Register NSD service from ConnectivityFrameworkInitializerTiramisu

INsdManager is going to move into connectivity mainline module
and it will be not visible to SystemServiceRegistry after
migration done. Thus, use ConnectivityFrameworkInitializerTiramisu
to register NSD service instead.

ConnectivityFrameworkInitializerTiramisu will be implemented in
the framework-connectivity-tiramisu bootclasspath JAR, which need
to be separated from the S+ framework-connectivity bootclasspath
JAR to be only loaded by the module on T+. So its methods cannot
be in the same class as ConnectivityFrameworkInitializer.

Bug: 206702844
Test: atest FrameworksNetTests CtsNetTestCases
Merged-In: Ibf89ab9a35e35dac4978ba70c7ab306b6155a4a3
Change-Id: Ibf89ab9a35e35dac4978ba70c7ab306b6155a4a3

framework-t/Sources.bp

@@ -102,13 +102,25 @@ filegroup {
 
 // Connectivity-T common libraries.
 
+filegroup {
+    name: "framework-connectivity-tiramisu-internal-sources",
+    srcs: [
+        "src/android/net/ConnectivityFrameworkInitializerTiramisu.java",
+    ],
+    path: "src",
+    visibility: [
+        "//visibility:private",
+    ],
+}
+
 filegroup {
     name: "framework-connectivity-tiramisu-sources",
     srcs: [
         ":framework-connectivity-netstats-sources",
         ":framework-connectivity-nsd-sources",
+        ":framework-connectivity-tiramisu-internal-sources",
     ],
     visibility: [
         "//frameworks/base",
     ],
-}
+}

framework-t/src/android/net/ConnectivityFrameworkInitializerTiramisu.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import android.annotation.SystemApi;
+import android.app.SystemServiceRegistry;
+import android.content.Context;
+import android.net.nsd.INsdManager;
+import android.net.nsd.NsdManager;
+
+/**
+ * Class for performing registration for Connectivity services which are exposed via updatable APIs
+ * since Android T.
+ *
+ * @hide
+ */
+@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
+public final class ConnectivityFrameworkInitializerTiramisu {
+    private ConnectivityFrameworkInitializerTiramisu() {}
+
+    /**
+     * Called by {@link SystemServiceRegistry}'s static initializer and registers nsd services to
+     * {@link Context}, so that {@link Context#getSystemService} can return them.
+     *
+     * @throws IllegalStateException if this is called anywhere besides
+     * {@link SystemServiceRegistry}.
+     */
+    public static void registerServiceWrappers() {
+        SystemServiceRegistry.registerContextAwareService(
+                Context.NSD_SERVICE,
+                NsdManager.class,
+                (context, serviceBinder) -> {
+                    INsdManager service = INsdManager.Stub.asInterface(serviceBinder);
+                    return new NsdManager(context, service);
+                }
+        );
+    }
+}