1 files changed, 27 insertions, 0 deletions
diff --git a/java/com/google/gerrit/metrics/CallbackMetric.java b/java/com/google/gerrit/metrics/CallbackMetric.java
new file mode 100644
index 0000000000..12646454d8
--- /dev/null
+++ b/java/com/google/gerrit/metrics/CallbackMetric.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 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.google.gerrit.metrics;
+
+import com.google.gerrit.extensions.registration.RegistrationHandle;
+
+/**
+ * Metric whose value is supplied when the trigger is invoked.
+ *
+ * @see CallbackMetric0
+ * @param <V> type of the metric value, typically Integer or Long.
+ */
+public interface CallbackMetric<V> extends RegistrationHandle {
+  void prune();
+}