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Java example source code file (JitBindingsTest.java)

This example Java source code file (JitBindingsTest.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, allow_binding, class, creationexception, fail_all, foo, fooimpl, injector, override, privatemodule, provider, string, suppresswarnings, util, wantstypeliterals

The JitBindingsTest.java Java example source code

/*
 * Copyright (C) 2010 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.common.collect.ImmutableSet.of;
import static com.google.inject.Asserts.assertContains;
import static com.google.inject.JitBindingsTest.GetBindingCheck.ALLOW_BINDING;
import static com.google.inject.JitBindingsTest.GetBindingCheck.FAIL_ALL;

import junit.framework.TestCase;

import java.util.Set;

/**
 * Some tests for {@link Binder#requireExplicitBindings()}
 * 
 * @author sberlin@gmail.com (Sam Berlin)
 */
public class JitBindingsTest extends TestCase {
  
  private String jitFailed(Class<?> clazz) {
    return jitFailed(TypeLiteral.get(clazz));
  }
  
  private String jitFailed(TypeLiteral<?> clazz) {
    return "Explicit bindings are required and " + clazz + " is not explicitly bound.";
  }

  private String jitInParentFailed(Class<?> clazz) {
    return jitInParentFailed(TypeLiteral.get(clazz));
  }

  private String jitInParentFailed(TypeLiteral<?> clazz) {
    return "Explicit bindings are required and " + clazz + " would be bound in a parent injector.";
  }
  
  private String inChildMessage(Class<?> clazz) {
    return "Unable to create binding for "
        + clazz.getName()
        + ". It was already configured on one or more child injectors or private modules";
  }
  
  public void testLinkedBindingWorks() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(FooImpl.class);
      }
    });
    // Foo was explicitly bound
    ensureWorks(injector, Foo.class);
    // FooImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding
    ensureFails(injector, ALLOW_BINDING, FooImpl.class);
  }
  
  public void testMoreBasicsWork() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(FooImpl.class);
        bind(Bar.class);
        bind(FooBar.class);
      }
    });
    // Foo, Bar & FooBar was explicitly bound    
    ensureWorks(injector, FooBar.class, Bar.class, Foo.class);
    // FooImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding    
    ensureFails(injector, ALLOW_BINDING,  FooImpl.class);    
  }
  
  public void testLinkedEagerSingleton() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(FooImpl.class).asEagerSingleton();
      }
    });
    // Foo was explicitly bound
    ensureWorks(injector, Foo.class);
    // FooImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding
    ensureFails(injector, ALLOW_BINDING, FooImpl.class);
  }
  
  public void testBasicsWithEagerSingleton() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(FooImpl.class).asEagerSingleton();
        bind(Bar.class);
        bind(FooBar.class);
      }
    });
    // Foo, Bar & FooBar was explicitly bound    
    ensureWorks(injector, FooBar.class, Bar.class, Foo.class);
    // FooImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding    
    ensureFails(injector, ALLOW_BINDING,  FooImpl.class);    
  }  
  
  public void testLinkedToScoped() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder.requireExplicitBindings();
        bind(Foo.class).to(ScopedFooImpl.class);
      }
    });
    // Foo was explicitly bound
    ensureWorks(injector, Foo.class);
    // FooSingletonImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding
    ensureFails(injector, ALLOW_BINDING, ScopedFooImpl.class);    
  }
  
  public void testBasicsWithScoped() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(ScopedFooImpl.class);
        bind(Bar.class);
        bind(FooBar.class);
      }
    });
    // Foo, Bar & FooBar was explicitly bound    
    ensureWorks(injector, FooBar.class, Bar.class, Foo.class);
    // FooSingletonImpl was implicitly bound, it is an error to call getInstance or getProvider,
    // It is OK to call getBinding for introspection, but an error to get the provider
    // of the binding    
    ensureFails(injector, ALLOW_BINDING,  ScopedFooImpl.class);   
  }
  
  public void testFailsIfInjectingScopedDirectlyWhenItIsntBound() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireExplicitBindings();
          bind(Foo.class).to(ScopedFooImpl.class);
          bind(WantsScopedFooImpl.class);
        }
      });
      fail();
    } catch(CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(ScopedFooImpl.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }
  
  public void testLinkedProviderBindingWorks() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).toProvider(FooProvider.class);
      }
    });
    // Foo was explicitly bound
    ensureWorks(injector, Foo.class);
    // FooImpl was not bound at all (even implicitly), it is an error
    // to call getInstance, getProvider, or getBinding.
    ensureFails(injector, FAIL_ALL, FooImpl.class);
  }
  
  public void testJitGetFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
         binder().requireExplicitBindings(); 
        }
      }).getInstance(Bar.class);
      fail("should have failed");
    } catch(ConfigurationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }
  
  public void testJitInjectionFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireExplicitBindings();
          bind(Foo.class).to(FooImpl.class);
          bind(FooBar.class);
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testJitProviderGetFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireExplicitBindings(); 
        }
      }).getProvider(Bar.class);
      fail("should have failed");
    } catch (ConfigurationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testJitProviderInjectionFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireExplicitBindings();
          bind(Foo.class).to(FooImpl.class);
          bind(ProviderFooBar.class);
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }
  
  public void testImplementedBy() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(ImplBy.class);
      }
    });
    ensureWorks(injector, ImplBy.class);
    ensureFails(injector, ALLOW_BINDING, ImplByImpl.class);
  }
  
  public void testImplementedBySomethingThatIsAnnotated() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(ImplByScoped.class);
      }
    });
    ensureWorks(injector, ImplByScoped.class);
    ensureFails(injector, ALLOW_BINDING, ImplByScopedImpl.class);    
  }
  
  public void testProvidedBy() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(ProvBy.class);
      }
    });
    ensureWorks(injector, ProvBy.class);
    ensureFails(injector, ALLOW_BINDING, ProvByProvider.class);
  }
  
  public void testProviderMethods() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override protected void configure() {
        binder().requireExplicitBindings();
      }
      @SuppressWarnings("unused") @Provides Foo foo() { return new FooImpl(); }
    });
    ensureWorks(injector, Foo.class);
  }
  
  public void testChildInjectorInheritsOption() {
    Injector parent = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Bar.class);
      }
    });
    ensureWorks(parent, Bar.class);
    ensureFails(parent, FAIL_ALL, FooImpl.class, FooBar.class, Foo.class);
    
    try {
      parent.createChildInjector(new AbstractModule() {
        @Override
        protected void configure() {
          bind(FooBar.class);
        }
      });
      fail("should have failed");
    } catch(CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Foo.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
    
    Injector child = parent.createChildInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Foo.class).to(FooImpl.class);
      }
    });
    ensureWorks(child, Foo.class, Bar.class);
    ensureFails(child, ALLOW_BINDING, FooImpl.class);
    ensureInChild(parent, FooImpl.class, Foo.class);
    // TODO(sameb): FooBar may or may not be in a child injector, depending on if GC has run.
    // We should fix failed child injectors to remove their contents from the parent blacklist
    // immediately, rather than waiting on GC to do it.
    // FooBar was succesfully inserted into the child injector (and parent blacklist), but then
    // JIT bindings it depended on failed, making the child injector invalid.

    Injector grandchild = child.createChildInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(FooBar.class);
      }
    });
    ensureWorks(grandchild, FooBar.class, Foo.class, Bar.class);
    ensureFails(grandchild, ALLOW_BINDING, FooImpl.class);
    ensureFails(child, ALLOW_BINDING, FooImpl.class);
    ensureInChild(parent, FooImpl.class, FooBar.class, Foo.class);
  }
  
  public void testChildInjectorAddsOption() {
    Injector parent = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Bar.class);
      }
    });
    int totalParentBindings = parent.getAllBindings().size();
    
    try {
      parent.createChildInjector(new AbstractModule() {
        @Override
        protected void configure() {
          binder().requireExplicitBindings();
          bind(FooBar.class);
        }
      });
      fail("should have failed");
    } catch(CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Foo.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
    assertEquals(totalParentBindings, parent.getAllBindings().size());
    
    Injector child = parent.createChildInjector(new AbstractModule() {
      @Override
      protected void configure() {
        binder().requireExplicitBindings();
        bind(Foo.class).to(FooImpl.class);
        bind(FooImpl.class);
      }
    });
    assertEquals(totalParentBindings, parent.getAllBindings().size());
    ensureWorks(child, Foo.class, Bar.class);
    
    Injector grandchild = child.createChildInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(FooBar.class);
      }
    });
    assertEquals(totalParentBindings, parent.getAllBindings().size());    
    ensureWorks(grandchild, FooBar.class, Foo.class, Bar.class);
    
    // Make sure siblings of children don't inherit each others settings...
    // a new child should be able to get FooImpl.
    child = parent.createChildInjector();
    ensureWorks(child, FooImpl.class);
  }

  public void testPrivateModulesInheritOptions() {
    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          binder().requireExplicitBindings();
          bind(Foo.class).to(FooImpl.class);
  
          install(new PrivateModule() {
            public void configure() {
              bind(FooBar.class);
              expose(FooBar.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch(CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
    
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        binder().requireExplicitBindings();

        install(new PrivateModule() {
          public void configure() {
            bind(Foo.class).to(FooImpl.class);
            expose(Foo.class);
          }
        });
      }
    });
    ensureInChild(injector, FooImpl.class);
  }
  
  public void testPrivateModuleAddsOption() {
    try {
      Guice.createInjector(new AbstractModule() {
        protected void configure() {
          bind(Foo.class).to(FooImpl.class);
  
          // Fails because FooBar is in the private module,
          // and it wants Bar, but Bar would be JIT.
          install(new PrivateModule() {
            public void configure() {
              binder().requireExplicitBindings();
              bind(FooBar.class);
              expose(FooBar.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch(CreationException expected) {
      assertContains(expected.getMessage(), jitFailed(Bar.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testPrivateModuleSiblingsDontShareOption() {
    Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(Foo.class).to(FooImpl.class);

        install(new PrivateModule() {
          public void configure() {
            binder().requireExplicitBindings();
          }
        });

        // This works, even though Bar is JIT,
        // because the requireExplicitBindings isn't shared
        // between sibling private modules.
        install(new PrivateModule() {
          public void configure() {
            bind(FooBar.class);
            expose(FooBar.class);
          }
        });
      }
    });
  }  

  public void testTypeLiteralsCanBeInjected() {
    Injector injector = Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          binder().requireExplicitBindings();
          bind(new TypeLiteral<WantsTypeLiterals() {});
          bind(new TypeLiteral<Set() {}).toInstance(of("bar"));
        }
      });

    WantsTypeLiterals<String> foo = injector.getInstance(new Key>() {});
    assertEquals(foo.literal.getRawType(), String.class);
    assertEquals(of("bar"), foo.set);
  }
  
  public void testMembersInjectorsCanBeInjected() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override protected void configure() {
        binder().requireExplicitBindings();
      }
      
      @Provides String data(MembersInjector<String> mi) {
        String data = "foo";
        mi.injectMembers(data);
        return data;
      }
    });

    String data = injector.getInstance(String.class);
    assertEquals("foo", data);
  }

  public void testJitLinkedBindingInParentFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new PrivateModule() {
            @Override
            protected void configure() {
              binder().requireExplicitBindings();
              bind(Foo.class).to(FooImpl.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitInParentFailed(FooImpl.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testJitProviderBindingInParentFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new PrivateModule() {
            @Override
            protected void configure() {
              binder().requireExplicitBindings();
              bind(Foo.class).toProvider(FooProvider.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitInParentFailed(FooProvider.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testJitImplementedByBindingInParentFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new PrivateModule() {
            @Override
            protected void configure() {
              binder().requireExplicitBindings();
              bind(ImplBy.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitInParentFailed(ImplByImpl.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  public void testJitProvidedByBindingInParentFails() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new PrivateModule() {
            @Override
            protected void configure() {
              binder().requireExplicitBindings();
              bind(ProvBy.class);
            }
          });
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), jitInParentFailed(ProvByProvider.class));
      assertEquals(1, expected.getErrorMessages().size());
    }
  }

  private void ensureWorks(Injector injector, Class<?>... classes) {
    for(int i = 0; i < classes.length; i++) {
      injector.getInstance(classes[i]);
      injector.getProvider(classes[i]).get();
      injector.getBinding(classes[i]).getProvider().get();
    }
  }
  
  enum GetBindingCheck { FAIL_ALL, ALLOW_BINDING, ALLOW_BINDING_PROVIDER }
  private void ensureFails(Injector injector, GetBindingCheck getBinding, Class<?>... classes) {
    for(int i = 0; i < classes.length; i++) {      
      try { 
        injector.getInstance(classes[i]);
        fail("should have failed tring to retrieve class: " + classes[i]);
      } catch(ConfigurationException expected) {
        assertContains(expected.getMessage(), jitFailed(classes[i]));
        assertEquals(1, expected.getErrorMessages().size());
      }
      
      try { 
        injector.getProvider(classes[i]);
        fail("should have failed tring to retrieve class: " + classes[i]);
      } catch(ConfigurationException expected) {
        assertContains(expected.getMessage(), jitFailed(classes[i]));
        assertEquals(1, expected.getErrorMessages().size());
      }
      
      if (getBinding == GetBindingCheck.ALLOW_BINDING
          || getBinding == GetBindingCheck.ALLOW_BINDING_PROVIDER) {
        Binding<?> binding = injector.getBinding(classes[i]);
        try {
          binding.getProvider();
          if (getBinding != GetBindingCheck.ALLOW_BINDING_PROVIDER) {
            fail("should have failed trying to retrieve class: " + classes[i]);
          }
        } catch(ConfigurationException expected) {
          if (getBinding == GetBindingCheck.ALLOW_BINDING_PROVIDER) {
            throw expected;
          }
          assertContains(expected.getMessage(), jitFailed(classes[i]));
          assertEquals(1, expected.getErrorMessages().size());
        }
      } else {
        try {
          injector.getBinding(classes[i]);
          fail("should have failed tring to retrieve class: " + classes[i]);          
        } catch(ConfigurationException expected) {
          assertContains(expected.getMessage(), jitFailed(classes[i]));
          assertEquals(1, expected.getErrorMessages().size());
        }
      }
    }
  }
  
  private void ensureInChild(Injector injector, Class<?>... classes) {
    for(int i = 0; i < classes.length; i++) {      
      try { 
        injector.getInstance(classes[i]);
        fail("should have failed tring to retrieve class: " + classes[i]);
      } catch(ConfigurationException expected) {
        assertContains(expected.getMessage(), inChildMessage(classes[i]));
        assertEquals(1, expected.getErrorMessages().size());
      }
      
      try { 
        injector.getProvider(classes[i]);
        fail("should have failed tring to retrieve class: " + classes[i]);
      } catch(ConfigurationException expected) {
        assertContains(expected.getMessage(), inChildMessage(classes[i]));
        assertEquals(1, expected.getErrorMessages().size());
      }
      
      try {
        injector.getBinding(classes[i]);
        fail("should have failed tring to retrieve class: " + classes[i]);          
      } catch(ConfigurationException expected) {
        assertContains(expected.getMessage(), inChildMessage(classes[i]));
        assertEquals(1, expected.getErrorMessages().size());
      }
    }
  }
  
  private static interface Foo {}
  private static class FooImpl implements Foo {}
  @Singleton private static class ScopedFooImpl implements Foo {}
  private static class WantsScopedFooImpl {
    @SuppressWarnings("unused") @Inject ScopedFooImpl scopedFoo;
  }
  private static class Bar {}
  private static class FooBar {
    @SuppressWarnings("unused") @Inject Foo foo;
    @SuppressWarnings("unused") @Inject Bar bar;
  }
  private static class ProviderFooBar {
    @SuppressWarnings("unused") @Inject Provider<Foo> foo;
    @SuppressWarnings("unused") @Inject Provider<Bar> bar;
  }
  private static class FooProvider implements Provider<Foo> {
    public Foo get() {
      return new FooImpl();
    }
  }

  @ImplementedBy(ImplByImpl.class)
  private static interface ImplBy {}
  private static class ImplByImpl implements ImplBy {}
  
  @ImplementedBy(ImplByScopedImpl.class)
  private static interface ImplByScoped {}
  @Singleton
  private static class ImplByScopedImpl implements ImplByScoped {}  

  @ProvidedBy(ProvByProvider.class)
  private static interface ProvBy {}
  private static class ProvByProvider implements Provider<ProvBy> {
    public ProvBy get() {
      return new ProvBy() {};
    }
  }
  
  private static class WantsTypeLiterals<T> {
    TypeLiteral<T> literal;
    Set<T> set;
    
    @Inject WantsTypeLiterals(TypeLiteral<T> literal, Set set) {
      this.literal = literal;
      this.set = set;
      
    }
  }
}

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