void MemoryCache::pruneDeadResourcesToSize(unsigned targetSize)
{
if (m_inPruneResources)
return;
TemporaryChange<bool> reentrancyProtector(m_inPruneResources, true);
int size = m_allResources.size();
// See if we have any purged resources we can evict.
for (int i = 0; i < size; i++) {
CachedResource* current = m_allResources[i].m_tail;
while (current) {
CachedResource* prev = current->m_prevInAllResourcesList;
if (current->wasPurged()) {
ASSERT(!current->hasClients());
ASSERT(!current->isPreloaded());
evict(current);
}
current = prev;
}
}
if (targetSize && m_deadSize <= targetSize)
return;
bool canShrinkLRULists = true;
for (int i = size - 1; i >= 0; i--) {
// Remove from the tail, since this is the least frequently accessed of the objects.
CachedResource* current = m_allResources[i].m_tail;
// First flush all the decoded data in this queue.
while (current) {
// Protect 'previous' so it can't get deleted during destroyDecodedData().
CachedResourceHandle<CachedResource> previous = current->m_prevInAllResourcesList;
ASSERT(!previous || previous->inCache());
if (!current->hasClients() && !current->isPreloaded() && current->isLoaded()) {
// Destroy our decoded data. This will remove us from
// m_liveDecodedResources, and possibly move us to a different
// LRU list in m_allResources.
current->destroyDecodedData();
if (targetSize && m_deadSize <= targetSize)
return;
}
// Decoded data may reference other resources. Stop iterating if 'previous' somehow got
// kicked out of cache during destroyDecodedData().
if (previous && !previous->inCache())
break;
current = previous.get();
}
// Now evict objects from this queue.
current = m_allResources[i].m_tail;
while (current) {
CachedResourceHandle<CachedResource> previous = current->m_prevInAllResourcesList;
ASSERT(!previous || previous->inCache());
if (!current->hasClients() && !current->isPreloaded() && !current->isCacheValidator()) {
if (!makeResourcePurgeable(current))
evict(current);
if (targetSize && m_deadSize <= targetSize)
return;
}
if (previous && !previous->inCache())
break;
current = previous.get();
}
// Shrink the vector back down so we don't waste time inspecting
// empty LRU lists on future prunes.
if (m_allResources[i].m_head)
canShrinkLRULists = false;
else if (canShrinkLRULists)
m_allResources.resize(i);
}
}
void Loader::Host::didReceiveResponse(SubresourceLoader* loader, const ResourceResponse& response)
{
RefPtr<Host> protector(this);
Request* request = m_requestsLoading.get(loader);
// FIXME: This is a workaround for <rdar://problem/5236843>
// If a load starts while the frame is still in the provisional state
// (this can be the case when loading the user style sheet), committing the load then causes all
// requests to be removed from the m_requestsLoading map. This means that request might be null here.
// In that case we just return early.
// ASSERT(request);
if (!request)
return;
CachedResource* resource = request->cachedResource();
if (resource->isCacheValidator()) {
if (response.httpStatusCode() == 304) {
// 304 Not modified / Use local copy
m_requestsLoading.remove(loader);
loader->clearClient();
request->docLoader()->decrementRequestCount();
// Existing resource is ok, just use it updating the expiration time.
cache()->revalidationSucceeded(resource, response);
if (request->docLoader()->frame())
request->docLoader()->frame()->loader()->checkCompleted();
delete request;
servePendingRequests();
return;
}
// Did not get 304 response, continue as a regular resource load.
cache()->revalidationFailed(resource);
}
resource->setResponse(response);
String encoding = response.textEncodingName();
if (!encoding.isNull())
resource->setEncoding(encoding);
if (request->isMultipart()) {
ASSERT(resource->isImage());
static_cast<CachedImage*>(resource)->clear();
if (request->docLoader()->frame())
request->docLoader()->frame()->loader()->checkCompleted();
} else if (response.isMultipart()) {
request->setIsMultipart(true);
// We don't count multiParts in a DocLoader's request count
request->docLoader()->decrementRequestCount();
// If we get a multipart response, we must have a handle
ASSERT(loader->handle());
if (!resource->isImage())
loader->handle()->cancel();
}
}
