Network Address Space Each instance of the emulator runs behind a virtual router/firewall service that isolates it from your development machine’s network interfaces and settings and from the internet. An emulated device can not see your development machine or other emulator instances on the network. Instead, it sees only that it is connected through Ethernet … Read more
The first thing you have to decide is a general policy about which side is considered “authoritative” in case of conflicting changes. I.e.: suppose Record #125 is changed on the server on January 5th at 10pm and the same record is changed on one of the phones (let’s call it Client A) on January 5th … Read more
With RESTful HTTP you have a stateless request/response system where the client sends request and server returns the response. With webSockets you have a stateful (or potentially stateful) message passing system where messages can be sent either way and sending a message has a lower overhead than with a RESTful HTTP request/response. The two are … Read more
You can use encoding/binary’s ByteOrder to do this for 16, 32, 64 bit types Play package main import “fmt” import “encoding/binary” func main() { var mySlice = []byte{244, 244, 244, 244, 244, 244, 244, 244} data := binary.BigEndian.Uint64(mySlice) fmt.Println(data) }
There is no TCP API that will tell you the current state of the connection. isConnected() and isClosed() tell you the current state of your socket. Not the same thing. isConnected() tells you whether you have connected this socket. You have, so it returns true. isClosed() tells you whether you have closed this socket. Until … Read more
http://pypi.python.org/pypi/websocket-client/ Ridiculously easy to use. sudo pip install websocket-client Sample client code: #!/usr/bin/python from websocket import create_connection ws = create_connection(“ws://localhost:8080/websocket”) print “Sending ‘Hello, World’…” ws.send(“Hello, World”) print “Sent” print “Receiving…” result = ws.recv() print “Received ‘%s'” % result ws.close() Sample server code: #!/usr/bin/python import websocket import thread import time def on_message(ws, message): print message def … Read more
I have no idea why the HttpURLConnection class does not provide any means to send files without having to compose the file wrapper manually. Here’s what I ended up doing, but if someone knows a better solution, please let me know. Input data: Bitmap bitmap = myView.getBitmap(); Static stuff: String attachmentName = “bitmap”; String attachmentFileName … Read more
For a given website / web-application, you can use react either client-side, server-side or both. Client-Side Over here, you are completely running ReactJS on the browser. This is the simplest setup and includes most examples (including the ones on http://reactjs.org). The initial HTML rendered by the server is a placeholder and the entire UI is … Read more
You should look at how distributed change management works. Look at SVN, CVS and other repositories that manage deltas work. You have several use cases. Synchronize changes. Your change-log (or delta history) approach looks good for this. Clients send their deltas to the server; server consolidates and distributes the deltas to the clients. This is … Read more