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package org.glassfish.jersey.server.internal.inject;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.util.Collections;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.inject.ContextInjectionResolver;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.process.internal.RequestScoped;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.model.Parameter.Source;
import org.glassfish.jersey.server.spi.internal.ValueFactoryProvider;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InjectionResolver;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.AbstractActiveDescriptor;
import org.glassfish.hk2.utilities.InjecteeImpl;
import org.glassfish.hk2.utilities.cache.Cache;
import org.glassfish.hk2.utilities.cache.Computable;
/**
* Value factory provider that delegates the injection target lookup to
* the underlying injection provider (HK2).
*
* @author Marek Potociar (marek.potociar at oracle.com)
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
@Singleton
class DelegatedInjectionValueFactoryProvider implements ValueFactoryProvider {
private final ContextInjectionResolver resolver;
/**
* Injection constructor.
*
* @param locator HK2 service locator.
*/
@Inject
public DelegatedInjectionValueFactoryProvider(ServiceLocator locator) {
ContextInjectionResolver result = null;
for (InjectionResolver r : Providers.getProviders(locator, InjectionResolver.class)) {
if (ContextInjectionResolver.class.isInstance(r)) {
result = ContextInjectionResolver.class.cast(r);
break;
}
}
resolver = result;
}
@Override
public Factory<?> getValueFactory(final Parameter parameter) {
final Source paramSource = parameter.getSource();
if (paramSource == Parameter.Source.CONTEXT) {
final Injectee effectiveInjectee = getInjectee(parameter);
return new Factory<Object>() {
@Override
public Object provide() {
return resolver.resolve(effectiveInjectee, null);
}
@Override
public void dispose(Object instance) {
//not used
}
};
}
return null;
}
@Override
public PriorityType getPriority() {
return Priority.LOW;
}
/**
* We do not want to create a new descriptor instance for every and each method invocation.
*/
static final Cache<Parameter, ActiveDescriptor> descriptorCache =
new Cache<Parameter, ActiveDescriptor>(new Computable<Parameter, ActiveDescriptor>(){
@Override
public ActiveDescriptor compute(Parameter parameter) {
Class<?> rawType = parameter.getRawType();
if (rawType.isInterface() && ! (parameter.getType() instanceof ParameterizedType)) {
return createDescriptor(rawType);
}
return null;
}
});
private static Injectee getInjectee(final Parameter parameter) {
return new InjecteeImpl() {
private final Class<?> rawType = parameter.getRawType();
{
setRequiredType(parameter.getType());
setRequiredQualifiers(Collections.<Annotation>emptySet());
final ActiveDescriptor proxyDescriptor = descriptorCache.compute(parameter);
if (proxyDescriptor != null) {
setInjecteeDescriptor(proxyDescriptor);
}
}
@Override
public Class<?> getInjecteeClass() {
return rawType;
}
};
}
private static <T> AbstractActiveDescriptor<T> createDescriptor(final Class<T> clazz) {
return new AbstractActiveDescriptor<T>() {
@Override
public Class<T> getImplementationClass() {
return clazz;
}
@Override
public Object create(ServiceHandle sh) {
return null;
}
@Override
public Boolean isProxyForSameScope() {
return false;
}
@Override
public synchronized String getScope() {
return RequestScoped.class.getName();
}
};
}
}