jiazhai commented on a change in pull request #2440: Issue 2313: create a JDBC 
sink connector
URL: https://github.com/apache/incubator-pulsar/pull/2440#discussion_r213150850
 
 

 ##########
 File path: 
pulsar-io/jdbc/src/main/java/org/apache/pulsar/io/jdbc/JdbcAbstractSink.java
 ##########
 @@ -0,0 +1,190 @@
+/**
+ * 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.pulsar.io.jdbc;
+
+import static 
jersey.repackaged.com.google.common.base.Preconditions.checkState;
+
+import com.google.common.collect.Lists;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.Statement;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.pulsar.functions.api.Record;
+import org.apache.pulsar.io.core.Sink;
+import org.apache.pulsar.io.core.SinkContext;
+
+/**
+ * A Simple abstract class for Jdbc sink
+ * Users need to implement extractKeyValue function to use this sink
+ */
+@Slf4j
+public abstract class JdbcAbstractSink<T> implements Sink<T> {
+    // ----- Runtime fields
+    private JdbcSinkConfig jdbcSinkConfig;
+    @Getter
+    private Connection connection;
+    private String tableName;
+
+    private JdbcUtils.TableId tableId;
+    private PreparedStatement insertStatement;
+
+    // TODO: turn to getSchema from 
SinkContext.getTopicSchema.getSchema(inputTopic)
+    protected String schema;
+    protected JdbcUtils.TableDefinition tableDefinition;
+
+    // for flush
+    private List<Record<T>> incomingList;
+    private List<Record<T>> swapList;
+    private AtomicBoolean isFlushing;
+    private int timeoutMs;
+    private int batchSize;
+    private ScheduledExecutorService flushExecutor;
+
+    @Override
+    public void open(Map<String, Object> config, SinkContext sinkContext) 
throws Exception {
+        jdbcSinkConfig = JdbcSinkConfig.load(config);
+
+        String jdbcUrl = jdbcSinkConfig.getJdbcUrl();
+        if (jdbcSinkConfig.getJdbcUrl() == null) {
+            throw new IllegalArgumentException("Required jdbc Url not set.");
+        }
+
+        Properties properties = new Properties();
+        String username = jdbcSinkConfig.getUserName();
+        String password = jdbcSinkConfig.getPassword();
+        if (username != null) {
+            properties.setProperty("user", username);
+        }
+        if (password != null) {
+            properties.setProperty("password", password);
+        }
+
+        connection = JdbcUtils.getConnection(jdbcUrl, properties);
+        log.info("Connection opened");
+
+        schema = jdbcSinkConfig.getSchema();
+        tableName = jdbcSinkConfig.getTableName();
+        tableId = JdbcUtils.getTableId(connection, tableName);
+        tableDefinition = JdbcUtils.getTableDefinition(connection, tableId);
+        insertStatement = JdbcUtils.buildInsertStatement(connection, 
JdbcUtils.buildInsertSql(tableDefinition));
+
+        timeoutMs = jdbcSinkConfig.getTimeoutMs();
+        batchSize = jdbcSinkConfig.getBatchSize();
+        incomingList = Lists.newArrayList();
+        swapList = Lists.newArrayList();
+        isFlushing = new AtomicBoolean(false);
+
+        flushExecutor = Executors.newScheduledThreadPool(1);
+        flushExecutor.scheduleAtFixedRate(() -> flush(), timeoutMs, timeoutMs, 
TimeUnit.MILLISECONDS);
+    }
+
+    @Override
+    public void close() throws Exception {
+        if (!connection.getAutoCommit()) {
+            connection.commit();
+        }
+        flushExecutor.shutdown();
+        if (connection != null) {
+            connection.close();
+        }
+        log.info("Connection Closed");
+    }
+
+    @Override
+    public void write(Record<T> record) throws Exception {
+        int number;
+        synchronized (incomingList) {
+            incomingList.add(record);
+            number = incomingList.size();
+        }
+
+        if (number == batchSize) {
+            flushExecutor.schedule(() -> flush(), 0, TimeUnit.MILLISECONDS);
+        }
+    }
+
+    // bind value with a PreparedStetement
+    public abstract void bindValue(
+        PreparedStatement statement,
+        Record<T> message) throws Exception;
+
+
+    private void flush() {
+        // if not in flushing state, do flush, else return;
+        if (isFlushing.compareAndSet(false, true)) {
+            log.debug("Starting flush, queue size: {}", incomingList.size());
+            checkState(swapList.isEmpty(),
+                "swapList should be empty since last flush. swapList.size: " + 
swapList.size());
+
+            synchronized (incomingList) {
+                List<Record<T>> tmpList;
+                swapList.clear();
+
+                tmpList = swapList;
+                swapList = incomingList;
+                incomingList = tmpList;
+            }
+
+            int updateCount = 0;
+            boolean noInfo = false;
+            try {
+                // bind each record value
+                for (Record<T> record : swapList) {
+                    bindValue(insertStatement, record);
+                    insertStatement.addBatch();
+                    record.ack();
+                }
+
+                for (int updates : insertStatement.executeBatch()) {
+                    if (updates == Statement.SUCCESS_NO_INFO) {
+                        noInfo = true;
+                        continue;
+                    }
+                    updateCount += updateCount;
+                }
+                if (!connection.getAutoCommit()) {
+                    connection.commit();
+                }
+            } catch (Exception e) {
+                log.error("Got exception ", e);
+                swapList.forEach(tRecord -> tRecord.fail());
+            }
+
+            if (swapList.size() != updateCount) {
+                log.error("Update count {}  not match total number of records 
{}", updateCount, swapList.size());
+            }
+
+            // finish flush
+            log.debug("Finish flush, queue size: {}", swapList.size());
+            isFlushing.set(false);
+        } else {
+            log.debug("Already in flushing state, will not flush, queue size: 
{}", incomingList.size());
 
 Review comment:
   Thanks, This is just to get info, in log, no operation on the list.

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