Re: Where are the response bits being read over the wire?

[Michael Becke]

Hi Steve,

Could it be that most of the responses are less that 4KB?  This would 
explain the zero times since the timer does not start until after the 
first read.  If would suggest setting responseEnd before the while 
loop.  Also, it could be that System.currentTimeMillis() does not 
provide enough resolution to measure the time accurately.

Mike

On May 13, 2004, at 5:22 PM, Steve Johnson wrote:

Hi All,

We are extending classes in an initail effort to instrument DNS, 
connect, response(first buffer read), and
download.
The DNS and connect looks pretty good.

Where are the bits actually being retrieved over the wire?
Overriding HttpMethodBase. byte[] getResponseBody() and adding 
response and download times returns reasonable
looking response times, but almost all the download duration times are 
0. Here is the current code. It is
derived from GetMethod.java

    public byte[] getResponseBody() {
        if (this.responseBody == null) {
            try {
                boolean firstReadDone = false;
                InputStream instream = getResponseBodyAsStream();
                if (instream != null) {
                    LOG.debug("Buffering response body");
                    ByteArrayOutputStream outstream = new 
ByteArrayOutputStream();
                    byte[] buffer = new byte[4096];
                    int len;
                    while ((len = instream.read(buffer)) > 0) {
                        outstream.write(buffer, 0, len);
                        if ( !firstReadDone ) {
                            responseEnd = System.currentTimeMillis();
                        }
                        
System.out.println("ApacheGetMethod.getResponseBody() path: " + 
getPath() + " bytes
read: " + len );
                        firstReadDone = true;
                    }
                    outstream.close();
                    setResponseStream(null);
                    this.responseBody = outstream.toByteArray();
                }
            } catch (IOException e) {
                LOG.error("I/O failure reading response body", e);
                this.responseBody = null;
            }
            long downloadEnd = System.currentTimeMillis();
            downloadDuration = downloadEnd - responseEnd;
            System.out.println("ApacheGetMethod.getResponseBody() 
path: " + getPath() + " responseEnd: " +
responseEnd + " downloadEnd: " + downloadEnd + " downloadDuration: " + 
downloadDuration );
        }
        return this.responseBody;
    }

Thanks for any ideas or information,

Steve

Steve Johnson
Software Engineer
Mercury Interactive
720 564 - 6532
USA, Canada and the Americas
720 564-6620
Hours: M-F 08:00-17:00 MST (Mountain Standard Time)
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