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12 changes: 12 additions & 0 deletions
12
packages/java/endpoint/src/main/java/com/vaadin/hilla/signals/NumberSignal.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,12 @@ | ||
| package com.vaadin.hilla.signals; | ||
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| import com.fasterxml.jackson.databind.node.IntNode; | ||
| import com.vaadin.hilla.signals.core.SignalQueue; | ||
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| public class NumberSignal extends SignalQueue<IntNode> { | ||
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| public NumberSignal(int defaultValue) { | ||
| super(IntNode.valueOf(defaultValue)); | ||
| } | ||
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| } |
29 changes: 29 additions & 0 deletions
29
...ges/java/endpoint/src/main/java/com/vaadin/hilla/signals/config/SignalsConfiguration.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package com.vaadin.hilla.signals.config; | ||
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| import com.vaadin.hilla.signals.core.SignalsHandler; | ||
| import com.vaadin.hilla.signals.core.SignalsRegistry; | ||
| import org.springframework.context.annotation.Bean; | ||
| import org.springframework.context.annotation.Configuration; | ||
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| @Configuration | ||
| public class SignalsConfiguration { | ||
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| private final SignalsRegistry signalsRegistry; | ||
| private final SignalsHandler signalsHandler; | ||
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| public SignalsConfiguration(SignalsRegistry signalsRegistry, | ||
| SignalsHandler signalsHandler) { | ||
| this.signalsRegistry = signalsRegistry; | ||
| this.signalsHandler = signalsHandler; | ||
| } | ||
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| @Bean | ||
| public SignalsRegistry signalsRegistry() { | ||
| return signalsRegistry; | ||
| } | ||
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| @Bean | ||
| public SignalsHandler signalsHandler() { | ||
| return signalsHandler; | ||
| } | ||
| } |
121 changes: 121 additions & 0 deletions
121
packages/java/endpoint/src/main/java/com/vaadin/hilla/signals/core/EventQueue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package com.vaadin.hilla.signals.core; | ||
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| import reactor.core.publisher.Flux; | ||
| import reactor.core.publisher.Sinks; | ||
| import reactor.core.publisher.Sinks.Many; | ||
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| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.UUID; | ||
| import java.util.concurrent.locks.ReentrantLock; | ||
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| public abstract class EventQueue<T extends StateEvent> { | ||
| private final ReentrantLock lock = new ReentrantLock(); | ||
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| public static final UUID ROOT = UUID | ||
| .fromString("FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF"); | ||
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| private static class Entry<T extends StateEvent> { | ||
| private final T value; | ||
| private Entry<T> next; | ||
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| private Entry(T value) { | ||
| this.value = value; | ||
| } | ||
| } | ||
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| private Entry<T> head; | ||
| private Entry<T> tail; | ||
| private final Map<UUID, Entry<T>> idToEntry = new HashMap<>(); | ||
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| private final Set<Many<T>> subscribers = new HashSet<>(); | ||
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| public Flux<T> subscribe(UUID continueFrom) { | ||
| System.out.println("Continue from " + continueFrom); | ||
| Many<T> sink = Sinks.many().multicast().onBackpressureBuffer(); | ||
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| return sink.asFlux().doOnSubscribe(ignore -> { | ||
| System.out.println("New Flux subscription"); | ||
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| lock.lock(); | ||
| try { | ||
| Entry<T> entry; | ||
| if (continueFrom != null | ||
| && (entry = idToEntry.get(continueFrom)) != null) { | ||
| entry = entry.next; | ||
| // TODO maybe some heuristic to determine whether it would | ||
| // be more efficient to restart from a snapshot instead of | ||
| // replaying lots of events? | ||
| while (entry != null) { | ||
| System.out.println("Replay " + entry.value.getId()); | ||
| sink.tryEmitNext(entry.value); | ||
| entry = entry.next; | ||
| } | ||
| ; | ||
| } else { | ||
| T snapshot = createSnapshot(); | ||
| if (snapshot != null) { | ||
| sink.tryEmitNext(snapshot); | ||
| } | ||
| } | ||
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| subscribers.add(sink); | ||
| } finally { | ||
| lock.unlock(); | ||
| } | ||
| }).doFinally(ignore -> { | ||
| System.out.println("doFinally"); | ||
| lock.lock(); | ||
| try { | ||
| subscribers.remove(sink); | ||
| } finally { | ||
| lock.unlock(); | ||
| } | ||
| }); | ||
| } | ||
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| public void submit(T event) { | ||
| // Thread.ofVirtual().start(() -> append(event)); | ||
| append(event); | ||
| } | ||
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| private void append(T event) { | ||
| lock.lock(); | ||
| try { | ||
| processEvent(event); | ||
| Entry<T> entry = new Entry<>(event); | ||
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| // Add to linked list | ||
| idToEntry.put(event.getId(), entry); | ||
| if (head == null) { | ||
| head = tail = entry; | ||
| } else { | ||
| tail.next = tail = entry; | ||
| } | ||
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| // Truncate list | ||
| // TODO configurable or dynamic limit? | ||
| if (idToEntry.size() > 100) { | ||
| Entry<T> removed = idToEntry.remove(head.value.getId()); | ||
| head = removed.next; | ||
| } | ||
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| // Notify subscribers | ||
| subscribers.removeIf(sink -> { | ||
| boolean failure = sink.tryEmitNext(event).isFailure(); | ||
| if (failure) { | ||
| System.out.println("Failed push"); | ||
| } | ||
| return failure; | ||
| }); | ||
| } finally { | ||
| lock.unlock(); | ||
| } | ||
| } | ||
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| protected abstract void processEvent(T newEvent); | ||
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| protected abstract T createSnapshot(); | ||
| } |
20 changes: 20 additions & 0 deletions
20
packages/java/endpoint/src/main/java/com/vaadin/hilla/signals/core/JsonEvent.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| package com.vaadin.hilla.signals.core; | ||
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| import com.fasterxml.jackson.databind.node.ObjectNode; | ||
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| import java.util.UUID; | ||
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| public class JsonEvent extends StateEvent { | ||
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| private final ObjectNode json; | ||
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| public JsonEvent(UUID id, ObjectNode json) { | ||
| super(id); | ||
| this.json = json; | ||
| } | ||
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| public ObjectNode getJson() { | ||
| return json; | ||
| } | ||
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| } |
40 changes: 40 additions & 0 deletions
40
packages/java/endpoint/src/main/java/com/vaadin/hilla/signals/core/JsonEventMapper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package com.vaadin.hilla.signals.core; | ||
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| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.databind.node.ObjectNode; | ||
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| import java.util.Map; | ||
| import java.util.UUID; | ||
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| public class JsonEventMapper { | ||
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| private final ObjectMapper mapper; | ||
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| public JsonEventMapper(ObjectMapper mapper) { | ||
| this.mapper = mapper; | ||
| } | ||
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| public String toJson(JsonEvent jsonEvent) { | ||
| ObjectNode root = mapper.createObjectNode(); | ||
| for (Map.Entry<String, JsonNode> entry : jsonEvent.getJson() | ||
| .properties()) { | ||
| root.set(entry.getKey(), entry.getValue()); | ||
| } | ||
| UUID id = jsonEvent.getId(); | ||
| root.put("id", id != null ? id.toString() : null); | ||
| return root.toString(); | ||
| } | ||
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| public JsonEvent fromJson(String json) { | ||
| try { | ||
| ObjectNode root = (ObjectNode) mapper.readTree(json); | ||
| UUID id = UUID.fromString(root.get("id").asText()); | ||
| root.remove("id"); | ||
| return new JsonEvent(id, root); | ||
| } catch (JsonProcessingException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
| } |
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