Github user pravsingh commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/582#discussion_r205902926
--- Diff: src/java/main/org/apache/zookeeper/metrics/Gauge.java ---
@@ -0,0 +1,35 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.zookeeper.metrics;
+
+/**
+ * A Gauge is an application provided object which will be called by the
framework in order to sample the value
+ * of an integer value.
+ */
+public interface Gauge {
+
+ /**
+ * Returns the current value associated with this gauge.
+ * The MetricsProvider will call this callback without taking care of
synchronization, it is up to the application
+ * to handle thread safety.
+ *
+ * @return the current value for the gauge
+ */
+ public long getCurrentValue();
--- End diff --
no public.
---
