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package org.glassfish.jersey.examples.aggregator;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import org.glassfish.jersey.media.sse.EventOutput;
import org.glassfish.jersey.media.sse.OutboundEvent;
import org.glassfish.jersey.media.sse.SseBroadcaster;
import org.glassfish.jersey.media.sse.SseFeature;
import org.glassfish.jersey.server.ChunkedOutput;
/**
* Resource that aggregates incoming messages and broadcasts them
* to the registered Server-Sent Even (SSE) client streams.
* <p>
* Uses the Jersey-specific SSE API.
*
* @see MessageStreamResourceJaxRs
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Path("message/stream/jersey")
public final class MessageStreamResourceJersey {
private static final Logger LOGGER = Logger.getLogger(MessageStreamResourceJersey.class.getName());
private static SseBroadcaster broadcaster = new SseBroadcaster() {
@Override
public void onException(final ChunkedOutput<OutboundEvent> chunkedOutput, final Exception exception) {
LOGGER.log(Level.SEVERE, "Error broadcasting message.", exception);
}
};
private static AtomicLong nextMessageId = new AtomicLong(0);
/**
* Put a new message to the stream.
*
* The message will be broadcast to all registered SSE clients.
*
* @param message message to be broadcast.
*/
@PUT
@Consumes(MediaType.APPLICATION_JSON)
public void putMessage(final Message message) {
LOGGER.info("--> Message received.");
final OutboundEvent event = new OutboundEvent.Builder()
.id(String.valueOf(nextMessageId.getAndIncrement()))
.mediaType(MediaType.APPLICATION_JSON_TYPE)
.data(Message.class, message)
.build();
broadcaster.broadcast(event);
}
/**
* Get the new SSE message stream channel.
*
* @return new SSE message stream channel.
*/
@GET
@Produces(SseFeature.SERVER_SENT_EVENTS)
public EventOutput getMessageStream() {
LOGGER.info("--> SSE connection received.");
final EventOutput eventOutput = new EventOutput();
broadcaster.add(eventOutput);
return eventOutput;
}
}