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test/javax/el/TesterImportHandlerPerformance.java

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+/*
+ * 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 javax.el;
+
+import org.junit.Test;
+
+public class TesterImportHandlerPerformance {
+
+    /*
+     * This test is looking at the cost of looking up a class when the standard
+     * JSP package imports are present:
+     * - java.lang
+     * - javax.servlet
+     * - javax.servlet.http
+     * - javax.servlet.jsp
+     *
+     * Before optimisation, this test took ~4.6s on markt's desktop
+     * After optimisation, this test took ~0.05s on markt's desktop
+     */
+    @Test
+    public void testBug62453() throws Exception {
+        long totalTime = 0;
+        for (int i = 0; i < 100000; i++) {
+            ImportHandler ih = new ImportHandler();
+            ih.importPackage("javax.servlet");
+            ih.importPackage("javax.servlet.http");
+            ih.importPackage("javax.servlet.jsp");
+            long start = System.nanoTime();
+            ih.resolveClass("unknown");
+            long end = System.nanoTime();
+            totalTime += (end -start);
+        }
+        System.out.println("Time taken: " + totalTime + "ns");
+    }
+}