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// Service provider framework sketch

// Noninstantiable class for service registration and access - Pages 8-9

import java.util.*;

import java.util.concurrent.*;

public class Services {

private Services() { } // Prevents instantiation (Item 4)

// Maps service names to services

private static final Map<String, Provider> providers =

new ConcurrentHashMap<String, Provider>();

public static final String DEFAULT_PROVIDER_NAME = "<def>";

// Provider registration API

public static void registerDefaultProvider(Provider p) {

registerProvider(DEFAULT_PROVIDER_NAME, p);

}

public static void registerProvider(String name, Provider p){

providers.put(name, p);

}

// Service access API

public static Service newInstance() {

return newInstance(DEFAULT_PROVIDER_NAME);

}

public static Service newInstance(String name) {

Provider p = providers.get(name);

if (p == null)

throw new IllegalArgumentException(

"No provider registered with name: " + name);

return p.newService();

}

}