/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.cxf.systest.jaxrs.sse;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.sse.OutboundSseEvent;
import javax.ws.rs.sse.OutboundSseEvent.Builder;
import javax.ws.rs.sse.Sse;
import javax.ws.rs.sse.SseBroadcaster;
import javax.ws.rs.sse.SseEventSink;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Path("/api/bookstore")
public class BookStore2 {
private static final Logger LOG = LoggerFactory.getLogger(BookStore2.class);
private final CountDownLatch latch = new CountDownLatch(2);
private Sse sse;
private SseBroadcaster broadcaster;
public BookStore2(@Context Sse sse) {
this.sse = sse;
this.broadcaster = sse.newBroadcaster();
}
@GET
@Produces(MediaType.APPLICATION_JSON)
public Collection<Book> books() {
return Arrays.asList(
new Book("New Book #1", 1),
new Book("New Book #2", 2)
);
}
@GET
@Path("sse/{id}")
@Produces(MediaType.SERVER_SENT_EVENTS)
public void forBook(@Context SseEventSink sink, @PathParam("id") final String id,
@HeaderParam(HttpHeaders.LAST_EVENT_ID_HEADER) @DefaultValue("0") final String lastEventId) {
new Thread() {
public void run() {
try {
final Integer id = Integer.valueOf(lastEventId);
final Builder builder = sse.newEventBuilder();
sink.send(createStatsEvent(builder.name("book"), id + 1));
Thread.sleep(200);
sink.send(createStatsEvent(builder.name("book"), id + 2));
Thread.sleep(200);
sink.send(createStatsEvent(builder.name("book"), id + 3));
Thread.sleep(200);
sink.send(createStatsEvent(builder.name("book"), id + 4));
Thread.sleep(200);
sink.close();
} catch (final InterruptedException ex) {
LOG.error("Communication error", ex);
}
}
}.start();
}
@GET
@Path("broadcast/sse")
@Produces(MediaType.SERVER_SENT_EVENTS)
public void broadcast(@Context SseEventSink sink) {
try {
broadcaster.register(sink);
} finally {
latch.countDown();
}
}
@POST
@Path("broadcast/close")
public void stop() {
try {
// Await a least 2 clients to be broadcasted over
if (!latch.await(10, TimeUnit.SECONDS)) {
LOG.warn("Not enough clients have been connected, closing broadcaster anyway");
}
final Builder builder = sse.newEventBuilder();
broadcaster.broadcast(createStatsEvent(builder.name("book"), 1000));
broadcaster.broadcast(createStatsEvent(builder.name("book"), 2000));
} catch (final InterruptedException ex) {
LOG.error("Wait has been interrupted", ex);
}
if (broadcaster != null) {
broadcaster.close();
}
}
private static OutboundSseEvent createStatsEvent(final OutboundSseEvent.Builder builder, final int eventId) {
return builder
.id(Integer.toString(eventId))
.data(Book.class, new Book("New Book #" + eventId, eventId))
.mediaType(MediaType.APPLICATION_JSON_TYPE)
.build();
}
}