svn commit: r815588 - /incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java

[bl...@apache.org]

Author: bluk
Date: Wed Sep 16 02:10:31 2009
New Revision: 815588

URL: http://svn.apache.org/viewvc?rev=815588&view=rev
Log:
Test to ensure map types in ProvidersRegistry

Thanks Mike Rheinheimer for the contribution.

See [WINK-179]

Added:
    incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java   (with props)

Added: incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java
URL: http://svn.apache.org/viewvc/incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java?rev=815588&view=auto
==============================================================================
--- incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java (added)
+++ incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java Wed Sep 16 02:10:31 2009
@@ -0,0 +1,65 @@
+/*******************************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.wink.common.internal.registry;
+
+import java.lang.reflect.Field;
+import java.util.concurrent.ConcurrentHashMap;
+
+import junit.framework.TestCase;
+
+import org.apache.wink.common.internal.application.ApplicationValidator;
+import org.apache.wink.common.internal.lifecycle.LifecycleManagersRegistry;
+
+public class ProvidersRegistryTest extends TestCase {
+    
+    /**
+     * Tests that the providersCache object is and remains instanceof ConcurrentHashMap.  
+     * 
+     * ProvidersRegistry.MediaTypeMap uses type ConcurrentHashMap on the providersCache object to provide some lock protection on
+     * the map when providers are dynamically added.  However, lock protection is already built into the ProvidersRegistry methods:
+     * getContextResolver(), getMessageBodyReader(), and getMessageBodyWriter().
+     * 
+     * However, the second protection (in the ProvidersRegistry methods) is for the cache itself which could be written to by two
+     * different threads even if they both were getting a single MessageBodyReader (i.e. a cache value may be dropped and then two
+     * threads come back later and try to write a new cache value).  Due to some weird HashMap properties, this can blow up in
+     * weird ways.
+     * 
+     * Thus, we need to ensure the providersCache continues to be instantiated with ConcurrentHashMap.
+     */
+    public void testProtectionModel() throws Exception {
+
+        // I need the instantiated object providersCache in the abstract private nested class MediaTypeMap, so here we go!
+        ProvidersRegistry providersRegistry = new ProvidersRegistry(new LifecycleManagersRegistry(), new ApplicationValidator());
+        Field field = providersRegistry.getClass().getDeclaredField("messageBodyReaders");
+        field.setAccessible(true);
+        Object messageBodyReaders = field.get(providersRegistry);
+        System.out.println(messageBodyReaders.getClass().getSuperclass().getName());
+        Field field2 = messageBodyReaders.getClass().getSuperclass().getDeclaredField("providersCache");
+        field2.setAccessible(true);
+        Object providersCache = field2.get(messageBodyReaders);
+        
+        assertTrue(providersCache instanceof ConcurrentHashMap);    
+    }
+    
+    // TODO:  perhaps future tests should be added to actually exercise the providersCache code, but it would be an involved,
+    // multi-threaded test that dynamically adds providers at just the right time to ensure no problems with
+    // concurrent writes.
+    
+}

Propchange: incubator/wink/trunk/wink-common/src/test/java/org/apache/wink/common/internal/registry/ProvidersRegistryTest.java
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