How can we identify a unique nsHTTPChannel?

I am doing some development on the firefox both with javascript and C++ for some XPCOM components开发者_开发问答.

I am trying to monitor the http activity with nsIHttpActivityDistributor.

The problem now is , is there any flag or id that belong to nsIHttpChannel that I can use to identify a unique nsHttpChannel object?

I want to save some nsIHttpChannel referred objects in C++ and then process later in Javascript or C++. The thing is that currently I cannot find a elegent way to identify a channel object that can used both in js and C++, which is used to log it clearly into a log file.

Any idea?

You can easily add your own data to HTTP channels, they always implement nsIPropertyBag2 and nsIWritablePropertyBag2 interfaces. Something along these lines (untested code, merely to illustrate the principle):

static PRInt64 maxChannelID = -1;

...

nsCOMPtr<nsIWritablePropertyBag2> bag = do_QueryInterface(channel);
if (!bag)
  ...

nsAutoString prop(NS_LITERAL_STRING("myChannelID"));
PRInt64 channelID;

rv = bag->GetPropertyAsInt64(prop, &channelID);
if (NS_FAILED(rv))
{
  // First time that we see that channel, assign it an ID
  channelID = ++maxChannelID;
  rv = bag->SetPropertyAsInt64(prop, channelID)
  if (NS_FAILED(rv))
    ...
}

printf("Channel ID: %i\n", channelID);

You might want to check what happens on HTTP redirect however. I think that channel properties are copied over to the new channel in that case, not sure whether this is desirable for you.