/** A constructor for creating message headers from a parsed STOMP frame. */
StompHeaderAccessor(StompCommand command, Map<String, List<String>> externalSourceHeaders) {
super(command.getMessageType(), externalSourceHeaders);
setHeader(COMMAND_HEADER, command);
updateSimpMessageHeadersFromStompHeaders();
}
/** Decode a single STOMP frame from the given {@code buffer} into a {@link Message}. */
private Message<byte[]> decodeMessage(ByteBuffer buffer, MultiValueMap<String, String> headers) {
Message<byte[]> decodedMessage = null;
skipLeadingEol(buffer);
buffer.mark();
String command = readCommand(buffer);
if (command.length() > 0) {
StompHeaderAccessor headerAccessor = null;
byte[] payload = null;
if (buffer.remaining() > 0) {
StompCommand stompCommand = StompCommand.valueOf(command);
headerAccessor = StompHeaderAccessor.create(stompCommand);
initHeaders(headerAccessor);
readHeaders(buffer, headerAccessor);
payload = readPayload(buffer, headerAccessor);
}
if (payload != null) {
if ((payload.length > 0) && (!headerAccessor.getCommand().isBodyAllowed())) {
throw new StompConversionException(
headerAccessor.getCommand()
+ " shouldn't have a payload: length="
+ payload.length
+ ", headers="
+ headers);
}
headerAccessor.updateSimpMessageHeadersFromStompHeaders();
headerAccessor.setLeaveMutable(true);
decodedMessage = MessageBuilder.createMessage(payload, headerAccessor.getMessageHeaders());
if (logger.isDebugEnabled()) {
logger.debug("Decoded " + decodedMessage);
}
} else {
if (logger.isTraceEnabled()) {
logger.trace("Received incomplete frame. Resetting buffer.");
}
if (headers != null && headerAccessor != null) {
String name = NativeMessageHeaderAccessor.NATIVE_HEADERS;
@SuppressWarnings("unchecked")
MultiValueMap<String, String> map =
(MultiValueMap<String, String>) headerAccessor.getHeader(name);
if (map != null) {
headers.putAll(map);
}
}
buffer.reset();
}
} else {
if (logger.isTraceEnabled()) {
logger.trace("Decoded heartbeat");
}
StompHeaderAccessor headerAccessor = StompHeaderAccessor.createForHeartbeat();
initHeaders(headerAccessor);
headerAccessor.setLeaveMutable(true);
decodedMessage =
MessageBuilder.createMessage(HEARTBEAT_PAYLOAD, headerAccessor.getMessageHeaders());
}
return decodedMessage;
}