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 "content/public/browser/render_process_host_observer.h"
  19 #include "jni/ContentViewStatics_jni.h"
  20
  21 using base::android::ConvertJavaStringToUTF16;
  22 using base::android::ConvertUTF16ToJavaString;
  23
  24 namespace {
  25
  26 // TODO(pliard): http://crbug.com/235909. Move WebKit shared timer toggling
  27 // functionality out of ContentViewStatistics and not be build on top of
  28 // blink::Platform::SuspendSharedTimer.
  29 // TODO(pliard): http://crbug.com/235912. Add unit tests for WebKit shared timer
  30 // toggling.
  31
  32 // This tracks the renderer processes that received a suspend request. It's
  33 // important on resume to only resume the renderer processes that were actually
  34 // suspended as opposed to all the current renderer processes because the
  35 // suspend calls are refcounted within BlinkPlatformImpl and it expects a
  36 // perfectly matched number of resume calls.
  37 // Note that this class is only accessed from the UI thread.
  38 class SuspendedProcessWatcher : public content::RenderProcessHostObserver {
  39  public:
  40
  41   // If the process crashes, stop watching the corresponding RenderProcessHost
  42   // and ensure it doesn't get over-resumed.
  43   void RenderProcessExited(content::RenderProcessHost* host,
  44                            base::TerminationStatus status,
  45                            int exit_code) override {
  46     StopWatching(host);
  47   }
  48
  49   void RenderProcessHostDestroyed(content::RenderProcessHost* host) override {
  50     StopWatching(host);
  51   }
  52
  53   // Suspends timers in all current render processes.
  54   void SuspendWebKitSharedTimers() {
  55     DCHECK(suspended_processes_.empty());
  56
  57     for (content::RenderProcessHost::iterator i(
  58             content::RenderProcessHost::AllHostsIterator());
  59          !i.IsAtEnd(); i.Advance()) {
  60       content::RenderProcessHost* host = i.GetCurrentValue();
  61       host->AddObserver(this);
  62       host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(true));
  63       suspended_processes_.push_back(host->GetID());
  64     }
  65   }
  66
  67   // Resumes timers in processes that were previously stopped.
  68   void ResumeWebkitSharedTimers() {
  69     for (std::vector<int>::const_iterator it = suspended_processes_.begin();
  70          it != suspended_processes_.end(); ++it) {
  71       content::RenderProcessHost* host =
  72           content::RenderProcessHost::FromID(*it);
  73       DCHECK(host);
  74       host->RemoveObserver(this);
  75       host->Send(new ViewMsg_SetWebKitSharedTimersSuspended(false));
  76     }
  77     suspended_processes_.clear();
  78   }
  79
  80  private:
  81   void StopWatching(content::RenderProcessHost* host) {
  82     std::vector<int>::iterator pos = std::find(suspended_processes_.begin(),
  83                                                suspended_processes_.end(),
  84                                                host->GetID());
  85     DCHECK(pos != suspended_processes_.end());
  86     host->RemoveObserver(this);
  87     suspended_processes_.erase(pos);
  88   }
  89
  90   std::vector<int /* RenderProcessHost id */> suspended_processes_;
  91 };
  92
  93 base::LazyInstance<SuspendedProcessWatcher> g_suspended_processes_watcher =
  94     LAZY_INSTANCE_INITIALIZER;
  95
  96 }  // namespace
  97
  98 // Returns the first substring consisting of the address of a physical location.
  99 static jstring FindAddress(JNIEnv* env, jclass clazz, jstring addr) {
 100   base::string16 content_16 = ConvertJavaStringToUTF16(env, addr);
 101   base::string16 result_16;
 102   if (content::address_parser::FindAddress(content_16, &result_16))
 103     return ConvertUTF16ToJavaString(env, result_16).Release();
 104   return NULL;
 105 }
 106
 107 static void SetWebKitSharedTimersSuspended(JNIEnv* env,
 108                                            jclass obj,
 109                                            jboolean suspend) {
 110   if (suspend) {
 111     g_suspended_processes_watcher.Pointer()->SuspendWebKitSharedTimers();
 112   } else {
 113     g_suspended_processes_watcher.Pointer()->ResumeWebkitSharedTimers();
 114   }
 115 }
 116
 117 namespace content {
 118
 119 bool RegisterWebViewStatics(JNIEnv* env) {
 120   return RegisterNativesImpl(env);
 121 }
 122
 123 }  // namespace content