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Added wrappers for requests and transactions.

This commit is contained in:
Alan Kligman 2012-10-08 01:53:12 -04:00
parent 920bf44cae
commit 129189ea77
2 changed files with 109 additions and 56 deletions
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9
examples/test.html
View File

@ -14,10 +14,13 @@ require.config({
require(["../../javascript-debug/debug", "src/filesystem"], function(debug, FileSystem) {
var fs = new FileSystem(undefined, true);
debug.log("filesystem state: ", fs.state);
// debug.log("filesystem state: ", fs.state);
fs.then(function(fs) {
debug.log("filesystem state: ", fs.state);
fs.mkdir("/tmp");
// debug.log("filesystem state: ", fs.state);
var p = fs.mkdir("/tmp");
p.then(function(e) {
fs.mkdir("/tmp");
});
});
});
</script>

156
src/filesystem.js
View File

@ -30,6 +30,10 @@ define(function(require) {
}).toUpperCase();
}
function dirname(path) {
return path.match( /.*\// );
}
function FileError(code) {
this.code = code;
// FIXME: add a message field with the text error
@ -58,6 +62,59 @@ define(function(require) {
RW = "readwrite";
function FileSystem(name, optFormat) {
function Transaction(db, scope, mode) {
var id = this.id = guid();
this._IdbTransaction = db.transaction(scope, mode);
var deferred = when.defer();
this._IdbTransaction.oncomplete = function(e) {
deferred.resolve(e);
clearPending(id);
};
this._IdbTransaction.onerror = function(e) {
deferred.reject(e);
clearPending(id);
};
this.then = deferred.promise.then;
this.objectStore = this._IdbTransaction.objectStore.bind(this._IdbTransaction);
this.abort = this._IdbTransaction.abort.bind(this._IdbTransaction);
queuePending(this, id);
}
function Request(request) {
var id = this.id = guid();
this._IdbRequest = request;
var deferred = when.defer();
this._IdbRequest.onsuccess = function(e) {
deferred.resolve(e);
clearPending(id);
};
this._IdbRequest.onerror = function(e) {
deferred.reject(e);
clearPending(id);
};
this.then = deferred.promise.then;
queuePending(this, id);
}
function OpenDBRequest(request, upgrade) {
var id = this.id = guid();
this._IdbRequest = request;
var deferred = when.defer();
this._IdbRequest.onsuccess = function(e) {
deferred.resolve(e);
clearPending(id);
};
this._IdbRequest.onerror = function(e) {
deferred.reject(e);
clearPending(id);
};
if(typeof upgrade === "function") {
this._IdbRequest.onupgradeneeded = upgrade;
}
this.then = deferred.promise.then;
queuePending(this, id);
}
var fs = this;
fs.OBJECT_STORE_NAME = "files";
fs.name = name || "default";
@ -88,22 +145,17 @@ define(function(require) {
}
}
function queuePending(request) {
var id = guid();
request.id = id;
fs.pending[id] = request;
function queuePending(transaction, id) {
fs.pending[id] = transaction;
updateState();
return request;
return transaction;
}
function clearPending(request) {
var id = request.id;
function clearPending(id) {
if(fs.pending.hasOwnProperty(id)) {
delete fs.pending[id];
}
delete request.id;
updateState();
return request;
}
var format = undefined !== optFormat ? optFormat : false;
@ -111,27 +163,8 @@ define(function(require) {
fs.then = deferred.promise.then;
updateState();
var openRequest = queuePending(indexedDB.open(name));
fs.state = FileSystem.PENDING;
openRequest.onsuccess = function(e) {
fs.db = e.target.result;
var db = fs.db;
var transaction = db.transaction([fs.OBJECT_STORE_NAME], RW);
var store = transaction.objectStore(fs.OBJECT_STORE_NAME);
if(format) {
debug.info("format required");
var formatRequest = queuePending(store.put({}, "/"));
formatRequest.onsuccess = function(e) {
debug.info("format complete");
clearPending(formatRequest);
};
}
clearPending(openRequest);
};
openRequest.onupgradeneeded = function(e) {
db = e.target.result;
var openRequest = new OpenDBRequest(indexedDB.open(name), function(e) {
var db = fs.db = e.target.result;
if(db.objectStoreNames.contains("files")) {
db.deleteObjectStore("files");
}
@ -140,40 +173,57 @@ define(function(require) {
store.createIndex("name", "name", {unique: true});
format = true;
};
openRequest.onerror = function(e) {
clearPending(openRequest);
};
});
openRequest.then(function(e) {
fs.db = e.target.result;
var db = fs.db;
var transaction = new Transaction(db, [fs.OBJECT_STORE_NAME], RW);
var store = transaction.objectStore(fs.OBJECT_STORE_NAME);
if(format) {
debug.info("format required");
var clearRequest = new Request(store.clear());
clearRequest.then(function() {
var formatRequest = new Request(store.put({
"parent": null,
"name": "/"
}, "/"));
formatRequest.then(function(e) {
debug.info("format complete");
});
});
}
});
// API
this.mkdir = function mkdir(path) {
debug.info("mkdir");
var db = fs.db;
var d = when.defer();
var transaction = db.transaction([this.OBJECT_STORE_NAME], RW);
this.mkdir = function mkdir(name, transaction) {
debug.info("mkdir invoked");
var deferred = when.defer();
var transaction = transaction || new Transaction(fs.db, [this.OBJECT_STORE_NAME], RW);
var store = transaction.objectStore(fs.OBJECT_STORE_NAME);
var nameIndex = store.index("name");
var getRequest = queuePending(nameIndex.get(path));
getRequest.onsuccess = function(e) {
clearPending(getRequest);
var getRequest = new Request(nameIndex.get(name));
getRequest.then(function(e) {
var result = e.target.result;
if(result) {
debug.info("mkdir PATH_EXISTS_ERR");
d.reject(new DirectoryError(DirectoryError.PATH_EXISTS_ERR));
debug.info("mkdir error: PATH_EXISTS_ERR");
deferred.reject(new DirectoryError(DirectoryError.PATH_EXISTS_ERR));
} else {
var directoryRequest = queuePending(store.put({}, path));
directoryRequest.onsuccess = function(e) {
try{
var directoryRequest = new Request(store.put({
"parent": dirname(name),
"name": name
}, name));
directoryRequest.then(function(e) {
debug.info("mkdir complete");
clearPending(directoryRequest);
d.resolve();
};
deferred.resolve();
});
}catch(e){console.log(e);}
}
};
return d.promise;
}
});
return deferred.promise;
};
}
FileSystem.READY = 0;
FileSystem.PENDING = 1;