imgRequestProxy::~imgRequestProxy()
{
/* destructor code */
NS_PRECONDITION(!mListener, "Someone forgot to properly cancel this request!");
// Unlock the image the proper number of times if we're holding locks on it.
// Note that UnlockImage() decrements mLocksHeld each time it's called.
if (mOwner) {
while (mLocksHeld)
UnlockImage();
}
// Explicitly set mListener to null to ensure that the RemoveProxy
// call below can't send |this| to an arbitrary listener while |this|
// is being destroyed. This is all belt-and-suspenders in view of the
// above assert.
NullOutListener();
if (mOwner) {
if (!mCanceled) {
mCanceled = PR_TRUE;
/* Call RemoveProxy with a successful status. This will keep the
channel, if still downloading data, from being canceled if 'this' is
the last observer. This allows the image to continue to download and
be cached even if no one is using it currently.
Passing false to aNotify means that we will still get
OnStopRequest, if needed.
*/
mOwner->RemoveProxy(this, NS_OK, PR_FALSE);
}
}
}
/* void cancelAndForgetObserver (in nsresult aStatus); */
NS_IMETHODIMP imgRequestProxy::CancelAndForgetObserver(nsresult aStatus)
{
if (mCanceled || !mOwner)
return NS_ERROR_FAILURE;
LOG_SCOPE(gImgLog, "imgRequestProxy::CancelAndForgetObserver");
mCanceled = PR_TRUE;
// Now cheat and make sure our removal from loadgroup happens async
PRBool oldIsInLoadGroup = mIsInLoadGroup;
mIsInLoadGroup = PR_FALSE;
// Passing false to aNotify means that mListener will still get
// OnStopRequest, if needed.
mOwner->RemoveProxy(this, aStatus, PR_FALSE);
mIsInLoadGroup = oldIsInLoadGroup;
if (mIsInLoadGroup) {
nsCOMPtr<nsIRunnable> ev =
NS_NEW_RUNNABLE_METHOD(imgRequestProxy, this, DoRemoveFromLoadGroup);
NS_DispatchToCurrentThread(ev);
}
NullOutListener();
return NS_OK;
}
void
imgRequestProxy::DoCancel(nsresult status)
{
// Passing false to aNotify means that mListener will still get
// OnStopRequest, if needed.
mOwner->RemoveProxy(this, status, PR_FALSE);
NullOutListener();
}
/* void cancelAndForgetObserver (in nsresult aStatus); */
NS_IMETHODIMP imgRequestProxy::CancelAndForgetObserver(nsresult aStatus)
{
if (mCanceled || !mOwner)
return NS_ERROR_FAILURE;
LOG_SCOPE(gImgLog, "imgRequestProxy::CancelAndForgetObserver");
mCanceled = PR_TRUE;
// Passing false to aNotify means that mListener will still get
// OnStopRequest, if needed.
mOwner->RemoveProxy(this, aStatus, PR_FALSE);
NullOutListener();
return NS_OK;
}
