com.mycila.guice.ext.injection.Perf.java Source code

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Here is the source code for com.mycila.guice.ext.injection.Perf.java

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/**
 * Copyright (C) 2010 Mycila (mathieu.carbou@gmail.com)
 *
 * 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 com.mycila.guice.ext.injection; /**
                                        * Copyright (C) 2010 Mycila <mathieu.carbou@gmail.com>
                                        *
                                        * 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.
                                        */

import com.google.common.collect.Iterables;

import java.io.File;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * @author Mathieu Carbou (mathieu.carbou@gmail.com)
 */
public class Perf {

    public static void main(String[] args) throws Exception {
        perfTestMembers();
    }

    private static void perfTestMembers() throws Exception {
        List<Class<?>> classes = new LinkedList<Class<?>>();
        JarFile jarFile = new JarFile(new File("C:\\Program Files\\Java\\jdk1.7.0_15\\jre\\lib\\rt.jar"));
        Enumeration<JarEntry> enums = jarFile.entries();
        while (enums.hasMoreElements()) {
            JarEntry entry = enums.nextElement();
            if (entry.getName().endsWith(".class")) {
                if (entry.getName().startsWith("javax/swing") || entry.getName().startsWith("java/awt")
                        || entry.getName().startsWith("java/awt"))
                    classes.add(Class
                            .forName(entry.getName().replace('/', '.').substring(0, entry.getName().length() - 6)));
            }
        }
        System.out.println("classes: " + classes.size());

        // start visual VM
        Thread.sleep(10000);

        for (int i = 0; i < 100; i++) {
            System.out.println(Runtime.getRuntime().freeMemory());
            long time = System.nanoTime();
            for (Class<?> c : classes) {
                Iterables.size(Reflect.findAllAnnotatedMethods(c, Deprecated.class));
            }
            long end = System.nanoTime();
            System.out.println((end - time) + "ns = " + ((end - time) / 1000000) + "ms");
        }
    }
}