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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.