ProcessorManagerImpl.java
/*
* #%L
* wcm.io
* %%
* Copyright (C) 2022 wcm.io
* %%
* 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.
* #L%
*/
package io.wcm.siteapi.processor.impl;
import java.util.Collections;
import java.util.SortedSet;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.stream.Stream;
import org.apache.sling.api.resource.Resource;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.osgi.framework.ServiceReference;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.FieldOption;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.osgi.service.component.annotations.ReferencePolicyOption;
import io.wcm.siteapi.processor.Processor;
import io.wcm.siteapi.processor.ProcessorManager;
import io.wcm.siteapi.processor.ProcessorMetadata;
import io.wcm.siteapi.processor.SlingHttpServletProcessor;
import io.wcm.sling.commons.caservice.ContextAwareServiceCollectionResolver;
import io.wcm.sling.commons.caservice.ContextAwareServiceResolver;
/**
* Collects all {@link SlingHttpServletProcessor} services and allows to get the matching processor for a given suffix.
*/
@Component(service = ProcessorManager.class)
public class ProcessorManagerImpl implements ProcessorManager {
@Reference
private ContextAwareServiceResolver serviceResolver;
@Reference(cardinality = ReferenceCardinality.MULTIPLE, fieldOption = FieldOption.UPDATE,
policy = ReferencePolicy.DYNAMIC, policyOption = ReferencePolicyOption.GREEDY)
private SortedSet<ServiceReference<Processor>> processors = new ConcurrentSkipListSet<>(Collections.reverseOrder());
private ContextAwareServiceCollectionResolver<Processor, ProcessorData> serviceCollectionResolver;
@Activate
private void activate() {
this.serviceCollectionResolver = serviceResolver.getCollectionResolver(
this.processors, ProcessorData::new);
}
@Deactivate
private void deactivate() {
this.serviceCollectionResolver.close();
}
/**
* Get processor matching for suffix.
* @param suffix Suffix
* @return Processor or null of no matching was found
*/
@Override
public @Nullable Processor getMatching(@NotNull String suffix, @NotNull Resource contextResource) {
return serviceCollectionResolver.resolveAllDecorated(contextResource)
.filter(ProcessorData::isValid)
.filter(processor -> processor.matches(suffix))
.map(ProcessorData::getProcessor)
.findFirst().orElse(null);
}
@Override
@SuppressWarnings("null")
public @NotNull Stream<ProcessorMetadata> getAll(@NotNull Resource contextResource) {
return serviceCollectionResolver.resolveAllDecorated(contextResource)
.filter(ProcessorData::isValid)
.map(ProcessorMetadata.class::cast);
}
}