Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/17107#discussion_r103576473
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/util/MockSourceProvider.scala
---
@@ -0,0 +1,84 @@
+/*
+ * 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.spark.sql.streaming.util
+
+import org.apache.spark.sql.SQLContext
+import org.apache.spark.sql.execution.streaming.Source
+import org.apache.spark.sql.sources.StreamSourceProvider
+import org.apache.spark.sql.types.{IntegerType, StructField, StructType}
+
+/**
+ * A StreamSourceProvider that provides mocked Sources for unit testing.
Example usage:
+ *
+ * {{{
+ * MockSourceProvider.withMockSources(source1, source2) {
+ * val df1 = spark.readStream
+ * .format("org.apache.spark.sql.streaming.util.MockSourceProvider")
+ * .load()
+ *
+ * val df2 = spark.readStream
+ * .format("org.apache.spark.sql.streaming.util.MockSourceProvider")
+ * .load()
+ *
+ * df1.union(df2)
+ * ...
+ * }
+ * }}}
+ */
+class MockSourceProvider extends StreamSourceProvider {
+ override def sourceSchema(
+ spark: SQLContext,
+ schema: Option[StructType],
+ providerName: String,
+ parameters: Map[String, String]): (String, StructType) = {
+ ("dummySource", MockSourceProvider.fakeSchema)
+ }
+
+ override def createSource(
+ spark: SQLContext,
+ metadataPath: String,
+ schema: Option[StructType],
+ providerName: String,
+ parameters: Map[String, String]): Source = {
+ MockSourceProvider.sourceProviderFunction()
+ }
+}
+
+object MockSourceProvider {
+ // Function to generate sources. May provide multiple sources if the
user implements such a
+ // function.
+ private var sourceProviderFunction: () => Source = _
+
+ final val fakeSchema = StructType(StructField("a", IntegerType) :: Nil)
+
+ def withMockSources(sources: Source*)(f: => Unit): Unit = {
+ require(sources.nonEmpty)
--- End diff --
nit: You can use `withMockSources(firstSource: Source, otherSources:
Source*)` to make it become a compile error.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
