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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 <vector>
#include "base/android/jni_android.h"
#include "base/android/jni_string.h"
#include "base/android/scoped_java_ref.h"
#include "base/basictypes.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "content/browser/android/content_view_statics.h"
#include "content/common/android/address_parser.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/ContentViewStatics_jni.h"
using base::android::ConvertJavaStringToUTF16;
using base::android::ConvertUTF16ToJavaString;
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.
virtual void RenderProcessExited(content::RenderProcessHost* host,
base::ProcessHandle handle,
base::TerminationStatus status,
int exit_code) override {
StopWatching(host);
}
virtual void RenderProcessHostDestroyed(
content::RenderProcessHost* host) override {
StopWatching(host);
}
// Suspends timers in all current render processes.
void SuspendWebKitSharedTimers() {
DCHECK(suspended_processes_.empty());
for (content::RenderProcessHost::iterator i(
content::RenderProcessHost::AllHostsIterator());
!i.IsAtEnd(); i.Advance()) {
content::RenderProcessHost* host = i.GetCurrentValue();
host->AddObserver(this);
host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(true));
suspended_processes_.push_back(host->GetID());
}
}
// Resumes timers in processes that were previously stopped.
void ResumeWebkitSharedTimers() {
for (std::vector<int>::const_iterator it = suspended_processes_.begin();
it != suspended_processes_.end(); ++it) {
content::RenderProcessHost* host =
content::RenderProcessHost::FromID(*it);
DCHECK(host);
host->RemoveObserver(this);
host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(false));
}
suspended_processes_.clear();
}
private:
void StopWatching(content::RenderProcessHost* host) {
std::vector<int>::iterator pos = std::find(suspended_processes_.begin(),
suspended_processes_.end(),
host->GetID());
DCHECK_NE(pos, suspended_processes_.end());
host->RemoveObserver(this);
suspended_processes_.erase(pos);
}
std::vector<int /* RenderProcessHost id */> suspended_processes_;
};
base::LazyInstance<SuspendedProcessWatcher> g_suspended_processes_watcher =
LAZY_INSTANCE_INITIALIZER;
} // namespace
// Returns the first substring consisting of the address of a physical location.
static jstring FindAddress(JNIEnv* env, jclass clazz, jstring addr) {
base::string16 content_16 = ConvertJavaStringToUTF16(env, addr);
base::string16 result_16;
if (content::address_parser::FindAddress(content_16, &result_16))
return ConvertUTF16ToJavaString(env, result_16).Release();
return NULL;
}
static void SetWebKitSharedTimersSuspended(JNIEnv* env,
jclass obj,
jboolean suspend) {
if (suspend) {
g_suspended_processes_watcher.Pointer()->SuspendWebKitSharedTimers();
} else {
g_suspended_processes_watcher.Pointer()->ResumeWebkitSharedTimers();
}
}
namespace content {
bool RegisterWebViewStatics(JNIEnv* env) {
return RegisterNativesImpl(env);
}
} // namespace content
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