Github user bowenli86 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3736#discussion_r112340440
--- Diff:
flink-metrics/flink-metrics-datadog/src/main/java/org/apache/flink/metrics/datadog/DatadogHttpReporter.java
---
@@ -0,0 +1,214 @@
+/*
+ * 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.flink.metrics.datadog;
+
+import org.apache.flink.metrics.CharacterFilter;
+import org.apache.flink.metrics.Counter;
+import org.apache.flink.metrics.Gauge;
+import org.apache.flink.metrics.Meter;
+import org.apache.flink.metrics.Histogram;
+import org.apache.flink.metrics.Metric;
+import org.apache.flink.metrics.MetricConfig;
+import org.apache.flink.metrics.MetricGroup;
+import org.apache.flink.metrics.datadog.utils.SerializationUtils;
+import org.apache.flink.metrics.reporter.MetricReporter;
+import org.apache.flink.metrics.reporter.Scheduled;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+
+/**
+ * Metric Reporter for Datadog
+ *
+ * Variables in metrics scope will be sent to Datadog as tags
+ * */
+public class DatadogHttpReporter implements MetricReporter,
CharacterFilter, Scheduled {
+ private static final Logger LOGGER =
LoggerFactory.getLogger(DatadogHttpReporter.class);
+
+ // Both Flink's Gauge and Meter values are taken as gauge in Datadog
+ private final Map<Gauge, DGauge> gauges = new ConcurrentHashMap<>();
+ private final Map<Counter, DCounter> counters = new
ConcurrentHashMap<>();
+ private final Map<Meter, DMeter> meters = new ConcurrentHashMap<>();
+
+ private DatadogHttpClient client;
+ private List<String> configTags;
+
+ public static final String API_KEY = "apikey";
+ public static final String TAGS = "tags";
+
+ @Override
+ public void notifyOfAddedMetric(Metric metric, String metricName,
MetricGroup group) {
+ final String name = group.getMetricIdentifier(metricName, this);
+
+ List<String> tags = new ArrayList<>(configTags);
+ tags.addAll(getTagsFromMetricGroup(group));
+
+ synchronized (this) {
+ if (metric instanceof Counter) {
+ Counter c = (Counter) metric;
+ counters.put(c, new DCounter(c, name, tags));
+ } else if (metric instanceof Gauge) {
+ Gauge g = (Gauge) metric;
+ gauges.put(g, new DGauge(g, name, tags));
+ } else if(metric instanceof Meter) {
+ Meter m = (Meter) metric;
+ // Only consider rate
+ meters.put(m, new DMeter(m, name, tags));
+ } else if (metric instanceof Histogram) {
+ LOGGER.warn("Cannot add {} because Datadog HTTP
API doesn't support Histogram", metricName);
+ } else {
+ LOGGER.warn("Cannot add unknown metric type {}.
This indicates that the reporter " +
+ "does not support this metric type.",
metric.getClass().getName());
+ }
+ }
+ }
+
+ @Override
+ public void notifyOfRemovedMetric(Metric metric, String metricName,
MetricGroup group) {
+ synchronized (this) {
+ if (metric instanceof Counter) {
+ counters.remove(metric);
+ } else if (metric instanceof Gauge) {
+ gauges.remove(metric);
+ } else if (metric instanceof Meter) {
+ meters.remove(metric);
+ } else if (metric instanceof Histogram) {
+ // No Histogram and Meter metrics are registered
+ } else {
+ LOGGER.warn("Cannot remove unknown metric type
{}. This indicates that the reporter " +
+ "does not support this metric type.",
metric.getClass().getName());
+ }
+ }
+ }
+
+ @Override
+ public void open(MetricConfig config) {
+ client = new DatadogHttpClient(config.getString(API_KEY, null));
+ LOGGER.info("Configured DatadogHttpReporter");
+
+ configTags = getTagsFromConfig(config.getString(TAGS, null));
+ }
+
+ @Override
+ public void close() {
+ LOGGER.info("Shut down DatadogHttpReporter");
+ }
+
+ @Override
+ public void report() {
+ try {
+ DatadogHttpRequest request = new
DatadogHttpRequest(this);
+
+ for(DGauge g : gauges.values()) {
+ try {
+ // Will throw exception if the Gauge is
not of Number type
+ // Flink uses Gauge to store many types
other than Number
+ g.getMetricValue();
+ request.addGauge(g);
+ } catch (Exception e) {
+ // ignore if the Gauge is not of Number
type
+ }
+ }
+
+ for(DCounter c : counters.values()) {
--- End diff --
I'll fix them.
But, is it enforced programmatically? I didn't see any checkstyle errors
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