chromeos: Block system suspend while uploading files to Drive

content/browser/power_save_blocker_win.cc

 // 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 "content/browser/power_save_blocker.h"
+#include "content/public/browser/power_save_blocker.h"
 
 #include <windows.h>
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/windows_version.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
@@ skipping 82 matching lines @@
 
   static DWORD flags = ES_CONTINUOUS;
   if (!g_blocker_count[type])
     flags &= ~this_flag;
   else
     flags |= this_flag;
 
   SetThreadExecutionState(flags);
 }
 
-}  // namespace.
+class PowerSaveBlockerWin : public PowerSaveBlocker {
+ public:
+  PowerSaveBlockerWin(PowerSaveBlockerType type, const std::string& reason);
+  virtual ~PowerSaveBlockerWin();
 
-class PowerSaveBlocker::Delegate
-    : public base::RefCountedThreadSafe<PowerSaveBlocker::Delegate> {
+ private:
+  class Delegate;
+
+  // A second object with different lifetime than the RAII container.

[jam, 2013/01/11 01:24:30]

why do this ref counted stuff in every implementation instead of making the base
interface be refcounted?

[hashimoto, 2013/01/11 08:39:44]

Introduced PowerSaveBlockerImpl to avoid code duplication between platforms.

[jam, 2013/01/11 17:28:38]

this is different than what i was wondering about. if the interface is
refcounted, you wouldn't need the Impl class or the Delegate inner class?

+  scoped_refptr<Delegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(PowerSaveBlockerWin);
+};
+
+class PowerSaveBlockerWin::Delegate
+    : public base::RefCountedThreadSafe<PowerSaveBlockerWin::Delegate> {
  public:
   Delegate(PowerSaveBlockerType type, const std::string& reason)
       : type_(type), reason_(reason) {}
 
   // Does the actual work to apply or remove the desired power save block.
   void ApplyBlock();
   void RemoveBlock();
 
   // Returns the equivalent POWER_REQUEST_TYPE for this request.
   POWER_REQUEST_TYPE RequestType();
 
  private:
   friend class base::RefCountedThreadSafe<Delegate>;
   ~Delegate() {}
 
   PowerSaveBlockerType type_;
   const std::string reason_;
   base::win::ScopedHandle handle_;
 
   DISALLOW_COPY_AND_ASSIGN(Delegate);
 };
 
-void PowerSaveBlocker::Delegate::ApplyBlock() {
+void PowerSaveBlockerWin::Delegate::ApplyBlock() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return ApplySimpleBlock(type_, 1);
 
   handle_.Set(CreatePowerRequest(RequestType(), reason_));
 }
 
-void PowerSaveBlocker::Delegate::RemoveBlock() {
+void PowerSaveBlockerWin::Delegate::RemoveBlock() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return ApplySimpleBlock(type_, -1);
 
   DeletePowerRequest(RequestType(), handle_.Take());
 }
 
-POWER_REQUEST_TYPE PowerSaveBlocker::Delegate::RequestType() {
+POWER_REQUEST_TYPE PowerSaveBlockerWin::Delegate::RequestType() {
   if (type_ == kPowerSaveBlockPreventDisplaySleep)
     return PowerRequestDisplayRequired;
 
   if (base::win::GetVersion() < base::win::VERSION_WIN8)
     return PowerRequestSystemRequired;
 
   return PowerRequestExecutionRequired;
 }
 
-PowerSaveBlocker::PowerSaveBlocker(PowerSaveBlockerType type,
-                                   const std::string& reason)
+PowerSaveBlockerWin::PowerSaveBlockerWin(PowerSaveBlockerType type,
+                                         const std::string& reason)
     : delegate_(new Delegate(type, reason)) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&Delegate::ApplyBlock, delegate_));
 }
 
-PowerSaveBlocker::~PowerSaveBlocker() {
+PowerSaveBlockerWin::~PowerSaveBlockerWin() {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&Delegate::RemoveBlock, delegate_));
 }
 
+}  // namespace
+
+// static
+scoped_ptr<PowerSaveBlocker> PowerSaveBlocker::Create(
+    PowerSaveBlockerType type,
+    const std::string& reason) {
+  return scoped_ptr<PowerSaveBlocker>(new PowerSaveBlockerWin(type, reason));
+}
+
 }  // namespace content