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ASF GitHub Bot commented on CARBONDATA-297: ------------------------------------------- Github user ravipesala commented on a diff in the pull request: https://github.com/apache/incubator-carbondata/pull/229#discussion_r83130319 --- Diff: processing/src/main/java/org/apache/carbondata/processing/newflow/DataLoadProcessorStep.java --- @@ -0,0 +1,40 @@ +package org.apache.carbondata.processing.newflow; + +import java.util.Iterator; + +import org.apache.carbondata.processing.newflow.exception.CarbonDataLoadingException; + +/** + * This base interface for data loading. It can do transformation jobs as per the implementation. + * + */ +public interface DataLoadProcessorStep { + + /** + * The output meta for this step. The data returns from this step is as per this meta. + * @return + */ + DataField[] getOutput(); + + /** + * Intialization process for this step. + * @param configuration + * @param child + * @throws CarbonDataLoadingException + */ + void intialize(CarbonDataLoadConfiguration configuration, DataLoadProcessorStep child) throws + CarbonDataLoadingException; + + /** + * Tranform the data as per the implemetation. + * @return Iterator of data + * @throws CarbonDataLoadingException + */ + Iterator<Object[]> execute() throws CarbonDataLoadingException; + + /** + * Any closing of resources after step execution can be done here. + */ + void finish(); --- End diff -- It should be called in both failure and success cases. So i will rename it to `close` > 2. Add interfaces for data loading. > ----------------------------------- > > Key: CARBONDATA-297 > URL: https://issues.apache.org/jira/browse/CARBONDATA-297 > Project: CarbonData > Issue Type: Sub-task > Reporter: Ravindra Pesala > Assignee: Ravindra Pesala > Fix For: 0.2.0-incubating > > > Add the major interface classes for data loading so that the following jiras > can use this interfaces to implement it. -- This message was sent by Atlassian JIRA (v6.3.4#6332)