Add NetworkNsdReportedMetrics

Add helper class NetworkNsdReportedMetrics to build and report
nsd metrics data.

Bug: 287546772
Test: m
Change-Id: I8271811c52a88329fd54e8e0f6cc455d3a3d22f7

service-t/src/com/android/metrics/NetworkNsdReportedMetrics.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2023 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 com.android.metrics;
+
+/**
+ * Class to record the NetworkNsdReported into statsd. Each client should create this class to
+ * report its data.
+ */
+public class NetworkNsdReportedMetrics {
+    // Whether this client is using legacy backend.
+    private final boolean mIsLegacy;
+    // The client id.
+    private final int mClientId;
+
+    public NetworkNsdReportedMetrics(boolean isLegacy, int clientId) {
+        mIsLegacy = isLegacy;
+        mClientId = clientId;
+    }
+
+    // TODO: Report metrics data.
+}

service-t/src/com/android/server/NsdService.java

@@ -26,6 +26,7 @@ import static android.provider.DeviceConfig.NAMESPACE_TETHERING;
 
 import static com.android.modules.utils.build.SdkLevel.isAtLeastU;
 import static com.android.server.connectivity.mdns.MdnsRecord.MAX_LABEL_LENGTH;
+import static com.android.server.connectivity.mdns.util.MdnsUtils.Clock;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -68,6 +69,7 @@ import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.IndentingPrintWriter;
 import com.android.internal.util.State;
 import com.android.internal.util.StateMachine;
+import com.android.metrics.NetworkNsdReportedMetrics;
 import com.android.net.module.util.CollectionUtils;
 import com.android.net.module.util.DeviceConfigUtils;
 import com.android.net.module.util.InetAddressUtils;
@@ -528,8 +530,10 @@ public class NsdService extends INsdManager.Stub {
                         try {
                             cb.asBinder().linkToDeath(arg.connector, 0);
                             final String tag = "Client" + arg.uid + "-" + mClientNumberId++;
+                            final NetworkNsdReportedMetrics metrics = new NetworkNsdReportedMetrics(
+                                    !arg.useJavaBackend, (int) new Clock().elapsedRealtime());
                             cInfo = new ClientInfo(cb, arg.uid, arg.useJavaBackend,
-                                    mServiceLogs.forSubComponent(tag));
+                                    mServiceLogs.forSubComponent(tag), metrics);
                             mClients.put(arg.connector, cInfo);
                         } catch (RemoteException e) {
                             Log.w(TAG, "Client request id " + clientRequestId
@@ -2087,14 +2091,17 @@ public class NsdService extends INsdManager.Stub {
         private final boolean mUseJavaBackend;
         // Store client logs
         private final SharedLog mClientLogs;
+        // Report the nsd metrics data
+        private final NetworkNsdReportedMetrics mMetrics;
 
         private ClientInfo(INsdManagerCallback cb, int uid, boolean useJavaBackend,
-                SharedLog sharedLog) {
+                SharedLog sharedLog, NetworkNsdReportedMetrics metrics) {
             mCb = cb;
             mUid = uid;
             mUseJavaBackend = useJavaBackend;
             mClientLogs = sharedLog;
             mClientLogs.log("New client. useJavaBackend=" + useJavaBackend);
+            mMetrics = metrics;
         }
 
         @Override