Define ConnectivityDiagnosticsCallback IBinder impl.

An IBinder implementation of the ConnectivityDiagnosticsCallback AIDL is
needed so that apps can receive notfications with their registered
callbacks for callbacks coming from ConnectivityService.

Bug: 143187964
Bug: 147848028
Test: compiles
Test: atest FrameworksNetTests
Change-Id: Ie62678f794d81e1edee68977ec684a911b5070b7

core/java/android/net/ConnectivityDiagnosticsManager.java

@@ -21,6 +21,7 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.StringDef;
 import android.content.Context;
+import android.os.Binder;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.PersistableBundle;
@@ -544,6 +545,53 @@ public class ConnectivityDiagnosticsManager {
                 };
     }
 
+    /** @hide */
+    @VisibleForTesting
+    public static class ConnectivityDiagnosticsBinder
+            extends IConnectivityDiagnosticsCallback.Stub {
+        @NonNull private final ConnectivityDiagnosticsCallback mCb;
+        @NonNull private final Executor mExecutor;
+
+        /** @hide */
+        @VisibleForTesting
+        public ConnectivityDiagnosticsBinder(
+                @NonNull ConnectivityDiagnosticsCallback cb, @NonNull Executor executor) {
+            this.mCb = cb;
+            this.mExecutor = executor;
+        }
+
+        /** @hide */
+        @VisibleForTesting
+        public void onConnectivityReport(@NonNull ConnectivityReport report) {
+            Binder.withCleanCallingIdentity(() -> {
+                mExecutor.execute(() -> {
+                    mCb.onConnectivityReport(report);
+                });
+            });
+        }
+
+        /** @hide */
+        @VisibleForTesting
+        public void onDataStallSuspected(@NonNull DataStallReport report) {
+            Binder.withCleanCallingIdentity(() -> {
+                mExecutor.execute(() -> {
+                    mCb.onDataStallSuspected(report);
+                });
+            });
+        }
+
+        /** @hide */
+        @VisibleForTesting
+        public void onNetworkConnectivityReported(
+                @NonNull Network network, boolean hasConnectivity) {
+            Binder.withCleanCallingIdentity(() -> {
+                mExecutor.execute(() -> {
+                    mCb.onNetworkConnectivityReported(network, hasConnectivity);
+                });
+            });
+        }
+    }
+
     /**
      * Abstract base class for Connectivity Diagnostics callbacks. Used for notifications about
      * network connectivity events. Must be extended by applications wanting notifications.

tests/net/java/android/net/ConnectivityDiagnosticsManagerTest.java

@@ -16,6 +16,8 @@
 
 package android.net;
 
+import static android.net.ConnectivityDiagnosticsManager.ConnectivityDiagnosticsBinder;
+import static android.net.ConnectivityDiagnosticsManager.ConnectivityDiagnosticsCallback;
 import static android.net.ConnectivityDiagnosticsManager.ConnectivityReport;
 import static android.net.ConnectivityDiagnosticsManager.DataStallReport;
 
@@ -25,12 +27,19 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
 
 import android.os.PersistableBundle;
 
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
+import org.mockito.Mock;
+
+import java.util.concurrent.Executor;
 
 @RunWith(JUnit4.class)
 public class ConnectivityDiagnosticsManagerTest {
@@ -41,6 +50,19 @@ public class ConnectivityDiagnosticsManagerTest {
     private static final String BUNDLE_KEY = "key";
     private static final String BUNDLE_VALUE = "value";
 
+    private static final Executor INLINE_EXECUTOR = x -> x.run();
+
+    @Mock private ConnectivityDiagnosticsCallback mCb;
+
+    private ConnectivityDiagnosticsBinder mBinder;
+
+    @Before
+    public void setUp() {
+        mCb = mock(ConnectivityDiagnosticsCallback.class);
+
+        mBinder = new ConnectivityDiagnosticsBinder(mCb, INLINE_EXECUTOR);
+    }
+
     private ConnectivityReport createSampleConnectivityReport() {
         final LinkProperties linkProperties = new LinkProperties();
         linkProperties.setInterfaceName(INTERFACE_NAME);
@@ -193,4 +215,34 @@ public class ConnectivityDiagnosticsManagerTest {
     public void testDataStallReportParcelUnparcel() {
         assertParcelSane(createSampleDataStallReport(), 4);
     }
+
+    @Test
+    public void testConnectivityDiagnosticsCallbackOnConnectivityReport() {
+        mBinder.onConnectivityReport(createSampleConnectivityReport());
+
+        // The callback will be invoked synchronously by inline executor. Immediately check the
+        // latch without waiting.
+        verify(mCb).onConnectivityReport(eq(createSampleConnectivityReport()));
+    }
+
+    @Test
+    public void testConnectivityDiagnosticsCallbackOnDataStallSuspected() {
+        mBinder.onDataStallSuspected(createSampleDataStallReport());
+
+        // The callback will be invoked synchronously by inline executor. Immediately check the
+        // latch without waiting.
+        verify(mCb).onDataStallSuspected(eq(createSampleDataStallReport()));
+    }
+
+    @Test
+    public void testConnectivityDiagnosticsCallbackOnNetworkConnectivityReported() {
+        final Network n = new Network(NET_ID);
+        final boolean connectivity = true;
+
+        mBinder.onNetworkConnectivityReported(n, connectivity);
+
+        // The callback will be invoked synchronously by inline executor. Immediately check the
+        // latch without waiting.
+        verify(mCb).onNetworkConnectivityReported(eq(n), eq(connectivity));
+    }
 }