javax.ws.rs.client.ClientFactory Maven / Gradle / Ivy
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package javax.ws.rs.client;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.client.Client.Builder;
import javax.ws.rs.ext.ClientBuilderFactory;
/**
* Main entry point to the client API used to bootstrap {@link javax.ws.rs.client.Client}
* instances.
*
* @author Marek Potociar
* @since 2.0
*/
public class ClientFactory {
private static final Logger LOGGER = Logger.getLogger(Client.class.getName());
/**
* Name of the property identifying the {@link javax.ws.rs.ext.RuntimeDelegate} implementation
* to be returned from {@link javax.ws.rs.ext.RuntimeDelegate#getInstance()}.
*/
public static final String JAXRS_DEFAULT_CLIENT_BUILDER_FACTORY_PROPERTY = "javax.ws.rs.ext.ClientBuilderFactory";
private static final String JAXRS_DEFAULT_CLIENT_BUILDER_FACTORY = "org.glassfish.jersey.client.Client$Builder$Factory";
private static > FACTORY getFactory(Class builderFactoryClass) {
try {
return builderFactoryClass.newInstance(); // TODO instance caching(?), injecting, setup, etc.
} catch (InstantiationException ex) {
LOGGER.log(Level.SEVERE, "Unable to instantiate client builder factory.", ex);
} catch (IllegalAccessException ex) {
LOGGER.log(Level.SEVERE, "Unable to instantiate client builder factory.", ex);
}
return null;
}
// todo make generic
@SuppressWarnings("unchecked")
private static ClientBuilderFactory> getDefaultFactory() {
try {
Object delegate =
FactoryFinder.find(JAXRS_DEFAULT_CLIENT_BUILDER_FACTORY_PROPERTY,
JAXRS_DEFAULT_CLIENT_BUILDER_FACTORY);
if (!(delegate instanceof ClientBuilderFactory)) {
Class pClass = ClientBuilderFactory.class;
String classnameAsResource = pClass.getName().replace('.', '/') + ".class";
ClassLoader loader = pClass.getClassLoader();
if (loader == null) {
loader = ClassLoader.getSystemClassLoader();
}
URL targetTypeURL = loader.getResource(classnameAsResource);
throw new LinkageError("ClassCastException: attempting to cast"
+ delegate.getClass().getClassLoader().getResource(classnameAsResource)
+ "to" + targetTypeURL.toString());
}
return (ClientBuilderFactory>) delegate;
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
/**
* Create client instance using a custom client builder factory.
*
* @param client builder type.
* @param builderFactoryClass client builder factory class.
* @return client builder produced by the provided client builder factory,
*/
public static B newClientBy(Class> builderFactoryClass) {
return getFactory(builderFactoryClass).newBuilder();
}
/**
* Create new client instance using the default client builder factory provided
* by the JAX-RS implementation provider.
*
* @return new client instance.
*/
public static Client newClient() {
return getDefaultFactory().newBuilder().build();
}
/**
* Create new configured client instance using the default client builder factory
* provided by the JAX-RS implementation provider.
*
* @param configuration data used to provide initial configuration for the new
* client instance.
* @return new configured client instance.
*/
public static Client newClient(Configuration configuration) {
return getDefaultFactory().newBuilder().build(configuration);
}
/**
* Prevents instantiation.
*/
private ClientFactory() {
}
}