InputStreams for HTTP [S] response data: confirm a minimum memory buffer/reading early?

I need to manage data from a web service response. The format of the response data is under my control and is returned as a stream (net.rim.device.api.crypto.tls.TLSInputStream) to my BlackBerry application. The content of the feed is an XML stream that contains simple header information and then one or more 'chunks' of data. The data is compressed (gzip) and coded (Base64). BB app must decrypt, decompress, and then process the data in the stream. For the purposes of my application, I never need all of the data at a time; processing flow for real, that's what I'm looking for. I've implemented a pipe which, in pseudocode, looks like this:

SecureConnection httpsConn; already implemented

InputStream httpsStream = httpsConn.openInputStream ();

InputStream compressedStream = new (Base64InputStream.decode (httpsStream));

InputStream is = new GZIPInputStream (compressedStream);

int aByte = is.read ();

The goal is to put buffer in the bit data as possible so that the operation on the side of BB is not intensive memory as the data grows. The effective implementation of this pseudo code works very well.

The question I have is: I can confirm that the httpsStream I have created from the httpsConn is completely not himself read the BB in the specific RIM code? In other words, if there are 20 MB of data in the stream, I don't want to know that the stream has read data HTTPS completely - 20 MB all - and then put at disposal. Instead, I want to know only as much data is consumed as I makes (is.read) as well as a small buffer, perhaps, for the effectiveness of the network. A third way to ask the question: I think that it is supposed to be the definition of a well implemented InputStream, but I'm having a hard time finding a definitive '' Yes, J2ME (or BB) InputStreams promise to read HTTPS data on request and not all at once.

I expect tons of streaming audio and video apps are partial evidence that works real data on the fly on the Net.  Still, I left the details as XML processing by SAX - it's one on the behavior of the InputStream HTTP [S].  But it brings the fourth way to phrase my question: if I use SAX instead of a tool of DOM to treat my HTML because I want to monitor the pressures of large data flows, will I get cancelled by buffering I can't control in the low-level InputStream HTTP [S]?

Before you say, ' HTTP [S] is not where you should make streaming ", this is not streaming in itself. It is instead one - possibly large - answer to a POST.  Highly 'typical' web interaction

If changes in response based on the version of the OS, presumably 4.6 or better is the target platform.

Thank you!

-Del

I don't remember the said documentation. All I remember is that I proposed of workaround to someone on this forum and they later confirmed that he has solved the problem of buffering (they were streaming audio as great answers HTTP - streaming started to work very well, without a lot of latency).

Tags: BlackBerry Developers

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