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package org.glassfish.jersey.server.internal.inject;
import java.lang.reflect.ParameterizedType;
import java.util.function.Function;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.inject.Binding;
import org.glassfish.jersey.internal.inject.Bindings;
import org.glassfish.jersey.internal.inject.ContextInjectionResolver;
import org.glassfish.jersey.internal.inject.ForeignDescriptor;
import org.glassfish.jersey.internal.inject.Injectee;
import org.glassfish.jersey.internal.inject.InjecteeImpl;
import org.glassfish.jersey.internal.util.collection.Cache;
import org.glassfish.jersey.internal.util.collection.LazyValue;
import org.glassfish.jersey.process.internal.RequestScoped;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.model.Parameter.Source;
import org.glassfish.jersey.server.spi.internal.ValueParamProvider;
/**
* Value factory provider that delegates the injection target lookup to the underlying injection provider.
*
* @author Marek Potociar (marek.potociar at oracle.com)
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
@Singleton
class DelegatedInjectionValueParamProvider implements ValueParamProvider {
private final LazyValue<ContextInjectionResolver> resolver;
private final Function<Binding, ForeignDescriptor> foreignDescriptorFactory;
/**
* Injection constructor.
*
* @param resolver context injection resolver.
* @param foreignDescriptorFactory function that is able to create a new foreign descriptor.
*/
public DelegatedInjectionValueParamProvider(LazyValue<ContextInjectionResolver> resolver,
Function<Binding, ForeignDescriptor> foreignDescriptorFactory) {
this.resolver = resolver;
this.foreignDescriptorFactory = foreignDescriptorFactory;
}
@Override
public Function<ContainerRequest, ?> getValueProvider(final Parameter parameter) {
Source paramSource = parameter.getSource();
if (paramSource == Parameter.Source.CONTEXT) {
return containerRequest -> resolver.get().resolve(getInjectee(parameter));
}
return null;
}
@Override
public PriorityType getPriority() {
return Priority.LOW;
}
/**
* Creates a new object {@link Injectee} corresponding to the injecting point. The injectee contains basic information
* about the injection point types and {@link ForeignDescriptor} of the underlying DI provider to make delegated injection
* resolver as simple as possible.
*
* @param parameter jersey-like parameter corresponding to one resource-method's parameter.
* @return injectee instance as a source of the information about the injecting point.
*/
private Injectee getInjectee(Parameter parameter) {
InjecteeImpl injectee = new InjecteeImpl();
injectee.setRequiredType(parameter.getType());
injectee.setInjecteeClass(parameter.getRawType());
ForeignDescriptor proxyDescriptor = descriptorCache.apply(parameter);
if (proxyDescriptor != null) {
injectee.setInjecteeDescriptor(proxyDescriptor);
}
return injectee;
}
/**
* We do not want to create a new descriptor instance for every and each method invocation.
* If the underlying DI descriptor {@link ForeignDescriptor} is already created for the given {@link Parameter} then
* used the already created descriptor.
*/
private final Cache<Parameter, ForeignDescriptor> descriptorCache =
new Cache<>(parameter -> {
Class<?> rawType = parameter.getRawType();
if (rawType.isInterface() && !(parameter.getType() instanceof ParameterizedType)) {
return createDescriptor(rawType);
}
return null;
});
/**
* Method is able to create form incoming class and {@link Binding jersey descriptor} a {@link ForeignDescriptor} which is
* provided by underlying DI provider.
*
* @param clazz class from which jersey-like descriptor is created.
* @return foreign descriptor of the underlying DI provider.
*/
private ForeignDescriptor createDescriptor(Class<?> clazz) {
return foreignDescriptorFactory.apply(Bindings.serviceAsContract(clazz).in(RequestScoped.class));
}
}