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Java example source code file (LoggerInjectionTest.java)

This example Java source code file (LoggerInjectionTest.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

abstractmodule, creationexception, foo, inject, injector, log, logger, loggerinjectiontest, logging, provider, suppresswarnings, testcase

The LoggerInjectionTest.java Java example source code

package com.google.inject;

import static com.google.inject.Asserts.assertContains;

import com.google.inject.name.Names;

import junit.framework.TestCase;

import java.util.logging.Logger;

/**
 * Test built-in injection of loggers.
 *
 * @author jessewilson
 */
public class LoggerInjectionTest extends TestCase {

  @Inject Logger logger;

  public void testLoggerWithMember() {
    Injector injector = Guice.createInjector();
    injector.injectMembers(this);
    assertEquals("com.google.inject.LoggerInjectionTest", logger.getName());
  }
  
  public void testLoggerInConstructor() {
    Injector injector = Guice.createInjector();
    Foo foo = injector.getInstance(Foo.class);
    assertEquals("com.google.inject.LoggerInjectionTest$Foo", foo.logger.getName());
  }
  
  private static class Foo {
    Logger logger;
    @SuppressWarnings("unused")
    @Inject Foo(Logger logger) {
      this.logger = logger;
    }
  }
  
  public void testLoggerWithoutMember() {
    Injector injector = Guice.createInjector();
    assertNull(injector.getInstance(Logger.class).getName());
    assertNull(injector.getProvider(Logger.class).get().getName());
    assertNull(injector.getBinding(Logger.class).getProvider().get().getName());
    assertEquals("Provider<Logger>", injector.getProvider(Logger.class).toString());
  }

  public void testCanBindAnnotatedLogger() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(Logger.class)
            .annotatedWith(Names.named("anonymous"))
            .toInstance(Logger.getAnonymousLogger());
      }
    });

    assertNull(injector.getInstance(Key.get(Logger.class, Names.named("anonymous"))).getName());
  }
  
  public void testCannotBindLogger() {
    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          bind(Logger.class).toInstance(Logger.getAnonymousLogger());
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "A binding to java.util.logging.Logger was already configured");
    }
  }
}

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