requestTransaction accepts Promises&Generators
This commit is contained in:
Kevin Jahns
@@ -1,76 +0,0 @@
|
||||
|
||||
var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
|
||||
class Transaction {
|
||||
constructor (transaction) {
|
||||
this.transaction = transaction;
|
||||
}
|
||||
setOperation (op) {
|
||||
return new Promise((resolve, reject)=> {
|
||||
var req = this.transaction.objectStore("OperationBuffer").put(op);
|
||||
req.onsuccess = function () {
|
||||
resolve(op);
|
||||
};
|
||||
req.onerror = function () {
|
||||
reject("Could not set Operation!");
|
||||
};
|
||||
});
|
||||
}
|
||||
getOperation (uid) {
|
||||
return new Promise((resolve, reject)=>{
|
||||
var req = this.transaction.objectStore("OperationBuffer").get(uid);
|
||||
req.onsuccess = function () {
|
||||
resolve(req.result);
|
||||
};
|
||||
req.onerror = function () {
|
||||
reject("Could not get Operation");
|
||||
};
|
||||
});
|
||||
}
|
||||
}
|
||||
class DB {
|
||||
constructor (namespace : string) {
|
||||
this.namespace = namespace;
|
||||
this.ready = new Promise(function(yay, nay){
|
||||
var req = indexedDB.open(namespace); //eslint-disable-line no-undef
|
||||
req.onerror = function(){
|
||||
nay("Couldn't open the IndexedDB database!");
|
||||
};
|
||||
req.onsuccess = function(event){
|
||||
yay(event.target.result);
|
||||
};
|
||||
req.onupgradeneeded = function(event){
|
||||
var db = event.target.result;
|
||||
db.createObjectStore("OperationBuffer", {keyPath: "uid"});
|
||||
db.createObjectStore("StateVector", {keyPath: "user"});
|
||||
};
|
||||
}).catch(function(message){
|
||||
throw new Error(message);
|
||||
});
|
||||
}
|
||||
requestTransaction (generator : Function) {
|
||||
this.ready.then(function(){
|
||||
var gen = generator(3);//new Transaction(db.transaction(["OperationBuffer", "StateVector"], "readwrite"))
|
||||
gen.next();
|
||||
});
|
||||
}
|
||||
}
|
||||
return {
|
||||
"DB": DB,
|
||||
"Transaction": Transaction
|
||||
};
|
||||
})();
|
||||
|
||||
function requestTransaction(makeGen : Function){ //eslint-disable-line no-unused-vars
|
||||
var gen = makeGen([1, 2, 3]);
|
||||
function handle(result : Object){
|
||||
if (result.done) {
|
||||
return result.value;
|
||||
}
|
||||
return result.value.then(function(res){
|
||||
return handle(gen.next(res));
|
||||
}, function(err){
|
||||
return handle(gen.throw(err));
|
||||
});
|
||||
}
|
||||
return handle(gen.next());
|
||||
}
|
||||
110
src/IndexedDB.js
Normal file
110
src/IndexedDB.js
Normal file
@@ -0,0 +1,110 @@
|
||||
|
||||
var IndexedDB = (function(){ //eslint-disable-line no-unused-vars
|
||||
var GeneratorFunction = (function*(){}).constructor;
|
||||
|
||||
class Transaction {
|
||||
constructor (transaction) {
|
||||
this.transaction = transaction;
|
||||
}
|
||||
setOperation (op) {
|
||||
return new Promise((resolve, reject)=> {
|
||||
var req = this.transaction.objectStore("OperationBuffer").put(op);
|
||||
req.onsuccess = function () {
|
||||
resolve(op);
|
||||
};
|
||||
req.onerror = function () {
|
||||
reject("Could not set Operation!");
|
||||
};
|
||||
});
|
||||
}
|
||||
getOperation (uid) {
|
||||
return new Promise((resolve, reject)=>{
|
||||
var req = this.transaction.objectStore("OperationBuffer").get(uid);
|
||||
req.onsuccess = function () {
|
||||
resolve(req.result);
|
||||
};
|
||||
req.onerror = function () {
|
||||
reject("Could not get Operation");
|
||||
};
|
||||
});
|
||||
}
|
||||
getOperations () {
|
||||
return function* () {
|
||||
var op = yield this.getOperation(["u1", 0]);
|
||||
return op.uid;
|
||||
};
|
||||
}
|
||||
/*
|
||||
getOperations: (state_map)->
|
||||
flow = Promise.resolve()
|
||||
ops = []
|
||||
that = this
|
||||
hb = that.t.objectStore("HistoryBuffer")
|
||||
|
||||
that.getStateVector().then (end_state_vector)->
|
||||
for end_state of end_state_vector
|
||||
# convert to the db-structure
|
||||
do (end_state = end_state)->
|
||||
start_state =
|
||||
user: end_state.name
|
||||
state: state_map[end_state] ? 0
|
||||
|
||||
flow = flow.then ()->
|
||||
from = [start_state.user, start_state.number]
|
||||
to = [end_state.user, end_state.number]
|
||||
cursor = event.target.result
|
||||
if cursor?
|
||||
ops.push cursor.value # add Operation
|
||||
cursor.continue()
|
||||
else
|
||||
# got all ops from this user
|
||||
defer.resolve ops
|
||||
defer.promise
|
||||
*/
|
||||
}
|
||||
class DB {
|
||||
constructor (namespace : string) {
|
||||
this.namespace = namespace;
|
||||
this.ready = new Promise(function(yay, nay){
|
||||
var req = indexedDB.open(namespace); //eslint-disable-line no-undef
|
||||
req.onerror = function(){
|
||||
nay("Couldn't open the IndexedDB database!");
|
||||
};
|
||||
req.onsuccess = function(event){
|
||||
yay(event.target.result);
|
||||
};
|
||||
req.onupgradeneeded = function(event){
|
||||
var db = event.target.result;
|
||||
db.createObjectStore("OperationBuffer", {keyPath: "uid"});
|
||||
db.createObjectStore("StateVector", {keyPath: "user"});
|
||||
};
|
||||
}).catch(function(message){
|
||||
throw new Error(message);
|
||||
});
|
||||
}
|
||||
requestTransaction (makeGen : Function) {
|
||||
this.ready.then(function(db){
|
||||
var transaction = new Transaction(db.transaction(["OperationBuffer", "StateVector"], "readwrite"));
|
||||
var gen = makeGen.apply(transaction);
|
||||
function handle(result : Object){
|
||||
var v = result.value;
|
||||
if (result.done) {
|
||||
return v;
|
||||
} else if (v.constructor === Promise) {
|
||||
return result.value.then(function(res){
|
||||
return handle(gen.next(res));
|
||||
}, function(err){
|
||||
return handle(gen.throw(err));
|
||||
});
|
||||
} else if (v.constructor === GeneratorFunction){
|
||||
return handle(v.apply(transaction).next());
|
||||
} else {
|
||||
throw new Error("I do only accept Promises and Generators!");
|
||||
}
|
||||
}
|
||||
return handle(gen.next());
|
||||
});
|
||||
}
|
||||
}
|
||||
return DB;
|
||||
})();
|
||||
@@ -1,24 +1,31 @@
|
||||
/* @flow */
|
||||
/*eslint-env browser,jasmine,console */
|
||||
/*eslint-env browser,jasmine */
|
||||
|
||||
var number = 0;
|
||||
function llater(time){
|
||||
return new Promise(function(yay){
|
||||
setTimeout(function(){
|
||||
yay(number++);
|
||||
}, time); //eslint-disable-line no-undef
|
||||
});
|
||||
}
|
||||
if(typeof window !== "undefined"){
|
||||
describe("IndexedDB", function() {
|
||||
var ob = new IndexedDB("Test");
|
||||
|
||||
describe("IndexedDB", function() {
|
||||
it("can create transactions", function(done) {
|
||||
ob.requestTransaction(function*(){
|
||||
var op = yield this.setOperation({
|
||||
"uid": ["u1", 0],
|
||||
"stuff": true
|
||||
});
|
||||
expect(yield this.getOperation(["u1", 0]))
|
||||
.toEqual(op);
|
||||
done();
|
||||
});
|
||||
});
|
||||
|
||||
it("can create transactions", function(done) {
|
||||
requestTransaction(function*(numbers){
|
||||
expect(numbers).toEqual([1, 2, 3]);
|
||||
expect(yield llater(10)).toEqual(0);
|
||||
expect(yield llater(50)).toEqual(1);
|
||||
done();
|
||||
return 10;
|
||||
it("receive remaining operations", function(done){
|
||||
ob.requestTransaction(function*(){
|
||||
expect(yield this.getOperations(["u1", 0]))
|
||||
.toEqual({
|
||||
"uid": ["u1", 0],
|
||||
"stuff": true
|
||||
});
|
||||
done();
|
||||
});
|
||||
});
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user