Service provider interface
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Service Provider Interface (SPI) is a software mechanism to support replaceable components.
It is the implementer-side equivalent of an API; a set of hooks that can or must be overriden.
In the Java world, SPI are for instance used in JDBC, JCE, JNDI, JAXP, JBI and Java Image I/O.
See Replaceable Components and the Service Provider Interface for more information.