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-;;; cache-table.el --- a hash table with expiring entries -*- lexical-binding: t; -*-
-
-;; This is free and unencumbered software released into the public domain.
-
-;; Author: Christopher Wellons <mosquitopsu@gmail.com>
-;; Version: 1.0
-
-;;; Commentary:
-
-;; See the docstring of `cache-table-create'. There is no
-;; `cache-table-put': use `setf' on `cache-table-get' instead.
-
-;;; Code:
-
-(require 'cl-lib)
-
-(cl-defstruct (cache-table (:constructor cache-table--create))
- "A cache table with expiring entries."
- expire-time table)
-
-(defun cache-table-create (expire-time &rest keyword-args)
- "Create a new cache-table with entries automatically removed
-from the table after EXPIRE-TIME seconds. This function accepts
-the same keyword arguments as `make-hash-table'. Entries are not
-actually removed from the cache-table until an access is made to
-the cache-table.
-
-Use `cache-table-get' to get and put (via setf) entries."
- (cache-table--create :expire-time expire-time
- :table (apply #'make-hash-table keyword-args)))
-
-(defun cache-table-clear-expired (cache-table)
- "Remove all expired entries from CACHE-TABLE."
- (cl-loop with expire-time = (cache-table-expire-time cache-table)
- with table = (cache-table-table cache-table)
- with dead-time = (- (float-time) expire-time)
- for key being the hash-keys of table using (hash-value entry)
- for (time . value) = entry
- when (< time dead-time) do (remhash key table)))
-
-(defun cache-table-get (key cache-table &optional default)
- "Access the value for KEY in CACHE-TABLE if it has not yet
-expired. Behaves just like `gethash'."
- (cache-table-clear-expired cache-table)
- (cdr (gethash key (cache-table-table cache-table) (cons 0 default))))
-
-(gv-define-setter cache-table-get (value key cache-table)
- "Put an entry in the hash table, like (setf (gethash key table) value)."
- `(progn
- (cache-table-clear-expired ,cache-table)
- (puthash ,key (cons (float-time) ,value)
- (cache-table-table ,cache-table))))
-
-(defun cache-table-map (f cache-table)
- "Like `maphash', call F for all non-expired entries in CACHE-TABLE."
- (cache-table-clear-expired cache-table)
- (maphash (lambda (k v) (funcall f k (cdr v)))
- (cache-table-table cache-table)))
-
-(defun cache-table-count (cache-table)
- "Like `hash-table-count', count the number of non-expired entries."
- (hash-table-count (cache-table-table cache-table)))
-
-(provide 'cache-table)
-
-;;; cache-table.el ends here