Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/2203#discussion_r140968849
--- Diff:
storm-core/src/jvm/org/apache/storm/metrics2/StormMetricRegistry.java ---
@@ -0,0 +1,135 @@
+/**
+ * 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.storm.metrics2;
+
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.MetricRegistry;
+import org.apache.storm.Config;
+import org.apache.storm.cluster.DaemonType;
+import org.apache.storm.metrics2.reporters.StormReporter;
+import org.apache.storm.task.WorkerTopologyContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+
+public class StormMetricRegistry {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(StormMetricRegistry.class);
+
+ private static final MetricRegistry REGISTRY = new MetricRegistry();
+
+ private static final List<StormReporter> REPORTERS = new ArrayList<>();
+
+ private static String hostName = null;
+
+ public static <T> SimpleGauge<T> gauge(T initialValue, String name,
String topologyId, String componentId, Integer port){
+ SimpleGauge<T> gauge = new SimpleGauge<>(initialValue);
+ String metricName = metricName(name, topologyId, componentId,
port);
+ if(REGISTRY.getGauges().containsKey(metricName)){
--- End diff --
is it thread safe if multiple tasks try to register at the same time?
---
