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io.atomix.rest.resources.EventsResource Maven / Gradle / Ivy
/*
* Copyright 2017-present Open Networking Foundation
*
* Licensed 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 io.atomix.rest.resources;
import com.google.common.util.concurrent.MoreExecutors;
import io.atomix.cluster.messaging.ClusterEventService;
import io.atomix.cluster.messaging.Subscription;
import io.atomix.rest.AtomixResource;
import io.atomix.rest.impl.EventLog;
import io.atomix.rest.impl.EventManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.container.Suspended;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.stream.Collectors;
/**
* Events resource.
*/
@AtomixResource
@Path("/events")
public class EventsResource {
private static final Logger LOGGER = LoggerFactory.getLogger(EventsResource.class);
private static final int UUID_STRING_LENGTH = UUID.randomUUID().toString().length();
/**
* Returns an event log name.
*/
private String getEventLogName(String subject, String id) {
return String.format("%s-%s", subject, id);
}
@POST
@Path("/{subject}")
@Consumes(MediaType.TEXT_PLAIN)
public Response publish(@PathParam("subject") String subject, @Context ClusterEventService eventService, String body) {
eventService.broadcast(subject, body);
return Response.ok().build();
}
@GET
@Path("/{subject}")
@Produces(MediaType.TEXT_PLAIN)
public void next(@PathParam("subject") String subject, @Context ClusterEventService eventService, @Context EventManager events, @Suspended AsyncResponse response) {
EventLog, String> eventLog = events.getOrCreateEventLog(
ClusterEventService.class, subject, l -> e -> l.addEvent(e));
CompletableFuture openFuture;
if (eventLog.open()) {
openFuture = eventService.subscribe(subject, eventLog.listener(), MoreExecutors.directExecutor());
} else {
openFuture = CompletableFuture.completedFuture(null);
}
openFuture.whenComplete((result, error) -> {
if (error == null) {
eventLog.nextEvent().whenComplete((event, eventError) -> {
if (eventError == null) {
response.resume(Response.ok(event).build());
} else {
response.resume(Response.noContent().build());
}
});
} else {
LOGGER.warn("{}", error);
response.resume(Response.serverError().build());
}
});
}
@DELETE
@Path("/{subject}")
public void delete(@PathParam("subject") String subject, @Context ClusterEventService eventService, @Context EventManager events, @Suspended AsyncResponse response) {
EventLog, String> eventLog = events.removeEventLog(ClusterEventService.class, subject);
if (eventLog != null && eventLog.close()) {
List subscriptions = eventService.getSubscriptions(subject);
if (subscriptions != null && !subscriptions.isEmpty()) {
subscriptions.get(0).close().whenComplete((result, error) -> {
response.resume(Response.ok().build());
});
}
}
}
@GET
@Path("/{subject}/subscribers")
@Produces(MediaType.APPLICATION_JSON)
public Response getSubscribers(@PathParam("subject") String subject, @Context EventManager events) {
return Response.ok(events.getEventLogNames(ClusterEventService.class)
.stream()
.filter(name -> name.length() == subject.length() + 1 + UUID_STRING_LENGTH && name.substring(0, name.length() - UUID_STRING_LENGTH - 1).equals(subject))
.map(name -> name.substring(subject.length() + 1))
.collect(Collectors.toList())).build();
}
@POST
@Path("/{subject}/subscribers")
@Produces(MediaType.TEXT_PLAIN)
public void subscribe(@PathParam("subject") String subject, @Context ClusterEventService eventService, @Context EventManager events, @Suspended AsyncResponse response) {
String id = UUID.randomUUID().toString();
EventLog, String> eventLog = events.getOrCreateEventLog(
ClusterEventService.class, getEventLogName(subject, id), l -> e -> l.addEvent(e));
eventService.subscribe(subject, eventLog.listener(), MoreExecutors.directExecutor())
.whenComplete((result, error) -> {
if (error == null) {
response.resume(Response.ok(id).build());
} else {
LOGGER.warn("{}", error);
response.resume(Response.serverError().build());
}
});
}
@GET
@Path("/{subject}/subscribers/{id}")
@Produces(MediaType.TEXT_PLAIN)
public void nextSession(@PathParam("subject") String subject, @PathParam("id") String id, @Context EventManager events, @Suspended AsyncResponse response) {
EventLog, String> eventLog = events.getEventLog(ClusterEventService.class, getEventLogName(subject, id));
if (eventLog == null) {
LOGGER.warn("Unknown subscriber {}", id);
response.resume(Response.status(Status.NOT_FOUND).build());
return;
}
eventLog.nextEvent().whenComplete((event, error) -> {
if (error == null) {
response.resume(Response.ok(event).build());
} else {
LOGGER.warn("Subscriber {} closed", id);
response.resume(Response.noContent().build());
}
});
}
@DELETE
@Path("/{subject}/subscribers/{id}")
public void unsubscribe(@PathParam("subject") String subject, @PathParam("id") String id, @Context ClusterEventService eventService, @Context EventManager events, @Suspended AsyncResponse response) {
EventLog, String> eventLog = events.getEventLog(ClusterEventService.class, getEventLogName(subject, id));
if (eventLog != null && eventLog.close()) {
List subscriptions = eventService.getSubscriptions(subject);
if (subscriptions != null && !subscriptions.isEmpty()) {
// TODO: This is not closing the correct subscription
subscriptions.get(0).close().whenComplete((result, error) -> {
response.resume(Response.ok().build());
});
}
}
}
}