[TeX] Introduced Telemetry Express Logging APIs

- provided Java Counter metric logging API

Bug: 247803110
Test: m
Change-Id: Ib154f8fda2c136a62f4a90fb2b14b816233d3b47

core/java/com/android/internal/expresslog/Counter.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2022 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.internal.expresslog;
+
+import android.annotation.NonNull;
+
+import com.android.internal.util.FrameworkStatsLog;
+
+/** Counter encapsulates StatsD write API calls */
+public final class Counter {
+
+    // Not instantiable.
+    private Counter() {}
+
+    /**
+     * Increments Telemetry Express Counter metric by 1
+     * @hide
+     */
+    public static void logIncrement(@NonNull String metricId) {
+        logIncrement(metricId, 1);
+    }
+
+    /**
+     * Increments Telemetry Express Counter metric by arbitrary value
+     * @hide
+     */
+    public static void logIncrement(@NonNull String metricId, long amount) {
+        final long metricIdHash = hashString(metricId);
+        FrameworkStatsLog.write(FrameworkStatsLog.EXPRESS_EVENT_REPORTED, metricIdHash, amount);
+    }
+
+    private static native long hashString(String stringToHash);
+}

core/jni/Android.bp

@@ -34,6 +34,8 @@ cc_library_shared {
         "-Wno-error=deprecated-declarations",
         "-Wunused",
         "-Wunreachable-code",
+
+        "-DNAMESPACE_FOR_HASH_FUNCTIONS=farmhash",
     ],
 
     cppflags: ["-Wno-conversion-null"],
@@ -211,6 +213,7 @@ cc_library_shared {
                 "android_content_res_Configuration.cpp",
                 "android_security_Scrypt.cpp",
                 "com_android_internal_content_om_OverlayConfig.cpp",
+                "com_android_internal_expresslog_Counter.cpp",
                 "com_android_internal_net_NetworkUtilsInternal.cpp",
                 "com_android_internal_os_ClassLoaderFactory.cpp",
                 "com_android_internal_os_FuseAppLoop.cpp",
@@ -244,6 +247,7 @@ cc_library_shared {
                 "libscrypt_static",
                 "libstatssocket_lazy",
                 "libskia",
+                "libtextclassifier_hash_static",
             ],
 
             shared_libs: [
@@ -326,6 +330,7 @@ cc_library_shared {
             header_libs: [
                 "bionic_libc_platform_headers",
                 "dnsproxyd_protocol_headers",
+                "libtextclassifier_hash_headers",
             ],
         },
         host: {

core/jni/AndroidRuntime.cpp

@@ -193,6 +193,7 @@ extern int register_android_security_Scrypt(JNIEnv *env);
 extern int register_com_android_internal_content_F2fsUtils(JNIEnv* env);
 extern int register_com_android_internal_content_NativeLibraryHelper(JNIEnv *env);
 extern int register_com_android_internal_content_om_OverlayConfig(JNIEnv *env);
+extern int register_com_android_internal_expresslog_Counter(JNIEnv* env);
 extern int register_com_android_internal_net_NetworkUtilsInternal(JNIEnv* env);
 extern int register_com_android_internal_os_ClassLoaderFactory(JNIEnv* env);
 extern int register_com_android_internal_os_FuseAppLoop(JNIEnv* env);
@@ -1584,6 +1585,7 @@ static const RegJNIRec gRegJNI[] = {
         REG_JNI(register_android_os_SharedMemory),
         REG_JNI(register_android_os_incremental_IncrementalManager),
         REG_JNI(register_com_android_internal_content_om_OverlayConfig),
+        REG_JNI(register_com_android_internal_expresslog_Counter),
         REG_JNI(register_com_android_internal_net_NetworkUtilsInternal),
         REG_JNI(register_com_android_internal_os_ClassLoaderFactory),
         REG_JNI(register_com_android_internal_os_LongArrayMultiStateCounter),

core/jni/com_android_internal_expresslog_Counter.cpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#include <nativehelper/JNIHelp.h>
+#include <utils/hash/farmhash.h>
+
+#include "core_jni_helpers.h"
+
+// ----------------------------------------------------------------------------
+// JNI Glue
+// ----------------------------------------------------------------------------
+
+static jclass g_stringClass = nullptr;
+
+/**
+ * Class:     com_android_internal_expresslog_Counter
+ * Method:    hashString
+ * Signature: (Ljava/lang/String;)J
+ */
+static jlong hashString(JNIEnv* env, jclass /*class*/, jstring metricNameObj) {
+    ScopedUtfChars name(env, metricNameObj);
+    if (name.c_str() == nullptr) {
+        return 0;
+    }
+
+    return static_cast<jlong>(farmhash::Fingerprint64(name.c_str(), name.size()));
+}
+
+static const JNINativeMethod g_methods[] = {
+        {"hashString", "(Ljava/lang/String;)J", (void*)hashString},
+};
+
+static const char* const kCounterPathName = "com/android/internal/expresslog/Counter";
+
+namespace android {
+
+int register_com_android_internal_expresslog_Counter(JNIEnv* env) {
+    jclass stringClass = FindClassOrDie(env, "java/lang/String");
+    g_stringClass = MakeGlobalRefOrDie(env, stringClass);
+
+    return RegisterMethodsOrDie(env, kCounterPathName, g_methods, NELEM(g_methods));
+}
+
+} // namespace android