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 AsyncRestClientFactory restClientFactory;
48 public A1ClientFactory(ApplicationConfig appConfig, SecurityContext securityContext) {
49 this.restClientFactory = new AsyncRestClientFactory(appConfig.getWebClientConfig(), securityContext);
53 * Creates an A1 client with the correct A1 protocol for the provided Ric.
56 * It detects the protocol version by trial and error, since there is no
57 * getVersion method specified in the A1 api yet.
60 * As a side effect it also sets the protocol version in the provided Ric. This
61 * means that after the first successful creation it won't have to try which
62 * protocol to use, but can create the client directly.
64 * @param ric The Near-RT RIC to get a client for.
65 * @return a client with the correct protocol, or a ServiceException if none of
66 * the protocols are supported by the Near-RT RIC.
68 public Mono<A1Client> createA1Client(Ric ric) {
69 return getProtocolVersion(ric) //
70 .flatMap(version -> createA1ClientMono(ric, version));
73 A1Client createClient(Ric ric, A1ProtocolType version) throws ServiceException {
74 if (version == A1ProtocolType.STD_V1_1) {
75 assertNoControllerConfig(ric, version);
76 return new StdA1ClientVersion1(ric.getConfig(), this.restClientFactory);
77 } else if (version == A1ProtocolType.STD_V2_0_0) {
78 assertNoControllerConfig(ric, version);
79 return new StdA1ClientVersion2(ric.getConfig(), this.restClientFactory);
80 } else if (version == A1ProtocolType.OSC_V1) {
81 assertNoControllerConfig(ric, version);
82 return new OscA1Client(ric.getConfig(), this.restClientFactory);
83 } else if (version == A1ProtocolType.CCSDK_A1_ADAPTER_STD_V1_1
84 || version == A1ProtocolType.CCSDK_A1_ADAPTER_OSC_V1
85 || version == A1ProtocolType.CCSDK_A1_ADAPTER_STD_V2_0_0) {
86 return new CcsdkA1AdapterClient(version, ric.getConfig(), this.restClientFactory);
87 } else if (version == A1ProtocolType.CUSTOM_PROTOCOL) {
88 return createCustomAdapter(ric);
90 logger.error("Unhandled protocol: {}", version);
91 throw new ServiceException("Unhandled protocol");
95 private ControllerConfig getControllerConfig(Ric ric) throws ServiceException {
96 ControllerConfig controllerConfig = ric.getConfig().getControllerConfig();
97 if (controllerConfig == null) {
98 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
99 throw new ServiceException("No controller configured for Near-RT RIC: " + ric.id());
101 return controllerConfig;
104 private A1Client createCustomAdapter(Ric ric) throws ServiceException {
106 if (ric.getConfig().getCustomAdapterClass() != null && !ric.getConfig().getCustomAdapterClass().isEmpty()) {
107 Class<?> clazz = Class.forName(ric.getConfig().getCustomAdapterClass());
108 if (A1Client.class.isAssignableFrom(clazz)) {
109 Constructor<?> constructor = clazz.getConstructor(RicConfig.class, AsyncRestClientFactory.class);
110 logger.debug("A1Client (" + clazz.getTypeName() + ") being created for ric: {}",
111 ric.getConfig().getRicId());
112 return (A1Client) constructor.newInstance(ric.getConfig(), this.restClientFactory);
113 } else if (A1Client.Factory.class.isAssignableFrom(clazz)) {
114 A1Client.Factory factory = (A1Client.Factory) clazz.getDeclaredConstructor().newInstance();
115 logger.debug("A1Client (" + clazz.getTypeName() + ") factory creating client for ric: {}",
116 ric.getConfig().getRicId());
117 return factory.create(ric.getConfig(), this.restClientFactory);
119 throw new ServiceException("The custom class must either implement A1Client.Factory or A1Client");
122 throw new ServiceException("Custom adapter class is required to use A1ProtocolType.CUSTOM_PROTOCOL");
124 } catch (ClassNotFoundException e) {
125 throw new ServiceException("Could not find class: " + ric.getConfig().getCustomAdapterClass(), e);
126 } catch (NoSuchMethodException e) {
127 throw new ServiceException("Could not find the required constructor in class "
128 + ric.getConfig().getCustomAdapterClass(), e);
129 } catch (ServiceException e) {
131 } catch (Exception e) {
132 throw new ServiceException("Cannot create custom adapter: " + ric.getConfig().getCustomAdapterClass(), e);
136 private void assertNoControllerConfig(Ric ric, A1ProtocolType version) throws ServiceException {
137 if (ric.getConfig().getControllerConfig() != null) {
138 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
139 throw new ServiceException(
140 "Controller config should be empty, ric: " + ric.id() + " when using protocol version: " + version);
144 private Mono<A1Client> createA1ClientMono(Ric ric, A1ProtocolType version) {
146 return Mono.just(createClient(ric, version));
147 } catch (ServiceException e) {
148 return Mono.error(e);
152 private Mono<A1Client.A1ProtocolType> getProtocolVersion(Ric ric) {
153 if (ric.getProtocolVersion() == A1ProtocolType.UNKNOWN) {
154 return fetchVersion(ric, A1ProtocolType.STD_V2_0_0) //
155 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.STD_V1_1)) //
156 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.OSC_V1)) //
157 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.CCSDK_A1_ADAPTER_STD_V1_1)) //
158 .doOnNext(ric::setProtocolVersion)
159 .doOnNext(version -> logger.debug("Established protocol version:{} for Near-RT RIC: {}", version,
161 .doOnError(notUsed -> logger.warn("Could not get protocol version from Near-RT RIC: {}", ric.id()));
163 return Mono.just(ric.getProtocolVersion());
167 private Mono<A1ProtocolType> fetchVersion(Ric ric, A1ProtocolType protocolType) {
168 return createA1ClientMono(ric, protocolType) //
169 .flatMap(A1Client::getProtocolVersion);