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Junming
jio
Commits
2ec16e69
Commit
2ec16e69
authored
Apr 01, 2014
by
Tristan Cavelier
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indexedDB storage prototype added
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ff58cc8b
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src/jio.storage/indexeddbstorage.js
src/jio.storage/indexeddbstorage.js
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src/jio.storage/indexeddbstorage.js
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2ec16e69
/*
* Copyright 2014, Nexedi SA
* Released under the LGPL license.
* http://www.gnu.org/licenses/lgpl.html
*/
/**
* JIO Indexed Database Storage.
*
* A local browser "database" storage greatly more powerful than localStorage.
*
* Description:
*
* {
* "type": "indexeddb",
* "database": <string>
* }
*
* The database name will be prefixed by "jio:", so if the database property is
* "hello", then you can manually reach this database with
* `indexedDB.open("jio:hello");`. (Or
* `indexedDB.deleteDatabase("jio:hello");`.)
*
* For more informations:
*
* - http://www.w3.org/TR/IndexedDB/
*/
/*jslint indent: 2, maxlen: 80 */
/*global define, module, indexedDB, jIO, RSVP */
(
function
(
dependencies
,
factory
)
{
"
use strict
"
;
if
(
typeof
define
===
"
function
"
&&
define
.
amd
)
{
return
define
(
dependencies
,
factory
);
}
if
(
typeof
module
===
"
object
"
&&
module
!==
null
&&
typeof
module
.
exports
===
"
object
"
&&
module
.
exports
!==
null
&&
typeof
require
===
"
function
"
)
{
module
.
exports
=
factory
.
apply
(
null
,
dependencies
.
map
(
require
));
return
;
}
factory
(
jIO
,
RSVP
);
}([
"
jio
"
,
"
rsvp
"
],
function
(
jIO
,
RSVP
)
{
"
use strict
"
;
var
Promise
=
RSVP
.
Promise
;
// XXX doc string
function
metadataObjectToString
(
value
)
{
var
i
,
l
;
if
(
Array
.
isArray
(
value
))
{
for
(
i
=
0
,
l
=
value
.
length
;
i
<
l
;
i
+=
1
)
{
value
[
i
]
=
metadataObjectToString
(
value
[
i
]);
}
return
value
;
}
if
(
typeof
value
===
"
object
"
&&
value
!==
null
)
{
return
value
.
content
;
}
return
value
;
}
/**
* new IndexedDBStorage(description)
*
* Creates a storage object designed for jIO to store documents into
* indexedDB.
*
* @class IndexedDBStorage
* @constructor
*/
function
IndexedDBStorage
(
description
)
{
if
(
typeof
description
.
database
!==
"
string
"
||
description
.
database
===
""
)
{
throw
new
TypeError
(
"
IndexedDBStorage 'database' description property
"
+
"
must be a non-empty string
"
);
}
this
.
_database_name
=
"
jio:
"
+
description
.
database
;
}
// XXX doc string
IndexedDBStorage
.
prototype
.
createDBIfNecessary
=
function
()
{
var
status
,
request
=
indexedDB
.
open
(
this
.
_database_name
);
// No request.abort() is provided so we cannot cancel database creation
return
new
Promise
(
function
(
resolve
,
reject
)
{
request
.
onupgradeneeded
=
function
()
{
// If we reach this point, the database is created.
// There is no way to cancel the operation from here.
// So let's continue.
var
db
=
request
.
result
;
db
.
createObjectStore
(
"
metadata
"
,
{
"
keyPath
"
:
"
_id
"
});
status
=
"
created
"
;
};
request
.
onerror
=
function
()
{
var
db
=
request
.
result
;
if
(
db
)
{
db
.
close
();
}
reject
(
request
.
error
);
};
request
.
onsuccess
=
function
()
{
request
.
result
.
close
();
resolve
(
status
||
"
no_content
"
);
};
});
};
// XXX doc string
IndexedDBStorage
.
prototype
.
getMetadata
=
function
(
id
)
{
var
onCancel
,
request
=
indexedDB
.
open
(
this
.
_database_name
);
return
new
Promise
(
function
(
resolve
,
reject
)
{
request
.
onerror
=
function
()
{
var
db
=
request
.
result
;
reject
(
request
.
error
);
if
(
db
)
{
db
.
close
();
}
};
request
.
onsuccess
=
function
()
{
try
{
var
db
,
tx
,
store
,
getrequest
;
db
=
request
.
result
;
tx
=
db
.
transaction
(
"
metadata
"
,
"
readonly
"
);
store
=
tx
.
objectStore
(
"
metadata
"
);
// we can cancel the transaction from here
onCancel
=
function
()
{
tx
.
abort
();
db
.
close
();
};
getrequest
=
store
.
get
(
id
);
getrequest
.
onabort
=
function
()
{
// if cancelled, the getrequest should fail
reject
(
getrequest
.
error
);
db
.
close
();
};
getrequest
.
onerror
=
getrequest
.
onabort
;
getrequest
.
onsuccess
=
function
()
{
// if cancelled, this function should not be called
if
(
!
getrequest
.
result
)
{
reject
(
"
not_found
"
);
return
;
}
resolve
(
getrequest
.
result
);
db
.
close
();
};
}
catch
(
e
)
{
reject
(
e
);
}
};
},
function
()
{
if
(
typeof
onCancel
===
"
function
"
)
{
onCancel
();
}
});
};
// XXX doc string
IndexedDBStorage
.
prototype
.
putMetadata
=
function
(
metadata
)
{
var
onCancel
,
request
=
indexedDB
.
open
(
this
.
_database_name
);
return
new
Promise
(
function
(
resolve
,
reject
)
{
request
.
onerror
=
function
()
{
var
db
=
request
.
result
;
reject
(
request
.
error
);
if
(
db
)
{
db
.
close
();
}
};
request
.
onsuccess
=
function
()
{
try
{
var
db
,
tx
,
store
;
db
=
request
.
result
;
tx
=
db
.
transaction
(
"
metadata
"
,
"
readwrite
"
);
store
=
tx
.
objectStore
(
"
metadata
"
);
// we can cancel the transaction from here
onCancel
=
function
()
{
tx
.
abort
();
db
.
close
();
};
store
.
put
(
metadata
);
tx
.
oncomplete
=
function
()
{
resolve
();
db
.
close
();
};
}
catch
(
e
)
{
reject
(
e
);
}
};
},
function
()
{
if
(
typeof
onCancel
===
"
function
"
)
{
onCancel
();
}
});
};
// XXX doc string
IndexedDBStorage
.
prototype
.
get
=
function
(
command
,
param
)
{
this
.
createDBIfNecessary
().
then
(
this
.
getMetadata
.
bind
(
this
,
param
.
_id
)).
then
(
function
(
data
)
{
command
.
success
({
"
data
"
:
data
});
},
command
.
error
,
command
.
notify
);
};
// XXX doc string
IndexedDBStorage
.
prototype
.
put
=
function
(
command
,
metadata
)
{
var
status
;
this
.
createDBIfNecessary
().
then
(
this
.
getMetadata
.
bind
(
this
,
metadata
.
_id
)).
then
(
null
,
function
(
error
)
{
if
(
error
===
"
not_found
"
)
{
status
=
"
created
"
;
return
{};
}
throw
error
;
}).
then
(
function
(
data
)
{
var
i
,
l
,
key
,
array
;
array
=
Object
.
keys
(
metadata
);
for
(
i
=
0
,
l
=
array
.
length
;
i
<
l
;
i
+=
1
)
{
key
=
array
[
i
];
metadata
[
key
]
=
metadataObjectToString
(
metadata
[
key
]);
}
if
(
data
.
_attachments
)
{
metadata
.
_attachments
=
data
.
_attachments
;
}
}).
then
(
this
.
putMetadata
.
bind
(
this
,
metadata
)).
then
(
function
()
{
command
.
success
(
status
||
"
no_content
"
);
},
command
.
error
,
command
.
notify
);
};
jIO
.
addStorage
(
"
indexeddb
"
,
IndexedDBStorage
);
}));
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