Stall network detection

Currently, I'm trying to understand how to implement a network dropout detector in my application. I use HTTP and so often keep a socket opened for a long time and do a lot of things on it. Therefore, a random network dropping out really hurts to ease of use and I need to address without delay as the BONE to cause a timeout. I was wondering if anyone could share any advice or code on how best implemented it. I know that Peter has mentioned something himself, of course anything either would be useful.

I thought a lot lately about the different ways that I could approach this problem:

The simplest way possible, in theory, would be a kind of timer. I would like to start it at the beginning of any sequence of operations of e/s, and "kick after (possibly before) each successful socket read or write." The problem is that there is no effective obvious way to do it with the BlackBerry API. (at least not without coarse abuse TimerTask.)

Another option would be to have a TimerTask that runs whenever the is open, controls a set of variables on regular intervals. I would update these variables around every success in reading/writing, and it could make its conclusions on this basis. Of course, this raises a lot of questions on what the TimerTask interval should be, when start/stop, etc..

Any thoughts/ideas?

For a general watchdog, I use RealtimeClockListener. But he gets only a kick every minute which is probably too long for the detection of dropping out of your network. But you can use it to make sure that your stall network Detection still works.

Personally, I have a dislike of timers because they seem to be just the threads with time management, handling I can do myself.

And that's what I would do in this case. I understand that you don't need that level of detail, but I'll put it in other players who are maybe not as clever as you are.

I would like to have a watchdog thread, in a shared storage (probably RuntimeStore), all the time. It has two States, while waiting for a timeout and idle. In both States, she waits on the synchronized object StallDetection (I just made that name, it's just an object). He uses wait/notify on this object to tell the Thread to do some work.

This thread has two special methods, startTimeout() and cancelTimeout().

Use Thread will startTimeout on this thread, through Assembly and time-out interval. This startTimeout method will set the timeout and save the connection object, and then notify the StallDetection object. This will give the wire in life, ii will find that it has a connection, but the timeout did not, then he will change his timeout so that he wakes up in the time limit.

Now, there are only two possible situations:

(a) the network Thread called cancelTimeout to cancel the timeout, because it has a good answer. cancelTimeout clears the connection just waiting for the Thread. When the thread wakes up, he'll find the elapsed wait time, but there is no connection to cancel, so it will be simply define another timeout, in the distant future and wait again.

(b) the network Thread is suspended and does not cancel the timeout. Then the Thread will wake up and see there is a link to cancel and cancel.

It is essentially an implementation of a timer, without start-up costs and stop all the time. I think it's better in your situation where you have a network of Red wire all the time. But perhaps not an ad hoc http connection.

Rather than use the two methods on the Thread, it should probably put up a model of the observer and so could be useful for a number of other situations.

I would use the RealtimeClockListener to just check this thread is alive (isAlive()), then start it again if not.

I would be interested in other options if people have other ideas and of course improvements on this!

And I hope this helps.

Tags: BlackBerry Developers

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