path* "/tmp/rocksdb-cl-simple-example")
    42 
    43 (defparameter *db-backup-path* "/tmp/rocksdb-cl-simple-example-backup")
    44 
    45 (defmain ()
    46   ;; open Backup Engine that we will use for backing up our database
    47   (let ((options 
    48           (make-rocksdb-options 
    49                   (lambda (opt)
    50                     (rocksdb-options-increase-parallelism opt *num-cpus*) ;; set # of online cores
    51                     (rocksdb-options-optimize-level-style-compaction opt 0)
    52                     (rocksdb-options-set-create-if-missing opt 1)))))
    53   (with-open-backup-engine-raw (be *db-backup-path* options)
    54     ;; open DB
    55     (with-open-db-raw (db *db-path* options)
    56       ;; put key-value
    57       (put-kv-str-raw db "key" "value")
    58       ;; get value
    59       (string= (get-kv-str-raw db "key") "value")
    60       ;; create new backup in a directory specified by *db-backup-path*
    61       (create-new-backup-raw be db))
    62     ;; if something is wrong, you might want to restore data from last backup
    63     (restore-from-latest-backup-raw be *db-path* *db-backup-path*))))