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#include "config.h"
#include "NetworkResourceLoadScheduler.h"
#include "HostRecord.h"
#include "Logging.h"
#include "NetworkProcess.h"
#include "NetworkResourceLoadParameters.h"
#include "NetworkResourceLoader.h"
#include "SyncNetworkResourceLoader.h"
#include <wtf/MainThread.h>
#include <wtf/text/CString.h>
#if ENABLE(NETWORK_PROCESS)
using namespace WebCore;
namespace WebKit {
static const unsigned maxRequestsInFlightForNonHTTPProtocols = 20;
NetworkResourceLoadScheduler::NetworkResourceLoadScheduler()
: m_nonHTTPProtocolHost(HostRecord::create(String(), maxRequestsInFlightForNonHTTPProtocols))
, m_requestTimer(this, &NetworkResourceLoadScheduler::requestTimerFired)
{
platformInitializeMaximumHTTPConnectionCountPerHost();
}
void NetworkResourceLoadScheduler::scheduleServePendingRequests()
{
if (!m_requestTimer.isActive())
m_requestTimer.startOneShot(0);
}
void NetworkResourceLoadScheduler::requestTimerFired(WebCore::Timer<NetworkResourceLoadScheduler>*)
{
servePendingRequests();
}
void NetworkResourceLoadScheduler::scheduleLoader(PassRefPtr<SchedulableLoader> loader)
{
ResourceLoadPriority priority = loader->priority();
const ResourceRequest& resourceRequest = loader->request();
LOG(NetworkScheduling, "(NetworkProcess) NetworkResourceLoadScheduler::scheduleLoader resource '%s'", resourceRequest.url().string().utf8().data());
HostRecord* host = hostForURL(resourceRequest.url(), CreateIfNotFound);
bool hadRequests = host->hasRequests();
host->scheduleResourceLoader(loader);
if (priority > ResourceLoadPriorityLow || !resourceRequest.url().protocolIsInHTTPFamily() || (priority == ResourceLoadPriorityLow && !hadRequests)) {
// Try to request important resources immediately.
host->servePendingRequests(priority);
return;
}
// Handle asynchronously so early low priority requests don't get scheduled before later high priority ones.
scheduleServePendingRequests();
}
HostRecord* NetworkResourceLoadScheduler::hostForURL(const WebCore::KURL& url, CreateHostPolicy createHostPolicy)
{
if (!url.protocolIsInHTTPFamily())
return m_nonHTTPProtocolHost.get();
m_hosts.checkConsistency();
String hostName = url.host();
HostRecord* host = m_hosts.get(hostName);
if (!host && createHostPolicy == CreateIfNotFound) {
RefPtr<HostRecord> newHost = HostRecord::create(hostName, m_maxRequestsInFlightPerHost);
host = newHost.get();
m_hosts.add(hostName, newHost.release());
}
return host;
}
void NetworkResourceLoadScheduler::removeLoader(SchedulableLoader* loader)
{
ASSERT(isMainThread());
ASSERT(loader);
LOG(NetworkScheduling, "(NetworkProcess) NetworkResourceLoadScheduler::removeLoadIdentifier removing loader %s", loader->request().url().string().utf8().data());
HostRecord* host = loader->hostRecord();
// Due to a race condition the WebProcess might have messaged the NetworkProcess to remove this identifier
// after the NetworkProcess has already removed it internally.
// In this situation we might not have a HostRecord to clean up.
if (host)
host->removeLoader(loader);
scheduleServePendingRequests();
}
void NetworkResourceLoadScheduler::receivedRedirect(SchedulableLoader* loader, const WebCore::KURL& redirectURL)
{
ASSERT(isMainThread());
LOG(NetworkScheduling, "(NetworkProcess) NetworkResourceLoadScheduler::receivedRedirect loader originally for '%s' redirected to '%s'", loader->request().url().string().utf8().data(), redirectURL.string().utf8().data());
HostRecord* oldHost = loader->hostRecord();
// The load may have been cancelled while the message was in flight from network thread to main thread.
if (!oldHost)
return;
HostRecord* newHost = hostForURL(redirectURL, CreateIfNotFound);
if (oldHost->name() == newHost->name())
return;
oldHost->removeLoader(loader);
newHost->addLoaderInProgress(loader);
}
void NetworkResourceLoadScheduler::servePendingRequests(ResourceLoadPriority minimumPriority)
{
LOG(NetworkScheduling, "(NetworkProcess) NetworkResourceLoadScheduler::servePendingRequests Serving requests for up to %i hosts with minimum priority %i", m_hosts.size(), minimumPriority);
m_requestTimer.stop();
m_nonHTTPProtocolHost->servePendingRequests(minimumPriority);
m_hosts.checkConsistency();
Vector<RefPtr<HostRecord>> hostsToServe;
copyValuesToVector(m_hosts, hostsToServe);
size_t size = hostsToServe.size();
for (size_t i = 0; i < size; ++i) {
HostRecord* host = hostsToServe[i].get();
if (host->hasRequests())
host->servePendingRequests(minimumPriority);
else
m_hosts.remove(host->name());
}
}
static bool removeScheduledLoadersCalled = false;
void NetworkResourceLoadScheduler::removeScheduledLoaders(void* context)
{
ASSERT(isMainThread());
ASSERT(removeScheduledLoadersCalled);
NetworkResourceLoadScheduler* scheduler = static_cast<NetworkResourceLoadScheduler*>(context);
scheduler->removeScheduledLoaders();
}
void NetworkResourceLoadScheduler::removeScheduledLoaders()
{
Vector<RefPtr<SchedulableLoader>> loadersToRemove;
{
MutexLocker locker(m_loadersToRemoveMutex);
loadersToRemove = m_loadersToRemove;
m_loadersToRemove.clear();
removeScheduledLoadersCalled = false;
}
for (size_t i = 0; i < loadersToRemove.size(); ++i)
removeLoader(loadersToRemove[i].get());
}
void NetworkResourceLoadScheduler::scheduleRemoveLoader(SchedulableLoader* loader)
{
MutexLocker locker(m_loadersToRemoveMutex);
m_loadersToRemove.append(loader);
if (!removeScheduledLoadersCalled) {
removeScheduledLoadersCalled = true;
callOnMainThread(NetworkResourceLoadScheduler::removeScheduledLoaders, this);
}
}
uint64_t NetworkResourceLoadScheduler::hostsPendingCount() const
{
uint64_t count = m_nonHTTPProtocolHost->pendingRequestCount() ? 1 : 0;
HostMap::const_iterator end = m_hosts.end();
for (HostMap::const_iterator i = m_hosts.begin(); i != end; ++i) {
if (i->value->pendingRequestCount())
++count;
}
return count;
}
uint64_t NetworkResourceLoadScheduler::loadsPendingCount() const
{
uint64_t count = m_nonHTTPProtocolHost->pendingRequestCount();
HostMap::const_iterator end = m_hosts.end();
for (HostMap::const_iterator i = m_hosts.begin(); i != end; ++i)
count += i->value->pendingRequestCount();
return count;
}
uint64_t NetworkResourceLoadScheduler::hostsActiveCount() const
{
uint64_t count = 0;
if (m_nonHTTPProtocolHost->activeLoadCount())
count = 1;
HostMap::const_iterator end = m_hosts.end();
for (HostMap::const_iterator i = m_hosts.begin(); i != end; ++i) {
if (i->value->activeLoadCount())
++count;
}
return count;
}
uint64_t NetworkResourceLoadScheduler::loadsActiveCount() const
{
uint64_t count = m_nonHTTPProtocolHost->activeLoadCount();
HostMap::const_iterator end = m_hosts.end();
for (HostMap::const_iterator i = m_hosts.begin(); i != end; ++i)
count += i->value->activeLoadCount();
return count;
}
} // namespace WebKit
#endif // ENABLE(NETWORK_PROCESS)
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