policy-agent/src/main/java/org/oransc/policyagent/configuration/ApplicationConfigLoader.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.configuration;
  22
  23 import io.swagger.annotations.ApiOperation;
  24
  25 import java.time.Duration;
  26 import java.util.ArrayList;
  27 import java.util.List;
  28 import java.util.concurrent.ScheduledFuture;
  29
  30 import javax.annotation.PostConstruct;
  31
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.springframework.beans.factory.annotation.Autowired;
  35 import org.springframework.http.HttpStatus;
  36 import org.springframework.http.ResponseEntity;
  37 import org.springframework.scheduling.TaskScheduler;
  38 import org.springframework.scheduling.annotation.EnableScheduling;
  39 import org.springframework.stereotype.Component;
  40 import reactor.core.publisher.Mono;
  41
  42 @Component
  43 @EnableScheduling
  44 class ApplicationConfigLoader {
  45
  46     private static final Logger logger = LoggerFactory.getLogger(ApplicationConfigLoader.class);
  47     private static List<ScheduledFuture<?>> scheduledFutureList = new ArrayList<>();
  48     private static final Duration CONFIGURATION_REFRESH_INTERVAL = Duration.ofSeconds(15);
  49
  50     private final TaskScheduler taskScheduler;
  51     private final ApplicationConfig configuration;
  52
  53     @Autowired
  54     public ApplicationConfigLoader(TaskScheduler taskScheduler, ApplicationConfig configuration) {
  55         this.taskScheduler = taskScheduler;
  56         this.configuration = configuration;
  57     }
  58
  59     /**
  60      * Function which have to stop tasks execution.
  61      *
  62      * @return response entity about status of cancellation operation
  63      */
  64     @ApiOperation(value = "Get response on stopping task execution")
  65     public synchronized Mono<ResponseEntity<String>> getResponseFromCancellationOfTasks() {
  66         scheduledFutureList.forEach(x -> x.cancel(false));
  67         scheduledFutureList.clear();
  68         logger.info("Stopped");
  69         return Mono.just(new ResponseEntity<>("Service has already been stopped!", HttpStatus.CREATED));
  70     }
  71
  72     @PostConstruct
  73     @ApiOperation(value = "Start task if possible")
  74     public synchronized boolean start() {
  75         logger.info("Start scheduling Datafile workflow");
  76         configuration.initialize();
  77
  78         if (scheduledFutureList.isEmpty()) {
  79             scheduledFutureList
  80                 .add(taskScheduler.scheduleWithFixedDelay(this::refreshConfiguration, CONFIGURATION_REFRESH_INTERVAL));
  81             return true;
  82         } else {
  83             return false;
  84         }
  85     }
  86
  87     private void refreshConfiguration() {
  88         // TBD
  89
  90     }
  91
  92 }