void CacheEntry::InvokeAvailableCallback(Callback const & aCallback)
{
LOG(("CacheEntry::InvokeAvailableCallback [this=%p, state=%s, cb=%p, r/o=%d, n/w=%d]",
this, StateString(mState), aCallback.mCallback.get(), aCallback.mReadOnly, aCallback.mNotWanted));
nsresult rv;
uint32_t const state = mState;
// When we are here, the entry must be loaded from disk
MOZ_ASSERT(state > LOADING || mIsDoomed);
bool onAvailThread;
rv = aCallback.OnAvailThread(&onAvailThread);
if (NS_FAILED(rv)) {
LOG((" target thread dead?"));
return;
}
if (!onAvailThread) {
// Dispatch to the right thread
nsRefPtr<AvailableCallbackRunnable> event =
new AvailableCallbackRunnable(this, aCallback);
rv = aCallback.mTargetThread->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL);
LOG((" redispatched, (rv = 0x%08x)", rv));
return;
}
if (NS_SUCCEEDED(mFileStatus) && !aCallback.mSecret) {
// Let the last-fetched and fetch-count properties be updated.
mFile->OnFetched();
}
if (mIsDoomed || aCallback.mNotWanted) {
LOG((" doomed or not wanted, notifying OCEA with NS_ERROR_CACHE_KEY_NOT_FOUND"));
aCallback.mCallback->OnCacheEntryAvailable(
nullptr, false, nullptr, NS_ERROR_CACHE_KEY_NOT_FOUND);
return;
}
if (state == READY) {
LOG((" ready/has-meta, notifying OCEA with entry and NS_OK"));
if (!aCallback.mSecret)
{
mozilla::MutexAutoLock lock(mLock);
BackgroundOp(Ops::FRECENCYUPDATE);
}
nsRefPtr<CacheEntryHandle> handle = NewHandle();
aCallback.mCallback->OnCacheEntryAvailable(
handle, false, nullptr, NS_OK);
return;
}
// R/O callbacks may do revalidation, let them fall through
if (aCallback.mReadOnly && !aCallback.mRevalidating) {
LOG((" r/o and not ready, notifying OCEA with NS_ERROR_CACHE_KEY_NOT_FOUND"));
aCallback.mCallback->OnCacheEntryAvailable(
nullptr, false, nullptr, NS_ERROR_CACHE_KEY_NOT_FOUND);
return;
}
// This is a new or potentially non-valid entry and needs to be fetched first.
// The CacheEntryHandle blocks other consumers until the channel
// either releases the entry or marks metadata as filled or whole entry valid,
// i.e. until MetaDataReady() or SetValid() on the entry is called respectively.
// Consumer will be responsible to fill or validate the entry metadata and data.
nsRefPtr<CacheEntryHandle> handle = NewWriteHandle();
rv = aCallback.mCallback->OnCacheEntryAvailable(
handle, state == WRITING, nullptr, NS_OK);
if (NS_FAILED(rv)) {
LOG((" writing/revalidating failed (0x%08x)", rv));
// Consumer given a new entry failed to take care of the entry.
OnHandleClosed(handle);
return;
}
LOG((" writing/revalidating"));
}
