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From DT-Priyanka <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: SPOI-7087 #resolve #comment Ad...
Date Tue, 23 Feb 2016 06:13:27 GMT
Github user DT-Priyanka commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/192#discussion_r53739919
  
    --- Diff: library/src/main/java/com/datatorrent/lib/db/jdbc/JDBCDimensionalOutputOperator.java
---
    @@ -0,0 +1,462 @@
    +/**
    + * 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.sql.PreparedStatement;
    +import java.sql.SQLException;
    +
    +import java.util.List;
    +import java.util.Map;
    +
    +import javax.validation.constraints.Min;
    +import javax.validation.constraints.NotNull;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.Lists;
    +import com.google.common.collect.Maps;
    +
    +import com.datatorrent.api.Context;
    +
    +import com.datatorrent.lib.appdata.gpo.GPOMutable;
    +import com.datatorrent.lib.appdata.schemas.DimensionalConfigurationSchema;
    +import com.datatorrent.lib.appdata.schemas.FieldsDescriptor;
    +import com.datatorrent.lib.appdata.schemas.Type;
    +import com.datatorrent.lib.db.AbstractPassThruTransactionableStoreOutputOperator;
    +import com.datatorrent.lib.dimensions.DimensionsDescriptor;
    +import com.datatorrent.lib.dimensions.DimensionsEvent.Aggregate;
    +import com.datatorrent.lib.dimensions.DimensionsEvent.EventKey;
    +import com.datatorrent.lib.dimensions.aggregator.AggregatorRegistry;
    +
    +import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
    +
    +/**
    + * This operator writes updates emitted by a {@link DimensionsStoreHDHT}
    + * operator to a Mysql database. Updates are written to the database in the
    + * following fashion: <br/>
    + * <br/>
    + * <ol>
    + * <li>Aggregates are received from an upstream
    + * {@link AbstractDimensionsComputationFlexibleSingleSchema} operator.</li>
    + * <li>Each aggregate is written to a different table based on its dimension
    + * combination, time bucket, and corresponding aggregation</li>
    + * </ol>
    + */
    +public class JDBCDimensionalOutputOperator
    +    extends AbstractPassThruTransactionableStoreOutputOperator<Aggregate, JdbcTransactionalStore>
    +{
    +  protected static int DEFAULT_BATCH_SIZE = 1000;
    +
    +  @Min(1)
    +  private int batchSize;
    +  private final List<Aggregate> tuples;
    +
    +  private transient int batchStartIdx;
    +
    +  @NotNull
    +  private Map<Integer, Map<String, String>> tableNames;
    +  @NotNull
    +  private String eventSchema;
    +  @NotNull
    +  private AggregatorRegistry aggregatorRegistry = AggregatorRegistry.DEFAULT_AGGREGATOR_REGISTRY;
    +  private DimensionalConfigurationSchema schema;
    +
    +  private transient Map<Integer, Map<Integer, PreparedStatement>> ddIDToAggIDToStatement
= Maps.newHashMap();
    +
    +  public JDBCDimensionalOutputOperator()
    +  {
    +    tuples = Lists.newArrayList();
    +    batchSize = DEFAULT_BATCH_SIZE;
    +    batchStartIdx = 0;
    +    store = new JdbcTransactionalStore();
    +  }
    +
    +  @Override
    +  public void setup(Context.OperatorContext context)
    +  {
    +    super.setup(context);
    +
    +    LOG.info("Done setting up super");
    +    aggregatorRegistry.setup();
    +
    +    //Create prepared statements
    +    schema = new DimensionalConfigurationSchema(eventSchema, aggregatorRegistry);
    +
    +    List<FieldsDescriptor> keyFDs = schema.getDimensionsDescriptorIDToKeyDescriptor();
    +
    +    for (int ddID = 0; ddID < keyFDs.size(); ddID++) {
    +
    +      LOG.info("ddID {}", ddID);
    +      FieldsDescriptor keyFD = keyFDs.get(ddID);
    +      Int2ObjectMap<FieldsDescriptor> aggIDToAggFD = schema
    +          .getDimensionsDescriptorIDToAggregatorIDToOutputAggregatorDescriptor().get(ddID);
    +
    +      Map<Integer, PreparedStatement> aggIDToStatement = ddIDToAggIDToStatement.get(ddID);
    +
    +      if (aggIDToStatement == null) {
    +        aggIDToStatement = Maps.newHashMap();
    +        ddIDToAggIDToStatement.put(ddID, aggIDToStatement);
    +      }
    +
    +      for (Map.Entry<String, String> aggTable : tableNames.get(ddID).entrySet())
{
    +        int aggID = aggregatorRegistry.getIncrementalAggregatorNameToID().get(aggTable.getKey());
    +
    +        LOG.info("aggID {}", aggID);
    +        FieldsDescriptor aggFD = aggIDToAggFD.get(aggID);
    +
    +        List<String> keyNames = keyFD.getFieldList();
    +        keyNames.remove(DimensionsDescriptor.DIMENSION_TIME_BUCKET);
    +
    +        LOG.info("List fields {}", keyNames);
    +        List<String> aggregateNames = aggFD.getFieldList();
    +        LOG.info("List fields {}", aggregateNames);
    +        String tableName = aggTable.getValue();
    +
    +        String statementString = buildStatement(tableName, keyNames, aggregateNames);
    +
    +        try {
    +          aggIDToStatement.put(aggID, store.getConnection().prepareStatement(statementString));
    +        } catch (SQLException ex) {
    +          throw new RuntimeException(ex);
    +        }
    +      }
    +    }
    +  }
    +
    +  private String buildStatement(String tableName, List<String> keyNames, List<String>
aggregateNames)
    +  {
    +    LOG.info("building statement");
    +    StringBuilder sb = new StringBuilder();
    +    sb.append("INSERT INTO ");
    +    sb.append(tableName);
    +    sb.append(" (");
    +
    +    addList(sb, keyNames);
    +    sb.append(",");
    +    addList(sb, aggregateNames);
    +
    +    sb.append(") VALUES (");
    +
    +    for (int qCounter = 0;; qCounter++) {
    +      sb.append("?");
    +
    +      if (qCounter == keyNames.size() + aggregateNames.size() - 1) {
    +        break;
    +      }
    +
    +      sb.append(",");
    +    }
    +
    +    sb.append(") ON DUPLICATE KEY UPDATE ");
    +
    +    addOnDuplicate(sb, aggregateNames);
    +
    +    return sb.toString();
    +  }
    +
    +  private void addOnDuplicate(StringBuilder sb, List<String> names)
    +  {
    +    LOG.info("add Duplicate");
    +    for (int index = 0;; index++) {
    +
    +      String name = names.get(index);
    +      sb.append(name);
    +      sb.append("=");
    +      sb.append("VALUES(");
    +      sb.append(name);
    +      sb.append(")");
    +
    +      if (index == names.size() - 1) {
    +        break;
    +      }
    +
    +      sb.append(",");
    +    }
    +  }
    +
    +  private void addList(StringBuilder sb, List<String> names)
    +  {
    +    for (int index = 0;; index++) {
    +      sb.append(names.get(index));
    +
    +      if (index == names.size() - 1) {
    +        break;
    +      }
    +
    +      sb.append(",");
    +    }
    +  }
    +
    +  /**
    +   * This sets the table names that corresponds to the dimensions combinations
    +   * specified in your {@link DimensionalConfigurationSchema}. The structure of
    +   * this property is as follows: <br/>
    +   * <br/>
    +   * <ol>
    +   * <li>The first key is the dimension combination id assigned to a dimension
    +   * combination in your {@link DimensionalConfigurationSchema}. <br/>
    +   * <br/>
    +   * The dimensions descriptor id is determined by the following factors:
    +   * <ul>
    +   * <li>The dimensions combination specified in the
    +   * {@link DimensionalConfigurationSchema}.</li>
    +   * <li>The the Time Buckets defined in your
    +   * {@link DimensionalConfigurationSchema}.</li>
    +   * </ul>
    +   * The dimensions descriptor id is computed in the following way:
    +   * <ol>
    +   * <li>The first dimensions descriptor id is 0</li>
    +   * <li>A dimension combination is selected</li>
    +   * <li>A time bucket is selected</li>
    +   * <li>The current dimension combination and time bucket pair is assigned a
    +   * dimensions descriptor id</li>
    +   * <li>The current dimensions descriptor id is incremented</li>
    +   * <li>Steps 3 - 5 are repeated until all the time buckets are done</li>
    +   * <li>Steps 2 - 6 are repeated until all the dimension combinations are done.
    +   * </li>
    +   * </ol>
    +   * <br/>
    +   * <</li>
    +   * <li>The second key is the name of an aggregation being performed for that
    +   * dimensions combination.</li>
    +   * <li>The value is the name of the output Mysql table</li>
    +   * </ol>
    +   * 
    +   * @param tableNames
    +   *          The table names that corresponds to the dimensions combinations
    +   *          specified in your {@link DimensionalConfigurationSchema}.
    +   */
    +  public void setTableNames(Map<Integer, Map<String, String>> tableNames)
    --- End diff --
    
    Why don't we have getters for this and other properties?


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