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[utils] / support / general / src / test / java / org / wamblee / cache / CachedObjectTest.java

diff --git a/support/general/src/test/java/org/wamblee/cache/CachedObjectTest.java b/support/general/src/test/java/org/wamblee/cache/CachedObjectTest.java
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+/*
+ * Copyright 2005 the original author or authors.
+ * 
+ * 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 org.wamblee.cache;
+
+import java.io.IOException;
+
+import junit.framework.TestCase;
+import net.sf.ehcache.CacheException;
+
+import org.wamblee.io.TestResource;
+import org.wamblee.test.TimingUtils;
+
+/**
+ * Cached object test. 
+ *
+ * @author Erik Brakkee
+ */
+public class CachedObjectTest extends TestCase {
+    
+    /**
+     * 
+     */
+    private static final String EHCACHE_CONFIG = "ehcache.xml";
+
+    private static final int OBJECT_KEY = 10; 
+    
+    private CachedObject.Computation<Integer,Integer> _computation;
+    private int _ncomputations; 
+    
+    /* (non-Javadoc)
+     * @see junit.framework.TestCase#setUp()
+     */
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        _computation = new CachedObject.Computation<Integer,Integer>() { 
+            public Integer getObject(Integer aObjectKey) {
+                _ncomputations++;
+                return compute(aObjectKey);
+            };
+        };
+        _ncomputations = 0; 
+    }
+    
+    private int compute(int aValue) { 
+        return aValue + 10;
+    }
+    
+    private CachedObject<Integer, Integer> createCached(Cache<Integer,Integer> aCache) { 
+        return new CachedObject<Integer, Integer>(aCache, OBJECT_KEY, _computation);
+    }
+
+    /**
+     * Verifies that upon first use, the cached object uses the computation to 
+     * retrieve the object.  
+     *
+     */
+    public void testComputation() { 
+        CachedObject<Integer, Integer> cached = createCached(new ZeroCache<Integer,Integer>());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations); 
+    }
+    
+    public void testInvalidateCache() { 
+        CachedObject<Integer, Integer> cached = createCached(new ForeverCache<Integer,Integer>());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations);
+        cached.invalidate(); 
+        value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(2, _ncomputations);
+    }
+    
+    public void testBehaviorEhCache() throws CacheException, IOException {
+        Cache<Integer,Integer> cache = new EhCache<Integer,Integer>(new TestResource(CachedObjectTest.class, EHCACHE_CONFIG), "test");
+        CachedObject<Integer, Integer> cached = createCached(cache);
+        
+        assertTrue( cache == cached.getCache());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations);
+        // The value must still be cached. 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations);
+        
+        // Cache expiry. 
+        TimingUtils.sleep(6000); 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(2, _ncomputations);
+        
+        // Should still be cached now.
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(2, _ncomputations);
+        
+        // explicit invalidation.
+        cached.invalidate(); 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(3, _ncomputations);
+        
+    }
+    
+    public void testBehaviorEhCacheDefault() throws CacheException, IOException {
+        Cache<Integer,Integer> cache = new EhCache<Integer,Integer>(new TestResource(CachedObjectTest.class, EHCACHE_CONFIG), "undefined");
+        CachedObject<Integer, Integer> cached = createCached(cache);
+        
+        assertTrue( cache == cached.getCache());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations);
+        // The value must still be cached. 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations);
+        
+        // Cache expiry. 
+        TimingUtils.sleep(6000); 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(2, _ncomputations);
+        
+        // Should still be cached now.
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(2, _ncomputations);
+        
+    }
+    
+    
+    public void testBehaviorForeverCache() { 
+        CachedObject<Integer, Integer> cached = createCached(new ForeverCache<Integer,Integer>());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations); 
+        for (int ncomp = 2; ncomp <= 100; ncomp++) { 
+            value = cached.get(); 
+            assertEquals(compute(OBJECT_KEY), value);
+            assertEquals(1, _ncomputations);
+        }
+    }
+    
+    public void testBehaviorZeroCache() { 
+        CachedObject<Integer, Integer> cached = createCached(new ZeroCache<Integer,Integer>());
+        int value = cached.get();
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(1, _ncomputations); 
+        for (int ncomp = 2; ncomp <= 100; ncomp++) { 
+            value = cached.get(); 
+            assertEquals(compute(OBJECT_KEY), value);
+            assertEquals(ncomp, _ncomputations);
+        }
+        cached.invalidate(); 
+        value = cached.get(); 
+        assertEquals(compute(OBJECT_KEY), value);
+        assertEquals(101, _ncomputations);
+    }
+}