Fwd: An Open Source implementation of Google Drive Realtime API

[田传武]

Hi all,

I'd like to share an open-source project which implements nearly all features of the google drive realtime api. Google Drive Realtime API provides Google Docs–style instant collaboration. It lets multiple people edit the same data simultaneously.

This project was inspired by Apache Wave, it is available on github at https://github.com/goodow/realtime-store

The server runs on vert.x, and uses a memory store by default, but also provides a persistent data store based on ElasticSearch and uses Redis to scale across multiple frontend servers. The redis+elasticsearch code is ported from livedb, really appreciate Joseph Gentle and the ShareJS community, thanks!

You can try out the features of the Realtime API on the live playground, or get the Android demo App on google play.

There is also an Objective-C client library for iOS and Mac OS X, but it is not yet fully tested, so please use at your own risk!

Enjoy!

[田传武]

realtime-store has there major modules, each module can be used separately:

1) realtime-operation  The operational transform library, currently only supports json-like data type, no xml support.

2) realtime-channel Distributed publish/subscribe event bus which penetrates from server to browser/iOS/Android, currently use SockJS for browser, WebSockets for iOS/Android, ant can be implemented using MQTT or XMPP.

3) realtime-store Persistence layer, currently supports memory and redis+elasticsearch storage. Realtime API is also implemented here.

So far, there has no editor integration, and doesn't contain any ui-related code, but will.

Benefit from the distributed publish/subscribe event bus across server/browser/iOS/Android and no ui specific code, it is easy to implement client libraries on multiple platforms.

[田传武]

The cursor issue was fixed for the live web playground and the android application, now you can do live concurrent editing like which google docs provides.

Currently supported features:

• User presence
• Undo/Redo
• Collaborative live JSON Data Model which is synchronized automatically between client and server
  
• Automatically data conflict resolution powered by operational transformation
  
• Two-Way Data Binding between the live model and view for javascript and android clients
• Javascript, Android and iOS client libraries based on the SockJS EventBus bridge
• Exactly the same API with Google Drive Realtime API

[Charles Chan]

Amazing efforts. Thanks for sharing.

Charles

[israel...@societao.com]

Can you tell me if your Android and iOS libraries uses SockJS instead websockets?

[田传武]

JavaScript client uses SockJS, Android client uses Java-WebSocket, iOS client uses SocketRocket.

[Martin Mauch]

By the description I'm not entirely clear: Can you use the client libs to work with Google Drive itself?

I would like to create an Android application that has live collaboration using Google Drive (in this case Mindmup).

If it is currently not possible: What would be needed to enable accessing Google Drive?

Best

  Martin

[田传武]

You cannot use realtime-store with Google Drive, realtime-store has its own server and clients.

[Martin Mauch]

So do I understand correctly that the client API is identical but it uses a different client-server protocol?

[田传武]

Yes, the client API is identical and the client-server protocol is also very similar to each other.

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