Prevent race condition in entity filtering (eclipse-ee4j#4204)

Signed-off-by: Jan Supol <jan.supol@oracle.com>

Author: jansupol

ext/entity-filtering/src/main/java/org/glassfish/jersey/message/filtering/EntityGraphProviderImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -82,4 +82,10 @@ public ObjectGraph createObjectGraph(final Class<?> entityClass, final Set<Strin
                 ? new EmptyObjectGraph(entityClass)
                 : new ObjectGraphImpl(classToGraph, entityGraph, filteringScopes);
     }
+
+    @Override
+    public EntityGraph putIfAbsent(Class<?> entityClass, EntityGraph entityGraph, boolean forWriter) {
+        final ConcurrentMap<Class<?>, EntityGraph> classToGraph = forWriter ? writerClassToGraph : readerClassToGraph;
+        return classToGraph.putIfAbsent(entityClass, entityGraph);
+    }
 }

ext/entity-filtering/src/main/java/org/glassfish/jersey/message/filtering/EntityInspectorImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -50,7 +50,6 @@
  */
 @Singleton
 final class EntityInspectorImpl implements EntityInspector {
-
     private final List<EntityProcessor> entityProcessors;
 
     @Inject
@@ -71,21 +70,26 @@ public EntityInspectorImpl(final InjectionManager injectionManager) {
     @Override
     public void inspect(final Class<?> entityClass, final boolean forWriter) {
         if (!graphProvider.containsEntityGraph(entityClass, forWriter)) {
-            final EntityGraph graph = graphProvider.getOrCreateEntityGraph(entityClass, forWriter);
+            final EntityGraph graph = new EntityGraphImpl(entityClass);
             final Set<Class<?>> inspect = new HashSet<>();
 
             // Class.
             if (!inspectEntityClass(entityClass, graph, forWriter)) {
                 // Properties.
-                final Map<String, Method> unmatchedAccessors = inspectEntityProperties(entityClass, graph, inspect, forWriter);
+                final Map<String, Method> unmatchedAccessors =
+                        inspectEntityProperties(entityClass, graph, inspect, forWriter);
 
                 // Setters/Getters without fields.
                 inspectStandaloneAccessors(unmatchedAccessors, graph, forWriter);
 
+                graphProvider.putIfAbsent(entityClass, graph, forWriter);
+
                 // Inspect new classes.
                 for (final Class<?> clazz : inspect) {
                     inspect(clazz, forWriter);
                 }
+            } else {
+                graphProvider.putIfAbsent(entityClass, graph, forWriter);
             }
         }
     }

ext/entity-filtering/src/main/java/org/glassfish/jersey/message/filtering/spi/EntityGraphProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -66,4 +66,15 @@ public interface EntityGraphProvider {
      * @return an entity-filtering object graph instance.
      */
     public ObjectGraph createObjectGraph(final Class<?> entityClass, final Set<String> filteringScopes, final boolean forWriter);
+
+    /**
+     * Store an {@code EntityGraph} for a given entity if not already stored
+     * @param entityClass entity class which the object graph should be created for.
+     * @param entityGraph an entity graph to be stored
+     * @param forWriter flag determining whether the graph should be created for writer/reader.
+     * @return the previous value associated with the {@code entityClass, forWriter} key,
+     *         or {@code null} if there was no previous mapping for the key. This behavior is inherited from
+     *         {@link java.util.Map#putIfAbsent(Object, Object)}.
+     */
+    public EntityGraph putIfAbsent(final Class<?> entityClass, EntityGraph entityGraph, final boolean forWriter);
 }