2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 Nordix Foundation.
4 * Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.models.base;
24 import jakarta.ws.rs.core.Response;
26 import java.util.concurrent.ConcurrentHashMap;
27 import lombok.AccessLevel;
28 import lombok.NoArgsConstructor;
29 import lombok.NonNull;
32 * The model service makes Policy Framework models available to all classes in a JVM.
34 * <p>The reason for having a model service is to avoid having to pass concept and model definitions down long call
35 * chains in modules such as the Policy Framework engine and editor. The model service makes the model and concept
36 * definitions available statically.
38 * <p>Note that the use of the model service means that only a single Policy Framework model of a particular type may
39 * exist in Policy Framework (particularly the engine) at any time. Of course the model in a JVM can be changed at any
40 * time provided all users of the model are stopped and restarted in an orderly manner.
42 @NoArgsConstructor(access = AccessLevel.PRIVATE)
43 public final class PfModelService {
44 // The map holding the models
45 private static final Map<String, PfConcept> modelMap = new ConcurrentHashMap<>();
48 * Register a model with the model service.
50 * @param <M> the generic type
51 * @param modelKey the key of the model, used to index the model
52 * @param model The model
54 public static <M extends PfConcept> void registerModel(@NonNull final String modelKey, @NonNull final M model) {
55 modelMap.put(modelKey, model);
59 * Remove a model from the model service.
61 * @param modelKey the key of the model, used to index the model
63 public static void deregisterModel(@NonNull final String modelKey) {
64 modelMap.remove(modelKey);
68 * Get a model from the model service.
70 * @param <M> the generic type
71 * @param modelKey the key of the model, used to index the model
74 @SuppressWarnings("unchecked")
75 public static <M extends PfConcept> M getModel(@NonNull final String modelKey) {
76 final var model = (M) modelMap.get(modelKey);
79 throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR,
80 "Model for name " + modelKey + " not found in model service");
87 * Check if a model is defined on the model service.
89 * @param modelKey the key of the model, used to index the model
90 * @return true if the model is defined
92 public static boolean existsModel(final String modelKey) {
93 return modelMap.get(modelKey) != null;
97 * Clear all models in the model service.
99 public static void clear() {