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var
path
=
require
(
'path'
)
;
var
fs
=
require
(
'graceful-fs'
)
;
var
del
=
require
(
'del'
)
.
sync
;
var
utils
=
require
(
'./utils'
)
;
var
writeJSON
=
utils
.
writeJSON
;
var
cache
=
{
/**
* Load a cache identified by the given Id. If the element does not exists, then initialize an empty
* cache storage. If specified `cacheDir` will be used as the directory to persist the data to. If omitted
* then the cache module directory `./cache` will be used instead
*
*
@method
load
*
@param
docId {String} the id of the cache, would also be used as the name of the file cache
*
@param
[cacheDir] {String} directory for the cache entry
*/
load
:
function
(
docId
,
cacheDir
)
{
var
me
=
this
;
me
.
_visited
=
{
}
;
me
.
_persisted
=
{
}
;
me
.
_pathToFile
=
cacheDir
?
path
.
resolve
(
cacheDir
,
docId
)
:
path
.
resolve
(
__dirname
,
'./.cache/'
,
docId
)
;
if
(
fs
.
existsSync
(
me
.
_pathToFile
)
)
{
me
.
_persisted
=
utils
.
tryParse
(
me
.
_pathToFile
,
{
}
)
;
}
}
,
/**
* Load the cache from the provided file
*
@method
loadFile
*
@param
{
String
} pathToFile the path to the file containing the info for the cache
*/
loadFile
:
function
(
pathToFile
)
{
var
me
=
this
;
var
dir
=
path
.
dirname
(
pathToFile
)
;
var
fName
=
path
.
basename
(
pathToFile
)
;
me
.
load
(
fName
,
dir
)
;
}
,
keys
:
function
(
)
{
return
Object
.
keys
(
this
.
_persisted
)
;
}
,
/**
* sets a key to a given value
*
@method
setKey
*
@param
key {string} the key to set
*
@param
value {object} the value of the key. Could be any object that can be serialized with JSON.stringify
*/
setKey
:
function
(
key
,
value
)
{
this
.
_visited
[
key
]
=
true
;
this
.
_persisted
[
key
]
=
value
;
}
,
/**
* remove a given key from the cache
*
@method
removeKey
*
@param
key {String} the key to remove from the object
*/
removeKey
:
function
(
key
)
{
delete
this
.
_visited
[
key
]
;
// esfmt-ignore-line
delete
this
.
_persisted
[
key
]
;
// esfmt-ignore-line
}
,
/**
* Return the value of the provided key
*
@method
getKey
*
@param
key {String} the name of the key to retrieve
*
@returns
{
*
} the value from the key
*/
getKey
:
function
(
key
)
{
this
.
_visited
[
key
]
=
true
;
return
this
.
_persisted
[
key
]
;
}
,
/**
* Remove keys that were not accessed/set since the
* last time the `prune` method was called.
*
@method
_prune
*
@private
*/
_prune
:
function
(
)
{
var
me
=
this
;
var
obj
=
{
}
;
var
keys
=
Object
.
keys
(
me
.
_visited
)
;
// no keys visited for either get or set value
if
(
keys
.
length
===
0
)
{
return
;
}
keys
.
forEach
(
function
(
key
)
{
obj
[
key
]
=
me
.
_persisted
[
key
]
;
}
)
;
me
.
_visited
=
{
}
;
me
.
_persisted
=
obj
;
}
,
/**
* Save the state of the cache identified by the docId to disk
* as a JSON structure
*
@param
[noPrune=false] {Boolean} whether to remove from cache the non visited files
*
@method
save
*/
save
:
function
(
noPrune
)
{
var
me
=
this
;
(
!
noPrune
)
&&
me
.
_prune
(
)
;
writeJSON
(
me
.
_pathToFile
,
me
.
_persisted
)
;
}
,
/**
* remove the file where the cache is persisted
*
@method
removeCacheFile
*
@return
{
Boolean
} true or false if the file was successfully deleted
*/
removeCacheFile
:
function
(
)
{
return
del
(
this
.
_pathToFile
,
{
force
:
true
}
)
;
}
,
/**
* Destroy the file cache and cache content.
*
@method
destroy
*/
destroy
:
function
(
)
{
var
me
=
this
;
me
.
_visited
=
{
}
;
me
.
_persisted
=
{
}
;
me
.
removeCacheFile
(
)
;
}
}
;
module
.
exports
=
{
/**
* Alias for create. Should be considered depreacted. Will be removed in next releases
*
*
@method
load
*
@param
docId {String} the id of the cache, would also be used as the name of the file cache
*
@param
[cacheDir] {String} directory for the cache entry
*
@returns
{
cache
} cache instance
*/
load
:
function
(
docId
,
cacheDir
)
{
return
this
.
create
(
docId
,
cacheDir
)
;
}
,
/**
* Load a cache identified by the given Id. If the element does not exists, then initialize an empty
* cache storage.
*
*
@method
create
*
@param
docId {String} the id of the cache, would also be used as the name of the file cache
*
@param
[cacheDir] {String} directory for the cache entry
*
@returns
{
cache
} cache instance
*/
create
:
function
(
docId
,
cacheDir
)
{
var
obj
=
Object
.
create
(
cache
)
;
obj
.
load
(
docId
,
cacheDir
)
;
return
obj
;
}
,
createFromFile
:
function
(
filePath
)
{
var
obj
=
Object
.
create
(
cache
)
;
obj
.
loadFile
(
filePath
)
;
return
obj
;
}
,
/**
* Clear the cache identified by the given id. Caches stored in a different cache directory can be deleted directly
*
*
@method
clearCache
*
@param
docId {String} the id of the cache, would also be used as the name of the file cache
*
@param
cacheDir {String} the directory where the cache file was written
*
@returns
{
Boolean
} true if the cache folder was deleted. False otherwise
*/
clearCacheById
:
function
(
docId
,
cacheDir
)
{
var
filePath
=
cacheDir
?
path
.
resolve
(
cacheDir
,
docId
)
:
path
.
resolve
(
__dirname
,
'./.cache/'
,
docId
)
;
return
del
(
filePath
,
{
force
:
true
}
)
.
length
>
0
;
}
,
/**
* Remove all cache stored in the cache directory
*
@method
clearAll
*
@returns
{
Boolean
} true if the cache folder was deleted. False otherwise
*/
clearAll
:
function
(
cacheDir
)
{
var
filePath
=
cacheDir
?
path
.
resolve
(
cacheDir
)
:
path
.
resolve
(
__dirname
,
'./.cache/'
)
;
return
del
(
filePath
,
{
force
:
true
}
)
.
length
>
0
;
}
}
;
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