Linux pairing registry delegate implementation

remoting/protocol/pairing_registry.h

 // Copyright 2013 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.
 
 #ifndef REMOTING_PROTOCOL_PAIRING_REGISTRY_H_
 #define REMOTING_PROTOCOL_PAIRING_REGISTRY_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time.h"
 
+namespace base {
+class TaskRunner;
+}  // namespace base
+
 namespace remoting {
 namespace protocol {
 
 // TODO(jamiewalch): This class is little more than a wrapper around the
 // Pairing and Delegate classes. Refactor it away.
 
 // PairingRegistry holds information about paired clients to support
 // PIN-less authentication. For each paired client, the registry holds
 // the following information:
 //   * The name of the client. This is supplied by the client and is not
@@ skipping 54 matching lines @@
                             const AddPairingCallback& callback) = 0;
 
     // Retrieve the Pairing for the specified client id. If none is found,
     // invoke the callback with a default pairing. Must not block.
     virtual void GetPairing(const std::string& client_id,
                             const GetPairingCallback& callback) = 0;
   };
 
   explicit PairingRegistry(scoped_ptr<Delegate> delegate);
 
-  // Create a pairing for a new client and save it to disk.
+  // Creates a pairing for a new client and saves it to disk.
   Pairing CreatePairing(const std::string& client_name);
 
-  // Get the pairing for the specified client id. See the corresponding
+  // Gets the pairing for the specified client id. See the corresponding
   // Delegate method for details.
   void GetPairing(const std::string& client_id,
                   const GetPairingCallback& callback);
 
+  // Returns a platform-specific Delegate that will save to permanent storage
+  // using the specified TaskRunner. Returns NULL on platforms that don't
+  // support pairing.
+  static scoped_ptr<Delegate> CreateDelegate(
+      scoped_refptr<base::TaskRunner> task_runner);
+
  private:
   friend class base::RefCountedThreadSafe<PairingRegistry>;
 
   virtual ~PairingRegistry();
 
   scoped_ptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PairingRegistry);
 };
 
-// Temporary delegate that just logs NOTIMPLEMENTED for Load/Save.
-// TODO(jamiewalch): Delete once Delegates are implemented for all platforms.
-class NotImplementedPairingRegistryDelegate : public PairingRegistry::Delegate {
- public:
-  virtual void AddPairing(
-      const PairingRegistry::Pairing& paired_clients,
-      const PairingRegistry::AddPairingCallback& callback) OVERRIDE;
-  virtual void GetPairing(
-      const std::string& client_id,
-      const PairingRegistry::GetPairingCallback& callback) OVERRIDE;
-};
-
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_PAIRING_REGISTRY_H_