WeiZhong94 commented on a change in pull request #817: [IOTDB-497] Apache Flink Connector Support URL: https://github.com/apache/incubator-iotdb/pull/817#discussion_r388926286
########## File path: flink-iotdb-connector/src/main/java/org/apache/iotdb/flink/IoTDBSink.java ########## @@ -0,0 +1,188 @@ +/* + * 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.iotdb.flink; + +import com.google.common.base.Preconditions; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.streaming.api.functions.sink.RichSinkFunction; +import org.apache.iotdb.service.rpc.thrift.TSStatus; +import org.apache.iotdb.session.Session; +import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.*; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; + +/** + * The `IoTDBSink` allows flink jobs to write events into IoTDB timeseries. + * By default send only one event after another, but you can change to batch by invoking `withBatchSize(int)`. + * @param <IN> the input data type + */ +public class IoTDBSink<IN> extends RichSinkFunction<IN> { + + private static final long serialVersionUID = 1L; + private static final Logger LOG = LoggerFactory.getLogger(IoTDBSink.class); + + private IoTDBOptions options; + private IoTSerializationSchema<IN> serializationSchema; + private Map<String, IoTDBOptions.TimeseriesOption> timeseriesOptionMap; + private transient Session session; + private transient ScheduledExecutorService scheduledExecutor; + + private int batchSize = 0; + private int flushIntervalMs = 3000; + private List<Event> batchList; + + public IoTDBSink(IoTDBOptions options, IoTSerializationSchema<IN> schema) { + this.options = options; + this.serializationSchema = schema; + this.batchList = new LinkedList<>(); + this.timeseriesOptionMap = new HashMap<>(); + for (IoTDBOptions.TimeseriesOption timeseriesOption : options.getTimeseriesOptionList()) { + timeseriesOptionMap.put(timeseriesOption.getPath(), timeseriesOption); + } + } + + @Override + public void open(Configuration parameters) throws Exception { + initSession(); + initScheduler(); + } + + void initSession() throws Exception { + session = new Session(options.getHost(), options.getPort(), options.getUser(), options.getPassword()); + session.open(); + + session.setStorageGroup(options.getStorageGroup()); + for (IoTDBOptions.TimeseriesOption option : options.getTimeseriesOptionList()) { + if (!session.checkTimeseriesExists(option.getPath())) { + session.createTimeseries(option.getPath(), option.getDataType(), option.getEncoding(), option.getCompressor()); + } + } + } + + void initScheduler() { + if (batchSize > 0) { + scheduledExecutor = Executors.newSingleThreadScheduledExecutor(); + scheduledExecutor.scheduleAtFixedRate(() -> { + try { + flush(); + } catch (Exception e) { + LOG.error("flush error", e); + } + }, flushIntervalMs, flushIntervalMs, TimeUnit.MILLISECONDS); + } + } + + // for testing + void setSession(Session session) { + this.session = session; + } + + @Override + public void invoke(IN input, Context context) throws Exception { + Event event = serializationSchema.serialize(input); + if (event == null) { + return; + } + + if (batchSize > 0) { + synchronized (batchList) { + batchList.add(event); + if (batchList.size() >= batchSize) { + flush(); + } + return; + } + } + + convertText(event.getDevice(), event.getMeasurements(), event.getValues()); + TSStatus status = session.insert(event.getDevice(), event.getTimestamp(), + event.getMeasurements(), event.getValues()); + LOG.debug("send event result: {}", status); + } + + public IoTDBSink<IN> withBatchSize(int batchSize) { + Preconditions.checkArgument(batchSize >= 0); + this.batchSize = batchSize; + return this; + } + + public IoTDBSink<IN> withFlushIntervalMs(int flushIntervalMs) { + Preconditions.checkArgument(flushIntervalMs > 0); + this.flushIntervalMs = flushIntervalMs; + return this; + } + + @Override + public void close() throws Exception { + if (session != null) { + try { + flush(); + } catch (Exception e) { + LOG.error("flush error", e); + } + session.close(); + } + if (scheduledExecutor != null) { + scheduledExecutor.shutdown(); + } + } + + private void convertText(String device, List<String> measurements, List<String> values) { + if (device != null && measurements != null && values != null && measurements.size() == values.size()) { + for (int i = 0; i < measurements.size(); i++) { + String measurement = device + "." + measurements.get(i); + IoTDBOptions.TimeseriesOption timeseriesOption = timeseriesOptionMap.get(measurement); + if (timeseriesOption!= null && TSDataType.TEXT.equals(timeseriesOption.getDataType())) { + // The TEXT data type should be covered by " or ' + values.set(i, "'" + values.get(i) + "'"); + } + } + } + } + + private void flush() throws Exception { + if (batchSize > 0) { + synchronized (batchList) { + if (batchList.size() > 0) { + List<String> deviceIds = new ArrayList<>(); + List<Long> timestamps = new ArrayList<>(); + List<List<String>> measurementsList = new ArrayList<>(); + List<List<String>> valuesList = new ArrayList<>(); + + for (Event event : batchList) { + convertText(event.getDevice(), event.getMeasurements(), event.getValues()); + deviceIds.add(event.getDevice()); + timestamps.add(event.getTimestamp()); + measurementsList.add(event.getMeasurements()); + valuesList.add(event.getValues()); + } + List<TSStatus> statusList = session.insertInBatch(deviceIds, timestamps, measurementsList, valuesList); + LOG.debug("send events result: {}", statusList); + batchList.clear(); + } + } + } + } + Review comment: Unnecessary empty line. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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