[Android Client] Move session-scoped native interface into JniClient

remoting/android/java/src/org/chromium/chromoting/jni/Client.java

 // Copyright 2015 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.
 
 package org.chromium.chromoting.jni;
 
 import android.graphics.Bitmap;
 import android.graphics.Point;
 import android.os.Looper;
 
 import org.chromium.base.Log;
+import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.chromoting.CapabilityManager;
 import org.chromium.chromoting.SessionAuthenticator;
 
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 
 /**
  * Class to manage a client connection to the host. This class controls the lifetime of the
@@ skipping 15 matching lines @@
     // Called on the UI thread.
     public Client() {
         if (sClient != null) {
             throw new RuntimeException("Client instance already created.");
         }
 
         sClient = this;
         mNativeJniClient = nativeInit();
     }
 
-    private native long nativeInit();
-
     // Called on the UI thread. Suppress FindBugs warning, since |sClient| is only used on the
     // UI thread.
     @SuppressFBWarnings("LI_LAZY_INIT_STATIC")
     public void destroy() {
         if (sClient != null) {
             disconnectFromHost();
             nativeDestroy(mNativeJniClient);
             sClient = null;
         }
     }
 
-    private native void nativeDestroy(long nativeJniClient);
-
     /** Returns the current Client instance, or null. */
     public static Client getInstance() {
         return sClient;
     }
 
     /** Used for authentication-related UX during connection. Accessed on the UI thread. */
     private SessionAuthenticator mAuthenticator;
 
     /** Whether the native code is attempting a connection. Accessed on the UI thread. */
     private boolean mConnected;
@@ skipping 32 matching lines @@
     }
 
     /** Attempts to form a connection to the user-selected host. Called on the UI thread. */
     public void connectToHost(String username, String authToken, String hostJid,
             String hostId, String hostPubkey, SessionAuthenticator authenticator, String flags,
             ConnectionListener listener) {
         disconnectFromHost();
 
         mConnectionListener = listener;
         mAuthenticator = authenticator;
-        JniInterface.nativeConnect(username, authToken, hostJid, hostId, hostPubkey,
+        nativeConnect(mNativeJniClient, username, authToken, hostJid, hostId, hostPubkey,
                 mAuthenticator.getPairingId(hostId), mAuthenticator.getPairingSecret(hostId),
                 mCapabilityManager.getLocalCapabilities(), flags);
         mConnected = true;
     }
 
     /** Severs the connection and cleans up. Called on the UI thread. */
     public void disconnectFromHost() {
         if (!mConnected) {
             return;
         }
 
         mConnectionListener.onConnectionState(
                 ConnectionListener.State.CLOSED, ConnectionListener.Error.OK);
 
         disconnectFromHostWithoutNotification();
     }
 
     /** Same as disconnectFromHost() but without notifying the ConnectionListener. */
     private void disconnectFromHostWithoutNotification() {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeDisconnect();
+        nativeDisconnect(mNativeJniClient);
         mConnectionListener = null;
         mConnected = false;
         mCapabilityManager.onHostDisconnect();
 
         // Drop the reference to free the Bitmap for GC.
         synchronized (mFrameLock) {
             mFrameBitmap = null;
         }
     }
 
-    /** Called by native code whenever the connection status changes. Called on the UI thread. */
+    /** Called on the UI thread whenever the connection status changes. */
+    @CalledByNative
     void onConnectionState(int stateCode, int errorCode) {
         ConnectionListener.State state = ConnectionListener.State.fromValue(stateCode);
         ConnectionListener.Error error = ConnectionListener.Error.fromValue(errorCode);
         mConnectionListener.onConnectionState(state, error);
         if (state == ConnectionListener.State.FAILED || state == ConnectionListener.State.CLOSED) {
             // Disconnect from the host here, otherwise the next time connectToHost() is called,
             // it will try to disconnect, triggering an incorrect status notification.
 
             // TODO(lambroslambrou): Connection state notifications for separate sessions should
             // go to separate Client instances. Once this is true, we can remove this line and
             // simplify the disconnectFromHost() code.
             disconnectFromHostWithoutNotification();
         }
     }
 
     /**
-     * Called by JniInterface (from native code) to prompt the user to enter a PIN. Called on the
-     * UI thread.
+     * Called on the UI thread to prompt the user to enter a PIN.
      */
+    @CalledByNative
     void displayAuthenticationPrompt(boolean pairingSupported) {
         mAuthenticator.displayAuthenticationPrompt(pairingSupported);
     }
 
     /**
      * Called by the SessionAuthenticator after the user enters a PIN.
      * @param pin The entered PIN.
      * @param createPair Whether to create a new pairing for this client.
      * @param deviceName The device name to appear in the pairing registry. Only used if createPair
      *                   is true.
      */
     public void handleAuthenticationResponse(
             String pin, boolean createPair, String deviceName) {
         assert mConnected;
-        JniInterface.nativeAuthenticationResponse(pin, createPair, deviceName);
+        nativeAuthenticationResponse(mNativeJniClient, pin, createPair, deviceName);
     }
 
     /**
-     * Called by JniInterface (from native code), to save newly-received pairing credentials to
-     * permanent storage. Called on the UI thread.
+     * Called on the UI thread to save newly-received pairing credentials to permanent storage.
      */
+    @CalledByNative
     void commitPairingCredentials(String host, String id, String secret) {
         mAuthenticator.commitPairingCredentials(host, id, secret);
     }
 
     /**
      * Moves the mouse cursor, possibly while clicking the specified (nonnegative) button. Called
      * on the UI thread.
      */
     public void sendMouseEvent(int x, int y, int whichButton, boolean buttonDown) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeSendMouseEvent(x, y, whichButton, buttonDown);
+        nativeSendMouseEvent(mNativeJniClient, x, y, whichButton, buttonDown);
     }
 
     /** Injects a mouse-wheel event with delta values. Called on the UI thread. */
     public void sendMouseWheelEvent(int deltaX, int deltaY) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeSendMouseWheelEvent(deltaX, deltaY);
+        nativeSendMouseWheelEvent(mNativeJniClient, deltaX, deltaY);
     }
 
     /**
      * Presses or releases the specified key. Called on the UI thread. If scanCode is not zero then
      * keyCode is ignored.
      */
     public boolean sendKeyEvent(int scanCode, int keyCode, boolean keyDown) {
         if (!mConnected) {
             return false;
         }
 
-        return JniInterface.nativeSendKeyEvent(scanCode, keyCode, keyDown);
+        return nativeSendKeyEvent(mNativeJniClient, scanCode, keyCode, keyDown);
     }
 
     /** Sends TextEvent to the host. Called on the UI thread. */
     public void sendTextEvent(String text) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeSendTextEvent(text);
+        nativeSendTextEvent(mNativeJniClient, text);
     }
 
     /** Sends an array of TouchEvents to the host. Called on the UI thread. */
     public void sendTouchEvent(TouchEventData.EventType eventType, TouchEventData[] data) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeSendTouchEvent(eventType.value(), data);
+        nativeSendTouchEvent(mNativeJniClient, eventType.value(), data);
     }
 
     /**
      * Enables or disables the video channel. Called on the UI thread in response to Activity
      * lifecycle events.
      */
     public void enableVideoChannel(boolean enable) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeEnableVideoChannel(enable);
+        nativeEnableVideoChannel(mNativeJniClient, enable);
     }
 
     /**
      * Sets the redraw callback to the provided functor. Provide a value of null whenever the
      * window is no longer visible so that we don't continue to draw onto it. Called on the UI
      * thread.
      */
     public void provideRedrawCallback(Runnable redrawCallback) {
         mRedrawCallback = redrawCallback;
     }
 
     /** Forces the native graphics thread to redraw to the canvas. Called on the UI thread. */
     public boolean redrawGraphics() {
         if (!mConnected || mRedrawCallback == null) return false;
 
-        JniInterface.nativeScheduleRedraw();
+        nativeScheduleRedraw(mNativeJniClient);
         return true;
     }
 
     /**
-     * Called by JniInterface to perform the redrawing callback requested by
+     * Called on the graphics thread to perform the redrawing callback requested by
      * {@link #redrawGraphics}. This is a no-op if the window isn't visible (the callback is null).
-     * Called on the graphics thread.
      */
+    @CalledByNative
     void redrawGraphicsInternal() {
         Runnable callback = mRedrawCallback;
         if (callback != null) {
             callback.run();
         }
     }
 
     /**
      * Returns a bitmap of the latest video frame. Called on the native graphics thread when
      * DesktopView is repainted.
      */
     public Bitmap getVideoFrame() {
         if (Looper.myLooper() == Looper.getMainLooper()) {
             Log.w(TAG, "Canvas being redrawn on UI thread");
         }
 
         synchronized (mFrameLock) {
             return mFrameBitmap;
         }
     }
 
     /**
-     * Called by JniInterface (from native code) to set a new video frame. Called on the native
-     * graphics thread when a new frame is allocated.
+     * Set a new video frame. Called on the native graphics thread when a new frame is allocated.
      */
+    @CalledByNative
     void setVideoFrame(Bitmap bitmap) {
         if (Looper.myLooper() == Looper.getMainLooper()) {
             Log.w(TAG, "Video frame updated on UI thread");
         }
 
         synchronized (mFrameLock) {
             mFrameBitmap = bitmap;
         }
     }
 
     /**
-     * Creates a new Bitmap to hold video frame pixels. Called by JniInterface (from native code),
-     * and the returned Bitmap is referenced by native code which writes the decoded frame pixels
-     * to it.
+     * Creates a new Bitmap to hold video frame pixels. The returned Bitmap is referenced by native
+     * code which writes the decoded frame pixels to it.
      */
+    @CalledByNative
     static Bitmap newBitmap(int width, int height) {
         return Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     }
 
     /**
-     * Called by JniInterface (from native code) to update the cursor shape. This is called on the
-     * graphics thread when receiving a new cursor shape from the host.
+     * Updates the cursor shape. This is called on the graphics thread when receiving a new cursor
+     * shape from the host.
      */
-    void updateCursorShape(
-            int width, int height, int hotspotX, int hotspotY, ByteBuffer buffer) {
+    @CalledByNative
+    void updateCursorShape(int width, int height, int hotspotX, int hotspotY, ByteBuffer buffer) {
         mCursorHotspot = new Point(hotspotX, hotspotY);
 
         int[] data = new int[width * height];
         buffer.order(ByteOrder.LITTLE_ENDIAN);
         buffer.asIntBuffer().get(data, 0, data.length);
         mCursorBitmap = Bitmap.createBitmap(data, width, height, Bitmap.Config.ARGB_8888);
     }
 
     /** Position of cursor hotspot within cursor image. Called on the graphics thread. */
     public Point getCursorHotspot() {
         return mCursorHotspot;
     }
 
     /** Returns the current cursor shape. Called on the graphics thread. */
     public Bitmap getCursorBitmap() {
         return mCursorBitmap;
     }
 
     //
     // Third Party Authentication
     //
 
     /**
-     * Called by JniInterface (from native code), to pop up a third party login page to fetch the
-     * token required for authentication.
+     * Pops up a third party login page to fetch the token required for authentication.
      */
+    @CalledByNative
     void fetchThirdPartyToken(String tokenUrl, String clientId, String scope) {
         mAuthenticator.fetchThirdPartyToken(tokenUrl, clientId, scope);
     }
 
     /**
      * Called by the SessionAuthenticator to pass the |token| and |sharedSecret| to native code to
      * continue authentication.
      */
     public void onThirdPartyTokenFetched(String token, String sharedSecret) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeOnThirdPartyTokenFetched(token, sharedSecret);
+        nativeOnThirdPartyTokenFetched(mNativeJniClient, token, sharedSecret);
     }
 
     //
     // Host and Client Capabilities
     //
 
     /**
-     * Called by JniInterface (from native code) to set the list of negotiated capabilities between
-     * host and client. Called on the UI thread.
+     * Sets the list of negotiated capabilities between host and client. Called on the UI thread.
      */
+    @CalledByNative
     void setCapabilities(String capabilities) {
         mCapabilityManager.setNegotiatedCapabilities(capabilities);
     }
 
     //
     // Extension Message Handling
     //
 
     /**
-     * Called by JniInterface (from native code), to pass on the deconstructed ExtensionMessage to
-     * the app. Called on the UI thread.
+     * Passes on the deconstructed ExtensionMessage to the app. Called on the UI thread.
      */
+    @CalledByNative
     void handleExtensionMessage(String type, String data) {
         mCapabilityManager.onExtensionMessage(type, data);
     }
 
     /** Sends an extension message to the Chromoting host. Called on the UI thread. */
     public void sendExtensionMessage(String type, String data) {
         if (!mConnected) {
             return;
         }
 
-        JniInterface.nativeSendExtensionMessage(type, data);
+        nativeSendExtensionMessage(mNativeJniClient, type, data);
     }
+
+    private native long nativeInit();
+
+    private native void nativeDestroy(long nativeJniClient);
+
+    /** Performs the native portion of the connection. */
+    private native void nativeConnect(long nativeJniClient, String username, String authToken,
+            String hostJid, String hostId, String hostPubkey, String pairId, String pairSecret,
+            String capabilities, String flags);
+
+    /** Native implementation of Client.handleAuthenticationResponse(). */
+    private native void nativeAuthenticationResponse(
+            long nativeJniClient, String pin, boolean createPair, String deviceName);
+
+    /** Performs the native portion of the cleanup. */
+    private native void nativeDisconnect(long nativeJniClient);
+
+    /** Schedules a redraw on the native graphics thread. */
+    private native void nativeScheduleRedraw(long nativeJniClient);
+
+    /** Passes authentication data to the native handling code. */
+    private native void nativeOnThirdPartyTokenFetched(
+            long nativeJniClient, String token, String sharedSecret);
+
+    /** Passes mouse information to the native handling code. */
+    private native void nativeSendMouseEvent(
+            long nativeJniClient, int x, int y, int whichButton, boolean buttonDown);
+
+    /** Passes mouse-wheel information to the native handling code. */
+    private native void nativeSendMouseWheelEvent(long nativeJniClient, int deltaX, int deltaY);
+
+    /** Passes key press information to the native handling code. */
+    private native boolean nativeSendKeyEvent(
+            long nativeJniClient, int scanCode, int keyCode, boolean keyDown);
+
+    /** Passes text event information to the native handling code. */
+    private native void nativeSendTextEvent(long nativeJniClient, String text);
+
+    /** Passes touch event information to the native handling code. */
+    private native void nativeSendTouchEvent(
+            long nativeJniClient, int eventType, TouchEventData[] data);
+
+    /** Native implementation of Client.enableVideoChannel() */
+    private native void nativeEnableVideoChannel(long nativeJniClient, boolean enable);
+
+    /** Passes extension message to the native code. */
+    private native void nativeSendExtensionMessage(long nativeJniClient, String type, String data);
 }