Jar File Spec provides a simple service provider mechanism: a provider configuration file is located inside META-INF/services/, with the service interface or abstract class name as the configuration file name, which contains the list of implementing class names. Java 1.6 has a ServiceLoader class for looking up service providers.
It will be handy to define a well known interface, and to use the provider configuration file to list all implementations. Thus at runtime, ServiceLoader can be used to iterate all available service providers.
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