[GitHub] [zeppelin] alexott commented on a change in pull request #3640: [ZEPPELIN-4602] Added initial version of InfluxDB interpreter

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alexott commented on a change in pull request #3640: [ZEPPELIN-4602] Added initial version of InfluxDB interpreter
URL: https://github.com/apache/zeppelin/pull/3640#discussion_r410890756
 
 

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 File path: influxdb/src/main/java/org/apache/zeppelin/influxdb/InfluxDBInterpreter.java
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+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.zeppelin.influxdb;
+
+import java.util.Properties;
+import java.util.StringJoiner;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicReference;
+
+import com.influxdb.LogLevel;
+import com.influxdb.client.InfluxDBClient;
+import com.influxdb.client.InfluxDBClientFactory;
+import com.influxdb.client.InfluxDBClientOptions;
+import com.influxdb.client.QueryApi;
+import org.apache.zeppelin.interpreter.AbstractInterpreter;
+import org.apache.zeppelin.interpreter.ZeppelinContext;
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterException;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+
+/**
+ * <a href="https://v2.docs.influxdata.com/v2.0/">InfluxDB 2.0</a> interpreter for Zeppelin.
+ * It uses /v2/query API, query is written in Flux Language.
+ * <p>
+ * How to use: <br/>
+ * <pre>
+ * {@code
+ * %influxdb
+ * from(bucket: "my-bucket")
+ *   |> range(start: -5m)
+ *   |> filter(fn: (r) => r._measurement == "cpu")
+ *   |> filter(fn: (r) => r._field == "usage_user")
+ *   |> filter(fn: (r) => r.cpu == "cpu-total")
+ * }
+ * </pre>
+ * </p>
+ */
+public class InfluxDBInterpreter extends AbstractInterpreter {
+
+  static final String INFLUXDB_API_URL_PROPERTY = "influxdb.url";
+  static final String INFLUXDB_TOKEN_PROPERTY = "influxdb.token";
+  static final String INFLUXDB_ORG_PROPERTY = "influxdb.org";
+  private static final String INFLUXDB_LOGLEVEL_PROPERTY = "influxdb.logLevel";
+
+  private static final String TABLE_MAGIC_TAG = "%table ";
+  private static final String WHITESPACE = " ";
+  private static final String NEWLINE = "\n";
+  private static final String TAB = "\t";
+  static final String EMPTY_COLUMN_VALUE = "";
+
+  InfluxDBClient client;
+  QueryApi queryApi;
 
 Review comment:
   does it make sense to mark it as `volatile` ?

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