public interface ServerListener<T extends Client> extends java.io.Closeable
Clientconnections on behalf of a
This interface exists primarily to abstract away the details of the
ServerSocket and the concurrency associated
with handling multiple clients. Such realities make it difficult to create
effective unit tests for the
ServerRunner that are easy to
understand and maintain.
This interface captures the only those details about the listener that the
ServerRunner cares about; namely, that it is something that has
an underlying resource (or resources) that need to be closed before the
listener is discarded.
T acceptClient() throws java.io.IOException, java.lang.InterruptedException
An implementation of this method is expected to block the calling thread and not return until either a client appears or an exception occurs.
Closeableresources associated with this listener.
Note that (as described in Doug Lea's discussion about interrupting I/O
operations in "Concurrent Programming in Java" (Addison-Wesley
Professional, 2nd edition, 1999) this method is used to interrupt
any blocked I/O operation in the client when the server is shutting
down. The client implementation must anticipate this potential,
and gracefully exit when the blocked I/O operation throws the
Note also, that unlike
Closeable.close() this method is not
permitted to propagate any
IOException that occurs when closing
the underlying resource(s).
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