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package com.sun.jersey.core.spi.component;
import com.sun.jersey.core.reflection.ReflectionHelper;
import com.sun.jersey.core.spi.factory.InjectableProviderFactory;
import com.sun.jersey.impl.SpiMessages;
import com.sun.jersey.spi.inject.ConstrainedTo;
import com.sun.jersey.spi.inject.ConstrainedToType;
import com.sun.jersey.spi.service.ServiceFinder;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Combines access to provider instances given a set of provider classes,
* a set of provider instances and providers registered in META-INF/services.
*
* @author [email protected]
*/
public class ProviderServices {
private static final Logger LOGGER = Logger.getLogger(ProviderServices.class.getName());
private final Class constraintToType;
private final ProviderFactory componentProviderFactory;
private final Set> providers;
private final Set providerInstances;
/**
* Create the provider services.
*
* @param componentProviderFactory
* @param providers
* @param providerInstances
*/
public ProviderServices(
ProviderFactory componentProviderFactory,
Set> providers,
Set providerInstances) {
this(ConstrainedToType.class, componentProviderFactory, providers, providerInstances);
}
/**
* Create the provider services.
*
* @param constraintToType
* @param componentProviderFactory
* @param providers
* @param providerInstances
*/
public ProviderServices(
Class constraintToType,
ProviderFactory componentProviderFactory,
Set> providers,
Set providerInstances) {
this.constraintToType = constraintToType;
this.componentProviderFactory = componentProviderFactory;
this.providers = providers;
this.providerInstances = providerInstances;
}
public void update(Set> providers, Set providerInstances, InjectableProviderFactory ipf) {
final Set> addedProviders = diff(this.providers, providers);
final Set addedProviderInstances = diff(this.providerInstances, providerInstances);
this.providers.clear();
this.providers.addAll(providers);
this.providerInstances.clear();
this.providerInstances.addAll(providerInstances);
final ProviderServices _ps = new ProviderServices(componentProviderFactory, addedProviders, addedProviderInstances);
final InjectableProviderFactory _ipf = new InjectableProviderFactory();
_ipf.configureProviders(_ps);
ipf.update(_ipf);
}
private Set diff(Set s1, Set s2) {
Set diff = new LinkedHashSet();
for (T t : s1) {
if (!s2.contains(t)) {
diff.add(t);
}
}
for (T t : s2) {
if (!s1.contains(t)) {
diff.add(t);
}
}
return diff;
}
public ProviderFactory getComponentProviderFactory() {
return componentProviderFactory;
}
public Set getProviders(Class provider) {
Set ps = new LinkedHashSet();
ps.addAll(getProviderInstances(provider));
for (Class pc : getProviderClasses(provider)) {
Object o = getComponent(pc);
if (o != null) {
ps.add(provider.cast(o));
}
}
return ps;
}
public Set getServices(Class provider) {
Set ps = new LinkedHashSet();
for (ProviderClass pc : getServiceClasses(provider)) {
Object o = getComponent(pc);
if (o != null) {
ps.add(provider.cast(o));
}
}
return ps;
}
public Set getProvidersAndServices(Class provider) {
Set ps = new LinkedHashSet();
ps.addAll(getProviderInstances(provider));
for (ProviderClass pc : getProviderAndServiceClasses(provider)) {
Object o = getComponent(pc);
if (o != null) {
ps.add(provider.cast(o));
}
}
return ps;
}
public static interface ProviderListener {
void onAdd(T t);
}
public void getProviders(Class provider, ProviderListener listener) {
for (T t : getProviderInstances(provider)) {
listener.onAdd(t);
}
for (ProviderClass pc : getProviderOnlyClasses(provider)) {
Object o = getComponent(pc);
if (o != null) {
listener.onAdd(provider.cast(o));
}
}
}
public void getProvidersAndServices(Class provider, ProviderListener listener) {
for (T t : getProviderInstances(provider)) {
listener.onAdd(t);
}
for (ProviderClass pc : getProviderAndServiceClasses(provider)) {
Object o = getComponent(pc);
if (o != null) {
listener.onAdd(provider.cast(o));
}
}
}
public List getInstances(Class provider, String[] classNames) {
List ps = new LinkedList();
for (String className : classNames) {
try {
Class c = AccessController.doPrivileged(ReflectionHelper.classForNameWithExceptionPEA(className));
if (provider.isAssignableFrom(c)) {
Object o = getComponent(c);
if (o != null)
ps.add(provider.cast(o));
} else {
LOGGER.severe("The class " +
className +
" is not assignable to the class " +
provider.getName() +
". This class is ignored.");
}
} catch (ClassNotFoundException ex) {
LOGGER.severe("The class " +
className +
" could not be found" +
". This class is ignored.");
} catch (PrivilegedActionException pae) {
final Throwable thrown = pae.getCause();
if (thrown instanceof ClassNotFoundException) {
LOGGER.severe("The class " +
className +
" could not be found" +
". This class is ignored.");
} else if (thrown instanceof NoClassDefFoundError) {
LOGGER.severe(
SpiMessages.DEPENDENT_CLASS_OF_PROVIDER_NOT_FOUND(
thrown.getLocalizedMessage(), className, provider));
} else if (thrown instanceof ClassFormatError) {
LOGGER.severe(
SpiMessages.DEPENDENT_CLASS_OF_PROVIDER_FORMAT_ERROR(
thrown.getLocalizedMessage(), className, provider));
} else {
LOGGER.severe(SpiMessages.PROVIDER_CLASS_COULD_NOT_BE_LOADED(className, provider.getName(), thrown.getLocalizedMessage()));
}
}
}
return ps;
}
public List getInstances(Class provider, Class[] classes) {
List ps = new LinkedList();
for (Class c : classes) {
Object o = getComponent(c);
if (o != null)
ps.add(provider.cast(o));
}
return ps;
}
private Object getComponent(Class provider) {
ComponentProvider cp = componentProviderFactory.getComponentProvider(provider);
return (cp != null) ? cp.getInstance() : null;
}
private Object getComponent(ProviderClass provider) {
ComponentProvider cp = componentProviderFactory.getComponentProvider(provider);
return (cp != null) ? cp.getInstance() : null;
}
private Set getProviderInstances(Class service) {
Set sp = new LinkedHashSet();
for (Object p : providerInstances) {
if (service.isInstance(p) && constrainedTo(p.getClass()))
sp.add(service.cast(p));
}
return sp;
}
private Set getProviderClasses(Class service) {
Set sp = new LinkedHashSet();
for (Class p : providers) {
if (service.isAssignableFrom(p) && constrainedTo(p))
sp.add(p);
}
return sp;
}
public class ProviderClass {
final boolean isServiceClass;
final Class c;
ProviderClass(Class c) {
this.c = c;
this.isServiceClass = false;
}
ProviderClass(Class c, boolean isServiceClass) {
this.c = c;
this.isServiceClass = isServiceClass;
}
}
private Set getProviderAndServiceClasses(Class service) {
Set sp = getProviderOnlyClasses(service);
getServiceClasses(service, sp);
return sp;
}
private Set getProviderOnlyClasses(Class service) {
Set sp = new LinkedHashSet();
for(Class c : getProviderClasses(service)) {
sp.add(new ProviderClass(c));
}
return sp;
}
private Set getServiceClasses(Class service) {
Set sp = new LinkedHashSet();
getServiceClasses(service, sp);
return sp;
}
private void getServiceClasses(Class service, Set sp) {
// Get the service-defined provider classes that implement serviceClass
LOGGER.log(Level.CONFIG, "Searching for providers that implement: " + service);
Class[] pca = ServiceFinder.find(service, true).toClassArray();
for (Class pc : pca) {
if (constrainedTo(pc)) {
LOGGER.log(Level.CONFIG, " Provider found: " + pc);
}
}
// Add service-defined providers to the set after application-defined
for (Class pc : pca) {
if (constrainedTo(pc)) {
if(service.isAssignableFrom(pc)) {
sp.add(new ProviderClass(pc, true));
} else {
LOGGER.log(Level.CONFIG, "Provider " + pc.getName() +
" won't be used because its not assignable to " +
service.getName() + ". This might be caused by clashing " +
"container-provided and application-bundled Jersey classes.");
}
}
}
}
private boolean constrainedTo(Class p) {
final ConstrainedTo ct = p.getAnnotation(ConstrainedTo.class);
return (ct != null)
? ct.value().isAssignableFrom(constraintToType)
: true;
}
}
