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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_RENDERER_RENDER_THREAD_H__
#define CHROME_RENDERER_RENDER_THREAD_H__
#include "base/ref_counted.h"
#include "base/shared_memory.h"
#include "base/task.h"
#include "base/thread.h"
#include "base/thread_local_storage.h"
#include "chrome/common/ipc_sync_channel.h"
#include "chrome/common/message_router.h"
class SkBitmap;
class Task;
class VisitedLinkSlave;
struct WebPreferences;
class RenderDnsMaster;
class NotificationService;
// The RenderThread class represents a background thread where RenderView
// instances live. The RenderThread supports an API that is used by its
// consumer to talk indirectly to the RenderViews and supporting objects.
// Likewise, it provides an API for the RenderViews to talk back to the main
// process (i.e., their corresponding WebContents).
//
// Most of the communication occurs in the form of IPC messages. They are
// routed to the RenderThread according to the routing IDs of the messages.
// The routing IDs correspond to RenderView instances.
class RenderThread : public IPC::Channel::Listener,
public IPC::Message::Sender,
public Thread {
public:
RenderThread(const std::wstring& channel_name);
~RenderThread();
// IPC::Channel::Listener implementation:
virtual void OnMessageReceived(const IPC::Message& msg);
virtual void OnChannelError();
// IPC::Message::Sender implementation:
virtual bool Send(IPC::Message* msg);
void AddFilter(IPC::ChannelProxy::MessageFilter* filter);
void RemoveFilter(IPC::ChannelProxy::MessageFilter* filter);
// The RenderThread instance for the current thread.
static RenderThread* current() {
return static_cast<RenderThread*>(tls_index_.Get());
}
VisitedLinkSlave* visited_link_slave() const { return visited_link_slave_; }
// Do DNS prefetch resolution of a hostname.
void Resolve(const char* name, size_t length);
// See documentation on MessageRouter for AddRoute and RemoveRoute
void AddRoute(int32 routing_id, IPC::Channel::Listener* listener);
void RemoveRoute(int32 routing_id);
// Invokes InformHostOfCacheStats after a short delay. Used to move this
// bookkeeping operation off the critical latency path.
void InformHostOfCacheStatsLater();
MessageLoop* owner_loop() { return owner_loop_; }
// Indicates if RenderThread::Send() is on the call stack.
bool in_send() const { return in_send_ != 0; }
protected:
// Called by the thread base class
virtual void Init();
virtual void CleanUp();
private:
void OnUpdateVisitedLinks(SharedMemoryHandle table);
void OnSetNextPageID(int32 next_page_id);
void OnCreateNewView(HWND parent_hwnd,
HANDLE modal_dialog_event,
const WebPreferences& webkit_prefs,
int32 view_id);
void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
void OnSetCacheCapacities(size_t min_dead_capacity,
size_t max_dead_capacity,
size_t capacity);
void OnGetCacheResourceStats();
// Gather usage statistics from the in-memory cache and inform our host.
// These functions should be call periodically so that the host can make
// decisions about how to allocation resources using current information.
void InformHostOfCacheStats();
static TLSSlot tls_index_;
// The message loop used to run tasks on the thread that started this thread.
MessageLoop* owner_loop_;
// Used only on the background render thread to implement message routing
// functionality to the consumers of the RenderThread.
MessageRouter router_;
std::wstring channel_name_;
scoped_ptr<IPC::SyncChannel> channel_;
// These objects live solely on the render thread.
VisitedLinkSlave* visited_link_slave_;
scoped_ptr<RenderDnsMaster> render_dns_master_;
scoped_ptr<ScopedRunnableMethodFactory<RenderThread> > cache_stats_factory_;
scoped_ptr<NotificationService> notification_service_;
int in_send_;
DISALLOW_EVIL_CONSTRUCTORS(RenderThread);
};
#endif // CHROME_RENDERER_RENDER_THREAD_H__
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