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// Copyright (c) 2012 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.
#include <jni.h>
#include <set>
#include "base/android/jni_android.h"
#include "base/android/jni_string.h"
#include "base/android/scoped_java_ref.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/common/view_messages.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_process_host_observer.h"
#include "jni/ContentViewStaticsImpl_jni.h"
using base::android::ConvertJavaStringToUTF16;
using base::android::ConvertUTF16ToJavaString;
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
namespace {
// TODO(pliard): http://crbug.com/235909. Move WebKit shared timer toggling
// functionality out of ContentViewStatistics and not be build on top of
// blink::Platform::SuspendSharedTimer.
// TODO(pliard): http://crbug.com/235912. Add unit tests for WebKit shared timer
// toggling.
// This tracks the renderer processes that received a suspend request. It's
// important on resume to only resume the renderer processes that were actually
// suspended as opposed to all the current renderer processes because the
// suspend calls are refcounted within BlinkPlatformImpl and it expects a
// perfectly matched number of resume calls.
// Note that this class is only accessed from the UI thread.
class SuspendedProcessWatcher : public content::RenderProcessHostObserver {
public:
// If the process crashes, stop watching the corresponding RenderProcessHost
// and ensure it doesn't get over-resumed.
void RenderProcessExited(
content::RenderProcessHost* host,
const content::ChildProcessTerminationInfo& info) override {
StopWatching(host);
}
void RenderProcessHostDestroyed(content::RenderProcessHost* host) override {
StopWatching(host);
}
// Suspends timers in all current render processes.
void SuspendWebKitSharedTimers() {
for (content::RenderProcessHost::iterator i(
content::RenderProcessHost::AllHostsIterator());
!i.IsAtEnd(); i.Advance()) {
content::RenderProcessHost* host = i.GetCurrentValue();
if (suspended_processes_.insert(host->GetID()).second) {
host->AddObserver(this);
host->GetRendererInterface()->SetWebKitSharedTimersSuspended(true);
}
}
}
// Resumes timers in processes that were previously stopped.
void ResumeWebkitSharedTimers() {
for (auto id : suspended_processes_) {
content::RenderProcessHost* host = content::RenderProcessHost::FromID(id);
DCHECK(host);
host->RemoveObserver(this);
host->GetRendererInterface()->SetWebKitSharedTimersSuspended(false);
}
suspended_processes_.clear();
}
private:
void StopWatching(content::RenderProcessHost* host) {
auto pos = suspended_processes_.find(host->GetID());
DCHECK(pos != suspended_processes_.end());
host->RemoveObserver(this);
suspended_processes_.erase(pos);
}
std::set<int /* RenderProcessHost id */> suspended_processes_;
};
base::LazyInstance<SuspendedProcessWatcher>::DestructorAtExit
g_suspended_processes_watcher = LAZY_INSTANCE_INITIALIZER;
} // namespace
static void JNI_ContentViewStaticsImpl_SetWebKitSharedTimersSuspended(
JNIEnv* env,
const JavaParamRef<jclass>& obj,
jboolean suspend) {
if (suspend) {
g_suspended_processes_watcher.Pointer()->SuspendWebKitSharedTimers();
} else {
g_suspended_processes_watcher.Pointer()->ResumeWebkitSharedTimers();
}
}
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