Status: New
Owner: ----
New issue 572 by [email protected]: Performance problem or wrong usage?
http://code.google.com/p/google-guice/issues/detail?id=572
Hello,
this is my first contact mit DI and Guice.
I have a question about the performance from Guice.
The following small JUnit is creating some object with Guice
and by a own factory implementation.
If I measure the object creation (and some setters), Guice is
up to 50 times slower then the own code.
Do I use Guice in a wrong way or is the performance as bad as I have
measured?
Uwe
-----
package sandbox.guice.performance;
import static org.junit.Assert.*;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import com.google.inject.Binder;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
public class PerfTest {
static private final int max = 1000000;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
}
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
static interface Person {
public abstract String getFirstName();
public abstract void setFirstName(String firstName);
public abstract String getLastName();
public abstract void setLastName(String lastName);
}
static class RealPerson implements Person {
private String firstName;
private String lastName;
@Override
public String getFirstName() {
return firstName;
}
@Override
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@Override
public String getLastName() {
return lastName;
}
@Override
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
static abstract class PersonFactory {
static Person createPerson() {return new RealPerson();}
}
@Test
public void testClassicWay () throws Exception {
long t1 = System.currentTimeMillis();
for (int i = 0; i < max; i++) {
Person person = PersonFactory.createPerson();
// person.setFirstName("Guice");
// person.setLastName("Google");
//
// assertEquals(RealPerson.class, person.getClass());
// assertEquals("Guice" , person.getFirstName());
// assertEquals("Google", person.getLastName());
}
long t2 = System.currentTimeMillis();
System.out.format("%-20s %6d %5dms\n", "ClassicWay", max,
(t2-t1));
}
@Test
public void testGuiceSimple () throws Exception {
Injector injector = Guice.createInjector(new Module() {
@Override
public void configure(Binder binder) {
binder.bind(Person.class).to(RealPerson.class);
}
});
long t1 = System.currentTimeMillis();
for (int i = 0; i < max; i++) {
Person person = injector.getInstance(Person.class);
// person.setFirstName("Guice");
// person.setLastName("Google");
//
// assertEquals(RealPerson.class, person.getClass());
// assertEquals("Guice" , person.getFirstName());
// assertEquals("Google", person.getLastName());
}
long t2 = System.currentTimeMillis();
System.out.format("%-20s %6d %5dms\n", "GuiceSimple", max,
(t2-t1));
}
}
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