use weak references in LIRS cache

h2/src/test/org/h2/test/store/TestCacheLongKeyLIRS.java

@@ -46,13 +46,17 @@ public class TestCacheLongKeyLIRS extends TestBase {
         testRandomOperations();
     }
 
-    private static void testRandomSmallCache() {
+    private void testRandomSmallCache() {
         Random r = new Random(1);
         for (int i = 0; i < 10000; i++) {
             int j = 0;
             StringBuilder buff = new StringBuilder();
-            CacheLongKeyLIRS<Integer> test = createCache(1 + r.nextInt(10));
+            int maxSize = 1 + r.nextInt(10);
+            buff.append("size:").append(maxSize).append('\n');
+            CacheLongKeyLIRS<Integer> test = createCache(maxSize);
             for (; j < 30; j++) {
+                String lastState = toString(test);
+                try {
                     int key = r.nextInt(5);
                     switch (r.nextInt(3)) {
                         case 0:
@@ -69,6 +73,11 @@ public class TestCacheLongKeyLIRS extends TestBase {
                             buff.append("get ").append(key).append('\n');
                             test.get(key);
                     }
+                    verify(test, null);
+                } catch (Throwable ex) {
+                    println(i + "\n" + buff + "\n" + lastState + "\n" + toString(test));
+                    throw ex;
+                }
             }
         }
     }
@@ -164,22 +173,22 @@ public class TestCacheLongKeyLIRS extends TestBase {
         assertEquals(1, test.getMemory(5));
         assertEquals(0, test.getMemory(4));
         assertEquals(0, test.getMemory(100));
-        assertNull(test.peek(4));
-        assertNull(test.get(4));
+        assertNotNull(test.peek(4));
+        assertNotNull(test.get(4));
         assertEquals(10, test.get(1).intValue());
         assertEquals(20, test.get(2).intValue());
         assertEquals(30, test.get(3).intValue());
-        verify(test, "mem: 4 stack: 3 2 1 cold: 5 non-resident: 4");
+        verify(test, "mem: 5 stack: 3 2 1 cold: 4 5 non-resident:");
         assertEquals(50, test.get(5).intValue());
-        verify(test, "mem: 4 stack: 5 3 2 1 cold: 5 non-resident: 4");
+        verify(test, "mem: 5 stack: 5 3 2 1 cold: 5 4 non-resident:");
         assertEquals(50, test.get(5).intValue());
-        verify(test, "mem: 4 stack: 5 3 2 cold: 1 non-resident: 4");
+        verify(test, "mem: 5 stack: 5 3 2 cold: 1 4 non-resident:");
 
         // remove
         assertEquals(50, test.remove(5).intValue());
         assertNull(test.remove(5));
-        verify(test, "mem: 3 stack: 3 2 1 cold: non-resident: 4");
-        assertNull(test.remove(4));
+        verify(test, "mem: 4 stack: 3 2 1 cold: 4 non-resident:");
+        assertNotNull(test.remove(4));
         verify(test, "mem: 3 stack: 3 2 1 cold: non-resident:");
         assertNull(test.remove(4));
         verify(test, "mem: 3 stack: 3 2 1 cold: non-resident:");
@@ -195,7 +204,7 @@ public class TestCacheLongKeyLIRS extends TestBase {
         verify(test, "mem: 3 stack: 4 3 2 cold: non-resident: 1");
         assertEquals(20, test.remove(2).intValue());
         assertFalse(test.containsKey(1));
-        assertNull(test.remove(1));
+        assertEquals(10, test.remove(1).intValue());
         assertFalse(test.containsKey(1));
         verify(test, "mem: 2 stack: 4 3 cold: non-resident:");
         test.put(1,  10);
@@ -226,7 +235,7 @@ public class TestCacheLongKeyLIRS extends TestBase {
         // 1 was non-resident, so this should make it hot
         test.put(1, 10);
         verify(test, "mem: 4 stack: 1 5 4 3 cold: 2 non-resident: 5");
-        assertFalse(test.containsValue(50));
+        assertTrue(test.containsValue(50));
         test.remove(2);
         test.remove(3);
         test.remove(4);
@@ -332,8 +341,8 @@ public class TestCacheLongKeyLIRS extends TestBase {
         for (int i = 0; i < 20; i++) {
             test.put(i, 10 * i);
         }
-        verify(test, "mem: 4 stack: 19 18 17 16 15 14 13 12 11 10 3 2 1 " +
-                "cold: 19 non-resident: 18 17 16 15 14 13 12 11 10");
+        verify(test, "mem: 4 stack: 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 " +
+                     "cold: 19 non-resident: 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 0");
     }
 
     private void testLimitMemory() {
@@ -344,13 +353,13 @@ public class TestCacheLongKeyLIRS extends TestBase {
         verify(test, "mem: 4 stack: 4 3 2 1 cold: 4 non-resident: 0");
         assertTrue("" + test.getUsedMemory(), test.getUsedMemory() <= 4);
         test.put(6, 60, 3);
-        verify(test, "mem: 4 stack: 6 4 3 cold: 6 non-resident: 2 1 4");
+        verify(test, "mem: 4 stack: 6 4 3 cold: 6 non-resident: 2 1 4 0");
         assertTrue("" + test.getUsedMemory(), test.getUsedMemory() <= 4);
         test.put(7, 70, 3);
-        verify(test, "mem: 4 stack: 7 6 3 cold: 7 non-resident: 6 2 1");
+        verify(test, "mem: 4 stack: 7 6 4 3 cold: 7 non-resident: 6 2 1 4 0");
         assertTrue("" + test.getUsedMemory(), test.getUsedMemory() <= 4);
         test.put(8, 80, 4);
-        verify(test, "mem: 4 stack: 8 cold: non-resident:");
+        verify(test, "mem: 4 stack: 8 cold: non-resident: 3 7 6 2 1 4 0");
         assertTrue("" + test.getUsedMemory(), test.getUsedMemory() <= 4);
     }
 
@@ -369,7 +378,7 @@ public class TestCacheLongKeyLIRS extends TestBase {
             test.put(i, i * 10);
             test.get(i);
             if (log) {
-                System.out.println("get " + i + " -> " + test);
+                println("get " + i + " -> " + test);
             }
         }
         verify(test, null);
@@ -394,14 +403,13 @@ public class TestCacheLongKeyLIRS extends TestBase {
             }
             verify(test, null);
         }
+
         // ensure 0..9 are hot, 10..17 are not resident, 18..19 are cold
         for (int i = 0; i < size; i++) {
             Integer x = test.get(i);
             if (i < size / 2 || i == size - 1 || i == size - 2) {
                 assertNotNull("i: " + i, x);
                 assertEquals(i * 10, x.intValue());
-            } else {
-                assertNull(x);
             }
             verify(test, null);
         }