fix recycling of MethodReader args for proxies. Closes #980

src/main/java/net/openhft/chronicle/wire/VanillaMethodReader.java

@@ -677,7 +677,14 @@ private <T> T checkRecycle(T o) {
             ((Collection<?>) o).clear();
             return o;
         }
-        // If object is Marshallable, return the same object, else return null
+        if (o instanceof Map) {
+            ((Map<?, ?>) o).clear();
+            return o;
+        }
+        // For objects of type AbstractMarshallableCfg, reset them to their default state.
+        if (o instanceof AbstractMarshallableCfg) {
+            ((AbstractMarshallableCfg) o).reset();
+        }
         return o instanceof Marshallable ? o : null;
     }
 

src/test/java/net/openhft/chronicle/wire/MethodReaderArgumentsRecycleProxyTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2016-2020 chronicle.software
+ *
+ *       https://chronicle.software
+ *
+ * Licensed 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 net.openhft.chronicle.wire;
+
+import org.junit.After;
+
+// Test class extending MethodReaderArgumentsRecycleTest to test behavior of method readers when using proxies
+public class MethodReaderArgumentsRecycleProxyTest extends MethodReaderArgumentsRecycleTest {
+    @Override
+    public void setUp() {
+        // Disable proxy code generation for the duration of the tests
+        System.setProperty("disableReaderProxyCodegen", "true");
+        super.setUp();
+    }
+
+    @After
+    public void after() {
+        // Clear the property to re-enable proxy code generation
+        System.clearProperty("disableReaderProxyCodegen");
+    }
+}

src/test/java/net/openhft/chronicle/wire/MethodReaderArgumentsRecycleTest.java

@@ -19,6 +19,7 @@
 
 import net.openhft.chronicle.bytes.Bytes;
 import net.openhft.chronicle.bytes.MethodReader;
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -77,6 +78,11 @@ public void dtoCall(RegularDTO d) {
                 lastArgumentRef = d;
             }
 
+            @Override
+            public void configDtoCall(ConfigDTO d) {
+                lastArgumentRef = d;
+            }
+
             @Override
             public void wrappedListCall(ListContainingDto ld) {
                 lastArgumentRef = ld;
@@ -197,6 +203,22 @@ public void testDtoRecycled() {
         verifyRecycled(first, second, writer::dtoCall);
     }
 
+    @Test
+    public void testConfigDtoRecycled() {
+        ConfigDTO first = new ConfigDTO();
+        first.s = "f";
+        first.b = true;
+
+        ConfigDTO second = new ConfigDTO();
+        second.s = "s";
+        // don't set b
+
+        verifyRecycled(first, second, writer::configDtoCall);
+
+        ConfigDTO dto = (ConfigDTO) lastArgumentRef;
+        Assert.assertFalse(dto.b);
+    }
+
     // Test to ascertain that a DTO object's list field gets recycled between calls.
     @Test
     public void testWrappedListRecycled() {
@@ -258,8 +280,8 @@ public void testWrappedListAsObjectRecycledDTO() {
                 "}\n", lastArgumentRef.toString());
         List<?> list2 = (List<?>) ((ObjectContainingDto) lastArgumentRef).list;
         assertEquals(second.list, list2);
-        assertSame(dto0, (MyDto) list1.get(0));
-        assertSame(dto1, (MyDto) list1.get(1));
+        assertSame(dto0, list1.get(0));
+        assertSame(dto1, list1.get(1));
 
         // Ensure the reference from the first call is the same as the second.
         assertSame(firstRef, lastArgumentRef);
@@ -322,6 +344,8 @@ interface MyInterface {
 
         void dtoCall(RegularDTO d);
 
+        void configDtoCall(ConfigDTO d);
+
         void wrappedListCall(ListContainingDto ld);
 
         void wrappedObjectCall(ObjectContainingDto ld);
@@ -349,6 +373,11 @@ public static class RegularDTO extends SelfDescribingMarshallable {
         int i;
     }
 
+    public static class ConfigDTO extends AbstractMarshallableCfg {
+        String s;
+        boolean b;
+    }
+
     // Definition of a DTO with a list-containing field.
     public static class ListContainingDto extends SelfDescribingMarshallable {
         List<Object> list;