lazyfighter commented on a change in pull request #370: [ISSUE #371]Develop Jdbc Source Connector URL: https://github.com/apache/rocketmq-externals/pull/370#discussion_r315528843
########## File path: rocketmq-connect-jdbc/src/main/java/org/apache/rocketmq/connect/jdbc/connector/JdbcSourceTask.java ########## @@ -0,0 +1,168 @@ + +/* + * 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.rocketmq.connect.jdbc.connector; + +import io.openmessaging.connector.api.source.SourceTask; + +import java.nio.ByteBuffer; +import java.sql.SQLException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Timer; +import java.util.TimerTask; +import java.util.concurrent.BlockingQueue; +import java.util.concurrent.LinkedBlockingQueue; +import java.util.concurrent.TimeUnit; + +import org.apache.rocketmq.connect.jdbc.Config; +import org.apache.rocketmq.connect.jdbc.schema.Table; +import org.apache.rocketmq.connect.jdbc.source.Querier; +import org.apache.rocketmq.connect.jdbc.source.TimestampIncrementingQuerier; +import org.apache.rocketmq.connect.jdbc.schema.column.*; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.alibaba.fastjson.JSON; + +import io.openmessaging.KeyValue; +import io.openmessaging.connector.api.data.EntryType; +import io.openmessaging.connector.api.data.Schema; +import io.openmessaging.connector.api.data.SourceDataEntry; + +import com.alibaba.fastjson.JSONObject; +import io.openmessaging.connector.api.data.DataEntryBuilder; +import io.openmessaging.connector.api.data.Field; + +public class JdbcSourceTask extends SourceTask { + + private static final Logger log = LoggerFactory.getLogger(JdbcSourceTask.class); + + private Config config; + + BlockingQueue<Querier> tableQueue = new LinkedBlockingQueue<Querier>(); + static final String INCREMENTING_FIELD = "incrementing"; + static final String TIMESTAMP_FIELD = "timestamp"; + private Querier querier; + + @Override + public Collection<SourceDataEntry> poll() { + List<SourceDataEntry> res = new ArrayList<>(); + try { + if (tableQueue.size() > 1) + querier = tableQueue.poll(1000, TimeUnit.MILLISECONDS); + else + querier = tableQueue.peek(); + Timer timer = new java.util.Timer(); + try { + Thread.currentThread(); + Thread.sleep(1000);//毫秒 + } catch (Exception e) { + throw e; + } + querier.poll(); + for (Table dataRow : querier.getList()) { + JSONObject jsonObject = new JSONObject(); + jsonObject.put("nextQuery", "database"); + jsonObject.put("nextPosition", "table"); + Schema schema = new Schema(); + schema.setDataSource(dataRow.getDatabase()); + schema.setName(dataRow.getName()); + schema.setFields(new ArrayList<>()); + for (int i = 0; i < dataRow.getColList().size(); i++) { + String columnName = dataRow.getColList().get(i); + String rawDataType = dataRow.getRawDataTypeList().get(i); + Field field = new Field(i, columnName, ColumnParser.mapConnectorFieldType(rawDataType)); + schema.getFields().add(field); + } + DataEntryBuilder dataEntryBuilder = new DataEntryBuilder(schema); + dataEntryBuilder.timestamp(System.currentTimeMillis()).queue(dataRow.getName()) + .entryType(EntryType.CREATE); + for (int i = 0; i < dataRow.getColList().size(); i++) { + Object value = dataRow.getDataList().get(i); + // System.out.println(dataRow.getColList().get(i) + "|" + value); + dataEntryBuilder.putFiled(dataRow.getColList().get(i), value); + } + + SourceDataEntry sourceDataEntry = dataEntryBuilder.buildSourceDataEntry( + ByteBuffer.wrap(config.jdbcUrl.getBytes("UTF-8")), + ByteBuffer.wrap(jsonObject.toJSONString().getBytes("UTF-8"))); + res.add(sourceDataEntry); + + } + } catch (Exception e) { + log.error("JDBC task poll error, current config:" + JSON.toJSONString(config), e); + } + log.info("dataEntry poll successfully,{}", res); + return res; + } + + @Override + public void start(KeyValue props) { + try { + config = new Config(); + config.load(props); + } catch (Exception e) { Review comment: maybe there no need catch exception, because `config.load()` already catch exception ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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