[GitHub] nwangtw commented on a change in pull request #3127: Add CumulativeCountMetric and metrics to monitor instance task

[GitBox <gi...@apache.org>]

nwangtw commented on a change in pull request #3127: Add CumulativeCountMetric and metrics to monitor instance task
URL: https://github.com/apache/incubator-heron/pull/3127#discussion_r243033799
 
 

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 File path: heron/common/src/java/org/apache/heron/common/utils/metrics/IBoltMetrics.java
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 @@ -0,0 +1,62 @@
+/**
+ * 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.heron.common.utils.metrics;
+
+import org.apache.heron.common.utils.misc.PhysicalPlanHelper;
+import org.apache.heron.common.utils.topology.TopologyContextImpl;
+
+/**
+ * Bolt's metrics to be collect
+ * We need to:
+ * 1. Define the metrics to be collected
+ * 2. New them in the constructor
+ * 3. Register them in registerMetrics(...) by using MetricsCollector's registerMetric(...)
+ * 4. Expose methods which could be called externally to change the value of metrics
+ */
+
+public interface IBoltMetrics extends ComponentMetrics {
 
 Review comment:
   That is what I thought. :D 
   
   But it turns out that FullSpoutMetrics is a re-implementation (focusing on accuracy and extra information) of SpoutMetrics and they are in parallel instead of parent-child.

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