public abstract class ConcurrentServerRunner<T extends Client> extends ContextAwareBase implements Runnable, ServerRunner<T>
An instance of this object is created with a
Executor. On invocation of the
start() method, it
passes itself to the given
Executor and returns immediately. On
invocation of its
run() method by the
Executor it begins
accepting client connections via its
ServerListener. As each
Client is accepted, the client is configured with the
runner's LoggingContext and is then passed to the
Executor for concurrent execution of the client's service loop.
On invocation of the
stop() method, the runner closes the listener
and each of the connected clients (by invoking
effectively interrupting any blocked I/O calls and causing these concurrent
subtasks to exit gracefully). This ensures that before the
method returns (1) all I/O resources have been released and (2) all
of the threads of the
Executor are idle.
|Constructor and Description|
Constructs a new server runner.
|Modifier and Type||Method and Description|
Presents each connected client to the given visitor.
Configures a connected client.
Gets a flag indicating whether the server is currently running.
Stops execution of the runner.
addError, addError, addInfo, addInfo, addStatus, addWarn, addWarn, getContext, getDeclaredOrigin, getStatusManager, setContext
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public ConcurrentServerRunner(ServerListener<T> listener, Executor executor)
listener- the listener from which the server will accept new clients
executor- a executor that will facilitate execution of the listening and client-handling tasks; while any
Executoris allowed here, outside of unit testing the only reasonable choice is a bounded thread pool of some kind.
public boolean isRunning()
protected void setRunning(boolean running)
public void stop() throws IOException
This method must cause all I/O and thread resources associated with the runner to be released. If the receiver has not been started, this method must have no effect.
public void accept(ClientVisitor<T> visitor)
protected abstract boolean configureClient(T client)
A subclass implements this method to perform any necessary configuration
of the client object before its
Runnable.run() method is invoked.
client- the subject client
trueif configuration was successful; if the return value is
falsethe client connection will be dropped
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