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package com.sun.jersey.server.impl.resource;
import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.api.model.AbstractResource;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.core.spi.component.ioc.IoCComponentProvider;
import com.sun.jersey.core.spi.component.ioc.IoCDestroyable;
import com.sun.jersey.core.spi.component.ioc.IoCInstantiatedComponentProvider;
import com.sun.jersey.core.spi.component.ioc.IoCProxiedComponentProvider;
import com.sun.jersey.server.impl.inject.ServerInjectableProviderContext;
import com.sun.jersey.server.spi.component.ResourceComponentConstructor;
import com.sun.jersey.server.spi.component.ResourceComponentDestructor;
import com.sun.jersey.server.spi.component.ResourceComponentInjector;
import com.sun.jersey.server.spi.component.ResourceComponentProvider;
import com.sun.jersey.server.spi.component.ResourceComponentProviderFactory;
import java.lang.reflect.InvocationTargetException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.core.Context;
/**
* A simple provider that maintains a singleton resource class instance
*/
public final class SingletonFactory implements ResourceComponentProviderFactory {
private static final Logger LOGGER = Logger.getLogger(SingletonFactory.class.getName());
private final ServerInjectableProviderContext sipc;
public SingletonFactory(
@Context ServerInjectableProviderContext sipc) {
this.sipc = sipc;
}
public ComponentScope getScope(Class c) {
return ComponentScope.Singleton;
}
public ResourceComponentProvider getComponentProvider(Class c) {
return new Singleton();
}
public ResourceComponentProvider getComponentProvider(IoCComponentProvider icp, Class c) {
if (icp instanceof IoCInstantiatedComponentProvider) {
return new SingletonInstantiated((IoCInstantiatedComponentProvider)icp);
} else if (icp instanceof IoCProxiedComponentProvider) {
return new SingletonProxied((IoCProxiedComponentProvider)icp);
}
throw new IllegalStateException();
}
private abstract class AbstractSingleton implements ResourceComponentProvider {
private ResourceComponentDestructor rcd;
protected Object resource;
public void init(AbstractResource abstractResource) {
rcd = new ResourceComponentDestructor(abstractResource);
}
public final Object getInstance(HttpContext hc) {
return resource;
}
public final Object getInstance() {
return resource;
}
public final ComponentScope getScope() {
return ComponentScope.Singleton;
}
public void destroy() {
try {
rcd.destroy(resource);
} 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 class Singleton extends AbstractSingleton {
@Override
public void init(AbstractResource abstractResource) {
super.init(abstractResource);
ResourceComponentConstructor rcc = new ResourceComponentConstructor(
sipc,
ComponentScope.Singleton,
abstractResource);
try {
this.resource = rcc.construct(null);
} catch (InvocationTargetException ex) {
throw new ContainerException("Unable to create resource", ex);
} catch (InstantiationException ex) {
throw new ContainerException("Unable to create resource", ex);
} catch (IllegalAccessException ex) {
throw new ContainerException("Unable to create resource", ex);
}
}
}
private class SingletonInstantiated extends AbstractSingleton {
private final IoCInstantiatedComponentProvider iicp;
private final IoCDestroyable destroyable;
SingletonInstantiated(IoCInstantiatedComponentProvider iicp) {
this.iicp = iicp;
this.destroyable = (iicp instanceof IoCDestroyable)
? (IoCDestroyable) iicp : null;
}
@Override
public void init(AbstractResource abstractResource) {
super.init(abstractResource);
resource = iicp.getInstance();
if (destroyable == null) {
ResourceComponentInjector rci = new ResourceComponentInjector(
sipc,
ComponentScope.Singleton,
abstractResource);
rci.inject(null, iicp.getInjectableInstance(resource));
}
}
@Override
public void destroy() {
if (destroyable != null) {
destroyable.destroy(resource);
} else {
super.destroy();
}
}
}
private class SingletonProxied extends AbstractSingleton {
private final IoCProxiedComponentProvider ipcp;
SingletonProxied(IoCProxiedComponentProvider ipcp) {
this.ipcp = ipcp;
}
@Override
public void init(AbstractResource abstractResource) {
super.init(abstractResource);
ResourceComponentConstructor rcc = new ResourceComponentConstructor(
sipc,
ComponentScope.Singleton,
abstractResource);
try {
Object o = rcc.construct(null);
resource = ipcp.proxy(o);
} catch (InvocationTargetException ex) {
throw new ContainerException("Unable to create resource", ex);
} catch (InstantiationException ex) {
throw new ContainerException("Unable to create resource", ex);
} catch (IllegalAccessException ex) {
throw new ContainerException("Unable to create resource", ex);
}
}
}
}