2 * ========================LICENSE_START=================================
4 * ======================================================================
5 * Copyright (C) 2020 Nordix Foundation. All rights reserved.
6 * ======================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ========================LICENSE_END===================================
21 package org.onap.ccsdk.oran.a1policymanagementservice.clients;
23 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1Client.A1ProtocolType;
24 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
25 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ControllerConfig;
26 import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
27 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
28 import org.slf4j.Logger;
29 import org.slf4j.LoggerFactory;
30 import org.springframework.beans.factory.annotation.Autowired;
31 import reactor.core.publisher.Mono;
34 * Factory for A1 clients that supports four different protocol versions of the
37 public class A1ClientFactory {
39 private static final Logger logger = LoggerFactory.getLogger(A1ClientFactory.class);
41 private final ApplicationConfig appConfig;
43 private final AsyncRestClientFactory restClientFactory;
46 public A1ClientFactory(ApplicationConfig appConfig) {
47 this.appConfig = appConfig;
48 this.restClientFactory = new AsyncRestClientFactory(appConfig.getWebClientConfig());
52 * Creates an A1 client with the correct A1 protocol for the provided Ric.
55 * It detects the protocol version by trial and error, since there is no
56 * getVersion method specified in the A1 api yet.
59 * As a side effect it also sets the protocol version in the provided Ric. This
60 * means that after the first successful creation it won't have to try which
61 * protocol to use, but can create the client directly.
63 * @param ric The Near-RT RIC to get a client for.
64 * @return a client with the correct protocol, or a ServiceException if none of
65 * the protocols are supported by the Near-RT RIC.
67 public Mono<A1Client> createA1Client(Ric ric) {
68 return getProtocolVersion(ric) //
69 .flatMap(version -> createA1ClientMono(ric, version));
72 A1Client createClient(Ric ric, A1ProtocolType version) throws ServiceException {
73 if (version == A1ProtocolType.STD_V1_1) {
74 assertNoControllerConfig(ric, version);
75 return new StdA1ClientVersion1(ric.getConfig(), this.restClientFactory);
76 } else if (version == A1ProtocolType.STD_V2_0_0) {
77 assertNoControllerConfig(ric, version);
78 return new StdA1ClientVersion2(ric.getConfig(), this.restClientFactory);
79 } else if (version == A1ProtocolType.OSC_V1) {
80 assertNoControllerConfig(ric, version);
81 return new OscA1Client(ric.getConfig(), this.restClientFactory);
82 } else if (version == A1ProtocolType.SDNC_OSC_STD_V1_1 || version == A1ProtocolType.SDNC_OSC_OSC_V1
83 || version == A1ProtocolType.SDNC_OSC_STD_V2_0_0) {
84 return new SdncOscA1Client(version, ric.getConfig(), getControllerConfig(ric), this.restClientFactory);
85 } else if (version == A1ProtocolType.SDNC_ONAP) {
86 return new SdncOnapA1Client(ric.getConfig(), getControllerConfig(ric), this.restClientFactory);
88 logger.error("Unhandled protocol: {}", version);
89 throw new ServiceException("Unhandled protocol");
93 private ControllerConfig getControllerConfig(Ric ric) throws ServiceException {
94 String controllerName = ric.getConfig().controllerName();
95 if (controllerName.isEmpty()) {
96 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
97 throw new ServiceException("No controller configured for Near-RT RIC: " + ric.id());
100 return this.appConfig.getControllerConfig(controllerName);
101 } catch (ServiceException e) {
102 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
107 private void assertNoControllerConfig(Ric ric, A1ProtocolType version) throws ServiceException {
108 if (!ric.getConfig().controllerName().isEmpty()) {
109 ric.setProtocolVersion(A1ProtocolType.UNKNOWN);
110 throw new ServiceException(
111 "Controller config should be empty, ric: " + ric.id() + " when using protocol version: " + version);
115 private Mono<A1Client> createA1ClientMono(Ric ric, A1ProtocolType version) {
117 return Mono.just(createClient(ric, version));
118 } catch (ServiceException e) {
119 return Mono.error(e);
123 private Mono<A1Client.A1ProtocolType> getProtocolVersion(Ric ric) {
124 if (ric.getProtocolVersion() == A1ProtocolType.UNKNOWN) {
125 return fetchVersion(ric, A1ProtocolType.STD_V2_0_0) //
126 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.STD_V1_1)) //
127 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.OSC_V1)) //
128 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.SDNC_OSC_STD_V1_1)) //
129 .onErrorResume(notUsed -> fetchVersion(ric, A1ProtocolType.SDNC_ONAP)) //
130 .doOnNext(ric::setProtocolVersion)
131 .doOnNext(version -> logger.debug("Established protocol version:{} for Near-RT RIC: {}", version,
133 .doOnError(notUsed -> logger.warn("Could not get protocol version from Near-RT RIC: {}", ric.id())) //
135 notUsed -> Mono.error(new ServiceException("Protocol negotiation failed for " + ric.id())));
137 return Mono.just(ric.getProtocolVersion());
141 private Mono<A1ProtocolType> fetchVersion(Ric ric, A1ProtocolType protocolType) {
142 return createA1ClientMono(ric, protocolType) //
143 .flatMap(A1Client::getProtocolVersion);