/**
* 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.multibindings;
import static com.google.inject.Asserts.assertContains;
import static com.google.inject.multibindings.Multibinder.collectionOfJavaxProvidersOf;
import static com.google.inject.multibindings.SpiUtils.VisitType.BOTH;
import static com.google.inject.multibindings.SpiUtils.VisitType.MODULE;
import static com.google.inject.multibindings.SpiUtils.assertSetVisitor;
import static com.google.inject.multibindings.SpiUtils.instance;
import static com.google.inject.multibindings.SpiUtils.providerInstance;
import static com.google.inject.name.Names.named;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import com.google.common.base.Optional;
import com.google.common.base.Predicates;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.inject.AbstractModule;
import com.google.inject.Binding;
import com.google.inject.BindingAnnotation;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.Provides;
import com.google.inject.ProvisionException;
import com.google.inject.Scopes;
import com.google.inject.Stage;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.Element;
import com.google.inject.spi.Elements;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InstanceBinding;
import com.google.inject.spi.LinkedKeyBinding;
import com.google.inject.util.Modules;
import com.google.inject.util.Providers;
import com.google.inject.util.Types;
import junit.framework.TestCase;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/**
* @author jessewilson@google.com (Jesse Wilson)
*/
public class MultibinderTest extends TestCase {
final TypeLiteral<Optional<String>> optionalOfString =
new TypeLiteral<Optional<String>>() {};
final TypeLiteral<Map<String, String>> mapOfStringString =
new TypeLiteral<Map<String, String>>() {};
final TypeLiteral<Set<String>> setOfString = new TypeLiteral<Set<String>>() {};
final TypeLiteral<Set<Integer>> setOfInteger = new TypeLiteral<Set<Integer>>() {};
final TypeLiteral<String> stringType = TypeLiteral.get(String.class);
final TypeLiteral<Integer> intType = TypeLiteral.get(Integer.class);
final TypeLiteral<List<String>> listOfStrings = new TypeLiteral<List<String>>() {};
final TypeLiteral<Set<List<String>>> setOfListOfStrings = new TypeLiteral<Set<List<String>>>() {};
final TypeLiteral<Collection<Provider<String>>> collectionOfProvidersOfStrings =
new TypeLiteral<Collection<Provider<String>>>() {};
public void testMultibinderAggregatesMultipleModules() {
Module abc = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
multibinder.addBinding().toInstance("C");
}
};
Module de = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("D");
multibinder.addBinding().toInstance("E");
}
};
Injector injector = Guice.createInjector(abc, de);
Key<Set<String>> setKey = Key.get(setOfString);
Set<String> abcde = injector.getInstance(setKey);
Set<String> results = setOf("A", "B", "C", "D", "E");
assertEquals(results, abcde);
assertSetVisitor(setKey, stringType, setOf(abc, de), BOTH, false, 0,
instance("A"), instance("B"), instance("C"), instance("D"), instance("E"));
}
public void testMultibinderAggregationForAnnotationInstance() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder
= Multibinder.newSetBinder(binder(), String.class, Names.named("abc"));
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
multibinder = Multibinder.newSetBinder(binder(), String.class, Names.named("abc"));
multibinder.addBinding().toInstance("C");
}
};
Injector injector = Guice.createInjector(module);
Key<Set<String>> setKey = Key.get(setOfString, Names.named("abc"));
Set<String> abc = injector.getInstance(setKey);
Set<String> results = setOf("A", "B", "C");
assertEquals(results, abc);
assertSetVisitor(setKey, stringType, setOf(module), BOTH, false, 0,
instance("A"), instance("B"), instance("C"));
}
public void testMultibinderAggregationForAnnotationType() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder
= Multibinder.newSetBinder(binder(), String.class, Abc.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
multibinder = Multibinder.newSetBinder(binder(), String.class, Abc.class);
multibinder.addBinding().toInstance("C");
}
};
Injector injector = Guice.createInjector(module);
Key<Set<String>> setKey = Key.get(setOfString, Abc.class);
Set<String> abcde = injector.getInstance(setKey);
Set<String> results = setOf("A", "B", "C");
assertEquals(results, abcde);
assertSetVisitor(setKey, stringType, setOf(module), BOTH, false, 0,
instance("A"), instance("B"), instance("C"));
}
public void testMultibinderWithMultipleAnnotationValueSets() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder<String> abcMultibinder
= Multibinder.newSetBinder(binder(), String.class, named("abc"));
abcMultibinder.addBinding().toInstance("A");
abcMultibinder.addBinding().toInstance("B");
abcMultibinder.addBinding().toInstance("C");
Multibinder<String> deMultibinder
= Multibinder.newSetBinder(binder(), String.class, named("de"));
deMultibinder.addBinding().toInstance("D");
deMultibinder.addBinding().toInstance("E");
}
};
Injector injector = Guice.createInjector(module);
Key<Set<String>> abcSetKey = Key.get(setOfString, named("abc"));
Set<String> abc = injector.getInstance(abcSetKey);
Key<Set<String>> deSetKey = Key.get(setOfString, named("de"));
Set<String> de = injector.getInstance(deSetKey);
Set<String> abcResults = setOf("A", "B", "C");
assertEquals(abcResults, abc);
Set<String> deResults = setOf("D", "E");
assertEquals(deResults, de);
assertSetVisitor(abcSetKey, stringType, setOf(module), BOTH, false, 1,
instance("A"), instance("B"), instance("C"));
assertSetVisitor(deSetKey, stringType, setOf(module), BOTH, false, 1,
instance("D"), instance("E"));
}
public void testMultibinderWithMultipleAnnotationTypeSets() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder<String> abcMultibinder
= Multibinder.newSetBinder(binder(), String.class, Abc.class);
abcMultibinder.addBinding().toInstance("A");
abcMultibinder.addBinding().toInstance("B");
abcMultibinder.addBinding().toInstance("C");
Multibinder<String> deMultibinder
= Multibinder.newSetBinder(binder(), String.class, De.class);
deMultibinder.addBinding().toInstance("D");
deMultibinder.addBinding().toInstance("E");
}
};
Injector injector = Guice.createInjector(module);
Key<Set<String>> abcSetKey = Key.get(setOfString, Abc.class);
Set<String> abc = injector.getInstance(abcSetKey);
Key<Set<String>> deSetKey = Key.get(setOfString, De.class);
Set<String> de = injector.getInstance(deSetKey);
Set<String> abcResults = setOf("A", "B", "C");
assertEquals(abcResults, abc);
Set<String> deResults = setOf("D", "E");
assertEquals(deResults, de);
assertSetVisitor(abcSetKey, stringType, setOf(module), BOTH, false, 1,
instance("A"), instance("B"), instance("C"));
assertSetVisitor(deSetKey, stringType, setOf(module), BOTH, false, 1,
instance("D"), instance("E"));
}
public void testMultibinderWithMultipleSetTypes() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("A");
Multibinder.newSetBinder(binder(), Integer.class)
.addBinding().toInstance(1);
}
};
Injector injector = Guice.createInjector(module);
assertEquals(setOf("A"), injector.getInstance(Key.get(setOfString)));
assertEquals(setOf(1), injector.getInstance(Key.get(setOfInteger)));
assertSetVisitor(Key.get(setOfString), stringType, setOf(module), BOTH, false, 1,
instance("A"));
assertSetVisitor(Key.get(setOfInteger), intType, setOf(module), BOTH, false, 1,
instance(1));
}
public void testMultibinderWithEmptySet() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class);
}
};
Injector injector = Guice.createInjector(module);
Set<String> set = injector.getInstance(Key.get(setOfString));
assertEquals(Collections.emptySet(), set);
assertSetVisitor(Key.get(setOfString), stringType,
setOf(module), BOTH, false, 0);
}
public void testMultibinderSetIsUnmodifiable() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("A");
}
});
Set<String> set = injector.getInstance(Key.get(setOfString));
try {
set.clear();
fail();
} catch(UnsupportedOperationException expected) {
}
}
public void testMultibinderSetIsSerializable() throws IOException, ClassNotFoundException {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("A");
}
});
Set<String> set = injector.getInstance(Key.get(setOfString));
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteStream);
try {
objectOutputStream.writeObject(set);
} finally {
objectOutputStream.close();
}
ObjectInputStream objectInputStream = new ObjectInputStream(
new ByteArrayInputStream(byteStream.toByteArray()));
try {
Object setCopy = objectInputStream.readObject();
assertEquals(set, setCopy);
} finally {
objectInputStream.close();
}
}
public void testMultibinderSetIsLazy() {
Module module = new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), Integer.class)
.addBinding().toProvider(new Provider<Integer>() {
int nextValue = 1;
public Integer get() {
return nextValue++;
}
});
}
};
Injector injector = Guice.createInjector(module);
assertEquals(setOf(1), injector.getInstance(Key.get(setOfInteger)));
assertEquals(setOf(2), injector.getInstance(Key.get(setOfInteger)));
assertEquals(setOf(3), injector.getInstance(Key.get(setOfInteger)));
assertSetVisitor(Key.get(setOfInteger), intType, setOf(module), BOTH, false, 0,
providerInstance(1));
}
public void testMultibinderSetForbidsDuplicateElements() {
Module module1 = new AbstractModule() {
protected void configure() {
final Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toProvider(Providers.of("A"));
}
};
Module module2 = new AbstractModule() {
protected void configure() {
final Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
}
};
Injector injector = Guice.createInjector(module1, module2);
try {
injector.getInstance(Key.get(setOfString));
fail();
} catch (ProvisionException expected) {
assertContains(expected.getMessage(),
"1) Set injection failed due to duplicated element \"A\"",
"Bound at " + module1.getClass().getName(),
"Bound at " + module2.getClass().getName());
}
// But we can still visit the module!
assertSetVisitor(Key.get(setOfString), stringType, setOf(module1, module2), MODULE, false, 0,
instance("A"), instance("A"));
}
public void testMultibinderSetShowsBothElementsIfToStringDifferent() {
// A simple example of a type whose toString returns more information than its equals method
// considers.
class ValueType {
int a;
int b;
ValueType(int a, int b) {
this.a = a;
this.b = b;
}
@Override
public boolean equals(Object obj) {
return (obj instanceof ValueType) && (((ValueType) obj).a == a);
}
@Override
public int hashCode() {
return a;
}
@Override
public String toString() {
return String.format("ValueType(%d,%d)", a, b);
}
}
Module module1 = new AbstractModule() {
protected void configure() {
final Multibinder<ValueType> multibinder =
Multibinder.newSetBinder(binder(), ValueType.class);
multibinder.addBinding().toProvider(Providers.of(new ValueType(1, 2)));
}
};
Module module2 = new AbstractModule() {
protected void configure() {
final Multibinder<ValueType> multibinder =
Multibinder.newSetBinder(binder(), ValueType.class);
multibinder.addBinding().toInstance(new ValueType(1, 3));
}
};
Injector injector = Guice.createInjector(module1, module2);
TypeLiteral<ValueType> valueType = TypeLiteral.get(ValueType.class);
TypeLiteral<Set<ValueType>> setOfValueType = new TypeLiteral<Set<ValueType>>() {};
try {
injector.getInstance(Key.get(setOfValueType));
fail();
} catch (ProvisionException expected) {
assertContains(expected.getMessage(),
"1) Set injection failed due to multiple elements comparing equal:",
"\"ValueType(1,2)\"",
"bound at " + module1.getClass().getName(),
"\"ValueType(1,3)\"",
"bound at " + module2.getClass().getName());
}
// But we can still visit the module!
assertSetVisitor(Key.get(setOfValueType), valueType, setOf(module1, module2), MODULE, false, 0,
instance(new ValueType(1, 2)), instance(new ValueType(1, 3)));
}
public void testMultibinderSetPermitDuplicateElements() {
Module ab = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
}
};
Module bc = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.permitDuplicates();
multibinder.addBinding().toInstance("B");
multibinder.addBinding().toInstance("C");
}
};
Injector injector = Guice.createInjector(ab, bc);
assertEquals(setOf("A", "B", "C"), injector.getInstance(Key.get(setOfString)));
assertSetVisitor(Key.get(setOfString), stringType, setOf(ab, bc), BOTH, true, 0,
instance("A"), instance("B"), instance("C"));
}
public void testMultibinderSetPermitDuplicateCallsToPermitDuplicates() {
Module ab = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.permitDuplicates();
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
}
};
Module bc = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.permitDuplicates();
multibinder.addBinding().toInstance("B");
multibinder.addBinding().toInstance("C");
}
};
Injector injector = Guice.createInjector(ab, bc);
assertEquals(setOf("A", "B", "C"), injector.getInstance(Key.get(setOfString)));
assertSetVisitor(Key.get(setOfString), stringType, setOf(ab, bc), BOTH, true, 0,
instance("A"), instance("B"), instance("C"));
}
public void testMultibinderSetForbidsNullElements() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toProvider(Providers.<String>of(null));
}
});
try {
injector.getInstance(Key.get(setOfString));
fail();
} catch(ProvisionException expected) {
assertContains(expected.getMessage(),
"1) Set injection failed due to null element");
}
}
public void testSourceLinesInMultibindings() {
try {
Guice.createInjector(new AbstractModule() {
@Override protected void configure() {
Multibinder.newSetBinder(binder(), Integer.class).addBinding();
}
});
fail();
} catch (CreationException expected) {
assertContains(expected.getMessage(), "No implementation for java.lang.Integer",
"at " + getClass().getName());
}
}
/**
* We just want to make sure that multibinder's binding depends on each of its values. We don't
* really care about the underlying structure of those bindings, which are implementation details.
*/
public void testMultibinderDependencies() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().to(Key.get(String.class, Names.named("b")));
bindConstant().annotatedWith(Names.named("b")).to("B");
}
});
Binding<Set<String>> binding = injector.getBinding(new Key<Set<String>>() {});
HasDependencies withDependencies = (HasDependencies) binding;
Set<String> elements = Sets.newHashSet();
for (Dependency<?> dependency : withDependencies.getDependencies()) {
elements.add((String) injector.getInstance(dependency.getKey()));
}
assertEquals(ImmutableSet.of("A", "B"), elements);
}
/**
* We just want to make sure that multibinder's binding depends on each of its values. We don't
* really care about the underlying structure of those bindings, which are implementation details.
*/
public void testMultibinderDependenciesInToolStage() {
Injector injector = Guice.createInjector(Stage.TOOL, new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().to(Key.get(String.class, Names.named("b")));
bindConstant().annotatedWith(Names.named("b")).to("B");
}});
Binding<Set<String>> binding = injector.getBinding(new Key<Set<String>>() {});
HasDependencies withDependencies = (HasDependencies) binding;
InstanceBinding<?> instanceBinding = null;
LinkedKeyBinding<?> linkedBinding = null;
// The non-tool stage test can test this by calling injector.getInstance to ensure
// the right values are returned -- in tool stage we can't do that. It's also a
// little difficult to validate the dependencies & bindings, because they're
// bindings created internally within Multibinder.
// To workaround this, we just validate that the dependencies lookup to a single
// InstanceBinding whose value is "A" and another LinkedBinding whose target is
// the Key of @Named("b") String=B
for (Dependency<?> dependency : withDependencies.getDependencies()) {
Binding<?> b = injector.getBinding(dependency.getKey());
if(b instanceof InstanceBinding) {
if(instanceBinding != null) {
fail("Already have an instance binding of: " + instanceBinding + ", and now want to add: " + b);
} else {
instanceBinding = (InstanceBinding)b;
}
} else if(b instanceof LinkedKeyBinding) {
if(linkedBinding != null) {
fail("Already have a linked binding of: " + linkedBinding + ", and now want to add: " + b);
} else {
linkedBinding = (LinkedKeyBinding)b;
}
} else {
fail("Unexpected dependency of: " + dependency);
}
}
assertNotNull(instanceBinding);
assertNotNull(linkedBinding);
assertEquals("A", instanceBinding.getInstance());
assertEquals(Key.get(String.class, Names.named("b")), linkedBinding.getLinkedKey());
}
/**
* Our implementation maintains order, but doesn't guarantee it in the API spec.
* TODO: specify the iteration order?
*/
public void testBindOrderEqualsIterationOrder() {
Injector injector = Guice.createInjector(
new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("leonardo");
multibinder.addBinding().toInstance("donatello");
install(new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("michaelangelo");
}
});
}
},
new AbstractModule() {
protected void configure() {
Multibinder.newSetBinder(binder(), String.class).addBinding().toInstance("raphael");
}
});
List<String> inOrder = ImmutableList.copyOf(injector.getInstance(Key.get(setOfString)));
assertEquals(ImmutableList.of("leonardo", "donatello", "michaelangelo", "raphael"), inOrder);
}
@Retention(RUNTIME) @BindingAnnotation
@interface Abc {}
@Retention(RUNTIME) @BindingAnnotation
@interface De {}
private <T> Set<T> setOf(T... elements) {
Set<T> result = Sets.newHashSet();
Collections.addAll(result, elements);
return result;
}
/**
* With overrides, we should get the union of all multibindings.
*/
public void testModuleOverrideAndMultibindings() {
Module ab = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
}
};
Module cd = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("C");
multibinder.addBinding().toInstance("D");
}
};
Module ef = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("E");
multibinder.addBinding().toInstance("F");
}
};
Module abcd = Modules.override(ab).with(cd);
Injector injector = Guice.createInjector(abcd, ef);
assertEquals(ImmutableSet.of("A", "B", "C", "D", "E", "F"),
injector.getInstance(Key.get(setOfString)));
assertSetVisitor(Key.get(setOfString), stringType, setOf(abcd, ef), BOTH, false, 0,
instance("A"), instance("B"), instance("C"), instance("D"), instance("E"), instance("F"));
}
/**
* With overrides, we should get the union of all multibindings.
*/
public void testModuleOverrideAndMultibindingsWithPermitDuplicates() {
Module abc = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
multibinder.addBinding().toInstance("C");
multibinder.permitDuplicates();
}
};
Module cd = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("C");
multibinder.addBinding().toInstance("D");
multibinder.permitDuplicates();
}
};
Module ef = new AbstractModule() {
protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("E");
multibinder.addBinding().toInstance("F");
multibinder.permitDuplicates();
}
};
Module abcd = Modules.override(abc).with(cd);
Injector injector = Guice.createInjector(abcd, ef);
assertEquals(ImmutableSet.of("A", "B", "C", "D", "E", "F"),
injector.getInstance(Key.get(setOfString)));
assertSetVisitor(Key.get(setOfString), stringType, setOf(abcd, ef), BOTH, true, 0,
instance("A"), instance("B"), instance("C"), instance("D"), instance("E"), instance("F"));
}
/**
* Doubly-installed modules should not conflict, even when one is overridden.
*/
public void testModuleOverrideRepeatedInstallsAndMultibindings_toInstance() {
Module ab = new AbstractModule() {
@Override protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toInstance("A");
multibinder.addBinding().toInstance("B");
}
};
// Guice guarantees this assertion, as the same module cannot be installed twice.
assertEquals(ImmutableSet.of("A", "B"),
Guice.createInjector(ab, ab).getInstance(Key.get(setOfString)));
// Guice will only guarantee this assertion if Multibinder ensures the bindings match.
Injector injector = Guice.createInjector(ab, Modules.override(ab).with(ab));
assertEquals(ImmutableSet.of("A", "B"),
injector.getInstance(Key.get(setOfString)));
}
public void testModuleOverrideRepeatedInstallsAndMultibindings_toKey() {
Module ab = new AbstractModule() {
@Override protected void configure() {
Key<String> aKey = Key.get(String.class, Names.named("A_string"));
Key<String> bKey = Key.get(String.class, Names.named("B_string"));
bind(aKey).toInstance("A");
bind(bKey).toInstance("B");
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().to(aKey);
multibinder.addBinding().to(bKey);
}
};
// Guice guarantees this assertion, as the same module cannot be installed twice.
assertEquals(ImmutableSet.of("A", "B"),
Guice.createInjector(ab, ab).getInstance(Key.get(setOfString)));
// Guice will only guarantee this assertion if Multibinder ensures the bindings match.
Injector injector = Guice.createInjector(ab, Modules.override(ab).with(ab));
assertEquals(ImmutableSet.of("A", "B"),
injector.getInstance(Key.get(setOfString)));
}
public void testModuleOverrideRepeatedInstallsAndMultibindings_toProviderInstance() {
Module ab = new AbstractModule() {
@Override protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toProvider(Providers.of("A"));
multibinder.addBinding().toProvider(Providers.of("B"));
}
};
// Guice guarantees this assertion, as the same module cannot be installed twice.
assertEquals(ImmutableSet.of("A", "B"),
Guice.createInjector(ab, ab).getInstance(Key.get(setOfString)));
// Guice will only guarantee this assertion if Multibinder ensures the bindings match.
Injector injector = Guice.createInjector(ab, Modules.override(ab).with(ab));
assertEquals(ImmutableSet.of("A", "B"),
injector.getInstance(Key.get(setOfString)));
}
private static class AStringProvider implements Provider<String> {
public String get() {
return "A";
}
}
private static class BStringProvider implements Provider<String> {
public String get() {
return "B";
}
}
public void testModuleOverrideRepeatedInstallsAndMultibindings_toProviderKey() {
Module ab = new AbstractModule() {
@Override protected void configure() {
Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toProvider(Key.get(AStringProvider.class));
multibinder.addBinding().toProvider(Key.get(BStringProvider.class));
}
};
// Guice guarantees this assertion, as the same module cannot be installed twice.
assertEquals(ImmutableSet.of("A", "B"),
Guice.createInjector(ab, ab).getInstance(Key.get(setOfString)));
// Guice will only guarantee this assertion if Multibinder ensures the bindings match.
Injector injector = Guice.createInjector(ab, Modules.override(ab).with(ab));
assertEquals(ImmutableSet.of("A", "B"),
injector.getInstance(Key.get(setOfString)));
}
private static class StringGrabber {
private final String string;
@SuppressWarnings("unused") // Found by reflection
public StringGrabber(@Named("A_string") String string) {
this.string = string;
}
@SuppressWarnings("unused") // Found by reflection
public StringGrabber(@Named("B_string") String string, int unused) {
this.string = string;
}
@Override
public int hashCode() {
return string.hashCode();
}
@Override
public boolean equals(Object obj) {
return (obj instanceof StringGrabber) && ((StringGrabber) obj).string.equals(string);
}
@Override
public String toString() {
return "StringGrabber(" + string + ")";
}
static Set<String> values(Iterable<StringGrabber> grabbers) {
Set<String> result = new HashSet<String>();
for (StringGrabber grabber : grabbers) {
result.add(grabber.string);
}
return result;
}
}
public void testModuleOverrideRepeatedInstallsAndMultibindings_toConstructor() {
TypeLiteral<Set<StringGrabber>> setOfStringGrabber = new TypeLiteral<Set<StringGrabber>>() {};
Module ab = new AbstractModule() {
@Override protected void configure() {
Key<String> aKey = Key.get(String.class, Names.named("A_string"));
Key<String> bKey = Key.get(String.class, Names.named("B_string"));
bind(aKey).toInstance("A");
bind(bKey).toInstance("B");
bind(Integer.class).toInstance(0); // used to disambiguate constructors
Multibinder<StringGrabber> multibinder =
Multibinder.newSetBinder(binder(), StringGrabber.class);
try {
multibinder.addBinding().toConstructor(
StringGrabber.class.getConstructor(String.class));
multibinder.addBinding().toConstructor(
StringGrabber.class.getConstructor(String.class, int.class));
} catch (NoSuchMethodException e) {
fail("No such method: " + e.getMessage());
}
}
};
// Guice guarantees this assertion, as the same module cannot be installed twice.
assertEquals(ImmutableSet.of("A", "B"),
StringGrabber.values(
Guice.createInjector(ab, ab).getInstance(Key.get(setOfStringGrabber))));
// Guice will only guarantee this assertion if Multibinder ensures the bindings match.
Injector injector = Guice.createInjector(ab, Modules.override(ab).with(ab));
assertEquals(ImmutableSet.of("A", "B"),
StringGrabber.values(injector.getInstance(Key.get(setOfStringGrabber))));
}
/**
* Unscoped bindings should not conflict, whether they were bound with no explicit scope, or
* explicitly bound in {@link Scopes#NO_SCOPE}.
*/
public void testDuplicateUnscopedBindings() {
Module singleBinding = new AbstractModule() {
@Override protected void configure() {
bind(Integer.class).to(Key.get(Integer.class, named("A")));
bind(Integer.class).to(Key.get(Integer.class, named("A"))).in(Scopes.NO_SCOPE);
}
@Provides @Named("A")
int provideInteger() {
return 5;
}
};
Module multibinding = new AbstractModule() {
@Override protected void configure() {
Multibinder<Integer> multibinder = Multibinder.newSetBinder(binder(), Integer.class);
multibinder.addBinding().to(Key.get(Integer.class, named("A")));
multibinder.addBinding().to(Key.get(Integer.class, named("A"))).in(Scopes.NO_SCOPE);
}
};
assertEquals(5,
(int) Guice.createInjector(singleBinding).getInstance(Integer.class));
assertEquals(ImmutableSet.of(5),
Guice.createInjector(singleBinding, multibinding).getInstance(Key.get(setOfInteger)));
}
/**
* Ensure key hash codes are fixed at injection time, not binding time.
*/
public void testKeyHashCodesFixedAtInjectionTime() {
Module ab = new AbstractModule() {
@Override protected void configure() {
Multibinder<List<String>> multibinder = Multibinder.newSetBinder(binder(), listOfStrings);
List<String> list = Lists.newArrayList();
multibinder.addBinding().toInstance(list);
list.add("A");
list.add("B");
}
};
Injector injector = Guice.createInjector(ab);
for (Entry<Key<?>, Binding<?>> entry : injector.getAllBindings().entrySet()) {
Key<?> bindingKey = entry.getKey();
Key<?> clonedKey;
if (bindingKey.getAnnotation() != null) {
clonedKey = Key.get(bindingKey.getTypeLiteral(), bindingKey.getAnnotation());
} else if (bindingKey.getAnnotationType() != null) {
clonedKey = Key.get(bindingKey.getTypeLiteral(), bindingKey.getAnnotationType());
} else {
clonedKey = Key.get(bindingKey.getTypeLiteral());
}
assertEquals(bindingKey, clonedKey);
assertEquals("Incorrect hashcode for " + bindingKey + " -> " + entry.getValue(),
bindingKey.hashCode(), clonedKey.hashCode());
}
}
/**
* Ensure bindings do not rehash their keys once returned from {@link Elements#getElements}.
*/
public void testBindingKeysFixedOnReturnFromGetElements() {
final List<String> list = Lists.newArrayList();
Module ab = new AbstractModule() {
@Override protected void configure() {
Multibinder<List<String>> multibinder = Multibinder.newSetBinder(binder(), listOfStrings);
multibinder.addBinding().toInstance(list);
list.add("A");
list.add("B");
}
};
InstanceBinding<?> binding = Iterables.getOnlyElement(
Iterables.filter(Elements.getElements(ab), InstanceBinding.class));
Key<?> keyBefore = binding.getKey();
assertEquals(listOfStrings, keyBefore.getTypeLiteral());
list.add("C");
Key<?> keyAfter = binding.getKey();
assertSame(keyBefore, keyAfter);
}
/*
* Verify through gratuitous mutation that key hashCode snapshots and whatnot happens at the right
* times, by binding two lists that are different at injector creation, but compare equal when the
* module is configured *and* when the set is instantiated.
*/
public void testConcurrentMutation_bindingsDiffentAtInjectorCreation() {
// We initially bind two equal lists
final List<String> list1 = Lists.newArrayList();
final List<String> list2 = Lists.newArrayList();
Module module = new AbstractModule() {
@Override protected void configure() {
Multibinder<List<String>> multibinder = Multibinder.newSetBinder(binder(), listOfStrings);
multibinder.addBinding().toInstance(list1);
multibinder.addBinding().toInstance(list2);
}
};
List<Element> elements = Elements.getElements(module);
// Now we change the lists so they no longer match, and create the injector.
list1.add("A");
list2.add("B");
Injector injector = Guice.createInjector(Elements.getModule(elements));
// Now we change the lists so they compare equal again, and create the set.
list1.add(1, "B");
list2.add(0, "A");
try {
injector.getInstance(Key.get(setOfListOfStrings));
fail();
} catch (ProvisionException e) {
assertEquals(1, e.getErrorMessages().size());
assertContains(
Iterables.getOnlyElement(e.getErrorMessages()).getMessage().toString(),
"Set injection failed due to duplicated element \"[A, B]\"");
}
// Finally, we change the lists again so they are once more different, and ensure the set
// contains both.
list1.remove("A");
list2.remove("B");
Set<List<String>> set = injector.getInstance(Key.get(setOfListOfStrings));
assertEquals(ImmutableSet.of(ImmutableList.of("A"), ImmutableList.of("B")), set);
}
/*
* Verify through gratuitous mutation that key hashCode snapshots and whatnot happen at the right
* times, by binding two lists that compare equal at injector creation, but are different when the
* module is configured *and* when the set is instantiated.
*/
public void testConcurrentMutation_bindingsSameAtInjectorCreation() {
// We initially bind two distinct lists
final List<String> list1 = Lists.newArrayList("A");
final List<String> list2 = Lists.newArrayList("B");
Module module = new AbstractModule() {
@Override protected void configure() {
Multibinder<List<String>> multibinder = Multibinder.newSetBinder(binder(), listOfStrings);
multibinder.addBinding().toInstance(list1);
multibinder.addBinding().toInstance(list2);
}
};
List<Element> elements = Elements.getElements(module);
// Now we change the lists so they compare equal, and create the injector.
list1.add(1, "B");
list2.add(0, "A");
Injector injector = Guice.createInjector(Elements.getModule(elements));
// Now we change the lists again so they are once more different, and create the set.
list1.remove("A");
list2.remove("B");
Set<List<String>> set = injector.getInstance(Key.get(setOfListOfStrings));
// The set will contain just one of the two lists.
// (In fact, it will be the first one we bound, but we don't promise that, so we won't test it.)
assertTrue(ImmutableSet.of(ImmutableList.of("A")).equals(set)
|| ImmutableSet.of(ImmutableList.of("B")).equals(set));
}
@BindingAnnotation
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD})
private static @interface Marker {}
@Marker
public void testMultibinderMatching() throws Exception {
Method m = MultibinderTest.class.getDeclaredMethod("testMultibinderMatching");
assertNotNull(m);
final Annotation marker = m.getAnnotation(Marker.class);
Injector injector = Guice.createInjector(new AbstractModule() {
@Override public void configure() {
Multibinder<Integer> mb1 = Multibinder.newSetBinder(binder(), Integer.class, Marker.class);
Multibinder<Integer> mb2 = Multibinder.newSetBinder(binder(), Integer.class, marker);
mb1.addBinding().toInstance(1);
mb2.addBinding().toInstance(2);
// This assures us that the two binders are equivalent, so we expect the instance added to
// each to have been added to one set.
assertEquals(mb1, mb2);
}
});
TypeLiteral<Set<Integer>> t = new TypeLiteral<Set<Integer>>() {};
Set<Integer> s1 = injector.getInstance(Key.get(t, Marker.class));
Set<Integer> s2 = injector.getInstance(Key.get(t, marker));
// This assures us that the two sets are in fact equal. They may not be same set (as in Java
// object identical), but we shouldn't expect that, since probably Guice creates the set each
// time in case the elements are dependent on scope.
assertEquals(s1, s2);
// This ensures that MultiBinder is internally using the correct set name --
// making sure that instances of marker annotations have the same set name as
// MarkerAnnotation.class.
Set<Integer> expected = new HashSet<Integer>();
expected.add(1);
expected.add(2);
assertEquals(expected, s1);
}
// See issue 670
public void testSetAndMapValueAreDistinct() {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("A");
MapBinder.newMapBinder(binder(), String.class, String.class)
.addBinding("B").toInstance("b");
OptionalBinder.newOptionalBinder(binder(), String.class)
.setDefault().toInstance("C");
OptionalBinder.newOptionalBinder(binder(), String.class)
.setBinding().toInstance("D");
}
});
assertEquals(ImmutableSet.of("A"), injector.getInstance(Key.get(setOfString)));
assertEquals(ImmutableMap.of("B", "b"), injector.getInstance(Key.get(mapOfStringString)));
assertEquals(Optional.of("D"), injector.getInstance(Key.get(optionalOfString)));
}
// See issue 670
public void testSetAndMapValueAreDistinctInSpi() {
Injector injector = Guice.createInjector(new AbstractModule() {
@Override protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.addBinding().toInstance("A");
MapBinder.newMapBinder(binder(), String.class, String.class)
.addBinding("B").toInstance("b");
OptionalBinder.newOptionalBinder(binder(), String.class)
.setDefault().toInstance("C");
}
});
Collector collector = new Collector();
Binding<Map<String, String>> mapbinding = injector.getBinding(Key.get(mapOfStringString));
mapbinding.acceptTargetVisitor(collector);
assertNotNull(collector.mapbinding);
Binding<Set<String>> setbinding = injector.getBinding(Key.get(setOfString));
setbinding.acceptTargetVisitor(collector);
assertNotNull(collector.setbinding);
Binding<Optional<String>> optionalbinding = injector.getBinding(Key.get(optionalOfString));
optionalbinding.acceptTargetVisitor(collector);
assertNotNull(collector.optionalbinding);
// There should only be three instance bindings for string types
// (but because of the OptionalBinder, there's 2 ProviderInstanceBindings also).
// We also know the InstanceBindings will be in the order: A, b, C because that's
// how we bound them, and binding order is preserved.
List<Binding<String>> bindings = FluentIterable.from(injector.findBindingsByType(stringType))
.filter(Predicates.instanceOf(InstanceBinding.class))
.toList();
assertEquals(bindings.toString(), 3, bindings.size());
Binding<String> a = bindings.get(0);
Binding<String> b = bindings.get(1);
Binding<String> c = bindings.get(2);
assertEquals("A", ((InstanceBinding<String>) a).getInstance());
assertEquals("b", ((InstanceBinding<String>) b).getInstance());
assertEquals("C", ((InstanceBinding<String>) c).getInstance());
// Make sure the correct elements belong to their own sets.
assertFalse(collector.mapbinding.containsElement(a));
assertTrue(collector.mapbinding.containsElement(b));
assertFalse(collector.mapbinding.containsElement(c));
assertTrue(collector.setbinding.containsElement(a));
assertFalse(collector.setbinding.containsElement(b));
assertFalse(collector.setbinding.containsElement(c));
assertFalse(collector.optionalbinding.containsElement(a));
assertFalse(collector.optionalbinding.containsElement(b));
assertTrue(collector.optionalbinding.containsElement(c));
}
public void testMultibinderCanInjectCollectionOfProviders() {
Module module = new AbstractModule() {
protected void configure() {
final Multibinder<String> multibinder = Multibinder.newSetBinder(binder(), String.class);
multibinder.addBinding().toProvider(Providers.of("A"));
multibinder.addBinding().toProvider(Providers.of("B"));
multibinder.addBinding().toInstance("C");
}
};
Collection<String> expectedValues = ImmutableList.of("A", "B", "C");
Injector injector = Guice.createInjector(module);
Collection<Provider<String>> providers =
injector.getInstance(Key.get(collectionOfProvidersOfStrings));
assertEquals(expectedValues, collectValues(providers));
Collection<javax.inject.Provider<String>> javaxProviders =
injector.getInstance(Key.get(collectionOfJavaxProvidersOf(stringType)));
assertEquals(expectedValues, collectValues(javaxProviders));
}
public void testMultibinderCanInjectCollectionOfProvidersWithAnnotation() {
final Annotation ann = Names.named("foo");
Module module = new AbstractModule() {
protected void configure() {
final Multibinder<String> multibinder =
Multibinder.newSetBinder(binder(), String.class, ann);
multibinder.addBinding().toProvider(Providers.of("A"));
multibinder.addBinding().toProvider(Providers.of("B"));
multibinder.addBinding().toInstance("C");
}
};
Collection<String> expectedValues = ImmutableList.of("A", "B", "C");
Injector injector = Guice.createInjector(module);
Collection<Provider<String>> providers =
injector.getInstance(Key.get(collectionOfProvidersOfStrings, ann));
Collection<String> values = collectValues(providers);
assertEquals(expectedValues, values);
Collection<javax.inject.Provider<String>> javaxProviders =
injector.getInstance(Key.get(collectionOfJavaxProvidersOf(stringType), ann));
assertEquals(expectedValues, collectValues(javaxProviders));
}
public void testMultibindingProviderDependencies() {
final Annotation setAnn = Names.named("foo");
Injector injector = Guice.createInjector(new AbstractModule() {
@Override protected void configure() {
Multibinder<String> multibinder =
Multibinder.newSetBinder(binder(), String.class, setAnn);
multibinder.addBinding().toInstance("a");
multibinder.addBinding().toInstance("b");
}
});
HasDependencies providerBinding =
(HasDependencies) injector.getBinding(new Key<Collection<Provider<String>>>(setAnn) {});
HasDependencies setBinding =
(HasDependencies) injector.getBinding(new Key<Set<String>>(setAnn) {});
// sanity check the size
assertEquals(setBinding.getDependencies().toString(), 2, setBinding.getDependencies().size());
Set<Dependency<?>> expected = Sets.newHashSet();
for (Dependency<?> dep : setBinding.getDependencies()) {
Key key = dep.getKey();
Dependency<?> providerDependency =
Dependency.get(key.ofType(Types.providerOf(key.getTypeLiteral().getType())));
expected.add(providerDependency);
}
assertEquals(expected, providerBinding.getDependencies());
}
private <T> Collection<T> collectValues(
Collection<? extends javax.inject.Provider<T>> providers) {
Collection<T> values = Lists.newArrayList();
for (javax.inject.Provider<T> provider : providers) {
values.add(provider.get());
}
return values;
}
}