@Override
protected void decode(ChannelHandlerContext ctx, RESPONSE msg, List<Object> out)
throws Exception {
if (currentDecodingState == DecodingState.INITIAL) {
currentRequest = sentRequestQueue.poll();
currentDecodingState = DecodingState.STARTED;
if (currentRequest != null) {
Long st = sentRequestTimings.poll();
if (st != null) {
currentOpTime = System.nanoTime() - st;
} else {
currentOpTime = -1;
}
}
if (traceEnabled) {
LOGGER.trace("{}Started decoding of {}", logIdent(ctx, endpoint), currentRequest);
}
}
try {
CouchbaseResponse response = decodeResponse(ctx, msg);
if (response != null) {
publishResponse(response, currentRequest.observable());
if (currentDecodingState == DecodingState.FINISHED) {
if (currentRequest != null
&& currentOpTime >= 0
&& env() != null
&& env().networkLatencyMetricsCollector().isEnabled()) {
NetworkLatencyMetricsIdentifier identifier =
new NetworkLatencyMetricsIdentifier(
remoteHostname,
serviceType().toString(),
currentRequest.getClass().getSimpleName(),
response.status().toString());
env().networkLatencyMetricsCollector().record(identifier, currentOpTime);
}
}
}
} catch (CouchbaseException e) {
currentRequest.observable().onError(e);
} catch (Exception e) {
currentRequest.observable().onError(new CouchbaseException(e));
}
if (currentDecodingState == DecodingState.FINISHED) {
if (traceEnabled) {
LOGGER.trace("{}Finished decoding of {}", logIdent(ctx, endpoint), currentRequest);
}
currentRequest = null;
currentDecodingState = DecodingState.INITIAL;
}
}
/**
* Override to customize the behavior when a keep alive has been responded to.
*
* <p>The default behavior is to log the event and the response status at trace level.
*
* @param ctx the channel context.
* @param keepAliveResponse the keep alive request that was sent when keep alive was triggered
*/
protected void onKeepAliveResponse(
ChannelHandlerContext ctx, CouchbaseResponse keepAliveResponse) {
if (traceEnabled) {
LOGGER.trace(
logIdent(ctx, endpoint) + "keepAlive was answered, status " + keepAliveResponse.status());
}
}
/**
* Publishes a response with the attached observable.
*
* @param response the response to publish.
* @param observable pushing into the event sink.
*/
protected void publishResponse(
final CouchbaseResponse response,
final Subject<CouchbaseResponse, CouchbaseResponse> observable) {
if (response.status() != ResponseStatus.RETRY && observable != null) {
final Scheduler.Worker worker = env().scheduler().createWorker();
worker.schedule(
new Action0() {
@Override
public void call() {
try {
observable.onNext(response);
observable.onCompleted();
} catch (Exception ex) {
LOGGER.warn("Caught exception while onNext on observable", ex);
observable.onError(ex);
} finally {
worker.unsubscribe();
}
}
});
} else {
responseBuffer.publishEvent(ResponseHandler.RESPONSE_TRANSLATOR, response, observable);
}
}