/**
* Change the response code for this response. If not specified, the code will be a {@code 200}.
* Setting the response code after the response headers have been transmitted has no effect.
*
* @param responseCode the new code
* @throws IllegalStateException if a response or upgrade was already sent
*/
public void setResponseCode(final int responseCode) {
if (responseCode < 0 || responseCode > 999) {
throw new IllegalArgumentException("Invalid response code");
}
int oldVal, newVal;
do {
oldVal = state;
if (allAreSet(oldVal, FLAG_RESPONSE_SENT)) {
throw UndertowMessages.MESSAGES.responseAlreadyStarted();
}
newVal = oldVal & ~MASK_RESPONSE_CODE | responseCode & MASK_RESPONSE_CODE;
} while (!stateUpdater.compareAndSet(this, oldVal, newVal));
}
/**
* Transmit the response headers. After this method successfully returns, the response channel may
* become writable.
*
* <p>If this method fails the request and response channels will be closed.
*
* <p>This method runs asynchronously. If the channel is writable it will attempt to write as much
* of the response header as possible, and then queue the rest in a listener and return.
*
* <p>If future handlers in the chain attempt to write before this is finished XNIO will just
* magically sort it out so it works. This is not actually implemented yet, so we just terminate
* the connection straight away at the moment.
*
* <p>TODO: make this work properly
*
* @throws IllegalStateException if the response headers were already sent
*/
void startResponse() throws IllegalStateException {
int oldVal, newVal;
do {
oldVal = state;
if (allAreSet(oldVal, FLAG_RESPONSE_SENT)) {
throw UndertowMessages.MESSAGES.responseAlreadyStarted();
}
newVal = oldVal | FLAG_RESPONSE_SENT;
} while (!stateUpdater.compareAndSet(this, oldVal, newVal));
log.tracef(
"Starting to write response for %s using channel %s", this, underlyingResponseChannel);
final HeaderMap responseHeaders = this.responseHeaders;
responseHeaders.lock();
}