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https://issues.apache.org/jira/browse/FLINK-8558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538683#comment-16538683
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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_r201364539
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/formats/utils/TestTableFormatFactory.scala
---
@@ -0,0 +1,60 @@
+/*
+ * 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.utils
+
+import java.util
+
+import org.apache.flink.api.common.serialization.DeserializationSchema
+import org.apache.flink.table.descriptors.{DescriptorProperties,
FormatDescriptorValidator, SchemaValidator}
+import org.apache.flink.table.formats.DeserializationSchemaFactory
+import org.apache.flink.types.Row
+
+/**
+ * Table format factory for testing.
+ */
+class TestTableFormatFactory extends DeserializationSchemaFactory[Row] {
+
+ override def requiredContext(): util.Map[String, String] = {
+ val context = new util.HashMap[String, String]()
+ context.put("format.type", "test-format")
--- End diff --
Generally, you are right. The problem of having a static variable
containing a property key is however that you can break backwards compatibility
and all tests automatically succeed because they all referenced the common
variable.
> 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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