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Java example source code file (PrivateModuleTest.java)

This example Java source code file (PrivateModuleTest.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, exposed, injector, manyprivatemodules, named, override, privatebinder, privatemodule, provides, string, unable, util

The PrivateModuleTest.java Java example source code

/**
 * Copyright (C) 2008 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.getDeclaringSourcePart;
import static com.google.inject.name.Names.named;

import com.google.common.collect.ImmutableSet;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.ExposedBinding;
import com.google.inject.spi.PrivateElements;
import com.google.inject.util.Types;

import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * @author jessewilson@google.com (Jesse Wilson)
 */
public class PrivateModuleTest extends TestCase {

  public void testBasicUsage() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override protected void configure() {
        bind(String.class).annotatedWith(named("a")).toInstance("public");

        install(new PrivateModule() {
          @Override public void configure() {
            bind(String.class).annotatedWith(named("b")).toInstance("i");

            bind(AB.class).annotatedWith(named("one")).to(AB.class);
            expose(AB.class).annotatedWith(named("one"));
          }
        });

        install(new PrivateModule() {
          @Override public void configure() {
            bind(String.class).annotatedWith(named("b")).toInstance("ii");

            bind(AB.class).annotatedWith(named("two")).to(AB.class);
            expose(AB.class).annotatedWith(named("two"));
          }
        });
      }
    });

    AB ab1 = injector.getInstance(Key.get(AB.class, named("one")));
    assertEquals("public", ab1.a);
    assertEquals("i", ab1.b);

    AB ab2 = injector.getInstance(Key.get(AB.class, named("two")));
    assertEquals("public", ab2.a);
    assertEquals("ii", ab2.b);
  }
  
  public void testWithoutPrivateModules() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override protected void configure() {
        PrivateBinder bindA = binder().newPrivateBinder();
        bindA.bind(String.class).annotatedWith(named("a")).toInstance("i");
        bindA.expose(String.class).annotatedWith(named("a"));
        bindA.bind(String.class).annotatedWith(named("c")).toInstance("private to A");

        PrivateBinder bindB = binder().newPrivateBinder();
        bindB.bind(String.class).annotatedWith(named("b")).toInstance("ii");
        bindB.expose(String.class).annotatedWith(named("b"));
        bindB.bind(String.class).annotatedWith(named("c")).toInstance("private to B");
      }
    });

    assertEquals("i", injector.getInstance(Key.get(String.class, named("a"))));
    assertEquals("ii", injector.getInstance(Key.get(String.class, named("b"))));
  }

  public void testMisplacedExposedAnnotation() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {}

        @Provides @Exposed
        String provideString() {
          return "i";
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), "Cannot expose java.lang.String on a standard binder. ",
          "Exposed bindings are only applicable to private binders.",
          " at " + PrivateModuleTest.class.getName(), "provideString(PrivateModuleTest.java:");
    }
  }

  public void testMisplacedExposeStatement() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          ((PrivateBinder) binder()).expose(String.class).annotatedWith(named("a"));
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), "Cannot expose java.lang.String on a standard binder. ",
          "Exposed bindings are only applicable to private binders.",
          " at " + PrivateModuleTest.class.getName(), getDeclaringSourcePart(getClass()));
    }
  }

  public void testPrivateModulesAndProvidesMethods() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override protected void configure() {
        install(new PrivateModule() {
          @Override public void configure() {
            expose(String.class).annotatedWith(named("a"));
          }

          @Provides @Named("a") String providePublicA() {
            return "i";
          }

          @Provides @Named("b") String providePrivateB() {
            return "private";
          }
        });

        install(new PrivateModule() {
          @Override public void configure() {}

          @Provides @Named("c") String providePrivateC() {
            return "private";
          }

          @Provides @Exposed @Named("d") String providePublicD() {
            return "ii";
          }
        });
      }
    });

    assertEquals("i", injector.getInstance(Key.get(String.class, named("a"))));

    try {
      injector.getInstance(Key.get(String.class, named("b")));
      fail();
    } catch(ConfigurationException expected) {
    }

    try {
      injector.getInstance(Key.get(String.class, named("c")));
      fail();
    } catch(ConfigurationException expected) {
    }

    assertEquals("ii", injector.getInstance(Key.get(String.class, named("d"))));
  }

  public void testCannotBindAKeyExportedByASibling() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          install(new PrivateModule() {
            @Override public void configure() {
              bind(String.class).toInstance("public");
              expose(String.class);
            }
          });

          install(new PrivateModule() {
            @Override public void configure() {
              bind(String.class).toInstance("private");
            }
          });
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "A binding to java.lang.String was already configured at ",
          getClass().getName(), getDeclaringSourcePart(getClass()),
          " at " + getClass().getName(), getDeclaringSourcePart(getClass()));
    }
  }

  public void testExposeButNoBind() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(String.class).annotatedWith(named("a")).toInstance("a");
          bind(String.class).annotatedWith(named("b")).toInstance("b");

          install(new PrivateModule() {
            @Override public void configure() {
              expose(AB.class);
            }
          });
        }
      });
      fail("AB was exposed but not bound");
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "Could not expose() " + AB.class.getName() + ", it must be explicitly bound",
          getDeclaringSourcePart(getClass()));
    }
  }

  /**
   * Ensure that when we've got errors in different private modules, Guice presents all errors
   * in a unified message.
   */
  public void testMessagesFromPrivateModulesAreNicelyIntegrated() {
    try {
      Guice.createInjector(
          new PrivateModule() {
            @Override public void configure() {
              bind(C.class);
            }
          },
          new PrivateModule() {
            @Override public void configure() {
              bind(AB.class);
            }
          }
      );
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) No implementation for " + C.class.getName() + " was bound.",
          "at " + getClass().getName(), getDeclaringSourcePart(getClass()),
          "2) No implementation for " + String.class.getName(), "Named(value=a) was bound.",
          "for field at " + AB.class.getName() + ".a(PrivateModuleTest.java:",
          "3) No implementation for " + String.class.getName(), "Named(value=b) was bound.",
          "for field at " + AB.class.getName() + ".b(PrivateModuleTest.java:",
          "3 errors");
    }
  }

  public void testNestedPrivateInjectors() {
    Injector injector = Guice.createInjector(new PrivateModule() {
      @Override public void configure() {
        expose(String.class);

        install(new PrivateModule() {
          @Override public void configure() {
            bind(String.class).toInstance("nested");
            expose(String.class);
          }
        });
      }
    });

    assertEquals("nested", injector.getInstance(String.class));
  }

  public void testInstallingRegularModulesFromPrivateModules() {
    Injector injector = Guice.createInjector(new PrivateModule() {
      @Override public void configure() {
        expose(String.class);

        install(new AbstractModule() {
          @Override protected void configure() {
            bind(String.class).toInstance("nested");
          }
        });
      }
    });

    assertEquals("nested", injector.getInstance(String.class));
  }

  public void testNestedPrivateModulesWithSomeKeysUnexposed() {
    Injector injector = Guice.createInjector(new PrivateModule() {
      @Override public void configure() {
        bind(String.class).annotatedWith(named("bound outer, exposed outer")).toInstance("boeo");
        expose(String.class).annotatedWith(named("bound outer, exposed outer"));
        bind(String.class).annotatedWith(named("bound outer, exposed none")).toInstance("boen");
        expose(String.class).annotatedWith(named("bound inner, exposed both"));

        install(new PrivateModule() {
          @Override public void configure() {
            bind(String.class).annotatedWith(named("bound inner, exposed both")).toInstance("bieb");
            expose(String.class).annotatedWith(named("bound inner, exposed both"));
            bind(String.class).annotatedWith(named("bound inner, exposed none")).toInstance("bien");
          }
        });
      }
    });

    assertEquals("boeo",
        injector.getInstance(Key.get(String.class, named("bound outer, exposed outer"))));
    assertEquals("bieb",
        injector.getInstance(Key.get(String.class, named("bound inner, exposed both"))));

    try {
      injector.getInstance(Key.get(String.class, named("bound outer, exposed none")));
      fail();
    } catch (ConfigurationException expected) {
    }

    try {
      injector.getInstance(Key.get(String.class, named("bound inner, exposed none")));
      fail();
    } catch (ConfigurationException expected) {
    }
  }

  public void testDependenciesBetweenPrivateAndPublic() {
    Injector injector = Guice.createInjector(
        new PrivateModule() {
          @Override protected void configure() {}

          @Provides @Exposed @Named("a") String provideA() {
            return "A";
          }

          @Provides @Exposed @Named("abc") String provideAbc(@Named("ab") String ab) {
            return ab + "C";
          }
        },
        new AbstractModule() {
          @Override protected void configure() {}

          @Provides @Named("ab") String provideAb(@Named("a") String a) {
            return a + "B";
          }

          @Provides @Named("abcd") String provideAbcd(@Named("abc") String abc) {
            return abc + "D";
          }
        }
    );

    assertEquals("ABCD", injector.getInstance(Key.get(String.class, named("abcd"))));
  }

  public void testDependenciesBetweenPrivateAndPublicWithPublicEagerSingleton() {
    Injector injector = Guice.createInjector(
        new PrivateModule() {
          @Override protected void configure() {}

          @Provides @Exposed @Named("a") String provideA() {
            return "A";
          }

          @Provides @Exposed @Named("abc") String provideAbc(@Named("ab") String ab) {
            return ab + "C";
          }
        },
        new AbstractModule() {
          @Override protected void configure() {
            bind(String.class).annotatedWith(named("abcde")).toProvider(new Provider<String>() {
              @Inject @Named("abcd") String abcd;

              public String get() {
                return abcd + "E";
              }
            }).asEagerSingleton();
          }

          @Provides @Named("ab") String provideAb(@Named("a") String a) {
            return a + "B";
          }

          @Provides @Named("abcd") String provideAbcd(@Named("abc") String abc) {
            return abc + "D";
          }
        }
    );

    assertEquals("ABCDE", injector.getInstance(Key.get(String.class, named("abcde"))));
  }

  public void testDependenciesBetweenPrivateAndPublicWithPrivateEagerSingleton() {
    Injector injector = Guice.createInjector(
        new AbstractModule() {
          @Override protected void configure() {}

          @Provides @Named("ab") String provideAb(@Named("a") String a) {
            return a + "B";
          }

          @Provides @Named("abcd") String provideAbcd(@Named("abc") String abc) {
            return abc + "D";
          }
        },
        new PrivateModule() {
          @Override protected void configure() {
            bind(String.class).annotatedWith(named("abcde")).toProvider(new Provider<String>() {
              @Inject @Named("abcd") String abcd;

              public String get() {
                return abcd + "E";
              }
            }).asEagerSingleton();
            expose(String.class).annotatedWith(named("abcde"));
          }

          @Provides @Exposed @Named("a") String provideA() {
            return "A";
          }

          @Provides @Exposed @Named("abc") String provideAbc(@Named("ab") String ab) {
            return ab + "C";
          }
        }
    );

    assertEquals("ABCDE", injector.getInstance(Key.get(String.class, named("abcde"))));
  }

  static class AB {
    @Inject @Named("a") String a;
    @Inject @Named("b") String b;
  }

  interface C {}

  public void testSpiAccess() {
    Injector injector = Guice.createInjector(new PrivateModule() {
          @Override public void configure() {
            bind(String.class).annotatedWith(named("a")).toInstance("private");
            bind(String.class).annotatedWith(named("b")).toInstance("exposed");
            expose(String.class).annotatedWith(named("b"));
          }
        });

    ExposedBinding<?> binding
        = (ExposedBinding<?>) injector.getBinding(Key.get(String.class, Names.named("b")));
    assertEquals(ImmutableSet.<Dependencyof(Dependency.get(Key.get(Injector.class))),
        binding.getDependencies());
    PrivateElements privateElements = binding.getPrivateElements();
    assertEquals(ImmutableSet.<Keyof(Key.get(String.class, named("b"))),
        privateElements.getExposedKeys());
    assertContains(privateElements.getExposedSource(Key.get(String.class, named("b"))).toString(),
        PrivateModuleTest.class.getName(), getDeclaringSourcePart(getClass()));
    Injector privateInjector = privateElements.getInjector();
    assertEquals("private", privateInjector.getInstance(Key.get(String.class, Names.named("a"))));
  }
  
  public void testParentBindsSomethingInPrivate() {
    try {
      Guice.createInjector(new FailingModule());
      fail();
    } catch(CreationException expected) {
      assertEquals(1, expected.getErrorMessages().size());
      assertContains(expected.toString(),
          "Unable to create binding for java.util.List.",
          "It was already configured on one or more child injectors or private modules",
          "bound at " + FailingPrivateModule.class.getName() + ".configure(",
          asModuleChain(FailingModule.class, ManyPrivateModules.class, FailingPrivateModule.class),
          "bound at " + SecondFailingPrivateModule.class.getName() + ".configure(",
          asModuleChain(
              FailingModule.class, ManyPrivateModules.class, SecondFailingPrivateModule.class),
          "If it was in a PrivateModule, did you forget to expose the binding?",
          "at " + FailingModule.class.getName() + ".configure(");
    }
  }
  
  public void testParentBindingToPrivateLinkedJitBinding() {
    Injector injector = Guice.createInjector(new ManyPrivateModules());
    try {
      injector.getBinding(Key.get(Types.providerOf(List.class)));
      fail();
    } catch(ConfigurationException expected) {
      assertEquals(1, expected.getErrorMessages().size());
      assertContains(expected.toString(),
          "Unable to create binding for com.google.inject.Provider<java.util.List>.",
          "It was already configured on one or more child injectors or private modules",
          "bound at " + FailingPrivateModule.class.getName() + ".configure(",
          asModuleChain(ManyPrivateModules.class, FailingPrivateModule.class),
          "bound at " + SecondFailingPrivateModule.class.getName() + ".configure(",
          asModuleChain(ManyPrivateModules.class, SecondFailingPrivateModule.class),
          "If it was in a PrivateModule, did you forget to expose the binding?",
          "while locating com.google.inject.Provider<java.util.List>");
    }
  }
  
  public void testParentBindingToPrivateJitBinding() {
    Injector injector = Guice.createInjector(new ManyPrivateModules());
    try {
      injector.getBinding(PrivateFoo.class);
      fail();
    } catch(ConfigurationException expected) {
      assertEquals(1, expected.getErrorMessages().size());
      assertContains(expected.toString(),
          "Unable to create binding for " + PrivateFoo.class.getName(),
          "It was already configured on one or more child injectors or private modules",
          "(bound by a just-in-time binding)",
          "If it was in a PrivateModule, did you forget to expose the binding?",
          "while locating " + PrivateFoo.class.getName());
    }
  }

  private static class FailingModule extends AbstractModule {
    @Override protected void configure() {
      bind(Collection.class).to(List.class);
      install(new ManyPrivateModules());
    }
  }

  private static class ManyPrivateModules extends AbstractModule {
    @Override protected void configure() {
      // make sure duplicate sources are collapsed
      install(new FailingPrivateModule());
      install(new FailingPrivateModule());
      // but additional sources are listed
      install(new SecondFailingPrivateModule());
    }
  }

  private static class FailingPrivateModule extends PrivateModule {
    @Override protected void configure() {
      bind(List.class).toInstance(new ArrayList());
      
      // Add the Provider<List> binding, created just-in-time,
      // to make sure our linked JIT bindings have the correct source.
      getProvider(Key.get(Types.providerOf(List.class)));
      
      // Request a JIT binding for PrivateFoo, which can only
      // be created in the private module because it depends
      // on List.
      getProvider(PrivateFoo.class);
    }
  }
  
  /** A second class, so we can see another name in the source list. */
  private static class SecondFailingPrivateModule extends PrivateModule {
    @Override protected void configure() {
      bind(List.class).toInstance(new ArrayList());
      
      // Add the Provider<List> binding, created just-in-time,
      // to make sure our linked JIT bindings have the correct source.
      getProvider(Key.get(Types.providerOf(List.class)));
      
      // Request a JIT binding for PrivateFoo, which can only
      // be created in the private module because it depends
      // on List.
      getProvider(PrivateFoo.class);
    }
  }
  
  private static class PrivateFoo {
    @Inject List list;
  } 
}

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