Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/6935#discussion_r47018518
--- Diff:
core/src/test/scala/org/apache/spark/deploy/history/ApplicationCacheSuite.scala
---
@@ -0,0 +1,460 @@
+/*
+ * 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.deploy.history
+
+import java.util.{Date, NoSuchElementException}
+
+import javax.servlet.Filter
+
+import scala.collection.mutable
+import scala.collection.mutable.ListBuffer
+import scala.language.postfixOps
+
+import com.codahale.metrics.Counter
+import com.google.common.cache.LoadingCache
+import com.google.common.util.concurrent.UncheckedExecutionException
+import org.eclipse.jetty.servlet.ServletContextHandler
+import org.mockito.Mockito._
+import org.scalatest.Matchers
+import org.scalatest.mock.MockitoSugar
+
+import org.apache.spark.status.api.v1.{ApplicationAttemptInfo =>
AttemptInfo, ApplicationInfo}
+import org.apache.spark.ui.SparkUI
+import org.apache.spark.util.{Clock, ManualClock, Utils}
+import org.apache.spark.{Logging, SparkFunSuite}
+
+class ApplicationCacheSuite extends SparkFunSuite with Logging with
MockitoSugar with Matchers {
+
+ /**
+ * subclass with access to the cache internals
+ * @param refreshInterval interval between refreshes in milliseconds.
+ * @param retainedApplications number of retained applications
+ */
+ class TestApplicationCache(
+ operations: ApplicationCacheOperations = new StubCacheOperations(),
+ refreshInterval: Long,
+ retainedApplications: Int,
+ clock: Clock = new ManualClock(0))
+ extends ApplicationCache(operations, refreshInterval,
retainedApplications, clock) {
+
+ def cache(): LoadingCache[CacheKey, CacheEntry] = appCache
+ }
+
+ /**
+ * cache operations
+ */
+ class StubCacheOperations extends ApplicationCacheOperations with
Logging {
--- End diff --
I should add that it can go the other way: whatever you subclass adds a new
field or mandatory interface method and your code doesn't compile. Either way,
you get to maintain things.
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