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https://issues.apache.org/jira/browse/APEXMALHAR-2066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373332#comment-15373332
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ASF GitHub Bot commented on APEXMALHAR-2066:
--------------------------------------------
Github user devtagare commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/282#discussion_r70488149
--- Diff:
library/src/main/java/com/datatorrent/lib/db/jdbc/AbstractJdbcPollInputOperator.java
---
@@ -0,0 +1,652 @@
+/**
+ * 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 com.datatorrent.lib.db.jdbc;
+
+import java.io.IOException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.validation.constraints.Min;
+
+import org.slf4j.LoggerFactory;
+
+import org.apache.apex.malhar.lib.wal.FSWindowDataManager;
+import org.apache.apex.malhar.lib.wal.WindowDataManager;
+import org.apache.commons.lang3.tuple.MutablePair;
+
+import com.datatorrent.api.Context;
+import com.datatorrent.api.Context.OperatorContext;
+import com.datatorrent.api.DefaultPartition;
+import com.datatorrent.api.Operator.ActivationListener;
+import com.datatorrent.api.Operator.IdleTimeHandler;
+import com.datatorrent.api.Partitioner;
+import com.datatorrent.api.annotation.Stateless;
+import com.datatorrent.lib.db.AbstractStoreInputOperator;
+import com.datatorrent.lib.util.KeyValPair;
+import com.datatorrent.lib.util.KryoCloneUtils;
+import com.datatorrent.netlet.util.DTThrowable;
+
+/**
+ * Abstract operator for for consuming data using JDBC interface<br>
+ * User needs User needs to provide
+ * tableName,dbConnection,setEmitColumnList,look-up key <br>
+ * Optionally batchSize,pollInterval,Look-up key and a where clause can be
given
+ * <br>
+ * This operator uses static partitioning to arrive at range queries for
exactly
+ * once reads<br>
+ * Assumption is that there is an ordered column using which range queries
can
+ * be formed<br>
+ * If an emitColumnList is provided, please ensure that the keyColumn is
the
+ * first column in the list<br>
+ * Range queries are formed using the {@link JdbcMetaDataUtility}} Output -
+ * comma separated list of the emit columns eg columnA,columnB,columnC
+ *
+ * @displayName Jdbc Polling Input Operator
+ * @category Input
+ * @tags database, sql, jdbc, partitionable,exactlyOnce
+ */
+public abstract class AbstractJdbcPollInputOperator<T> extends
AbstractStoreInputOperator<T, JdbcStore>
--- End diff --
Done
> Add jdbc poller input operator
> ------------------------------
>
> Key: APEXMALHAR-2066
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2066
> Project: Apache Apex Malhar
> Issue Type: Task
> Reporter: Ashwin Chandra Putta
> Assignee: devendra tagare
>
> Create a JDBC poller input operator that has the following features.
> 1. poll from external jdbc store asynchronously in the input operator.
> 2. polling frequency and batch size should be configurable.
> 3. should be idempotent.
> 4. should be partition-able.
> 5. should be batch + polling capable.
> Assumptions for idempotency & partitioning,
> 1.User needs to provide tableName,dbConnection,setEmitColumnList,look-up key.
> 2.Optionally batchSize,pollInterval,Look-up key and a where clause can be
> given.
> 3.This operator uses static partitioning to arrive at range queries for
> exactly once reads
> 4.Assumption is that there is an ordered column using which range queries can
> be formed<br>
> 5.If an emitColumnList is provided, please ensure that the keyColumn is the
> first column in the list
> 6.Range queries are formed using the JdbcMetaDataUtility Output - comma
> separated list of the emit columns eg columnA,columnB,columnC
> Per window the first and the last key processed is saved using the
> FSWindowDataManager - (<lowerBound,UpperBound>,operatorId,windowId).This
> (lowerBound,upperBoundPair) is then used for recovery.The queries are
> constructed using the JDBCMetaDataUtility.
> JDBCMetaDataUtility
> A utility class used to retrieve the metadata for a given unique key of a SQL
> table. This class would emit range queries based on a primary index given.
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