Copy only req extra files if using compiled rules

.changes/next-release/feature-AWSSDKforJavav2-0b9a472.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "Don't generate the unused files for the service endpoint provider when compiled endpoint rules are enabled (the default behavior). This lowers the overall size of the built JAR."
+}

codegen/src/main/java/software/amazon/awssdk/codegen/emitters/tasks/EndpointProviderTasks.java

@@ -53,7 +53,7 @@ protected List<GeneratorTask> createTasks() throws Exception {
         tasks.add(generateParams());
         if (shouldGenerateCompiledEndpointRules()) {
             tasks.add(generateDefaultProvider2());
-            tasks.add(new RulesEngineRuntimeGeneratorTask(generatorTaskParams));
+            tasks.add(new RulesEngineRuntimeLiteGeneratorTask(generatorTaskParams));
             tasks.add(new RulesEngineRuntimeGeneratorTask2(generatorTaskParams));
         } else {
             tasks.add(generateDefaultProvider());

codegen/src/main/java/software/amazon/awssdk/codegen/emitters/tasks/RulesEngineRuntimeGeneratorTask.java

@@ -30,7 +30,7 @@
 import software.amazon.awssdk.utils.StringUtils;
 import software.amazon.awssdk.utils.Validate;
 
-public final class RulesEngineRuntimeGeneratorTask extends BaseGeneratorTasks {
+public class RulesEngineRuntimeGeneratorTask extends BaseGeneratorTasks {
     public static final String RUNTIME_CLASS_NAME = "WaitersRuntime";
 
     private final String engineInternalClassDir;
@@ -63,7 +63,7 @@ protected List<GeneratorTask> createTasks() throws Exception {
         return copyTasks;
     }
 
-    private List<String> rulesEngineJavaFilePaths(Collection<String> runtimeEngineFiles) {
+    protected List<String> rulesEngineJavaFilePaths(Collection<String> runtimeEngineFiles) {
         return runtimeEngineFiles.stream()
                                  .filter(e -> e.endsWith(".java.resource"))
                                  .collect(Collectors.toList());

codegen/src/main/java/software/amazon/awssdk/codegen/emitters/tasks/RulesEngineRuntimeLiteGeneratorTask.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.codegen.emitters.tasks;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import software.amazon.awssdk.codegen.emitters.GeneratorTaskParams;
+import software.amazon.awssdk.codegen.model.config.customization.CustomizationConfig;
+
+/** A version of {@link software.amazon.awssdk.codegen.emitters.tasks.RulesEngineRuntimeGeneratorTask} that copies a minimal
+ * set of the interpreter related classes. This set represents the only classes that need to be copied when compiled rules are
+ * enabled.
+ *
+ * @see CustomizationConfig#isEnableGenerateCompiledEndpointRules()
+ */
+public final class RulesEngineRuntimeLiteGeneratorTask extends RulesEngineRuntimeGeneratorTask {
+    // Note: leading slashes are important to disambiguate between files that share the same suffix
+    private static final List<String> FILES_TO_COPY = Stream.of("/Outputs.java.resource",
+                                                                "/RegionOverride.java.resource",
+                                                                "/Partition.java.resource",
+                                                                "/PartitionDataProvider.java.resource",
+                                                                "/AwsEndpointProviderUtils.java.resource",
+                                                                "/Arn.java.resource",
+                                                                "/Value.java.resource",
+                                                                "/Identifier.java.resource",
+                                                                "/EndpointAuthSchemeStrategy.java.resource",
+                                                                "/EndpointAttributeProvider.java.resource",
+                                                                "/EndpointAuthSchemeStrategyFactory.java.resource",
+                                                                "/DefaultEndpointAuthSchemeStrategy.java.resource")
+                                                            .collect(Collectors.toList());
+
+    public RulesEngineRuntimeLiteGeneratorTask(GeneratorTaskParams generatorTaskParams) {
+        super(generatorTaskParams);
+    }
+
+    protected List<String> rulesEngineJavaFilePaths(Collection<String> runtimeEngineFiles) {
+        return super.rulesEngineJavaFilePaths(runtimeEngineFiles)
+                    .stream()
+                    .filter(e -> FILES_TO_COPY.stream().anyMatch(e::endsWith))
+                    .collect(Collectors.toList());
+    }
+}