Are socket connections faster than http on Blackbe

问题:

I'm writing an app for Blackberry that was originally implemented in standard J2ME. The network connection was done using Connector.open("socket://...:80/...") instead of http://

Now, I've implemented the connection using both methods, and it seems like some times, the socket method is more responsive, and some times it doesn't work at all. Is there a significant difference between the two? Mostly what I'm trying to achieve is responsiveness from the connection to get a smooth progress bar.

回答1:

Blackberry's implementation of http and https provide more options for connecting to the target server than socket, and, of course, implement all the HTTP protocol stuff for you. I've not benchmarked them, but it makes a certain amount of sense that direct TCP via socket would be quicker in some cases, especially if what is listening on port 80 isn't an HTTP server (no protocol overhead)

I've had difficulty in the past with different network providers, some requiring deviceside=true others deviceside=false, and no real way to know until the first support call for that network came in.

Mostly what I'm trying to achieve is responsiveness from the connection to get a smooth progress bar.

Pardon my saying so, but a "smooth progress bar" is "gilding the lily" - nice to have and look at, but not critical to the application's function, reliability or robustness. Go with what is more robust and reduces code size - likely http in this case.

回答2:

Since both operate over a network I don't think you can guarantee a smooth progress bar. You might have more chance of that if you remind the person to stay in one place so you have a chance of a consistent connection ;)

There is less overhead with a socket connection than an HTTP one. In fact, HTTP connections run over the socket connection. You can take advantage of the reduced overhead of the socket connection to appear more responsive, but you will likely have more work to do than you would with HTTP. The API is more low-level so coding is more complex.

回答3:

One difference between a socket and an HTTP connection on the BlackBerry is that HTTP connections may be transparently routed via an HTTP proxy in the case of BES and BIS connections.

回答4:

In theory sockets will be faster, but then you're responsible for managing the overhead of rolling your own protocol (depending on complexity). Though sockets are more lightweight, I've found that HTTP and all the comes with it greatly reduces the headache.