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Create indexeddb worker when starting the store #627

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merged 4 commits into from
Mar 9, 2018
Merged

Create indexeddb worker when starting the store #627

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8bd68e0
Create indexeddb worker when starting the store
dbkr Mar 9, 2018
0be679d
Make local variable look less like a global
dbkr Mar 9, 2018
5c2dfb1
Hopefully clarify _startPromise
dbkr Mar 9, 2018
dc3ffb3
Fix jsdoc
dbkr Mar 9, 2018
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35 changes: 23 additions & 12 deletions src/store/indexeddb-remote-backend.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,25 +26,23 @@ import Promise from 'bluebird';
* @param {string} workerScript URL to the worker script
* @param {string=} dbName Optional database name. The same name must be used
* to open the same database.
* @param {Object} WorkerApi The web worker compatible interface object
* @param {Object} workerApi The web worker compatible interface object
*/
const RemoteIndexedDBStoreBackend = function RemoteIndexedDBStoreBackend(
workerScript, dbName, WorkerApi,
workerScript, dbName, workerApi,
) {
this._workerScript = workerScript;
this._dbName = dbName;
this._worker = new WorkerApi(workerScript);
this._workerApi = workerApi;
this._worker = null;
this._nextSeq = 0;
// The currently in-flight requests to the actual backend
this._inFlight = {
// seq: promise,
};

this._worker.onmessage = this._onWorkerMessage.bind(this);

// tell the worker the db name.
this._startPromise = this._doCmd('_setupWorker', [this._dbName]).then(() => {
console.log("IndexedDB worker is ready");
});
// Once we start connecting, we keep the promise and re-use it
// if we try to connect again
this._startPromise = null;
};


Expand All @@ -55,7 +53,7 @@ RemoteIndexedDBStoreBackend.prototype = {
* @return {Promise} Resolves if successfully connected.
*/
connect: function() {
return this._startPromise.then(() => this._doCmd('connect'));
return this._ensureStarted().then(() => this._doCmd('connect'));
},

/**
Expand All @@ -64,7 +62,7 @@ RemoteIndexedDBStoreBackend.prototype = {
* @return {Promise} Resolved when the database is cleared.
*/
clearDatabase: function() {
return this._startPromise.then(() => this._doCmd('clearDatabase'));
return this._ensureStarted().then(() => this._doCmd('clearDatabase'));
},

/**
Expand Down Expand Up @@ -93,6 +91,19 @@ RemoteIndexedDBStoreBackend.prototype = {
return this._doCmd('getUserPresenceEvents');
},

_ensureStarted: function() {
if (this._startPromise === null) {
this._worker = new this._workerApi(this._workerScript);
this._worker.onmessage = this._onWorkerMessage.bind(this);

// tell the worker the db name.
this._startPromise = this._doCmd('_setupWorker', [this._dbName]).then(() => {
console.log("IndexedDB worker is ready");
});
}
return this._startPromise;
},

_doCmd: function(cmd, args) {
// wrap in a q so if the postMessage throws,
// the promise automatically gets rejected
Expand Down