2 * ========================LICENSE_START=================================
4 * ======================================================================
5 * Copyright (C) 2020-2023 Nordix Foundation. All rights reserved.
6 * Copyright (C) 2024 OpenInfra Foundation Europe. All rights reserved.
7 * ======================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 * ========================LICENSE_END===================================
22 package org.onap.ccsdk.oran.a1policymanagementservice.clients;
24 import java.lang.invoke.MethodHandles;
25 import java.lang.reflect.Constructor;
27 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1Client.A1ProtocolType;
28 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
29 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ControllerConfig;
30 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.RicConfig;
31 import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
32 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
33 import org.slf4j.Logger;
34 import org.slf4j.LoggerFactory;
36 import reactor.core.publisher.Mono;
39 * Factory for A1 clients that supports four different protocol versions of the
42 public class A1ClientFactory {
44 private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
46 private final ApplicationConfig appConfig;
48 private final AsyncRestClientFactory restClientFactory;
50 public A1ClientFactory(ApplicationConfig appConfig, SecurityContext securityContext) {
51 this.appConfig = appConfig;
52 this.restClientFactory = new AsyncRestClientFactory(appConfig.getWebClientConfig(), securityContext);
56 * Creates an A1 client with the correct A1 protocol for the provided Ric.
59 * It detects the protocol version by trial and error, since there is no
60 * getVersion method specified in the A1 api yet.
63 * As a side effect it also sets the protocol version in the provided Ric. This
64 * means that after the first successful creation it won't have to try which
65 * protocol to use, but can create the client directly.
67 * @param ric The Near-RT RIC to get a client for.
68 * @return a client with the correct protocol, or a ServiceException if none of
69 * the protocols are supported by the Near-RT RIC.
71 public Mono<A1Client> createA1Client(Ric ric) {
72 return getProtocolVersion(ric) //
73 .flatMap(version -> createA1ClientMono(ric, version));
76 A1Client createClient(Ric ric, A1ProtocolType version) throws ServiceException {
77 if (version == A1ProtocolType.STD_V1_1) {
78 assertNoControllerConfig(ric, version);
79 return new StdA1ClientVersion1(ric.getConfig(), this.restClientFactory);
80 } else if (version == A1ProtocolType.STD_V2_0_0) {
81 assertNoControllerConfig(ric, version);
82 return new StdA1ClientVersion2(ric.getConfig(), this.restClientFactory);
83 } else if (version == A1ProtocolType.OSC_V1) {
84 assertNoControllerConfig(ric, version);
85 return new OscA1Client(ric.getConfig(), this.restClientFactory);
86 } else if (version == A1ProtocolType.CCSDK_A1_ADAPTER_STD_V1_1
87 || version == A1ProtocolType.CCSDK_A1_ADAPTER_OSC_V1
88 || version == A1ProtocolType.CCSDK_A1_ADAPTER_STD_V2_0_0) {
89 return new CcsdkA1AdapterClient(version, ric.getConfig(), this.restClientFactory);
90 } else if (version == A1ProtocolType.CUSTOM_PROTOCOL) {
91 return createCustomAdapter(ric);
93 logger.error("Unhandled protocol: {}", version);
94 throw new ServiceException("Unhandled protocol");
98 private ControllerConfig getControllerConfig(Ric ric) throws ServiceException {
99 ControllerConfig controllerConfig = ric.getConfig().getControllerConfig();
100 if (controllerConfig == null) {
101 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
102 throw new ServiceException("No controller configured for Near-RT RIC: " + ric.id());
104 return controllerConfig;
107 private A1Client createCustomAdapter(Ric ric) throws ServiceException {
109 if (ric.getConfig().getCustomAdapterClass() != null && !ric.getConfig().getCustomAdapterClass().isEmpty()) {
110 Class<?> clazz = Class.forName(ric.getConfig().getCustomAdapterClass());
111 if (A1Client.class.isAssignableFrom(clazz)) {
112 Constructor<?> constructor = clazz.getConstructor(RicConfig.class, AsyncRestClientFactory.class);
113 logger.debug("A1Client (" + clazz.getTypeName() + ") being created for ric: {}",
114 ric.getConfig().getRicId());
115 return (A1Client) constructor.newInstance(ric.getConfig(), this.restClientFactory);
116 } else if (A1Client.Factory.class.isAssignableFrom(clazz)) {
117 A1Client.Factory factory = (A1Client.Factory) clazz.getDeclaredConstructor().newInstance();
118 logger.debug("A1Client (" + clazz.getTypeName() + ") factory creating client for ric: {}",
119 ric.getConfig().getRicId());
120 return factory.create(ric.getConfig(), this.restClientFactory);
122 throw new ServiceException("The custom class must either implement A1Client.Factory or A1Client");
125 throw new ServiceException("Custom adapter class is required to use A1ProtocolType.CUSTOM_PROTOCOL");
127 } catch (ClassNotFoundException e) {
128 throw new ServiceException("Could not find class: " + ric.getConfig().getCustomAdapterClass(), e);
129 } catch (NoSuchMethodException e) {
130 throw new ServiceException("Could not find the required constructor in class "
131 + ric.getConfig().getCustomAdapterClass(), e);
132 } catch (ServiceException e) {
134 } catch (Exception e) {
135 throw new ServiceException("Cannot create custom adapter: " + ric.getConfig().getCustomAdapterClass(), e);
139 private void assertNoControllerConfig(Ric ric, A1ProtocolType version) throws ServiceException {
140 if (ric.getConfig().getControllerConfig() != null) {
141 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
142 throw new ServiceException(
143 "Controller config should be empty, ric: " + ric.id() + " when using protocol version: " + version);
147 private Mono<A1Client> createA1ClientMono(Ric ric, A1ProtocolType version) {
149 return Mono.just(createClient(ric, version));
150 } catch (ServiceException e) {
151 return Mono.error(e);
155 private Mono<A1Client.A1ProtocolType> getProtocolVersion(Ric ric) {
156 if (ric.getProtocolVersion() == A1ProtocolType.UNKNOWN) {
157 return fetchVersion(ric, A1ProtocolType.STD_V2_0_0) //
158 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.STD_V1_1)) //
159 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.OSC_V1)) //
160 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.CCSDK_A1_ADAPTER_STD_V1_1)) //
161 .doOnNext(ric::setProtocolVersion)
162 .doOnNext(version -> logger.debug("Established protocol version:{} for Near-RT RIC: {}", version,
164 .doOnError(notUsed -> logger.warn("Could not get protocol version from Near-RT RIC: {}", ric.id()));
166 return Mono.just(ric.getProtocolVersion());
170 private Mono<A1ProtocolType> fetchVersion(Ric ric, A1ProtocolType protocolType) {
171 return createA1ClientMono(ric, protocolType) //
172 .flatMap(A1Client::getProtocolVersion);