Return the changed classes as response of redefine classes command (#277)

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

Author: testforstephen

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/adapter/handler/HotCodeReplaceHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright (c) 2017 Microsoft Corporation and others.
+* Copyright (c) 2017-2019 Microsoft Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
@@ -25,6 +25,7 @@
 import com.microsoft.java.debug.core.protocol.Requests;
 import com.microsoft.java.debug.core.protocol.Requests.Arguments;
 import com.microsoft.java.debug.core.protocol.Requests.Command;
+import com.microsoft.java.debug.core.protocol.Responses;
 
 public class HotCodeReplaceHandler implements IDebugRequestHandler {
     @Override
@@ -58,7 +59,10 @@ public CompletableFuture<Response> handle(Command command, Arguments arguments,
 
         IHotCodeReplaceProvider provider = context.getProvider(IHotCodeReplaceProvider.class);
 
-        return provider.redefineClasses().thenApply(classNames -> response);
+        return provider.redefineClasses().thenApply(classNames -> {
+            response.body = new Responses.RedefineClassesResponse(classNames.toArray(new String[0]));
+            return response;
+        });
     }
 
 }

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/protocol/Responses.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright (c) 2017 Microsoft Corporation and others.
+* Copyright (c) 2017-2019 Microsoft Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
@@ -245,4 +245,15 @@ public ExceptionInfoResponse(String exceptionId, String description, ExceptionBr
             this.details = details;
         }
     }
+
+    public static class RedefineClassesResponse extends ResponseBody {
+        public String[] changedClasses = new String[0];
+
+        /**
+         * Constructor.
+         */
+        public RedefineClassesResponse(String[] changedClasses) {
+            this.changedClasses = changedClasses;
+        }
+    }
 }