Various improvements to the Chromoting Android app

remoting/client/jni/chromoting_jni.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_CLIENT_JNI_CHROMOTING_JNI_H_
-#define REMOTING_CLIENT_JNI_CHROMOTING_JNI_H_
-
-#include <jni.h>
-
-#include "base/at_exit.h"
-#include "net/url_request/url_request_context_getter.h"
-#include "remoting/base/auto_thread.h"
-#include "remoting/client/jni/chromoting_jni_instance.h"
-#include "remoting/protocol/connection_to_host.h"
-
-template<typename T> struct DefaultSingletonTraits;
-
-namespace remoting {
-
-// Houses the global resources on which the Chromoting components run
-// (e.g. message loops and task runners). Proxies outgoing JNI calls from its
-// ChromotingJniInstance member to Java. All its methods should be invoked
-// exclusively from the UI thread unless otherwise noted.
-class ChromotingJni {
- public:
-  // This class is instantiated at process initialization and persists until
-  // we close. Its components are reused across |ChromotingJniInstance|s.
-  static ChromotingJni* GetInstance();
-
-  scoped_refptr<AutoThreadTaskRunner> ui_task_runner() {
-    return ui_task_runner_;
-  }
-
-  scoped_refptr<AutoThreadTaskRunner> network_task_runner() {
-    return network_task_runner_;
-  }
-
-  scoped_refptr<AutoThreadTaskRunner> display_task_runner() {
-    return display_task_runner_;
-  }
-
-  scoped_refptr<net::URLRequestContextGetter> url_requester() {
-    return url_requester_;
-  }
-
-  // Initiates a connection with the specified host. Only call when a host
-  // connection is active (i.e. between a call to Connect() and the
-  // corresponding call to Disconnect()).
-  void ConnectToHost(const char* username,
-                     const char* auth_token,
-                     const char* host_jid,
-                     const char* host_id,
-                     const char* host_pubkey);
-
-  // Terminates any ongoing connection attempt and cleans up by nullifying
-  // |session_|. This is a no-op unless |session| is currently non-null.
-  void DisconnectFromHost();
-
-  // Returns the client for the currently-active session. Do not call if
-  // |session| is null.
-  scoped_refptr<ChromotingJniInstance> session() {
-    DCHECK(session_);
-    return session_;
-  }
-
-  // Notifies the user that the connection status has changed.
-  void ReportConnectionStatus(protocol::ConnectionToHost::State state,
-                              protocol::ErrorCode error);
-
-  // Pops up a dialog box asking the user to enter a PIN.
-  void DisplayAuthenticationPrompt();
-
-  // Updates image dimensions and canvas memory space. Call on display thread.
-  void UpdateImageBuffer(int width, int height, jobject buffer);
-
-  // Draws the latest image buffer onto the canvas. Call on the display thread.
-  void RedrawCanvas();
-
- private:
-  ChromotingJni();
-
-  // Forces a DisconnectFromHost() in case there is any active or failed
-  // connection, then proceeds to tear down the Chromium dependencies on which
-  // all sessions depended. Because destruction only occurs at application exit
-  // after all connections have terminated, it is safe to make unretained
-  // cross-thread calls on the class.
-  virtual ~ChromotingJni();
-
-  // Reference to the Java class into which we make JNI calls.
-  jclass class_;
-
-  // Used by the Chromium libraries to clean up the base and net libraries' JNI
-  // bindings. It must persist for the lifetime of the singleton.
-  scoped_ptr<base::AtExitManager> at_exit_manager_;
-
-  // Chromium code's connection to the Java message loop.
-  scoped_ptr<base::MessageLoopForUI> ui_loop_;
-
-  // References to native threads.
-  scoped_refptr<AutoThreadTaskRunner> ui_task_runner_;
-  scoped_refptr<AutoThreadTaskRunner> network_task_runner_;
-  scoped_refptr<AutoThreadTaskRunner> display_task_runner_;
-
-  scoped_refptr<net::URLRequestContextGetter> url_requester_;
-
-  // Contains all connection-specific state.
-  scoped_refptr<ChromotingJniInstance> session_;
-
-  friend struct DefaultSingletonTraits<ChromotingJni>;
-
-  DISALLOW_COPY_AND_ASSIGN(ChromotingJni);
-};
-
-}  // namespace remoting
-
-#endif