Add MetricsUtil

service/src/main/java/org/whispersystems/textsecuregcm/metrics/MetricsUtil.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2021 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.metrics;
+
+public class MetricsUtil {
+
+  private static final String PREFIX = "chat";
+
+  /**
+   * Returns a dot-separated ('.') name for the given class and name parts
+   */
+  public static String name(Class<?> clazz, String... parts) {
+    return name(clazz.getSimpleName(), parts);
+  }
+
+  private static String name(String name, String... parts) {
+    final StringBuilder sb = new StringBuilder(PREFIX);
+    sb.append(".").append(name);
+    for (String part : parts) {
+      sb.append(".").append(part);
+    }
+    return sb.toString();
+  }
+
+}

service/src/test/java/org/whispersystems/textsecuregcm/metrics/MetricsUtilTest.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2021 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.metrics;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+
+class MetricsUtilTest {
+
+  @Test
+  void name() {
+
+    assertEquals("chat.MetricsUtilTest.metric", MetricsUtil.name(MetricsUtilTest.class, "metric"));
+    assertEquals("chat.MetricsUtilTest.namespace.metric",
+        MetricsUtil.name(MetricsUtilTest.class, "namespace", "metric"));
+  }
+}