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Jersey Jakarta RESTfule Web Services 3.0 Server-Sent Events example.
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/*
 * Copyright (c) 2017, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.jersey.examples.sse.jaxrs;

import java.net.URI;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import jakarta.ws.rs.DefaultValue;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.NotFoundException;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.PathParam;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.QueryParam;
import jakarta.ws.rs.core.Context;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.core.UriBuilder;
import jakarta.ws.rs.sse.Sse;
import jakarta.ws.rs.sse.SseBroadcaster;
import jakarta.ws.rs.sse.SseEventSink;

/**
 * @author Pavel Bucek
 * @author Adam Lindenthal
 */
@Path("domain")
public class DomainResource {

    private static final Map processes = new ConcurrentHashMap<>();

    @Path("start")
    @POST
    public Response post(@DefaultValue("0") @QueryParam("testSources") int testSources, @Context Sse sse) {
        final Process process = new Process(testSources, sse);
        processes.put(process.getId(), process);

        Executors.newSingleThreadExecutor().execute(process);

        final URI processIdUri = UriBuilder.fromResource(DomainResource.class).path("process/{id}").build(process.getId());
        return Response.created(processIdUri).build();
    }

    @Path("process/{id}")
    @Produces(MediaType.SERVER_SENT_EVENTS)
    @GET
    public void getProgress(@PathParam("id") int id,
                            @DefaultValue("false") @QueryParam("testSource") boolean testSource,
                            @Context SseEventSink eventSink) {
        final Process process = processes.get(id);

        if (process != null) {
            if (testSource) {
                process.release();
            }
            process.getBroadcaster().register(eventSink);
        } else {
            throw new NotFoundException();
        }
    }

    static class Process implements Runnable {

        private static final AtomicInteger counter = new AtomicInteger(0);

        private final int id;
        private final CountDownLatch latch;
        private final SseBroadcaster broadcaster;
        private final Sse sse;

        Process(int testReceivers, Sse sse) {
            this.sse = sse;
            this.broadcaster = sse.newBroadcaster();
            id = counter.incrementAndGet();
            latch = testReceivers > 0 ? new CountDownLatch(testReceivers) : null;
        }

        int getId() {
            return id;
        }

        SseBroadcaster getBroadcaster() {
            return broadcaster;
        }

        void release() {
            if (latch != null) {
                latch.countDown();
            }
        }

        public void run() {
            try {
                if (latch != null) {
                    // wait for all test EventSources to be registered
                    latch.await(5, TimeUnit.SECONDS);
                }

                broadcaster.broadcast(sse.newEventBuilder()
                                         .name("domain-progress")
                                         .data(String.class, "starting domain " + id + " ...")
                                         .build());
                broadcaster.broadcast(sse.newEventBuilder().name("domain-progress").data(String.class, "50%").build());
                broadcaster.broadcast(sse.newEventBuilder().name("domain-progress").data(String.class, "60%").build());
                broadcaster.broadcast(sse.newEventBuilder().name("domain-progress").data(String.class, "70%").build());
                broadcaster.broadcast(sse.newEventBuilder().name("domain-progress").data(String.class, "99%").build());
                broadcaster.broadcast(sse.newEventBuilder().name("domain-progress").data(String.class, "done").build());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}