cef/libcef/cef_context.cc

324 lines
7.9 KiB
C++

// Copyright (c) 2011 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that can
// be found in the LICENSE file.
#include "cef_context.h"
#include "browser_devtools_scheme_handler.h"
#include "browser_impl.h"
#include "browser_webkit_glue.h"
#include "base/bind.h"
#include "base/file_util.h"
#include "base/synchronization/waitable_event.h"
#if defined(OS_MACOSX) || defined(OS_WIN)
#include "crypto/nss_util.h"
#endif
// Both the CefContext constuctor and the CefContext::RemoveBrowser method need
// to initialize or reset to the same value.
const int kNextBrowserIdReset = 1;
// Global CefContext pointer
CefRefPtr<CefContext> _Context;
namespace {
// Used in multi-threaded message loop mode to observe shutdown of the UI
// thread.
class DestructionObserver : public MessageLoop::DestructionObserver
{
public:
DestructionObserver(base::WaitableEvent *event) : event_(event) {}
virtual void WillDestroyCurrentMessageLoop() {
MessageLoop::current()->RemoveDestructionObserver(this);
event_->Signal();
delete this;
}
private:
base::WaitableEvent *event_;
};
} // anonymous
bool CefInitialize(const CefSettings& settings, CefRefPtr<CefApp> application)
{
// Return true if the global context already exists.
if(_Context.get())
return true;
if(settings.size != sizeof(cef_settings_t)) {
NOTREACHED() << "invalid CefSettings structure size";
return false;
}
// Create the new global context object.
_Context = new CefContext();
// Initialize the global context.
return _Context->Initialize(settings, application);
}
void CefShutdown()
{
// Verify that the context is in a valid state.
if (!CONTEXT_STATE_VALID()) {
NOTREACHED() << "context not valid";
return;
}
// Must always be called on the same thread as Initialize.
if(!_Context->process()->CalledOnValidThread()) {
NOTREACHED() << "called on invalid thread";
return;
}
// Shut down the global context. This will block until shutdown is complete.
_Context->Shutdown();
// Delete the global context object.
_Context = NULL;
}
void CefDoMessageLoopWork()
{
// Verify that the context is in a valid state.
if (!CONTEXT_STATE_VALID()) {
NOTREACHED() << "context not valid";
return;
}
// Must always be called on the same thread as Initialize.
if(!_Context->process()->CalledOnValidThread()) {
NOTREACHED() << "called on invalid thread";
return;
}
_Context->process()->DoMessageLoopIteration();
}
void CefRunMessageLoop()
{
// Verify that the context is in a valid state.
if (!CONTEXT_STATE_VALID()) {
NOTREACHED() << "context not valid";
return;
}
// Must always be called on the same thread as Initialize.
if(!_Context->process()->CalledOnValidThread()) {
NOTREACHED() << "called on invalid thread";
return;
}
_Context->process()->RunMessageLoop();
}
void CefQuitMessageLoop()
{
// Verify that the context is in a valid state.
if (!CONTEXT_STATE_VALID()) {
NOTREACHED() << "context not valid";
return;
}
// Must always be called on the same thread as Initialize.
if(!_Context->process()->CalledOnValidThread()) {
NOTREACHED() << "called on invalid thread";
return;
}
_Context->process()->QuitMessageLoop();
}
// CefContext
CefContext::CefContext()
: initialized_(false),
shutting_down_(false),
next_browser_id_(kNextBrowserIdReset),
current_webviewhost_(NULL)
{
}
CefContext::~CefContext()
{
if(!shutting_down_)
Shutdown();
}
bool CefContext::Initialize(const CefSettings& settings,
CefRefPtr<CefApp> application)
{
settings_ = settings;
application_ = application;
cache_path_ = FilePath(CefString(&settings.cache_path));
#if defined(OS_MACOSX) || defined(OS_WIN)
// We want to be sure to init NSPR on the main thread.
crypto::EnsureNSPRInit();
#endif
process_.reset(new CefProcess(settings_.multi_threaded_message_loop));
process_->CreateChildThreads();
initialized_ = true;
// Perform DevTools scheme registration when CEF initialization is complete.
CefThread::PostTask(CefThread::UI, FROM_HERE,
base::Bind(&RegisterDevToolsSchemeHandler, true));
return true;
}
void CefContext::Shutdown()
{
// Must always be called on the same thread as Initialize.
DCHECK(process_->CalledOnValidThread());
shutting_down_ = true;
if(settings_.multi_threaded_message_loop) {
// Events that will be used to signal when shutdown is complete. Start in
// non-signaled mode so that the event will block.
base::WaitableEvent browser_shutdown_event(false, false);
base::WaitableEvent uithread_shutdown_event(false, false);
// Finish shutdown on the UI thread.
CefThread::PostTask(CefThread::UI, FROM_HERE,
NewRunnableMethod(this, &CefContext::UIT_FinishShutdown,
&browser_shutdown_event, &uithread_shutdown_event));
// Block until browser shutdown is complete.
browser_shutdown_event.Wait();
// Delete the process to destroy the child threads.
process_.reset(NULL);
// Block until UI thread shutdown is complete.
uithread_shutdown_event.Wait();
} else {
// Finish shutdown on the current thread, which should be the UI thread.
UIT_FinishShutdown(NULL, NULL);
// Delete the process to destroy the child threads.
process_.reset(NULL);
}
}
bool CefContext::AddBrowser(CefRefPtr<CefBrowserImpl> browser)
{
bool found = false;
AutoLock lock_scope(this);
// check that the browser isn't already in the list before adding
BrowserList::const_iterator it = browserlist_.begin();
for(; it != browserlist_.end(); ++it) {
if(it->get() == browser.get()) {
found = true;
break;
}
}
if(!found)
{
browser->UIT_SetUniqueID(next_browser_id_++);
browserlist_.push_back(browser);
}
return !found;
}
bool CefContext::RemoveBrowser(CefRefPtr<CefBrowserImpl> browser)
{
bool deleted = false;
bool empty = false;
{
AutoLock lock_scope(this);
BrowserList::iterator it = browserlist_.begin();
for(; it != browserlist_.end(); ++it) {
if(it->get() == browser.get()) {
browserlist_.erase(it);
deleted = true;
break;
}
}
if (browserlist_.empty()) {
next_browser_id_ = kNextBrowserIdReset;
empty = true;
}
}
if (empty) {
if (CefThread::CurrentlyOn(CefThread::UI)) {
webkit_glue::ClearCache();
} else {
CefThread::PostTask(CefThread::UI, FROM_HERE,
NewRunnableFunction(webkit_glue::ClearCache));
}
}
return deleted;
}
CefRefPtr<CefBrowserImpl> CefContext::GetBrowserByID(int id)
{
AutoLock lock_scope(this);
BrowserList::const_iterator it = browserlist_.begin();
for(; it != browserlist_.end(); ++it) {
if(it->get()->UIT_GetUniqueID() == id)
return it->get();
}
return NULL;
}
std::string CefContext::locale() const
{
std::string localeStr = CefString(&settings_.locale);
if (!localeStr.empty())
return localeStr;
return "en-US";
}
void CefContext::UIT_FinishShutdown(base::WaitableEvent* browser_shutdown_event,
base::WaitableEvent* uithread_shutdown_event)
{
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
BrowserList list;
{
AutoLock lock_scope(this);
if (!browserlist_.empty()) {
list = browserlist_;
browserlist_.clear();
}
}
// Destroy any remaining browser windows.
if (!list.empty()) {
BrowserList::iterator it = list.begin();
for(; it != list.end(); ++it)
(*it)->UIT_DestroyBrowser();
}
if (uithread_shutdown_event) {
// The destruction observer will signal the UI thread shutdown event when
// the UI thread has been destroyed.
MessageLoop::current()->AddDestructionObserver(
new DestructionObserver(uithread_shutdown_event));
// Signal the browser shutdown event now.
browser_shutdown_event->Signal();
}
}