| /* |
| * 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.controller.service; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.nifi.controller.ComponentNode; |
| import org.apache.nifi.controller.ProcessorNode; |
| import org.apache.nifi.controller.ReportingTaskNode; |
| |
| public class StandardControllerServiceReference implements ControllerServiceReference { |
| |
| private final ControllerServiceNode referenced; |
| private final Set<ComponentNode> components; |
| |
| public StandardControllerServiceReference(final ControllerServiceNode referencedService, final Set<ComponentNode> referencingComponents) { |
| this.referenced = referencedService; |
| this.components = new HashSet<>(referencingComponents); |
| } |
| |
| @Override |
| public ControllerServiceNode getReferencedComponent() { |
| return referenced; |
| } |
| |
| @Override |
| public Set<ComponentNode> getReferencingComponents() { |
| return Collections.unmodifiableSet(components); |
| } |
| |
| private boolean isRunning(final ComponentNode component) { |
| if (component instanceof ReportingTaskNode) { |
| return ((ReportingTaskNode) component).isRunning(); |
| } |
| |
| if (component instanceof ProcessorNode) { |
| return ((ProcessorNode) component).isRunning(); |
| } |
| |
| if (component instanceof ControllerServiceNode) { |
| return ((ControllerServiceNode) component).isActive(); |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public Set<ComponentNode> getActiveReferences() { |
| final Set<ComponentNode> activeReferences = new HashSet<>(); |
| |
| for (final ComponentNode component : components) { |
| if (isRunning(component)) { |
| activeReferences.add(component); |
| } |
| } |
| |
| for (final ComponentNode component : findRecursiveReferences(ComponentNode.class)) { |
| if (isRunning(component)) { |
| activeReferences.add(component); |
| } |
| } |
| |
| return activeReferences; |
| } |
| |
| |
| @Override |
| public <T> List<T> findRecursiveReferences(final Class<T> componentType) { |
| return findRecursiveReferences(referenced, componentType); |
| } |
| |
| private <T> List<T> findRecursiveReferences(final ControllerServiceNode referencedNode, final Class<T> componentType) { |
| return findRecursiveReferences(referencedNode, componentType, new HashSet<>()); |
| } |
| |
| private <T> List<T> findRecursiveReferences(final ControllerServiceNode referencedNode, final Class<T> componentType, final Set<ControllerServiceNode> servicesVisited) { |
| final List<T> references = new ArrayList<>(); |
| |
| for (final ComponentNode referencingComponent : referencedNode.getReferences().getReferencingComponents()) { |
| if (componentType.isAssignableFrom(referencingComponent.getClass())) { |
| references.add(componentType.cast(referencingComponent)); |
| } |
| |
| if (referencingComponent instanceof ControllerServiceNode) { |
| final ControllerServiceNode referencingNode = (ControllerServiceNode) referencingComponent; |
| |
| // find components recursively that depend on referencingNode. |
| final boolean added = servicesVisited.add(referencingNode); |
| if (added) { |
| final List<T> recursive = findRecursiveReferences(referencingNode, componentType, servicesVisited); |
| |
| // For anything that depends on referencing node, we want to add it to the list, but we know |
| // that it must come after the referencing node, so we first remove any existing occurrence. |
| references.removeAll(recursive); |
| references.addAll(recursive); |
| } |
| } |
| } |
| |
| return references; |
| } |
| |
| } |