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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.
SuspendWebKitSharedTimers(std::vector<int> * suspended_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.
ResumeWebkitSharedTimers(const std::vector<int> & suspended_processes)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.
FindAddress(JNIEnv * env,jclass clazz,jstring addr)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 
SetWebKitSharedTimersSuspended(JNIEnv * env,jclass obj,jboolean suspend)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 
RegisterWebViewStatics(JNIEnv * env)87 bool RegisterWebViewStatics(JNIEnv* env) {
88   return RegisterNativesImpl(env) >= 0;
89 }
90 
91 }  // namespace content
92