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

   1 package org.openecomp.sdc.dmaap;
   2
   3 import java.io.File;
   4 import java.io.FileInputStream;
   5 import java.io.FileNotFoundException;
   6 import java.io.IOException;
   7 import java.io.InputStream;
   8 import java.util.*;
   9 import java.util.concurrent.TimeUnit;
  10 import java.util.stream.Stream;
  11
  12 import org.apache.commons.lang3.StringUtils;
  13 import org.slf4j.Logger;
  14 import org.slf4j.LoggerFactory;
  15 import org.yaml.snakeyaml.Yaml;
  16
  17 import com.att.nsa.mr.client.MRBatchingPublisher;
  18 import com.att.nsa.mr.client.MRClientFactory;
  19 import com.att.nsa.mr.client.MRPublisher.message;
  20
  21 public class DmaapPublishTool {
  22
  23     private static final Logger logger = LoggerFactory.getLogger(DmaapPublishTool.class);
  24     final private TopicConfig topicConfig;
  25
  26     public DmaapPublishTool(String yamlPath) throws FileNotFoundException {
  27         topicConfig = loadTopicConfig(yamlPath);
  28         System.out.println("yaml file loaded.");
  29     }
  30     public DmaapPublishTool(String yamlPath , String notifications) throws FileNotFoundException {
  31         topicConfig = loadTopicConfig(yamlPath);
  32         if (StringUtils.isNotBlank(notifications) )
  33             topicConfig.add( notifications );
  34         System.out.println("yaml file loaded.");
  35     }
  36
  37     public void addNotifications(Collection<String> notification){
  38         topicConfig.addAll( notification );
  39     }
  40
  41     //safe stream doesn't throw null pointer exception
  42     public <T> Collection<T> safe(Collection<T> obj){
  43         return Optional.ofNullable(obj).orElse(Collections.emptySet());
  44     }
  45     public <T> List<T> safe(List<T> obj){
  46         return Optional.ofNullable(obj).orElse(Collections.emptyList());
  47     }
  48
  49     public void publish(String path) throws IOException, InterruptedException {
  50         MRBatchingPublisher pub = createPublisher( topicConfig, path );
  51         System.out.println( "pending message count -> "+pub.getPendingMessageCount() );
  52         List<String> list = this.topicConfig.getIncomingTopicMessages();
  53         for(String msg : safe(list) ){
  54                 publishOne( pub , msg );
  55         }
  56         closePublisher(pub);
  57     }
  58
  59     private MRBatchingPublisher createPublisher(TopicConfig topicConfig,String path) throws IOException {
  60         MRBatchingPublisher publisher = MRClientFactory.createBatchingPublisher(Objects.requireNonNull(Util.toPath(path,topicConfig.getPublisherPropertiesFilePath())));
  61         System.out.println("publisher created.");
  62         return publisher;
  63     }
  64
  65     private TopicConfig loadTopicConfig(String yamlPath) throws FileNotFoundException {
  66         File yamlFile = new File(Objects.requireNonNull(yamlPath));
  67         InputStream input = new FileInputStream(yamlFile);
  68         Yaml yamlHelper = new Yaml();
  69         return yamlHelper.loadAs(input, TopicConfig.class);
  70     }
  71
  72     private void publishOne(MRBatchingPublisher pub, String msg) throws IOException, InterruptedException {
  73         System.out.println("sending:    " + msg);
  74         pub.send(msg);
  75         System.out.println("message sent.");
  76     }
  77
  78     private void closePublisher(MRBatchingPublisher pub) throws IOException, InterruptedException {
  79         System.out.println("closing publisher...");
  80         // close the publisher to make sure everything's sent before exiting. The batching
  81         // publisher interface allows the app to get the set of unsent messages. It could
  82         // write them to disk, for example, to try to send them later.
  83         final List<message> stuck = pub.close(20, TimeUnit.SECONDS);
  84         if(!stuck.isEmpty())
  85         {
  86             final String errMsg = stuck.size() + " messages unsent";
  87             logger.error(errMsg);
  88             System.err.println(errMsg);
  89         }
  90         else
  91         {
  92             final String successMsg = "Clean exit; all messages sent.";
  93             logger.info(successMsg);
  94             System.out.println(successMsg);
  95         }
  96     }
  97 }