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package org.glassfish.jersey.media.sse;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.inject.Inject;
import javax.inject.Provider;
import org.glassfish.jersey.message.MessageBodyWorkers;
/**
* Writer for {@link OutboundEvent}.
*
* @author Pavel Bucek (pavel.bucek at oracle.com)
* @author Marek Potociar (marek.potociar at oracle.com)
*/
class OutboundEventWriter implements MessageBodyWriter {
private static final byte[] COMMENT_LEAD= ": ".getBytes();
private static final byte[] NAME_LEAD= "event: ".getBytes();
private static final byte[] ID_LEAD= "id: ".getBytes();
private static final byte[] RETRY_LEAD= "retry: ".getBytes();
private static final byte[] DATA_LEAD= "data: ".getBytes();
private static final byte[] EOL= {'\n'};
@Inject
private Provider workersProvider;
@Override
public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return type.equals(OutboundEvent.class) && SseFeature.SERVER_SENT_EVENTS_TYPE.isCompatible(mediaType);
}
@Override
public long getSize(OutboundEvent incomingEvent,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return -1;
}
@Override
@SuppressWarnings("unchecked")
public void writeTo(OutboundEvent outboundEvent,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
final OutputStream entityStream) throws IOException, WebApplicationException {
if (outboundEvent.getComment() != null) {
for (String comment : outboundEvent.getComment().split("\n")) {
entityStream.write(COMMENT_LEAD);
entityStream.write(comment.getBytes());
entityStream.write(EOL);
}
}
if (outboundEvent.getType() != null) {
if (outboundEvent.getName() != null) {
entityStream.write(NAME_LEAD);
entityStream.write(outboundEvent.getName().getBytes());
entityStream.write(EOL);
}
if (outboundEvent.getId() != null) {
entityStream.write(ID_LEAD);
entityStream.write(outboundEvent.getId().getBytes());
entityStream.write(EOL);
}
if (outboundEvent.getReconnectDelay() > SseFeature.RECONNECT_NOT_SET) {
entityStream.write(RETRY_LEAD);
entityStream.write(Long.toString(outboundEvent.getReconnectDelay()).getBytes());
entityStream.write(EOL);
}
final MediaType eventMediaType =
outboundEvent.getMediaType() == null ? MediaType.TEXT_PLAIN_TYPE : outboundEvent.getMediaType();
final MessageBodyWriter messageBodyWriter = workersProvider.get().getMessageBodyWriter(outboundEvent.getType(),
outboundEvent.getGenericType(), annotations, eventMediaType);
messageBodyWriter.writeTo(
outboundEvent.getData(),
outboundEvent.getType(),
outboundEvent.getGenericType(),
annotations,
eventMediaType,
httpHeaders,
new OutputStream() {
private boolean start = true;
@Override
public void write(int i) throws IOException {
if (start) {
entityStream.write(DATA_LEAD);
start = false;
}
entityStream.write(i);
if (i == '\n') {
entityStream.write(DATA_LEAD);
}
}
});
}
}
}