/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.nifi.cluster.manager;
import org.apache.nifi.cluster.protocol.NodeIdentifier;
import org.apache.nifi.web.api.entity.BulletinEntity;
import org.apache.nifi.web.api.entity.ComponentEntity;
import org.apache.nifi.web.api.entity.Permissible;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.apache.nifi.cluster.manager.BulletinMerger.BULLETIN_COMPARATOR;
import static org.apache.nifi.reporting.BulletinRepository.MAX_BULLETINS_PER_COMPONENT;
public interface ComponentEntityMerger<EntityType extends ComponentEntity & Permissible> {
/**
* Merges the ComponentEntity responses according to their {@link org.apache.nifi.web.api.dto.PermissionsDTO}s. Responsible for invoking
* {@link ComponentEntityMerger#mergeComponents(EntityType, Map)}.
*
* @param clientEntity the entity being returned to the client
* @param entityMap all node responses
*/
@SuppressWarnings("unchecked")
default void merge(final EntityType clientEntity, final Map<NodeIdentifier, EntityType> entityMap) {
for (final Map.Entry<NodeIdentifier, EntityType> entry : entityMap.entrySet()) {
final EntityType entity = entry.getValue();
PermissionsDtoMerger.mergePermissions(clientEntity.getPermissions(), entity.getPermissions());
}
if (clientEntity.getPermissions().getCanRead()) {
final Map<NodeIdentifier, List<BulletinEntity>> bulletinEntities = new HashMap<>();
for (final Map.Entry<NodeIdentifier, ? extends ComponentEntity> entry : entityMap.entrySet()) {
final NodeIdentifier nodeIdentifier = entry.getKey();
final ComponentEntity entity = entry.getValue();
// consider the bulletins if present and authorized
if (entity.getBulletins() != null) {
entity.getBulletins().forEach(bulletin -> {
bulletinEntities.computeIfAbsent(nodeIdentifier, nodeId -> new ArrayList<>()).add(bulletin);
});
}
}
clientEntity.setBulletins(BulletinMerger.mergeBulletins(bulletinEntities, entityMap.size()));
// sort the results
Collections.sort(clientEntity.getBulletins(), BULLETIN_COMPARATOR);
// prune the response to only include the max number of bulletins
if (clientEntity.getBulletins().size() > MAX_BULLETINS_PER_COMPONENT) {
clientEntity.setBulletins(clientEntity.getBulletins().subList(0, MAX_BULLETINS_PER_COMPONENT));
}
mergeComponents(clientEntity, entityMap);
} else {
clientEntity.setBulletins(null);
clientEntity.setComponent(null); // unchecked warning suppressed
}
}
/**
* Performs the merging of the entities. This method should not be called directly, it will be called by {@link ComponentEntityMerger#merge}.
* @param clientEntity the entity being returned to the client
* @param entityMap all node responses
*/
default void mergeComponents(final EntityType clientEntity, final Map<NodeIdentifier, EntityType> entityMap) {
}
}