Support different types of MiddleManagers by Autoscaler apache#8695

 - Added Javadocs to the created classes

indexing-service/src/main/java/org/apache/druid/indexing/overlord/autoscaling/CategoriedProvisioningStrategy.java

@@ -59,6 +59,10 @@
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.stream.Collectors;
 
+/**
+ * Autoscaler provisioning strategy based on {@link AutoScaler#getCategory()} field. It selects autoscaler according
+ * to category of a submitted Task.
+ */
 @JsonTypeName("categoriedTaskBased")
 public class CategoriedProvisioningStrategy extends AbstractWorkerProvisioningStrategy
 {

indexing-service/src/main/java/org/apache/druid/indexing/overlord/setup/CategoriedWorkerBehaviorConfig.java

@@ -27,6 +27,9 @@
 import java.util.List;
 import java.util.Objects;
 
+/**
+ * This implementation is suitable for categoried provisioning strategies
+ */
 public class CategoriedWorkerBehaviorConfig implements WorkerBehaviorConfig
 {
   // Use the same category constant as for worker category to match default workers and autoscalers

indexing-service/src/main/java/org/apache/druid/indexing/overlord/setup/CategoriedWorkerSelectStrategy.java

@@ -19,6 +19,9 @@
 
 package org.apache.druid.indexing.overlord.setup;
 
+/**
+ * Extended version of WorkerSelectStrategy which is suitable for categoried strategies
+ */
 public interface CategoriedWorkerSelectStrategy extends WorkerSelectStrategy
 {
   WorkerCategorySpec getWorkerCategorySpec();

indexing-service/src/test/java/org/apache/druid/indexing/overlord/autoscaling/PendingTaskBasedProvisioningStrategyTestExtended.java

@@ -48,7 +48,9 @@
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.atomic.AtomicReference;
 
-
+/**
+ * More test cases for PendingTaskBasedProvisioningStrategy
+ */
 public class PendingTaskBasedProvisioningStrategyTestExtended
 {
   private static final String DEFAULT_CATEGORY_1 = "default_category1";

indexing-service/src/test/java/org/apache/druid/indexing/overlord/autoscaling/SimpleProvisioningStrategyTestExtended.java

@@ -49,7 +49,7 @@
 import java.util.concurrent.atomic.AtomicReference;
 
 /**
- *
+ * More test cases for SimpleProvisioningStrategy
  */
 public class SimpleProvisioningStrategyTestExtended
 {