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https://issues.apache.org/jira/browse/FLINK-8558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538670#comment-16538670
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ASF GitHub Bot commented on FLINK-8558:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/6264#discussion_r201360640
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/formats/TableFormatFactoryService.scala
---
@@ -0,0 +1,245 @@
+/*
+ * 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 org.apache.flink.table.formats
+
+import java.util.{ServiceConfigurationError, ServiceLoader, Map => JMap}
+
+import org.apache.flink.table.api._
+import
org.apache.flink.table.descriptors.FormatDescriptorValidator.FORMAT_PROPERTY_VERSION
+import org.apache.flink.table.descriptors._
+import org.apache.flink.table.util.Logging
+
+import _root_.scala.collection.JavaConverters._
+import _root_.scala.collection.mutable
+
+/**
+ * Service provider interface for finding a suitable
[[TableFormatFactory]] for the
+ * given properties.
+ */
+object TableFormatFactoryService extends Logging {
+
+ private lazy val defaultLoader =
ServiceLoader.load(classOf[TableFormatFactory[_]])
+
+ /**
+ * Finds a table format factory of the given class and creates
configured instances from the
+ * given descriptor.
+ *
+ * @param factoryClass desired format factory
--- End diff --
As mentioned in the description of this PR, I wanted to make this whole
format discovery independent from particular interfaces. Maybe we will
introduce block-based writer/reader interfaces or async IO interfaces. This
should not require changes in the factory service anymore.
> 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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