Comment #2 on issue 386 by sberlin: Child Injector JIT Singletons Not Eager
http://code.google.com/p/google-guice/issues/detail?id=386
Here's a full test that outlines four different scenarios. Each of these
pass when
the Injector is the parent injector, but in a child injector the last two
fail.
---
package com.google.inject;
import junit.framework.TestCase;
public class ChildInjectorTest extends TestCase {
@Override
protected void setUp() throws Exception {
AImpl.count = 0;
}
public void testExplicitEagerSingleton() {
Guice.createInjector(Stage.PRODUCTION).createChildInjector(new
AbstractModule() {
@Override
protected void configure() {
bind(AImpl.class);
}
});
assertEquals(1, AImpl.count);
}
public void testLinkedEagerSingleton() {
Guice.createInjector(Stage.PRODUCTION).createChildInjector(new
AbstractModule() {
@Override
protected void configure() {
bind(AInter.class).to(AImpl.class);
}
});
assertEquals(1, AImpl.count);
}
public void testImplicitEagerSingletonThroughSingleton() {
Guice.createInjector(Stage.PRODUCTION).createChildInjector(new
AbstractModule() {
@Override
protected void configure() {
bind(B.class).in(Scopes.SINGLETON);
}
});
assertEquals(1, AImpl.count);
}
public void testImplicitEagerSingletonThroughUnscoped() {
Guice.createInjector(Stage.PRODUCTION).createChildInjector(new
AbstractModule() {
@Override
protected void configure() {
bind(B.class);
}
});
assertEquals(1, AImpl.count);
}
@Singleton
private static class AImpl implements AInter {
static int count;
AImpl() { count++; }
}
private static interface AInter {}
private static class B { @Inject B(Provider<AImpl> a) {} }
}
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