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package org.glassfish.hk2.utilities.binding;
import java.lang.annotation.Annotation;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Descriptor;
import org.glassfish.hk2.api.DynamicConfiguration;
import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.FactoryDescriptors;
import org.glassfish.hk2.api.Filter;
import org.glassfish.hk2.api.HK2Loader;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.Binder;
import org.glassfish.hk2.utilities.DescriptorImpl;
/**
* Skeleton implementation of injection binder with convenience methods for
* binding definitions.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public abstract class AbstractBinder implements Binder, DynamicConfiguration {
private transient DynamicConfiguration configuration;
private transient AbstractBindingBuilder currentBuilder;
private transient HK2Loader defaultLoader;
/**
* Start building a new class-based service binding.
*
* Does NOT bind the service type itself as a contract type.
*
* @param service type.
* @param serviceType service class.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bind(Class serviceType) {
return resetBuilder(AbstractBindingBuilder.create(serviceType, false));
}
/**
* Start building a new class-based service binding.
*
* Binds the service type itself as a contract type.
*
* @param service type.
* @param serviceType service class.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bindAsContract(Class serviceType) {
return resetBuilder(AbstractBindingBuilder.create(serviceType, true));
}
/**
* Start building a new generic type-based service binding.
*
* Binds the generic service type itself as a contract type.
*
* @param service type.
* @param serviceType generic service type information.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bindAsContract(TypeLiteral serviceType) {
return resetBuilder(AbstractBindingBuilder.create(serviceType, true));
}
/**
* Start building a new instance-based service binding. The binding is naturally
* considered to be a {@link javax.inject.Singleton singleton-scoped}.
*
* Does NOT bind the service type itself as a contract type.
*
* @param service type.
* @param service service instance.
* @return initialized binding builder.
*/
public ScopedBindingBuilder bind(T service) {
return resetBuilder(AbstractBindingBuilder.create(service));
}
/**
* Start building a new factory class-based service binding.
*
* @param service type.
* @param factoryType service factory class.
* @param factoryScope factory scope.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bindFactory(
Class> factoryType, Class factoryScope) {
return resetBuilder(AbstractBindingBuilder.createFactoryBinder(factoryType, factoryScope));
}
/**
* Start building a new factory class-based service binding.
*
* The factory itself is bound in a {@link org.glassfish.hk2.api.PerLookup per-lookup} scope.
*
* @param service type.
* @param factoryType service factory class.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bindFactory(Class> factoryType) {
return resetBuilder(AbstractBindingBuilder.createFactoryBinder(factoryType, null));
}
/**
* Start building a new factory instance-based service binding.
*
* @param service type.
* @param factory service instance.
* @return initialized binding builder.
*/
public ServiceBindingBuilder bindFactory(Factory factory) {
return resetBuilder(AbstractBindingBuilder.createFactoryBinder(factory));
}
@Override
public void bind(DynamicConfiguration configuration) {
if (this.configuration != null) {
throw new IllegalArgumentException("Recursive configuration call detected.");
}
if (configuration == null) {
throw new NullPointerException("configuration");
}
this.configuration = configuration;
try {
configure();
} finally {
complete();
}
}
private AbstractBindingBuilder resetBuilder(AbstractBindingBuilder newBuilder) {
if (currentBuilder != null) {
currentBuilder.complete(configuration(), getDefaultBinderLoader());
}
currentBuilder = newBuilder;
return newBuilder;
}
private void complete() {
try {
resetBuilder(null);
} finally {
this.configuration = null;
}
}
/**
* Implement to provide binding definitions using the exposed binding
* methods.
*/
protected abstract void configure();
/**
* Get the active {@link DynamicConfiguration binder factory} instance used for
* binding configuration. This method can only be called from within the
* scope of the {@link #configure()} method.
*
* @return dynamic configuration instance used for binding configuration.
* @throws IllegalStateException in case the method is not called from within
* an active call to {@link #configure()} method.
*/
private DynamicConfiguration configuration() {
if (configuration == null)
throw new IllegalArgumentException("Dynamic configuration accessed from outside of an active binder configuration scope.");
return configuration;
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public ActiveDescriptor bind(Descriptor descriptor) {
return bind(descriptor, true);
}
@Override
public ActiveDescriptor bind(Descriptor descriptor, boolean requiresDeepCopy) {
setLoader(descriptor);
return configuration().bind(descriptor, requiresDeepCopy);
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public FactoryDescriptors bind(FactoryDescriptors factoryDescriptors) {
return bind(factoryDescriptors, true);
}
@Override
public FactoryDescriptors bind(FactoryDescriptors factoryDescriptors, boolean requiresDeepCopy) {
setLoader(factoryDescriptors.getFactoryAsAService());
setLoader(factoryDescriptors.getFactoryAsAFactory());
return configuration().bind(factoryDescriptors, requiresDeepCopy);
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public ActiveDescriptor addActiveDescriptor(ActiveDescriptor activeDescriptor) throws IllegalArgumentException {
return addActiveDescriptor(activeDescriptor, true);
}
@Override
public ActiveDescriptor addActiveDescriptor(ActiveDescriptor activeDescriptor, boolean requiresDeepCopy) throws IllegalArgumentException {
return configuration().addActiveDescriptor(activeDescriptor, requiresDeepCopy);
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public ActiveDescriptor addActiveDescriptor(Class rawClass) throws MultiException, IllegalArgumentException {
return configuration().addActiveDescriptor(rawClass);
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public void addUnbindFilter(Filter unbindFilter) throws IllegalArgumentException {
configuration().addUnbindFilter(unbindFilter);
}
/**
* {@inheritDoc}
*
* This method can be called only in the execution context of the {@link #configure()}
* method.
*
*/
@Override
public void commit() throws MultiException {
configuration().commit();
}
/**
* Adds all binding definitions from the binders to the binding configuration.
*
* @param binders binders whose binding definitions should be configured.
*/
public final void install(Binder... binders) {
for (Binder binder : binders) {
binder.bind(this);
}
}
private void setLoader(Descriptor descriptor) {
if (descriptor.getLoader() == null && descriptor instanceof DescriptorImpl) {
((DescriptorImpl) descriptor).setLoader(getDefaultBinderLoader());
} // else who knows?
}
private HK2Loader getDefaultBinderLoader() {
if (defaultLoader == null) {
final ClassLoader binderClassLoader = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
ClassLoader loader = this.getClass().getClassLoader();
if (loader == null) {
return ClassLoader.getSystemClassLoader();
}
return loader;
}
});
defaultLoader = new HK2Loader() {
@Override
public Class loadClass(String className) throws MultiException {
try {
return binderClassLoader.loadClass(className);
} catch (ClassNotFoundException e) {
throw new MultiException(e);
}
}
};
}
return defaultLoader;
}
}