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package com.sun.jersey.core.spi.component.ioc;
import com.sun.jersey.core.spi.component.ComponentDestructor;
import com.sun.jersey.core.spi.component.ComponentInjector;
import com.sun.jersey.core.spi.component.ComponentProvider;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.core.spi.component.ProviderFactory;
import com.sun.jersey.core.util.PriorityUtil;
import com.sun.jersey.spi.inject.InjectableProviderContext;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
/**
* An extension of {@link ProviderFactory} that defers to an
* {@link IoCComponentProviderFactory}.
*
* All registered provider factory implementations are being polled
* so that a single {@link IoCComponentProvider} instance could be selected
* for each component.
*
* @author Paul Sandoz (paul.sandoz at oracle.com)
*/
public class IoCProviderFactory extends ProviderFactory {
/*
The following would be added to the class javadoc if the priority annotation
was part of public API:
Polling order is specified by priority value
set on individual provider factories. The factory that has the highest
priority value is polled first. Priority value is set using
{@link Priority} annotation.
*/
private final List factories;
/**
* Create a new provider factory based
* on given context and factory.
*
* @param ipc the injectable provider context.
* @param icpf the IoC component provider factory.
*/
public IoCProviderFactory(
InjectableProviderContext ipc,
IoCComponentProviderFactory icpf) {
this(ipc, Collections.singletonList(icpf));
}
/**
* Create a new provider factory based on given context and factories.
*
* @param ipc the injectable provider context.
* @param factories the list of IoC component provider factory.
*/
public IoCProviderFactory(
InjectableProviderContext ipc,
List factories) {
super(ipc);
List myFactories = new ArrayList(factories);
Collections.sort(myFactories, PriorityUtil.INSTANCE_COMPARATOR);
this.factories = Collections.unmodifiableList(myFactories);
}
@Override
public ComponentProvider _getComponentProvider(Class c) {
IoCComponentProvider icp = null;
for (IoCComponentProviderFactory f : factories) {
icp = f.getComponentProvider(c);
if (icp != null)
break;
}
return (icp == null) ? super._getComponentProvider(c) : wrap(c, icp);
}
private ComponentProvider wrap(Class c, IoCComponentProvider icp) {
if (icp instanceof IoCManagedComponentProvider) {
IoCManagedComponentProvider imcp = (IoCManagedComponentProvider)icp;
if (imcp.getScope() == ComponentScope.Singleton) {
return new ManagedSingleton(getInjectableProviderContext(), imcp, c);
} else {
throw new RuntimeException("The scope of the component " + c + " must be a singleton");
}
} else if (icp instanceof IoCFullyManagedComponentProvider) {
IoCFullyManagedComponentProvider ifmcp = (IoCFullyManagedComponentProvider)icp;
return new FullyManagedSingleton(ifmcp.getInstance());
} else if (icp instanceof IoCInstantiatedComponentProvider) {
IoCInstantiatedComponentProvider iicp = (IoCInstantiatedComponentProvider)icp;
return new InstantiatedSingleton(getInjectableProviderContext(), iicp, c);
} else if (icp instanceof IoCProxiedComponentProvider) {
IoCProxiedComponentProvider ipcp = (IoCProxiedComponentProvider)icp;
ComponentProvider cp = super._getComponentProvider(c);
// Problem creating the component provider
if (cp == null)
return null;
return new ProxiedSingletonWrapper(ipcp, cp, c);
}
throw new UnsupportedOperationException();
}
private static class InstantiatedSingleton implements ComponentProvider, Destroyable {
private final Object o;
private final IoCDestroyable destroyable;
private final ComponentDestructor cd;
InstantiatedSingleton(InjectableProviderContext ipc,
IoCInstantiatedComponentProvider iicp,
Class c) {
this.destroyable = (iicp instanceof IoCDestroyable)
? (IoCDestroyable) iicp : null;
o = iicp.getInstance();
this.cd = (destroyable == null) ? new ComponentDestructor(c) : null;
if (destroyable == null) {
ComponentInjector ci = new ComponentInjector(
ipc,
c);
ci.inject(iicp.getInjectableInstance(o));
}
}
@Override
public Object getInstance() {
return o;
}
@Override
public void destroy() {
if (destroyable != null) {
destroyable.destroy(o);
} else {
try {
cd.destroy(o);
} catch (IllegalAccessException ex) {
LOGGER.log(Level.SEVERE, "Unable to destroy resource", ex);
} catch (IllegalArgumentException ex) {
LOGGER.log(Level.SEVERE, "Unable to destroy resource", ex);
} catch (InvocationTargetException ex) {
LOGGER.log(Level.SEVERE, "Unable to destroy resource", ex);
}
}
}
}
private static class ManagedSingleton implements ComponentProvider {
private final Object o;
ManagedSingleton(InjectableProviderContext ipc,
IoCInstantiatedComponentProvider iicp,
Class c) {
ComponentInjector rci = new ComponentInjector(
ipc,
c);
o = iicp.getInstance();
rci.inject(iicp.getInjectableInstance(o));
}
@Override
public Object getInstance() {
return o;
}
}
private static class FullyManagedSingleton implements ComponentProvider {
private final Object o;
FullyManagedSingleton(Object o) {
this.o = o;
}
@Override
public Object getInstance() {
return o;
}
}
private static class ProxiedSingletonWrapper implements ComponentProvider, Destroyable {
private final Destroyable destroyable;
private final Object proxy;
ProxiedSingletonWrapper(IoCProxiedComponentProvider ipcp,
ComponentProvider cp,
Class c) {
this.destroyable = (cp instanceof Destroyable)
? (Destroyable) cp : null;
Object o = cp.getInstance();
this.proxy = ipcp.proxy(o);
if (!this.proxy.getClass().isAssignableFrom(o.getClass()))
throw new IllegalStateException("Proxied object class " + this.proxy.getClass() +
" is not assignable from object class " + o.getClass());
}
@Override
public Object getInstance() {
return proxy;
}
@Override
public void destroy() {
if (destroyable != null) {
destroyable.destroy();
}
}
}
}
