content/browser/android/content_view_statics.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <jni.h>
   6 #include <vector>
   7
   8 #include "base/android/jni_android.h"
   9 #include "base/android/jni_string.h"
  10 #include "base/android/scoped_java_ref.h"
  11 #include "base/basictypes.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/logging.h"
  14 #include "content/browser/android/content_view_statics.h"
  15 #include "content/common/android/address_parser.h"
  16 #include "content/common/view_messages.h"
  17 #include "content/public/browser/render_process_host.h"
  18 #include "jni/ContentViewStatics_jni.h"
  19
  20 using base::android::ConvertJavaStringToUTF16;
  21 using base::android::ConvertUTF16ToJavaString;
  22
  23 namespace {
  24
  25 // TODO(pliard): http://crbug.com/235909. Move WebKit shared timer toggling
  26 // functionality out of ContentViewStatistics and not be build on top of
  27 // blink::Platform::SuspendSharedTimer.
  28 // TODO(pliard): http://crbug.com/235912. Add unit tests for WebKit shared timer
  29 // toggling.
  30
  31 // This tracks the renderer processes that received a suspend request. It's
  32 // important on resume to only resume the renderer processes that were actually
  33 // suspended as opposed to all the current renderer processes because the
  34 // suspend calls are refcounted within WebKitPlatformSupport and it expects a
  35 // perfectly matched number of resume calls.
  36 // Note that this vector is only accessed from the UI thread.
  37 base::LazyInstance<std::vector<int /* process id */> > g_suspended_processes =
  38     LAZY_INSTANCE_INITIALIZER;
  39
  40 // Suspends timers in all current render processes.
  41 void SuspendWebKitSharedTimers(std::vector<int>* suspended_processes) {
  42   for (content::RenderProcessHost::iterator i(
  43           content::RenderProcessHost::AllHostsIterator());
  44        !i.IsAtEnd(); i.Advance()) {
  45     content::RenderProcessHost* host = i.GetCurrentValue();
  46     suspended_processes->push_back(host->GetID());
  47     host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(true));
  48   }
  49 }
  50
  51 // Resumes timers in processes that were previously stopped.
  52 void ResumeWebkitSharedTimers(const std::vector<int>& suspended_processes) {
  53   for (std::vector<int>::const_iterator it = suspended_processes.begin();
  54        it != suspended_processes.end(); ++it) {
  55     content::RenderProcessHost* host = content::RenderProcessHost::FromID(*it);
  56     if (host)  // The process might have been killed since it was suspended.
  57       host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(false));
  58   }
  59 }
  60
  61 }  // namespace
  62
  63 // Returns the first substring consisting of the address of a physical location.
  64 static jstring FindAddress(JNIEnv* env, jclass clazz, jstring addr) {
  65   base::string16 content_16 = ConvertJavaStringToUTF16(env, addr);
  66   base::string16 result_16;
  67   if (content::address_parser::FindAddress(content_16, &result_16))
  68     return ConvertUTF16ToJavaString(env, result_16).Release();
  69   return NULL;
  70 }
  71
  72 static void SetWebKitSharedTimersSuspended(JNIEnv* env,
  73                                            jclass obj,
  74                                            jboolean suspend) {
  75   std::vector<int>* suspended_processes = g_suspended_processes.Pointer();
  76   if (suspend) {
  77     DCHECK(suspended_processes->empty());
  78     SuspendWebKitSharedTimers(suspended_processes);
  79   } else {
  80     ResumeWebkitSharedTimers(*suspended_processes);
  81     suspended_processes->clear();
  82   }
  83 }
  84
  85 namespace content {
  86
  87 bool RegisterWebViewStatics(JNIEnv* env) {
  88   return RegisterNativesImpl(env) >= 0;
  89 }
  90
  91 }  // namespace content