Asynchronously open the temp file used for Pepper StreamToFile, and delete th...

chrome/browser/chrome_thread_relay.h

+// Copyright (c) 2010 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.
+
+// ChromeThreadRelay provides a convenient way to bounce work to a specific
+// ChromeThread and then return results back to the originating thread.
+//
+// EXAMPLE:
+//
+//  class MyRelay : public ChromeThreadRelay {
+//   public:
+//    MyRelay(const Params& params) : params_(params) {
+//    }
+//   protected:
+//    virtual void RunWork() {
+//      results_ = DoWork(params_);
+//    }
+//    virtual void RunCallback() {
+//      ... use results_ on the originating thread ...
+//    }
+//   private:
+//    Params params_;
+//    Results_ results_;
+//  };
+
+#ifndef CHROME_BROWSER_CHROME_THREAD_RELAY_H_
+#define CHROME_BROWSER_CHROME_THREAD_RELAY_H_
+
+#include "base/ref_counted.h"
+#include "chrome/browser/chrome_thread.h"
+
+class ChromeThreadRelay
+    : public base::RefCountedThreadSafe<ChromeThreadRelay> {
+ public:
+  ChromeThreadRelay();
+
+  void Start(ChromeThread::ID target_thread_id,
+             const tracked_objects::Location& from_here);
+
+ protected:
+  friend class base::RefCountedThreadSafe<ChromeThreadRelay>;
+  virtual ~ChromeThreadRelay() {}
+
+  // Called to perform work on the FILE thread.
+  virtual void RunWork() = 0;
+
+  // Called to notify the callback on the origin thread.
+  virtual void RunCallback() = 0;
+
+ private:
+  void ProcessOnTargetThread();
+  ChromeThread::ID origin_thread_id_;
+};
+
+#endif  // CHROME_BROWSER_CHROME_THREAD_RELAY_H_