utils/DmaapPublisher/src/main/java/org/openecomp/sdc/dmaap/DmaapPublishTool.java

   1 package org.openecomp.sdc.dmaap;
   2
   3 import com.att.nsa.mr.client.MRBatchingPublisher;
   4 import com.att.nsa.mr.client.MRClientFactory;
   5 import com.att.nsa.mr.client.MRPublisher.message;
   6 import org.apache.commons.lang3.StringUtils;
   7 import org.slf4j.Logger;
   8 import org.slf4j.LoggerFactory;
   9 import org.yaml.snakeyaml.Yaml;
  10
  11 import java.util.concurrent.TimeUnit;
  12
  13 public class DmaapPublishTool {
  14
  15     private static final Logger logger = LoggerFactory.getLogger(DmaapPublishTool.class);
  16     final private TopicConfig topicConfig;
  17
  18     public DmaapPublishTool(String yamlPath) throws FileNotFoundException {
  19         topicConfig = loadTopicConfig(yamlPath);
  20         System.out.println("yaml file loaded.");
  21     }
  22     public DmaapPublishTool(String yamlPath , String notifications) throws FileNotFoundException {
  23         topicConfig = loadTopicConfig(yamlPath);
  24         if (StringUtils.isNotBlank(notifications) )
  25             topicConfig.add( notifications );
  26         System.out.println("yaml file loaded.");
  27     }
  28
  29     public void addNotifications(Collection<String> notification){
  30         topicConfig.addAll( notification );
  31     }
  32
  33     //safe stream doesn't throw null pointer exception
  34     public <T> Collection<T> safe(Collection<T> obj){
  35         return Optional.ofNullable(obj).orElse(Collections.emptySet());
  36     }
  37     public <T> List<T> safe(List<T> obj){
  38         return Optional.ofNullable(obj).orElse(Collections.emptyList());
  39     }
  40
  41     public void publish(String path) throws IOException, InterruptedException {
  42         MRBatchingPublisher pub = createPublisher( topicConfig, path );
  43         System.out.println( "pending message count -> "+pub.getPendingMessageCount() );
  44         List<String> list = this.topicConfig.getIncomingTopicMessages();
  45         for(String msg : safe(list) ){
  46                 publishOne( pub , msg );
  47         }
  48         closePublisher(pub);
  49     }
  50
  51     private MRBatchingPublisher createPublisher(TopicConfig topicConfig,String path) throws IOException {
  52         MRBatchingPublisher publisher = MRClientFactory.createBatchingPublisher(Objects.requireNonNull(Util.toPath(path,topicConfig.getPublisherPropertiesFilePath())));
  53         System.out.println("publisher created.");
  54         return publisher;
  55     }
  56
  57     private TopicConfig loadTopicConfig(String yamlPath) throws FileNotFoundException {
  58         File yamlFile = new File(Objects.requireNonNull(yamlPath));
  59         InputStream input = new FileInputStream(yamlFile);
  60         Yaml yamlHelper = new Yaml();
  61         return yamlHelper.loadAs(input, TopicConfig.class);
  62     }
  63
  64     private void publishOne(MRBatchingPublisher pub, String msg) throws IOException, InterruptedException {
  65         System.out.println("sending:    " + msg);
  66         pub.send(msg);
  67         System.out.println("message sent.");
  68     }
  69
  70     private void closePublisher(MRBatchingPublisher pub) throws IOException, InterruptedException {
  71         System.out.println("closing publisher...");
  72         // close the publisher to make sure everything's sent before exiting. The batching
  73         // publisher interface allows the app to get the set of unsent messages. It could
  74         // write them to disk, for example, to try to send them later.
  75         final List<message> stuck = pub.close(20, TimeUnit.SECONDS);
  76         if(!stuck.isEmpty())
  77         {
  78             final String errMsg = stuck.size() + " messages unsent";
  79             logger.error(errMsg);
  80             System.err.println(errMsg);
  81         }
  82         else
  83         {
  84             final String successMsg = "Clean exit; all messages sent.";
  85             logger.info(successMsg);
  86             System.out.println(successMsg);
  87         }
  88     }
  89 }