/**
* 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.jaxrs.sse;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import javax.ws.rs.sse.OutboundSseEvent;
import javax.ws.rs.sse.SseBroadcaster;
import javax.ws.rs.sse.SseEventSink;
public class SseBroadcasterImpl implements SseBroadcaster {
private final Set<SseEventSink> subscribers = new CopyOnWriteArraySet<>();
private final Set<Consumer<SseEventSink>> closers =
new CopyOnWriteArraySet<>();
private final Set<BiConsumer<SseEventSink, Throwable>> exceptioners =
new CopyOnWriteArraySet<>();
@Override
public void register(SseEventSink sink) {
subscribers.add(sink);
}
@Override
public CompletionStage<?> broadcast(OutboundSseEvent event) {
final Collection<CompletableFuture<?>> futures = new ArrayList<>();
for (SseEventSink sink: subscribers) {
try {
futures.add(sink.send(event).toCompletableFuture());
} catch (final Exception ex) {
exceptioners.forEach(exceptioner -> exceptioner.accept(sink, ex));
}
}
return CompletableFuture.allOf(futures.toArray(new CompletableFuture[futures.size()]));
}
@Override
public void onClose(Consumer<SseEventSink> subscriber) {
closers.add(subscriber);
}
@Override
public void onError(BiConsumer<SseEventSink, Throwable> exceptioner) {
exceptioners.add(exceptioner);
}
@Override
public void close() {
subscribers.forEach(subscriber -> {
subscriber.close();
closers.forEach(closer -> closer.accept(subscriber));
});
}
}