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Java example source code file (PerformanceComparison.java)

This example Java source code file (PerformanceComparison.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, bar, barimpl, callable, constructorargumentvalues, decimalformat, exception, foo, inject, rootbeandefinition, runtimebeanreference, runtimeexception, string, tee, teeimpl, text, threading, threads

The PerformanceComparison.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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.google.inject;

import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertSame;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;

import java.lang.annotation.Retention;
import java.text.DecimalFormat;
import java.util.concurrent.Callable;

/**
 * A semi-useless microbenchmark. Spring and Guice constuct the same object
 * graph a bunch of times, and we see who can construct the most per second.
 * As of this writing Guice is more than 50X faster. Also useful for comparing 
 * pure Java configuration options.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public class PerformanceComparison {

  public static void main(String[] args) throws Exception {
    // Once warm up. Takes lazy loading out of the equation and ensures we
    // created the graphs properly.
    validate(springFactory);
    validate(juiceFactory);
    validate(byHandFactory);

    for (int i2 = 0; i2 < 10; i2++) {
      iterate(springFactory, "Spring:  ");
      iterate(juiceFactory,  "Guice:   ");
      iterate(byHandFactory, "By Hand: ");

      System.err.println();
    }

    System.err.println("Concurrent:");

    for (int i2 = 0; i2 < 10; i2++) {
      concurrentlyIterate(springFactory, "Spring:  ");
      concurrentlyIterate(juiceFactory,  "Guice:   ");
      concurrentlyIterate(byHandFactory, "By Hand: ");

      System.err.println();
    }
  }

  static final Callable<Foo> springFactory = new Callable() {

    final DefaultListableBeanFactory beanFactory;

    {
      beanFactory = new DefaultListableBeanFactory();

      RootBeanDefinition tee = new RootBeanDefinition(TeeImpl.class, true);
      tee.setLazyInit(true);
      ConstructorArgumentValues teeValues = new ConstructorArgumentValues();
      teeValues.addGenericArgumentValue("test");
      tee.setConstructorArgumentValues(teeValues);

      RootBeanDefinition bar = new RootBeanDefinition(BarImpl.class, false);
      ConstructorArgumentValues barValues = new ConstructorArgumentValues();
      barValues.addGenericArgumentValue(new RuntimeBeanReference("tee"));
      barValues.addGenericArgumentValue(5);
      bar.setConstructorArgumentValues(barValues);

      RootBeanDefinition foo = new RootBeanDefinition(Foo.class, false);
      MutablePropertyValues fooValues = new MutablePropertyValues();
      fooValues.addPropertyValue("i", 5);
      fooValues.addPropertyValue("bar", new RuntimeBeanReference("bar"));
      fooValues.addPropertyValue("copy", new RuntimeBeanReference("bar"));
      fooValues.addPropertyValue("s", "test");
      foo.setPropertyValues(fooValues);

      beanFactory.registerBeanDefinition("foo", foo);
      beanFactory.registerBeanDefinition("bar", bar);
      beanFactory.registerBeanDefinition("tee", tee);
    }

    public Foo call() throws Exception {
      return (Foo) beanFactory.getBean("foo");
    }
  };

  static final Callable<Foo> juiceFactory = new Callable() {
    final Provider<Foo> fooProvider;
    {
      Injector injector;
      try {
        injector = Guice.createInjector(new AbstractModule() {
          protected void configure() {
            bind(Tee.class).to(TeeImpl.class);
            bind(Bar.class).to(BarImpl.class);
            bind(Foo.class);
            bindConstant().annotatedWith(I.class).to(5);
            bindConstant().annotatedWith(S.class).to("test");
          }
        });
      } catch (CreationException e) {
        throw new RuntimeException(e);
      }
      fooProvider = injector.getProvider(Foo.class);
    }

    public Foo call() throws Exception {
      return fooProvider.get();
    }
  };

  static final Callable<Foo> byHandFactory = new Callable() {
    final Tee tee = new TeeImpl("test");
    public Foo call() throws Exception {
      Foo foo = new Foo();
      foo.setI(5);
      foo.setS("test");
      Bar bar = new BarImpl(tee, 5);
      Bar copy = new BarImpl(tee, 5);
      foo.setBar(bar);
      foo.setCopy(copy);
      return foo;
    }
  };

  static void validate(Callable<Foo> t) throws Exception {
    Foo foo = t.call();
    assertEquals(5, foo.i);
    assertEquals("test", foo.s);
    assertSame(foo.bar.getTee(), foo.copy.getTee());
    assertEquals(5, foo.bar.getI());
    assertEquals("test", foo.bar.getTee().getS());
  }

  static final DecimalFormat format = new DecimalFormat();

  static void iterate(Callable<Foo> callable, String label) {
    int count = 100000;

    long time = System.currentTimeMillis();

    for (int i = 0; i < count; i++) {
      try {
        callable.call();
      }
      catch (Exception e) {
        throw new RuntimeException(e);
      }
    }

    time = System.currentTimeMillis() - time;

    System.err.println(label
        + format.format(count * 1000 / time) + " creations/s");
  }

  static void concurrentlyIterate(final Callable<Foo> callable, String label) {
    int threadCount = 10;
    final int count = 10000;

    Thread[] threads = new Thread[threadCount];

    for (int i = 0; i < threadCount; i++) {
      threads[i] = new Thread() {
        public void run() {
          for (int i = 0; i < count; i++) {
            try {
              validate(callable);
            }
            catch (Exception e) {
              throw new RuntimeException(e);
            }
          }
        }
      };
    }


    long time = System.currentTimeMillis();

    for (int i = 0; i < threadCount; i++) {
      threads[i].start();
    }

    for (int i = 0; i < threadCount; i++) {
      try {
        threads[i].join();
      }
      catch (InterruptedException e) {
        throw new RuntimeException(e);
      }
    }

    time = System.currentTimeMillis() - time;

    System.err.println(label
        + format.format(count * 1000 / time) + " creations/s");
  }

  public static class Foo {

    Bar bar;
    Bar copy;
    String s;
    int i;

    @Inject
    public void setI(@I int i) {
      this.i = i;
    }

    @Inject
    public void setBar(Bar bar) {
      this.bar = bar;
    }

    @Inject
    public void setCopy(Bar copy) {
      this.copy = copy;
    }

    @Inject
    public void setS(@S String s) {
      this.s = s;
    }
  }

  interface Bar {

    Tee getTee();
    int getI();
  }

  public static class BarImpl implements Bar {

    final int i;
    final Tee tee;

    @Inject
    public BarImpl(Tee tee, @I int i) {
      this.tee = tee;
      this.i = i;
    }

    public Tee getTee() {
      return tee;
    }

    public int getI() {
      return i;
    }
  }

  interface Tee {

    String getS();
  }

  @Singleton
  public static class TeeImpl implements Tee {

    final String s;

    @Inject
    public TeeImpl(@S String s) {
      this.s = s;
    }

    public String getS() {
      return s;
    }
  }

  @Retention(RUNTIME)
  @BindingAnnotation @interface I {}

  @Retention(RUNTIME)
  @BindingAnnotation @interface S {}
}

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