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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#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 "chrome/common/ipc_sync_channel.h"
#include "chrome/common/message_router.h"
class SkBitmap;
class Task;
class VisitedLinkSlave;
struct WebPreferences;
class RenderDnsMaster;
class NotificationService;
class GreasemonkeySlave;
// The RenderThreadBase is the minimal interface that a RenderWidget expects
// from a render thread. The interface basically abstracts a way to send and
// receive messages. It is currently only used for testing.
class RenderThreadBase : public IPC::Message::Sender {
public:
virtual ~RenderThreadBase() {}
// True if currently sending a message.
virtual bool InSend() const = 0;
// Called to add or remove a listener for a particular message routing ID.
// These methods normally get delegated to a MessageRouter.
virtual void AddRoute(int32 routing_id, IPC::Channel::Listener* listener) = 0;
virtual void RemoveRoute(int32 routing_id) = 0;
};
// 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 RenderThreadBase,
public base::Thread {
public:
RenderThread(const std::wstring& channel_name);
virtual ~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();
// Gets the VisitedLinkSlave instance for this thread
VisitedLinkSlave* visited_link_slave() const { return visited_link_slave_; }
// Gets the GreasemonkeySlave instance for this thread
GreasemonkeySlave* greasemonkey_slave() const { return greasemonkey_slave_; }
// Do DNS prefetch resolution of a hostname.
void Resolve(const char* name, size_t length);
// See documentation on MessageRouter for AddRoute and RemoveRoute
virtual void AddRoute(int32 routing_id, IPC::Channel::Listener* listener);
virtual 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.
virtual bool InSend() const { return in_send_ != 0; }
protected:
// Called by the thread base class
virtual void Init();
virtual void CleanUp();
private:
void OnUpdateVisitedLinks(SharedMemoryHandle table);
void OnUpdateGreasemonkeyScripts(SharedMemoryHandle table);
void OnPluginMessage(const std::wstring& dll_path,
const std::vector<uint8>& data);
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();
// 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_;
GreasemonkeySlave* greasemonkey_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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