Added cache clear method

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@15778 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/cache/lookup/EntityLookupCache.java

@@ -621,6 +621,21 @@ public class EntityLookupCache<K extends Serializable, V extends Object, VK exte
         cache.remove(valueCacheKey);
     }
     
+    /**
+     * Cache-only operation: Remove all cache entries
+     * <p/>
+     * <b>NOTE:</b> This operation removes ALL entries for ALL cache regions.
+     */
+    public void clear()
+    {
+        // Handle missing cache
+        if (cache == null)
+        {
+            return;
+        }
+        cache.clear();
+    }
+    
     /**
      * Key-wrapper used to separate cache regions, allowing a single cache to be used for different
      * purposes.<b/>

source/java/org/alfresco/repo/cache/lookup/EntityLookupCacheTest.java

@@ -213,6 +213,21 @@ public class EntityLookupCacheTest extends TestCase implements EntityLookupCallb
         assertNull(database.get(id));
         assertEquals(0, cache.getKeys().size());
     }
+    
+    public void testClear() throws Exception
+    {
+        TestValue valueOne = new TestValue(getName() + "-ONE");
+        Pair<Long, Object> entityPairOne = entityLookupCacheA.getOrCreateByValue(valueOne);
+        assertNotNull(entityPairOne);
+        Long id = entityPairOne.getFirst();
+        assertEquals(valueOne.val, database.get(id));
+        assertEquals(2, cache.getKeys().size());
+        
+        // Clear it
+        entityLookupCacheA.clear();
+        assertEquals(valueOne.val, database.get(id));               // Must still be in database
+        assertEquals(0, cache.getKeys().size());                    // ... but cache must be empty
+    }
 
     /**
      * Helper class to represent business object