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Java example source code file (BinderTest.java)

This example Java source code file (BinderTest.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, binding, constantmodule, creationexception, hasimplementedby1, hasprovidedby2, injector, key, log, logging, message, override, provider, string, threading, threads, typeliteral, util

The BinderTest.java Java example source code

/**
 * Copyright (C) 2007 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 com.google.inject.Asserts.asModuleChain;
import static com.google.inject.Asserts.assertContains;
import static com.google.inject.Asserts.assertNotSerializable;
import static com.google.inject.Asserts.getDeclaringSourcePart;
import static com.google.inject.Asserts.isIncludeStackTraceOff;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.spi.Message;
import com.google.inject.util.Providers;

import junit.framework.TestCase;

import java.io.IOException;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class BinderTest extends TestCase {

  private final Logger loggerToWatch = Logger.getLogger(Guice.class.getName());

  private final List<LogRecord> logRecords = Lists.newArrayList();
  private final Handler fakeHandler = new Handler() {
    @Override
    public void publish(LogRecord logRecord) {
      logRecords.add(logRecord);
    }
    @Override
    public void flush() {}
    @Override
    public void close() throws SecurityException {}
  };

  Provider<Foo> fooProvider;

  @Override protected void setUp() throws Exception {
    super.setUp();
    loggerToWatch.addHandler(fakeHandler);
  }

  @Override protected void tearDown() throws Exception {
    loggerToWatch.removeHandler(fakeHandler);
    super.tearDown();
  }

  public void testProviderFromBinder() {
    Guice.createInjector(new Module() {
      public void configure(Binder binder) {
        fooProvider = binder.getProvider(Foo.class);

        try {
          fooProvider.get();
        } catch (IllegalStateException e) { /* expected */ }
      }
    });

    assertNotNull(fooProvider.get());
  }

  static class Foo {}

  public void testMissingBindings() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        public void configure() {
          getProvider(Runnable.class);
          bind(Comparator.class);
          requireBinding(Key.get(new TypeLiteral<Callable() {}));
          bind(Date.class).annotatedWith(Names.named("date"));
        }
      });
    } catch (CreationException e) {
      assertEquals(4, e.getErrorMessages().size());
      String segment1 = "No implementation for " + Comparator.class.getName() + " was bound.";
      String segment2 = "No implementation for java.util.Date annotated with @"
          + Named.class.getName() + "(value=date) was bound.";
      String segment3 = "No implementation for java.lang.Runnable was bound.";
      String segment4 = " No implementation for java.util.concurrent.Callable<java.lang.String> was"
          + " bound.";
      String atSegment = "at " + getClass().getName();
      String sourceFileName = getDeclaringSourcePart(getClass());
      if (isIncludeStackTraceOff()) {
        assertContains(e.getMessage(),
            segment1, atSegment, sourceFileName,
            segment2, atSegment, sourceFileName,
            segment3, atSegment, sourceFileName,
            segment4, atSegment, sourceFileName);
      } else {
        assertContains(e.getMessage(),
            segment3, atSegment, sourceFileName,
            segment1, atSegment, sourceFileName,
            segment4, atSegment, sourceFileName,
            segment2, atSegment, sourceFileName);
      }
    }
  }

  public void testMissingDependency() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        public void configure() {
          bind(NeedsRunnable.class);
        }
      });
    } catch (CreationException e) {
      assertEquals(1, e.getErrorMessages().size());
      assertContains(e.getMessage(),
          "No implementation for java.lang.Runnable was bound.",
          "for field at " + NeedsRunnable.class.getName(), ".runnable(BinderTest.java:",
          "at " + getClass().getName(), getDeclaringSourcePart(getClass()));
    }
  }

  static class NeedsRunnable {
    @Inject Runnable runnable;
  }

  public void testDanglingConstantBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          bindConstant();
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Missing constant value. Please call to(...).",
          "at " + getClass().getName());
    }
  }

  public void testRecursiveBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          bind(Runnable.class).to(Runnable.class);
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Binding points to itself.",
          "at " + getClass().getName(), getDeclaringSourcePart(getClass()));
    }
  }

  public void testBindingNullConstant() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          String none = null;
          bindConstant().annotatedWith(Names.named("nullOne")).to(none);
          bind(String.class).annotatedWith(Names.named("nullTwo")).toInstance(none);
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Binding to null instances is not allowed. Use toProvider(Providers.of(null))",
          "2) Binding to null instances is not allowed. Use toProvider(Providers.of(null))");
    }
  }

  public void testToStringOnBinderApi() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          assertEquals("Binder", binder().toString());
          assertEquals("Provider<java.lang.Integer>", getProvider(Integer.class).toString());
          assertEquals("Provider<java.util.List",
              getProvider(Key.get(new TypeLiteral<List() {})).toString());

          assertEquals("BindingBuilder<java.lang.Integer>",
              bind(Integer.class).toString());
          assertEquals("BindingBuilder<java.lang.Integer>",
              bind(Integer.class).annotatedWith(Names.named("a")).toString());
          assertEquals("ConstantBindingBuilder", bindConstant().toString());
          assertEquals("ConstantBindingBuilder",
              bindConstant().annotatedWith(Names.named("b")).toString());
          assertEquals("AnnotatedElementBuilder",
              binder().newPrivateBinder().expose(Integer.class).toString());
        }
      });
      fail();
    } catch (CreationException ignored) {
    }
  }

  public void testNothingIsSerializableInBinderApi() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override public void configure() {
          try {
            assertNotSerializable(binder());
            assertNotSerializable(getProvider(Integer.class));
            assertNotSerializable(getProvider(Key.get(new TypeLiteral<List() {})));
            assertNotSerializable(bind(Integer.class));
            assertNotSerializable(bind(Integer.class).annotatedWith(Names.named("a")));
            assertNotSerializable(bindConstant());
            assertNotSerializable(bindConstant().annotatedWith(Names.named("b")));
          } catch (IOException e) {
            fail(e.getMessage());
          }
        }
      });
      fail();
    } catch (CreationException ignored) {
    }
  }

  /**
   * Although {@code String[].class} isn't equal to {@code new
   * GenericArrayTypeImpl(String.class)}, Guice should treat these two types
   * interchangeably.
   */
  public void testArrayTypeCanonicalization() {
    final String[] strings = new String[] { "A" };
    final Integer[] integers = new Integer[] { 1 };

    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(String[].class).toInstance(strings);
        bind(new TypeLiteral<Integer[]>() {}).toInstance(integers);
      }
    });

    assertSame(integers, injector.getInstance(Key.get(new TypeLiteral<Integer[]>() {})));
    assertSame(integers, injector.getInstance(new Key<Integer[]>() {}));
    assertSame(integers, injector.getInstance(Integer[].class));
    assertSame(strings, injector.getInstance(Key.get(new TypeLiteral<String[]>() {})));
    assertSame(strings, injector.getInstance(new Key<String[]>() {}));
    assertSame(strings, injector.getInstance(String[].class));

    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(String[].class).toInstance(new String[] { "A" });
          bind(new TypeLiteral<String[]>() {}).toInstance(new String[] { "B" });
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) A binding to java.lang.String[] was already configured at " + getClass().getName(),
          "at " + getClass().getName(), getDeclaringSourcePart(getClass()));
      assertContains(expected.getMessage(), "1 error");
    }

    // passes because duplicates are ignored
    injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(String[].class).toInstance(strings);
        bind(new TypeLiteral<String[]>() {}).toInstance(strings);
      }
    });
    assertSame(strings, injector.getInstance(Key.get(new TypeLiteral<String[]>() {})));
    assertSame(strings, injector.getInstance(new Key<String[]>() {}));
    assertSame(strings, injector.getInstance(String[].class));
  }

  static class ParentModule extends AbstractModule {
    @Override protected void configure() {
      install(new FooModule());
      install(new BarModule());
    }
  }
  static class FooModule extends AbstractModule {
    @Override protected void configure() {
      install(new ConstantModule("foo"));
    }
  }
  static class BarModule extends AbstractModule {
    @Override protected void configure() {
      install(new ConstantModule("bar"));
    }
  }
  static class ConstantModule extends AbstractModule {
    private final String constant;
    ConstantModule(String constant) {
      this.constant = constant;
    }
    @Override protected void configure() {
      bind(String.class).toInstance(constant);
    }
  }

  /**
   * Binding something to two different things should give an error.
   */
  public void testSettingBindingTwice() {
    try {
      Guice.createInjector(new ParentModule());
      fail();
    } catch(CreationException expected) {
      assertContains(expected.getMessage(),
        "1) A binding to java.lang.String was already configured at " + ConstantModule.class.getName(),
        asModuleChain(ParentModule.class, FooModule.class, ConstantModule.class),
        "at " + ConstantModule.class.getName(), getDeclaringSourcePart(getClass()),
        asModuleChain(ParentModule.class, BarModule.class, ConstantModule.class));
      assertContains(expected.getMessage(), "1 error");
    }
  }

  /**
   * Binding an @ImplementedBy thing to something else should also fail.
   */
  public void testSettingAtImplementedByTwice() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(HasImplementedBy1.class);
          bind(HasImplementedBy1.class).toInstance(new HasImplementedBy1() {});
        }
      });
      fail();
    } catch(CreationException expected) {
      expected.printStackTrace();
      assertContains(expected.getMessage(),
        "1) A binding to " + HasImplementedBy1.class.getName()
        + " was already configured at " + getClass().getName(),
        "at " + getClass().getName(), getDeclaringSourcePart(getClass()));
      assertContains(expected.getMessage(), "1 error");
    }
  }

  /**
   * See issue 614, Problem One
   * https://github.com/google/guice/issues/614
   */
  public void testJitDependencyDoesntBlockOtherExplicitBindings() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(HasImplementedByThatNeedsAnotherImplementedBy.class);
        bind(HasImplementedBy1.class).toInstance(new HasImplementedBy1() {});
      }
    });
    injector.getAllBindings(); // just validate it doesn't throw.
    // Also validate that we're using the explicit (and not @ImplementedBy) implementation
    assertFalse(injector.getInstance(HasImplementedBy1.class) instanceof ImplementsHasImplementedBy1);
  }

  /**
   * See issue 614, Problem Two
   * https://github.com/google/guice/issues/id=614
   */
  public void testJitDependencyCanUseExplicitDependencies() {
    Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(HasImplementedByThatWantsExplicit.class);
        bind(JustAnInterface.class).toInstance(new JustAnInterface() {});
      }
    });
  }

  /**
   * Untargetted bindings should follow @ImplementedBy and @ProvidedBy
   * annotations if they exist. Otherwise the class should be constructed
   * directly.
   */
  public void testUntargettedBinding() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(HasProvidedBy1.class);
        bind(HasImplementedBy1.class);
        bind(HasProvidedBy2.class);
        bind(HasImplementedBy2.class);
        bind(JustAClass.class);
      }
    });

    assertNotNull(injector.getInstance(HasProvidedBy1.class));
    assertNotNull(injector.getInstance(HasImplementedBy1.class));
    assertNotSame(HasProvidedBy2.class,
        injector.getInstance(HasProvidedBy2.class).getClass());
    assertSame(ExtendsHasImplementedBy2.class,
        injector.getInstance(HasImplementedBy2.class).getClass());
    assertSame(JustAClass.class, injector.getInstance(JustAClass.class).getClass());
  }

  public void testPartialInjectorGetInstance() {
    Injector injector = Guice.createInjector();
    try {
      injector.getInstance(MissingParameter.class);
      fail();
    } catch (ConfigurationException expected) {
      assertContains(expected.getMessage(),
          "1) Could not find a suitable constructor in " + NoInjectConstructor.class.getName(),
          "for the 1st parameter of " + MissingParameter.class.getName() 
              + ".<init>(BinderTest.java:");
    }
  }

  public void testUserReportedError() {
    final Message message = new Message(getClass(), "Whoops!");
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          addError(message);
        }
      });
      fail();
    } catch (CreationException expected) {
      assertSame(message, Iterables.getOnlyElement(expected.getErrorMessages()));
    }
  }

  public void testUserReportedErrorsAreAlsoLogged() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          addError(new Message("Whoops!", new IllegalArgumentException()));
        }
      });
      fail();
    } catch (CreationException expected) {
    }

    LogRecord logRecord = Iterables.getOnlyElement(this.logRecords);
    assertContains(logRecord.getMessage(),
        "An exception was caught and reported. Message: java.lang.IllegalArgumentException");
  }

  public void testBindingToProvider() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(new TypeLiteral<Provider() {}).toInstance(Providers.of("A"));
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Binding to Provider is not allowed.",
          "at " + BinderTest.class.getName(), getDeclaringSourcePart(getClass()));
    }
  }

  static class OuterCoreModule extends AbstractModule {
    @Override protected void configure() {
      install(new InnerCoreModule());
    }
  }
  static class InnerCoreModule extends AbstractModule {
    final Named red = Names.named("red");

    @Override protected void configure() {
      bind(AbstractModule.class).annotatedWith(red)
      .toProvider(Providers.<AbstractModule>of(null));
      bind(Binder.class).annotatedWith(red).toProvider(Providers.<Binder>of(null));
      bind(Binding.class).annotatedWith(red).toProvider(Providers.<Binding>of(null));
      bind(Injector.class).annotatedWith(red).toProvider(Providers.<Injector>of(null));
      bind(Key.class).annotatedWith(red).toProvider(Providers.<Key>of(null));
      bind(Module.class).annotatedWith(red).toProvider(Providers.<Module>of(null));
      bind(Provider.class).annotatedWith(red).toProvider(Providers.<Provider>of(null));
      bind(Scope.class).annotatedWith(red).toProvider(Providers.<Scope>of(null));
      bind(Stage.class).annotatedWith(red).toProvider(Providers.<Stage>of(null));
      bind(TypeLiteral.class).annotatedWith(red).toProvider(Providers.<TypeLiteral>of(null));
      bind(new TypeLiteral<Key() {}).toProvider(Providers.>of(null));
    }
  }
  public void testCannotBindToGuiceTypes() {
    try {
      Guice.createInjector(new OuterCoreModule());
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "Binding to core guice framework type is not allowed: AbstractModule.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Binder.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Binding.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Injector.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Key.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Module.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to Provider is not allowed.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Scope.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Stage.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: TypeLiteral.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class),

          "Binding to core guice framework type is not allowed: Key.",
          "at " + InnerCoreModule.class.getName() + getDeclaringSourcePart(getClass()),
          asModuleChain(OuterCoreModule.class, InnerCoreModule.class));
    }
  }

  static class MissingParameter {
    @Inject MissingParameter(NoInjectConstructor noInjectConstructor) {}
  }

  static class NoInjectConstructor {
    private NoInjectConstructor() {}
  }

  @ProvidedBy(HasProvidedBy1Provider.class)
  interface HasProvidedBy1 {}

  static class HasProvidedBy1Provider implements Provider<HasProvidedBy1> {
    public HasProvidedBy1 get() {
      return new HasProvidedBy1() {};
    }
  }

  @ImplementedBy(ImplementsHasImplementedBy1.class)
  interface HasImplementedBy1 {}

  static class ImplementsHasImplementedBy1 implements HasImplementedBy1 {}

  @ProvidedBy(HasProvidedBy2Provider.class)
  static class HasProvidedBy2 {}

  static class HasProvidedBy2Provider implements Provider<HasProvidedBy2> {
    public HasProvidedBy2 get() {
      return new HasProvidedBy2() {};
    }
  }

  @ImplementedBy(ExtendsHasImplementedBy2.class)
  static class HasImplementedBy2 {}

  static class ExtendsHasImplementedBy2 extends HasImplementedBy2 {}

  static class JustAClass {}

  @ImplementedBy(ImplementsHasImplementedByThatNeedsAnotherImplementedBy.class)
  static interface HasImplementedByThatNeedsAnotherImplementedBy {
  }

  static class ImplementsHasImplementedByThatNeedsAnotherImplementedBy
    implements HasImplementedByThatNeedsAnotherImplementedBy {
    @Inject
    ImplementsHasImplementedByThatNeedsAnotherImplementedBy(
        HasImplementedBy1 h1n1) {}
  }

  @ImplementedBy(ImplementsHasImplementedByThatWantsExplicit.class)
  static interface HasImplementedByThatWantsExplicit {
  }

  static class ImplementsHasImplementedByThatWantsExplicit
      implements HasImplementedByThatWantsExplicit {
    @Inject ImplementsHasImplementedByThatWantsExplicit(JustAnInterface jai) {}
  }

  static interface JustAnInterface {}


//  public void testBindInterfaceWithoutImplementation() {
//    Guice.createInjector(new AbstractModule() {
//      protected void configure() {
//        bind(Runnable.class);
//      }
//    }).getInstance(Runnable.class);
//  }

  enum Roshambo { ROCK, SCISSORS, PAPER }

  public void testInjectRawProvider() {
    try {
      Guice.createInjector().getInstance(Provider.class);
      fail();
    } catch (ConfigurationException expected) {
      Asserts.assertContains(expected.getMessage(),
          "1) Cannot inject a Provider that has no type parameter",
          "while locating " + Provider.class.getName());
    }
  }
}

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