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* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.media.sse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.ConstrainedTo;
import javax.ws.rs.RuntimeType;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.inject.Inject;
import javax.inject.Provider;
import org.glassfish.jersey.message.MessageBodyWorkers;
/**
* Client-side single inbound Server-Sent Event reader.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@ConstrainedTo(RuntimeType.CLIENT)
class InboundEventReader implements MessageBodyReader {
private static final Logger LOGGER = Logger.getLogger(InboundEventReader.class.getName());
private static final byte[] EOL_DATA = new byte[]{'\n'};
@Inject
private Provider messageBodyWorkers;
private static enum State {
NEW_LINE,
COMMENT,
FIELD,
}
@Override
public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return InboundEvent.class.equals(type) && SseFeature.SERVER_SENT_EVENTS_TYPE.isCompatible(mediaType);
}
@Override
public InboundEvent readFrom(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap headers,
InputStream entityStream) throws IOException, WebApplicationException {
/**
* SSE Event parsing based on:
*
* http://dev.w3.org/html5/eventsource/
* last editors draft from 13 March 2012
*/
final ByteArrayOutputStream tokenData = new ByteArrayOutputStream();
InboundEvent.Builder eventBuilder = new InboundEvent.Builder(messageBodyWorkers.get(), annotations, mediaType, headers);
int b = -1;
State currentState = State.NEW_LINE;
loop:
do {
switch (currentState) {
case NEW_LINE:
b = entityStream.read();
if (b == '\n' || b == -1) {
break loop;
}
if (b == ':') {
currentState = State.COMMENT;
} else {
tokenData.write(b);
currentState = State.FIELD;
}
break;
case COMMENT:
// skipping comment data
b = readLineUntil(entityStream, '\n', null);
currentState = State.NEW_LINE;
break;
case FIELD:
// read field name
b = readLineUntil(entityStream, ':', tokenData);
final String fieldName = tokenData.toString();
tokenData.reset();
if (b == ':') {
// read field value
b = entityStream.read();
if (b == ' ') {
// first space in value has to be skipped
b = entityStream.read();
}
if (b != '\n' && b != -1) {
tokenData.write(b);
b = readLineUntil(entityStream, '\n', tokenData);
}
}
processField(eventBuilder, fieldName, tokenData.toByteArray());
tokenData.reset();
currentState = State.NEW_LINE;
break;
}
} while (b != -1);
return eventBuilder.build();
}
/**
* Read input stream until a delimiter or {@code EOL ('\n')} or {@code EOF} is reached
* and write the read data to the supplied output stream if not {@code null}, or discard
* the data if the output stream is {@code null}.
*
* @param in input stream to be read.
* @param delimiter delimiter to break the read (apart from {@code EOL ('\n')} or {@code EOF}).
* @param out output stream to write the read data to. May be {@code null}, in which case the
* read data are silently discarded.
* @return value of the last byte read.
* @throws IOException in case the reading or writing of the data failed.
*/
private int readLineUntil(InputStream in, int delimiter, OutputStream out) throws IOException {
int b;
while ((b = in.read()) != -1) {
if (b == delimiter || b == '\n') {
break;
} else if (out != null) {
out.write(b);
}
}
return b;
}
private void processField(InboundEvent.Builder inboundEventBuilder, String name, byte[] value) {
final String valueString = new String(value);
if ("event".equals(name)) {
inboundEventBuilder.name(valueString);
} else if ("data".equals(name)) {
inboundEventBuilder.write(value);
inboundEventBuilder.write(EOL_DATA);
} else if ("id".equals(name)) {
inboundEventBuilder.id(valueString);
} else if ("retry".equals(name)) {
try {
inboundEventBuilder.reconnectDelay(Long.parseLong(valueString));
} catch (NumberFormatException ex) {
LOGGER.log(Level.FINE, LocalizationMessages.IN_EVENT_RETRY_PARSE_ERROR(valueString), ex);
}
} else {
LOGGER.fine(LocalizationMessages.IN_EVENT_FIELD_NOT_RECOGNIZED(name, valueString));
}
}
}