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EditingContextEventProcessorRegistry.java
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EditingContextEventProcessorRegistry.java
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/*******************************************************************************
* Copyright (c) 2019, 2023 Obeo.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.components.collaborative.editingcontext;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import org.eclipse.sirius.components.collaborative.api.IEditingContextEventProcessor;
import org.eclipse.sirius.components.collaborative.api.IEditingContextEventProcessorFactory;
import org.eclipse.sirius.components.collaborative.api.IEditingContextEventProcessorRegistry;
import org.eclipse.sirius.components.core.api.IEditingContext;
import org.eclipse.sirius.components.core.api.IEditingContextSearchService;
import org.eclipse.sirius.components.core.api.IInput;
import org.eclipse.sirius.components.core.api.IPayload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import reactor.core.Disposable;
import reactor.core.publisher.Mono;
/**
* Registry of the editing context event processors.
*
* @author sbegaudeau
*/
@Service
public class EditingContextEventProcessorRegistry implements IEditingContextEventProcessorRegistry {
private final Logger logger = LoggerFactory.getLogger(EditingContextEventProcessorRegistry.class);
private final IEditingContextEventProcessorFactory editingContextEventProcessorFactory;
private final IEditingContextSearchService editingContextSearchService;
private final Duration disposeDelay;
private final Map<String, EditingContextEventProcessorEntry> editingContextEventProcessors = new ConcurrentHashMap<>();
public EditingContextEventProcessorRegistry(IEditingContextEventProcessorFactory editingContextEventProcessorFactory, IEditingContextSearchService editingContextSearchService,
@Value("${sirius.components.editingContext.disposeDelay:1s}") Duration disposeDelay) {
this.editingContextEventProcessorFactory = editingContextEventProcessorFactory;
this.editingContextSearchService = Objects.requireNonNull(editingContextSearchService);
this.disposeDelay = disposeDelay;
}
@Override
public List<IEditingContextEventProcessor> getEditingContextEventProcessors() {
// @formatter:off
return this.editingContextEventProcessors.values().stream()
.map(EditingContextEventProcessorEntry::getEditingContextEventProcessor)
.collect(Collectors.toUnmodifiableList());
// @formatter:on
}
@Override
public Mono<IPayload> dispatchEvent(String editingContextId, IInput input) {
return this.getOrCreateEditingContextEventProcessor(editingContextId).map(processor -> processor.handle(input)).orElse(Mono.empty());
}
@Override
public synchronized Optional<IEditingContextEventProcessor> getOrCreateEditingContextEventProcessor(String editingContextId) {
Optional<IEditingContextEventProcessor> optionalEditingContextEventProcessor = Optional.empty();
if (this.editingContextSearchService.existsById(editingContextId)) {
optionalEditingContextEventProcessor = Optional.ofNullable(this.editingContextEventProcessors.get(editingContextId))
.map(EditingContextEventProcessorEntry::getEditingContextEventProcessor);
if (optionalEditingContextEventProcessor.isEmpty()) {
Optional<IEditingContext> optionalEditingContext = this.editingContextSearchService.findById(editingContextId);
if (optionalEditingContext.isPresent()) {
IEditingContext editingContext = optionalEditingContext.get();
var editingContextEventProcessor = this.editingContextEventProcessorFactory.createEditingContextEventProcessor(editingContext);
Disposable subscription = editingContextEventProcessor.canBeDisposed().delayElements(this.disposeDelay).subscribe(canBeDisposed -> {
// We will wait for the delay before trying to dispose the editing context event processor
// We will check if the editing context event processor is still empty
if (canBeDisposed.booleanValue() && editingContextEventProcessor.getRepresentationEventProcessors().isEmpty()) {
this.disposeEditingContextEventProcessor(editingContextId);
} else {
this.logger.trace("Stopping the disposal of the editing context");
}
});
var editingContextEventProcessorEntry = new EditingContextEventProcessorEntry(editingContextEventProcessor, subscription);
this.editingContextEventProcessors.put(editingContextId, editingContextEventProcessorEntry);
optionalEditingContextEventProcessor = Optional.of(editingContextEventProcessor);
}
}
}
return optionalEditingContextEventProcessor;
}
@Override
public void disposeEditingContextEventProcessor(String editingContextId) {
Optional.ofNullable(this.editingContextEventProcessors.remove(editingContextId)).ifPresent(EditingContextEventProcessorEntry::dispose);
this.logger.trace("Editing context event processors count: {}", this.editingContextEventProcessors.size());
}
public void dispose() {
this.logger.debug("Shutting down all the editing context event processors");
this.editingContextEventProcessors.values().forEach(EditingContextEventProcessorEntry::dispose);
this.editingContextEventProcessors.clear();
}
}