/**
* Copyright (C) 2009 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.assertContains;
import com.google.inject.internal.ImmutableList;
import com.google.inject.internal.Lists;
import com.google.inject.matcher.Matcher;
import com.google.inject.matcher.Matchers;
import static com.google.inject.matcher.Matchers.any;
import static com.google.inject.matcher.Matchers.only;
import static com.google.inject.name.Names.named;
import com.google.inject.spi.InjectionListener;
import com.google.inject.spi.TypeEncounter;
import com.google.inject.spi.TypeListener;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.TestCase;
/**
* @author jessewilson@google.com (Jesse Wilson)
*/
public class TypeListenerTest extends TestCase {
private final Matcher<Object> onlyAbcd = Matchers.only(new TypeLiteral<A>() {})
.or(only(new TypeLiteral<B>() {}))
.or(only(new TypeLiteral<C>() {}))
.or(only(new TypeLiteral<D>() {}));
final TypeListener failingTypeListener = new TypeListener() {
int failures = 0;
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
throw new ClassCastException("whoops, failure #" + (++failures));
}
@Override public String toString() {
return "clumsy";
}
};
final InjectionListener<Object> failingInjectionListener = new InjectionListener<Object>() {
int failures = 0;
public void afterInjection(Object injectee) {
throw new ClassCastException("whoops, failure #" + (++failures));
}
@Override public String toString() {
return "goofy";
}
};
final MembersInjector<Object> failingMembersInjector = new MembersInjector<Object>() {
int failures = 0;
public void injectMembers(Object instance) {
throw new ClassCastException("whoops, failure #" + (++failures));
}
@Override public String toString() {
return "awkward";
}
};
public void testTypeListenersAreFired() throws NoSuchMethodException {
final AtomicInteger firedCount = new AtomicInteger();
final TypeListener typeListener = new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
assertEquals(new TypeLiteral<A>() {}, type);
firedCount.incrementAndGet();
}
};
Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, typeListener);
bind(A.class);
}
});
assertEquals(1, firedCount.get());
}
public void testInstallingInjectionListener() {
final List<Object> injectees = Lists.newArrayList();
final InjectionListener<Object> injectionListener = new InjectionListener<Object>() {
public void afterInjection(Object injectee) {
injectees.add(injectee);
}
};
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounter.register(injectionListener);
}
});
bind(A.class);
}
});
assertEquals(ImmutableList.of(), injectees);
Object a1 = injector.getInstance(A.class);
assertEquals(ImmutableList.of(a1), injectees);
Object a2 = injector.getInstance(A.class);
assertEquals(ImmutableList.of(a1, a2), injectees);
Object b1 = injector.getInstance(B.class);
assertEquals(ImmutableList.of(a1, a2, b1), injectees);
Provider<A> aProvider = injector.getProvider(A.class);
assertEquals(ImmutableList.of(a1, a2, b1), injectees);
A a3 = aProvider.get();
A a4 = aProvider.get();
assertEquals(ImmutableList.of(a1, a2, b1, a3, a4), injectees);
}
/*if[AOP]*/
private static org.aopalliance.intercept.MethodInterceptor prefixInterceptor(
final String prefix) {
return new org.aopalliance.intercept.MethodInterceptor() {
public Object invoke(org.aopalliance.intercept.MethodInvocation methodInvocation)
throws Throwable {
return prefix + methodInvocation.proceed();
}
};
}
public void testAddingInterceptors() throws NoSuchMethodException {
final Matcher<Object> buzz = only(C.class.getMethod("buzz"));
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindInterceptor(any(), buzz, prefixInterceptor("ka"));
bindInterceptor(any(), any(), prefixInterceptor("fe"));
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounter.bindInterceptor(any(), prefixInterceptor("li"));
encounter.bindInterceptor(buzz, prefixInterceptor("no"));
}
});
}
});
// interceptors must be invoked in the order they're bound.
C c = injector.getInstance(C.class);
assertEquals("kafelinobuzz", c.buzz());
assertEquals("felibeep", c.beep());
}
/*end[AOP]*/
public void testTypeListenerThrows() {
try {
Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, failingTypeListener);
bind(B.class);
bind(C.class);
}
});
fail();
} catch (CreationException expected) {
assertContains(expected.getMessage(),
"1) Error notifying TypeListener clumsy (bound at " + getClass().getName(),
".configure(TypeListenerTest.java:",
"of " + B.class.getName(),
"Reason: java.lang.ClassCastException: whoops, failure #1",
"2) Error notifying TypeListener clumsy (bound at " + getClass().getName(),
".configure(TypeListenerTest.java:",
"of " + C.class.getName(),
"Reason: java.lang.ClassCastException: whoops, failure #2");
}
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, failingTypeListener);
}
});
try {
injector.getProvider(B.class);
fail();
} catch (ConfigurationException expected) {
assertContains(expected.getMessage(),
"1) Error notifying TypeListener clumsy (bound at " + getClass().getName(),
".configure(TypeListenerTest.java:",
"of " + B.class.getName(),
"Reason: java.lang.ClassCastException: whoops, failure #3");
}
// getting it again should yield the same exception #3
try {
injector.getInstance(B.class);
fail();
} catch (ConfigurationException expected) {
assertContains(expected.getMessage(),
"1) Error notifying TypeListener clumsy (bound at " + getClass().getName(),
".configure(TypeListenerTest.java:",
"of " + B.class.getName(),
"Reason: java.lang.ClassCastException: whoops, failure #3");
}
// non-injected types do not participate
assertSame(Stage.DEVELOPMENT, injector.getInstance(Stage.class));
}
public void testInjectionListenerThrows() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounter.register(failingInjectionListener);
}
});
bind(B.class);
}
});
try {
injector.getInstance(A.class);
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error notifying InjectionListener goofy of " + A.class.getName(),
" Reason: java.lang.ClassCastException: whoops, failure #1");
}
// second time through should be a new cause (#2)
try {
injector.getInstance(A.class);
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error notifying InjectionListener goofy of " + A.class.getName(),
" Reason: java.lang.ClassCastException: whoops, failure #2");
}
// we should get errors for all types, but only on getInstance()
Provider<B> bProvider = injector.getProvider(B.class);
try {
bProvider.get();
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error notifying InjectionListener goofy of " + B.class.getName(),
" Reason: java.lang.ClassCastException: whoops, failure #3");
}
// non-injected types do not participate
assertSame(Stage.DEVELOPMENT, injector.getInstance(Stage.class));
}
public void testInjectMembersTypeListenerFails() {
try {
Guice.createInjector(new AbstractModule() {
protected void configure() {
getMembersInjector(A.class);
bindListener(onlyAbcd, failingTypeListener);
}
});
fail();
} catch (CreationException expected) {
assertContains(expected.getMessage(),
"1) Error notifying TypeListener clumsy (bound at ",
TypeListenerTest.class.getName(), ".configure(TypeListenerTest.java:",
"of " + A.class.getName(),
" Reason: java.lang.ClassCastException: whoops, failure #1");
}
}
public void testConstructedTypeListenerIsTheSameAsMembersInjectorListener() {
final AtomicInteger typeEncounters = new AtomicInteger();
final AtomicInteger injections = new AtomicInteger();
final InjectionListener<A> listener = new InjectionListener<A>() {
public void afterInjection(A injectee) {
injections.incrementAndGet();
assertNotNull(injectee.injector);
}
};
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
typeEncounters.incrementAndGet();
encounter.register((InjectionListener) listener);
}
});
bind(A.class);
getMembersInjector(A.class);
}
});
// creating the injector shouldn't trigger injections
assertEquals(0, injections.getAndSet(0));
// constructing an A should trigger an injection
injector.getInstance(A.class);
assertEquals(1, injections.getAndSet(0));
// injecting an A should trigger an injection
injector.injectMembers(new A());
assertEquals(1, injections.getAndSet(0));
// getting a provider shouldn't
Provider<A> aProvider = injector.getProvider(A.class);
MembersInjector<A> aMembersInjector = injector.getMembersInjector(A.class);
assertEquals(0, injections.getAndSet(0));
// exercise the provider
aProvider.get();
aProvider.get();
assertEquals(2, injections.getAndSet(0));
// exercise the members injector
aMembersInjector.injectMembers(new A());
aMembersInjector.injectMembers(new A());
assertEquals(2, injections.getAndSet(0));
// we should only have encountered one type
assertEquals(1, typeEncounters.getAndSet(0));
}
public void testLookupsAtInjectorCreateTime() {
final AtomicReference<Provider<B>> bProviderReference = new AtomicReference<Provider<B>>();
final AtomicReference<MembersInjector<A>> aMembersInjectorReference
= new AtomicReference<MembersInjector<A>>();
final InjectionListener<Object> lookupsTester = new InjectionListener<Object>() {
public void afterInjection(Object injectee) {
assertNotNull(bProviderReference.get().get());
A a = new A();
aMembersInjectorReference.get().injectMembers(a);
assertNotNull(a.injector);
}
};
Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(only(TypeLiteral.get(C.class)), new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
Provider<B> bProvider = encounter.getProvider(B.class);
try {
bProvider.get();
fail();
} catch (IllegalStateException expected) {
assertEquals("This Provider cannot be used until the Injector has been created.",
expected.getMessage());
}
bProviderReference.set(bProvider);
MembersInjector<A> aMembersInjector = encounter.getMembersInjector(A.class);
try {
aMembersInjector.injectMembers(new A());
fail();
} catch (IllegalStateException expected) {
assertEquals(
"This MembersInjector cannot be used until the Injector has been created.",
expected.getMessage());
}
aMembersInjectorReference.set(aMembersInjector);
encounter.register(lookupsTester);
}
});
// this ensures the type listener fires, and also the afterInjection() listener
bind(C.class).asEagerSingleton();
}
});
lookupsTester.afterInjection(null);
}
public void testLookupsPostCreate() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(only(TypeLiteral.get(C.class)), new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
assertNotNull(encounter.getProvider(B.class).get());
A a = new A();
encounter.getMembersInjector(A.class).injectMembers(a);
assertNotNull(a.injector);
}
});
}
});
injector.getInstance(C.class);
}
public void testMembersInjector() {
final MembersInjector<D> membersInjector = new MembersInjector<D>() {
public void injectMembers(D instance) {
instance.userInjected++;
assertEquals(instance.guiceInjected, instance.userInjected);
}
};
final InjectionListener<D> injectionListener = new InjectionListener<D>() {
public void afterInjection(D injectee) {
assertTrue(injectee.userInjected > 0);
injectee.listenersNotified++;
assertEquals(injectee.guiceInjected, injectee.listenersNotified);
}
};
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounter.register((MembersInjector) membersInjector);
encounter.register((InjectionListener) injectionListener);
}
});
D boundThreeTimes = new D();
bind(D.class).annotatedWith(named("i")).toInstance(boundThreeTimes);
bind(D.class).annotatedWith(named("ii")).toInstance(boundThreeTimes);
bind(D.class).annotatedWith(named("iii")).toInstance(boundThreeTimes);
}
});
D boundThreeTimes = injector.getInstance(Key.get(D.class, named("iii")));
boundThreeTimes.assertAllCounts(1);
D getInstance = injector.getInstance(D.class);
getInstance.assertAllCounts(1);
D memberInjection = new D();
injector.injectMembers(memberInjection);
memberInjection.assertAllCounts(1);
injector.injectMembers(memberInjection);
injector.injectMembers(memberInjection);
memberInjection.assertAllCounts(3);
injector.getMembersInjector(D.class).injectMembers(memberInjection);
memberInjection.assertAllCounts(4);
}
public void testMembersInjectorThrows() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounter.register(failingMembersInjector);
}
});
bind(B.class);
}
});
try {
injector.getInstance(A.class);
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error injecting " + A.class.getName() + " using awkward.",
"Reason: java.lang.ClassCastException: whoops, failure #1");
}
// second time through should be a new cause (#2)
try {
injector.getInstance(A.class);
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error injecting " + A.class.getName() + " using awkward.",
"Reason: java.lang.ClassCastException: whoops, failure #2");
}
// we should get errors for all types, but only on getInstance()
Provider<B> bProvider = injector.getProvider(B.class);
try {
bProvider.get();
fail();
} catch (ProvisionException e) {
assertContains(e.getMessage(),
"1) Error injecting " + B.class.getName() + " using awkward.",
"Reason: java.lang.ClassCastException: whoops, failure #3");
}
// non-injected types do not participate
assertSame(Stage.DEVELOPMENT, injector.getInstance(Stage.class));
}
/**
* We had a bug where we weren't notifying of types encountered for member injection when those
* types had no members to be injected. Constructed types are always injected because they always
* have at least one injection point: the class constructor.
*/
public void testTypesWithNoInjectableMembersAreNotified() {
final AtomicInteger notificationCount = new AtomicInteger();
Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(onlyAbcd, new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
notificationCount.incrementAndGet();
}
});
bind(C.class).toInstance(new C());
}
});
assertEquals(1, notificationCount.get());
}
public void testEncounterCannotBeUsedAfterHearReturns() {
final AtomicReference<TypeEncounter<?>> encounterReference = new AtomicReference<TypeEncounter<?>>();
Guice.createInjector(new AbstractModule() {
protected void configure() {
bindListener(any(), new TypeListener() {
public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter) {
encounterReference.set(encounter);
}
});
bind(C.class);
}
});
TypeEncounter<?> encounter = encounterReference.get();
try {
encounter.register(new InjectionListener<Object>() {
public void afterInjection(Object injectee) {}
});
fail();
} catch (IllegalStateException expected) {
}
/*if[AOP]*/
try {
encounter.bindInterceptor(any(), new org.aopalliance.intercept.MethodInterceptor() {
public Object invoke(org.aopalliance.intercept.MethodInvocation methodInvocation)
throws Throwable {
return methodInvocation.proceed();
}
});
fail();
} catch (IllegalStateException expected) {
}
/*end[AOP]*/
try {
encounter.addError(new Exception());
fail();
} catch (IllegalStateException expected) {
}
try {
encounter.getMembersInjector(A.class);
fail();
} catch (IllegalStateException expected) {
}
try {
encounter.getProvider(B.class);
fail();
} catch (IllegalStateException expected) {
}
}
// TODO: recursively accessing a lookup should fail
static class A {
@Inject Injector injector;
@Inject Stage stage;
}
static class B {}
public static class C {
public String buzz() {
return "buzz";
}
public String beep() {
return "beep";
}
}
static class D {
int guiceInjected = 0;
int userInjected = 0;
int listenersNotified = 0;
@Inject void guiceInjected() {
guiceInjected++;
}
void assertAllCounts(int expected) {
assertEquals(expected, guiceInjected);
assertEquals(expected, userInjected);
assertEquals(expected, listenersNotified);
}
}
}