/**
* Keeps processing the {@link PendingRequest}s in the pending {@link Queue} until a QUIT is
* encountered in the pending queue. Thread will stop after processing the QUIT response (which
* is expected to be a {@link VirtualResponse}.
*
* <p>TODO: not entirely clear what is the best way to handle exceptions.
*
* <p>TODO: socket Reconnect in the context of pipelining is non-trivial, and maybe not even
* practically possible. (e.g. request n is sent but pipe breaks on some m (m!=n) response. non
* trivial.
*/
public void run() {
Log.log("AsyncConnection processor thread <%s> started.", Thread.currentThread().getName());
/** Response handler thread specific protocol handler -- optimize fencing */
Protocol protocol =
Assert.notNull(
newProtocolHandler(), "the delegate protocol handler", ClientRuntimeException.class);
PendingRequest pending = null;
while (true) {
try {
pending = pendingQueue.take();
try {
Request request =
Assert.notNull(
protocol.createRequest(pending.cmd, pending.args),
"request object from handler",
ProviderException.class);
request.write(getOutputStream());
pending.response = protocol.createResponse(pending.cmd);
pending.response.read(getInputStream());
pending.completion.signal();
if (pending.response.getStatus().isError()) {
Log.error(
"(Asynch) Error response for "
+ pending.cmd.code
+ " => "
+ pending.response.getStatus().message());
}
} catch (ProviderException bug) {
Log.error("ProviderException: " + bug.getLocalizedMessage());
bug.printStackTrace();
pending.setCRE(bug);
} catch (ClientRuntimeException cre) {
Log.error("ClientRuntimeException: " + cre.getLocalizedMessage());
cre.printStackTrace();
pending.setCRE(cre);
} catch (RuntimeException e) {
Log.error("Unexpected RuntimeException ", e);
e.printStackTrace();
pending.setCRE(
new ProviderException("Unexpected runtime exception in response handler"));
pending.setResponse(null);
break;
}
// redis (1.00) simply shutsdown connection even if pending responses
// are expected, so quit is NOT sent. we simply close connection on this
// end.
if (pending.cmd == Command.QUIT) {
AsyncConnection.this.disconnect();
break;
}
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
Log.log("AsyncConnection processor thread <%s> stopped.", Thread.currentThread().getName());
}
