1 files changed, 71 insertions, 6 deletions
diff --git a/java/com/android/dialer/metrics/StubMetrics.java b/java/com/android/dialer/metrics/StubMetrics.java
index 99c3d7691..ecd2382b9 100644
--- a/java/com/android/dialer/metrics/StubMetrics.java
+++ b/java/com/android/dialer/metrics/StubMetrics.java
@@ -16,26 +16,91 @@
 
 package com.android.dialer.metrics;
 
+import android.os.SystemClock;
+import com.android.dialer.common.Assert;
+import com.android.dialer.common.LogUtil;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
+import javax.inject.Singleton;
 
-/** Stub {@link Metrics}. */
+/** Stub {@link Metrics} which simply logs debug messages to logcat. */
+@ThreadSafe
+@Singleton
 public final class StubMetrics implements Metrics {
 
+  private final ConcurrentMap<String, StubTimerEvent> namedEvents = new ConcurrentHashMap<>();
+  private final ConcurrentMap<Integer, StubTimerEvent> unnamedEvents = new ConcurrentHashMap<>();
+
   @Inject
   StubMetrics() {}
 
   @Override
-  public void startTimer(String timerEventName) {}
+  public void startTimer(String timerEventName) {
+    namedEvents.put(timerEventName, new StubTimerEvent());
+  }
 
   @Override
-  public void stopTimer(String timerEventName) {}
+  public Integer startUnnamedTimer() {
+    StubTimerEvent stubTimerEvent = new StubTimerEvent();
+    int id = stubTimerEvent.hashCode();
+    LogUtil.d("StubMetrics.startUnnamedTimer", "started timer for id: %d", id);
+    unnamedEvents.put(id, stubTimerEvent);
+    return id;
+  }
 
   @Override
-  public void startJankRecorder(String eventName) {}
+  public void stopTimer(String timerEventName) {
+    StubTimerEvent stubTimerEvent = namedEvents.remove(timerEventName);
+    if (stubTimerEvent == null) {
+      return;
+    }
+
+    LogUtil.d(
+        "StubMetrics.stopTimer",
+        "%s took %dms",
+        timerEventName,
+        SystemClock.elapsedRealtime() - stubTimerEvent.startTime);
+  }
+
+  @Override
+  public void stopUnnamedTimer(int timerId, String timerEventName) {
+    long startTime =
+        Assert.isNotNull(
+                unnamedEvents.remove(timerId),
+                "no timer found for id: %d (%s)",
+                timerId,
+                timerEventName)
+            .startTime;
+
+    LogUtil.d(
+        "StubMetrics.stopUnnamedTimer",
+        "%s took %dms",
+        timerEventName,
+        SystemClock.elapsedRealtime() - startTime);
+  }
 
   @Override
-  public void stopJankRecorder(String eventName) {}
+  public void startJankRecorder(String eventName) {
+    LogUtil.d("StubMetrics.startJankRecorder", "started jank recorder for %s", eventName);
+  }
 
   @Override
-  public void recordMemory(String memoryEventName) {}
+  public void stopJankRecorder(String eventName) {
+    LogUtil.d("StubMetrics.startJankRecorder", "stopped jank recorder for %s", eventName);
+  }
+
+  @Override
+  public void recordMemory(String memoryEventName) {
+    LogUtil.d("StubMetrics.startJankRecorder", "recorded memory for %s", memoryEventName);
+  }
+
+  private static class StubTimerEvent {
+    final long startTime;
+
+    StubTimerEvent() {
+      this.startTime = SystemClock.elapsedRealtime();
+    }
+  }
 }