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/**
* Copyright (C) 2006 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.name.Names.named;
import com.google.inject.name.Named;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.List;
/**
* @author crazybob@google.com (Bob Lee)
*/
public class ProviderInjectionTest extends TestCase {
public void testProviderInjection() throws CreationException {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
bind(Bar.class);
bind(SampleSingleton.class).in(Scopes.SINGLETON);
}
});
Foo foo = injector.getInstance(Foo.class);
Bar bar = foo.barProvider.get();
assertNotNull(bar);
assertNotSame(bar, foo.barProvider.get());
SampleSingleton singleton = foo.singletonProvider.get();
assertNotNull(singleton);
assertSame(singleton, foo.singletonProvider.get());
}
/** Test for bug 155. */
public void testProvidersAreInjectedWhenBound() {
Module m = new AbstractModule() {
@Override
protected void configure() {
bind(Bar.class).toProvider(new Provider<Bar>() {
@SuppressWarnings("unused")
@Inject void cantBeCalled(Baz baz) {
fail("Can't have called this method since Baz is not bound.");
}
public Bar get() {
return new Bar() {};
}
});
}
};
try {
Guice.createInjector(m);
fail("Should have thrown a CreationException");
}
catch (CreationException expected) {
}
}
/**
* When custom providers are used at injector creation time, they should be
* injected before use. In this testcase, we verify that a provider for
* List.class is injected before it is used.
*/
public void testProvidersAreInjectedBeforeTheyAreUsed() {
Injector injector = Guice.createInjector(new AbstractModule() {
public void configure() {
// should bind String to "[true]"
bind(String.class).toProvider(new Provider<String>() {
private String value;
@Inject void initialize(List list) {
value = list.toString();
}
public String get() {
return value;
}
});
// should bind List to [true]
bind(List.class).toProvider(new Provider<List>() {
@Inject Boolean injectedYet = Boolean.FALSE;
public List get() {
return Arrays.asList(injectedYet);
}
});
// should bind Boolean to true
bind(Boolean.class).toInstance(Boolean.TRUE);
}
});
assertEquals("Providers not injected before use",
"[true]",
injector.getInstance(String.class));
}
/**
* This test ensures that regardless of binding order, instances are injected
* before they are used. It injects mutable Count objects and records their
* value at the time that they're injected.
*/
public void testCreationTimeInjectionOrdering() {
Injector injector = Guice.createInjector(new AbstractModule() {
protected void configure() {
// instance injection
bind(Count.class).annotatedWith(named("a")).toInstance(new Count(0) {
@Inject void initialize(@Named("b") Count bCount) {
value = bCount.value + 1;
}
});
// provider injection
bind(Count.class).annotatedWith(named("b")).toProvider(new Provider<Count>() {
Count count;
@Inject void initialize(@Named("c") Count cCount) {
count = new Count(cCount.value + 2);
}
public Count get() {
return count;
}
});
// field and method injection, fields first
bind(Count.class).annotatedWith(named("c")).toInstance(new Count(0) {
@Inject @Named("d") Count dCount;
@Inject void initialize(@Named("e") Count eCount) {
value = dCount.value + eCount.value + 4;
}
});
// static injection
requestStaticInjection(StaticallyInjectable.class);
bind(Count.class).annotatedWith(named("d")).toInstance(new Count(8));
bind(Count.class).annotatedWith(named("e")).toInstance(new Count(16));
}
});
assertEquals(28, injector.getInstance(Key.get(Count.class, named("c"))).value);
assertEquals(30, injector.getInstance(Key.get(Count.class, named("b"))).value);
assertEquals(31, injector.getInstance(Key.get(Count.class, named("a"))).value);
assertEquals(28, StaticallyInjectable.cCountAtInjectionTime);
}
static class Count {
int value;
Count(int value) {
this.value = value;
}
}
static class StaticallyInjectable {
static int cCountAtInjectionTime;
@Inject static void initialize(@Named("c") Count cCount) {
cCountAtInjectionTime = cCount.value;
}
}
static class Foo {
@Inject Provider<Bar> barProvider;
@Inject Provider<SampleSingleton> singletonProvider;
}
static class Bar {}
static class SampleSingleton {}
interface Baz { }
}
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