a trivial lrucache test to validate resize is not crazy

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@943861 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/test/java/org/apache/activemq/util/LRUCacheTest.java

@@ -0,0 +1,34 @@
+package org.apache.activemq.util;
+
+import static org.junit.Assert.assertEquals;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.junit.Test;
+
+public class LRUCacheTest {
+    protected static final Log LOG = LogFactory.getLog(LRUCacheTest.class);
+    
+    @Test
+    public void testResize() throws Exception {
+        LRUCache<Long, Long> underTest = new LRUCache<Long, Long>(1000);
+        
+        Long count = new Long(0);
+        long max = 0;
+        for (; count < 27276827; count++) {
+            long start = System.currentTimeMillis();
+            if (!underTest.containsKey(count)) {
+                underTest.put(count, count);
+            }
+            long duration = System.currentTimeMillis() - start;
+            if (duration > max) {
+                LOG.info("count: " + count + ", new max=" + duration);
+                max = duration;
+            }
+            if (count % 100000000 == 0) {
+                LOG.info("count: " + count + ", max=" + max);
+            }
+        }
+        assertEquals("size is still in order", 1000, underTest.size());
+    }
+}