2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2021 Nordix Foundation.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.clamp.controlloop.runtime.instantiation;
23 import java.io.IOException;
24 import java.util.HashSet;
25 import java.util.List;
27 import javax.ws.rs.core.Response;
29 import org.onap.policy.clamp.controlloop.common.handler.ControlLoopHandler;
30 import org.onap.policy.clamp.controlloop.runtime.instantiation.rest.InstantiationController;
31 import org.onap.policy.clamp.controlloop.runtime.main.parameters.ClRuntimeParameterGroup;
32 import org.onap.policy.common.endpoints.event.comm.TopicSink;
33 import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
34 import org.onap.policy.common.utils.services.Registry;
35 import org.onap.policy.models.base.PfModelRuntimeException;
38 * This class handles instantiation of control loop instances,
39 * so only one object of this type should be built at a time.
42 * It is effectively a singleton that is started at system start
44 public final class InstantiationHandler extends ControlLoopHandler {
47 private ControlLoopInstantiationProvider controlLoopInstantiationProvider;
50 * Gets the InstantiationHandler.
52 * @return InstantiationHandler
54 public static InstantiationHandler getInstance() {
55 return Registry.get(InstantiationHandler.class.getName());
61 * @param controlLoopParameters the parameters for access to the database
63 public InstantiationHandler(ClRuntimeParameterGroup controlLoopParameters) {
64 super(controlLoopParameters.getDatabaseProviderParameters());
68 public Set<Class<?>> getProviderClasses() {
69 Set<Class<?>> providerClasses = new HashSet<>();
71 providerClasses.add(InstantiationController.class);
73 return providerClasses;
77 public void startAndRegisterListeners(MessageTypeDispatcher msgDispatcher) {
78 // No topic communication on this handler
82 public void startAndRegisterPublishers(List<TopicSink> topicSinks) {
83 // No topic communication on this handler
87 public void stopAndUnregisterPublishers() {
88 // No topic communication on this handler
92 public void stopAndUnregisterListeners(MessageTypeDispatcher msgDispatcher) {
93 // No topic communication on this handler
97 public void startProviders() {
98 controlLoopInstantiationProvider = new ControlLoopInstantiationProvider(getDatabaseProviderParameters());
102 public void stopProviders() {
104 controlLoopInstantiationProvider.close();
105 } catch (IOException e) {
106 throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR, e.getMessage());