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From bhupeshchawda <...@git.apache.org>
Subject [GitHub] apex-malhar pull request #282: APEXMALHAR-2066 JdbcPolling,idempotent,partit...
Date Tue, 07 Jun 2016 23:15:50 GMT
Github user bhupeshchawda commented on a diff in the pull request:

    https://github.com/apache/apex-malhar/pull/282#discussion_r66169324
  
    --- 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>
    +    implements ActivationListener<Context>, IdleTimeHandler, Partitioner<AbstractJdbcPollInputOperator<T>>
    +{
    +  /*
    +   * poll interval in milliseconds
    +   */
    +  private int pollInterval;
    +
    +  @Min(1)
    +  private int partitionCount = 1;
    +  protected transient int operatorId;
    +  protected transient boolean isReplayed;
    +  protected transient boolean isPollable;
    +  protected int batchSize;
    +  protected int fetchSize;
    +  /**
    +   * Map of windowId to <lower bound,upper bound> of the range key
    +   */
    +  protected transient MutablePair<String, String> currentWindowRecoveryState;
    +
    +  /**
    +   * size of the emit queue used to hold polled records before emit
    +   */
    +  private int queueCapacity = 4 * 1024 * 1024;
    +  private transient volatile boolean execute;
    +  private transient AtomicReference<Throwable> cause;
    +  protected transient int spinMillis;
    +  private transient OperatorContext context;
    +  protected String tableName;
    +  protected String key;
    +  protected long currentWindowId;
    +  protected KeyValPair<String, String> rangeQueryPair;
    +  protected String lower;
    +  protected String upper;
    +  protected boolean recovered;
    +  protected boolean isPolled;
    +  protected String whereCondition = null;
    --- End diff --
    
    Can you also clarify which subset of SQL will be supported here? How complex can the where
clause be?


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