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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8558) Add unified format interfaces and format discovery
Date Sat, 14 Jul 2018 17:53:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16544289#comment-16544289
] 

ASF GitHub Bot commented on FLINK-8558:
---------------------------------------

Github user pnowojski commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6323#discussion_r202521122
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/factories/TableFactoryService.scala
---
    @@ -18,143 +18,358 @@
     
     package org.apache.flink.table.factories
     
    -import java.util.{ServiceConfigurationError, ServiceLoader}
    +import java.util.{ServiceConfigurationError, ServiceLoader, Map => JMap}
     
     import org.apache.flink.table.api._
     import org.apache.flink.table.descriptors.ConnectorDescriptorValidator._
     import org.apache.flink.table.descriptors.FormatDescriptorValidator._
     import org.apache.flink.table.descriptors.MetadataValidator._
     import org.apache.flink.table.descriptors.StatisticsValidator._
    -import org.apache.flink.table.descriptors.{DescriptorProperties, TableDescriptor, TableDescriptorValidator}
    +import org.apache.flink.table.descriptors._
     import org.apache.flink.table.util.Logging
    +import org.apache.flink.util.Preconditions
     
     import _root_.scala.collection.JavaConverters._
     import _root_.scala.collection.mutable
     
     /**
    -  * Unified interface to search for TableFactoryDiscoverable of provided type and properties.
    +  * Unified interface to search for a [[TableFactory]] of provided type and properties.
       */
     object TableFactoryService extends Logging {
     
       private lazy val defaultLoader = ServiceLoader.load(classOf[TableFactory])
     
    -  def find(clz: Class[_], descriptor: TableDescriptor): TableFactory = {
    -    find(clz, descriptor, null)
    +  /**
    +    * Finds a table factory of the given class and descriptor.
    +    *
    +    * @param factoryClass desired factory class
    +    * @param descriptor descriptor describing the factory configuration
    +    * @tparam T factory class type
    +    * @return the matching factory
    +    */
    +  def find[T](factoryClass: Class[T], descriptor: Descriptor): T = {
    +    Preconditions.checkNotNull(factoryClass)
    --- End diff --
    
    But this leads to quite some unnecessary code duplication. `checkNotNull(factoryClass)`
appears 5 times here and same applies to other params. Doing the check only in the place where
you are touching value would either solve or at least limit this issue.


> Add unified format interfaces and format discovery
> --------------------------------------------------
>
>                 Key: FLINK-8558
>                 URL: https://issues.apache.org/jira/browse/FLINK-8558
>             Project: Flink
>          Issue Type: New Feature
>          Components: Streaming Connectors
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>              Labels: pull-request-available
>
> In the last release, we introduced a new module {{flink-formats}}. Currently only {{flink-avro}}
is located there but we will add more formats such as {{flink-json}}, {{flink-protobuf}},
and so on. For better separation of concerns we want decouple connectors from formats: e.g.,
remove {{KafkaAvroTableSource}} and {{KafkaJsonTableSource}}.
> A newly introduced {{FormatFactory}} will use Java service loaders to discovery available
formats in the classpath (similar to how file systems are discovered now). A {{Format}} will
provide a method for converting {{byte[]}} to target record type.



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