/** Accumulates fragments and passes the "big" message to the processing route. */
@Override
public void process(Exchange exchange) throws Exception {
String requestString = exchange.getIn().getBody(String.class);
Parser parser = getEndpoint().getHl7v2TransactionConfiguration().getParser();
Message requestMessage = parser.parse(requestString);
Terser requestTerser = new Terser(requestMessage);
String msh14 = requestTerser.get("MSH-14");
String dsc1 = null;
try {
if (!"I".equals(requestTerser.get("DSC-2"))) {
dsc1 = requestTerser.get("DSC-1");
}
} catch (HL7Exception e) {
// segment DSC does not exist in cancel requests
}
// pass when the message is not fragmented
if (isEmpty(msh14) && isEmpty(dsc1)) {
getWrappedProcessor().process(exchange);
return;
}
// get pieces of the accumulator's key
String msh31 = requestTerser.get("MSH-3-1");
String msh32 = requestTerser.get("MSH-3-2");
String msh33 = requestTerser.get("MSH-3-3");
// create an accumulator (on the arrival of the first fragment)
// or get an existing one (on the arrival of fragments 2..n)
StringBuilder accumulator;
if (isEmpty(msh14)) {
accumulator = new StringBuilder();
} else {
accumulator = storage.getAndRemove(keyString(msh14, msh31, msh32, msh33));
if (accumulator == null) {
LOG.warn("Pass unknown fragment with MSH-14=={} to the route", msh14);
getWrappedProcessor().process(exchange);
return;
}
}
// append current fragment to the accumulator
int beginIndex = isEmpty(msh14) ? 0 : requestString.indexOf('\r');
int endIndex = isEmpty(dsc1) ? requestString.length() : (requestString.indexOf("\rDSC") + 1);
accumulator.append(requestString, beginIndex, endIndex);
// DSC-1 is empty -- finish accumulation, pass message to the marshaller
if (isEmpty(dsc1)) {
LOG.debug("Finished fragment chain {}", msh14);
exchange.getIn().setBody(accumulator.toString());
getWrappedProcessor().process(exchange);
return;
}
// DSC-1 is not empty -- update accumulators map, request the next fragment
LOG.debug("Processed fragment {} requesting {}", msh14, dsc1);
storage.put(keyString(dsc1, msh31, msh32, msh33), accumulator);
Message ack = MessageUtils.response(requestMessage, "ACK", requestTerser.get("MSH-9-2"));
Terser ackTerser = new Terser(ack);
ackTerser.set("MSA-1", "CA");
ackTerser.set("MSA-2", requestTerser.get("MSH-10"));
Exchanges.resultMessage(exchange).setBody(parser.encode(ack));
}
