policy-agent/src/main/java/org/oransc/policyagent/clients/A1ClientFactory.java

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * O-RAN-SC
   4  * %%
   5  * Copyright (C) 2019 Nordix Foundation
   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
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  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===================================
  19  */
  20
  21 package org.oransc.policyagent.clients;
  22
  23 import org.oransc.policyagent.clients.A1Client.A1ProtocolType;
  24 import org.oransc.policyagent.exceptions.ServiceException;
  25 import org.oransc.policyagent.repository.Ric;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28 import reactor.core.publisher.Mono;
  29
  30 public class A1ClientFactory {
  31
  32     private static final Logger logger = LoggerFactory.getLogger(A1ClientFactory.class);
  33
  34     public Mono<A1Client> createA1Client(Ric ric) {
  35         return getProtocolVersion(ric) //
  36             .flatMap(version -> createA1Client(ric, version));
  37     }
  38
  39     private Mono<A1Client> createA1Client(Ric ric, A1ProtocolType version) {
  40         if (version == A1ProtocolType.STD_V1) {
  41             return Mono.just(createStdA1ClientImpl(ric));
  42         } else if (version == A1ProtocolType.OSC_V1) {
  43             return Mono.just(new OscA1Client(ric.getConfig()));
  44         } else if (version == A1ProtocolType.SDNC_OSC) {
  45             return Mono.just(createSdncOscA1Client(ric));
  46         } else if (version == A1ProtocolType.SDNR_ONAP) {
  47             return Mono.just(createSdnrOnapA1Client(ric));
  48         }
  49         return Mono.error(new ServiceException("Not supported protocoltype: " + version));
  50     }
  51
  52     private Mono<A1Client.A1ProtocolType> getProtocolVersion(Ric ric) {
  53         if (ric.getProtocolVersion() == A1ProtocolType.UNKNOWN) {
  54             return fetchVersion(ric, createSdnrOnapA1Client(ric)) //
  55                 .onErrorResume(err -> fetchVersion(ric, createSdncOscA1Client(ric)))
  56                 .onErrorResume(err -> fetchVersion(ric, new OscA1Client(ric.getConfig())))
  57                 .onErrorResume(err -> fetchVersion(ric, createStdA1ClientImpl(ric)))
  58                 .doOnNext(version -> ric.setProtocolVersion(version))
  59                 .doOnNext(version -> logger.debug("Recover ric: {}, protocol version:{}", ric.name(), version)) //
  60                 .doOnError(t -> logger.warn("Could not get protocol version from RIC: {}", ric.name())); //
  61         } else {
  62             return Mono.just(ric.getProtocolVersion());
  63         }
  64     }
  65
  66     protected A1Client createStdA1ClientImpl(Ric ric) {
  67         return new StdA1Client(ric.getConfig());
  68     }
  69
  70     protected A1Client createSdncOscA1Client(Ric ric) {
  71         return new SdncOscA1Client(ric.getConfig());
  72     }
  73
  74     protected A1Client createSdnrOnapA1Client(Ric ric) {
  75         return new SdnrOnapA1Client(ric.getConfig());
  76     }
  77
  78     private Mono<A1Client.A1ProtocolType> fetchVersion(Ric ric, A1Client a1Client) {
  79         return Mono.just(a1Client) //
  80             .flatMap(client -> a1Client.getProtocolVersion());
  81     }
  82
  83 }