Möglichst einfach gehaltener technisch vollständiger Producer

[demos/kafka/training] / src / main / java / de / juplo / kafka / SimpleProducer.java

diff --git a/src/main/java/de/juplo/kafka/SimpleProducer.java b/src/main/java/de/juplo/kafka/SimpleProducer.java
index 43a7227..fd03d73 100644 (file)
--- a/src/main/java/de/juplo/kafka/SimpleProducer.java
+++ b/src/main/java/de/juplo/kafka/SimpleProducer.java
@@ -6,8 +6,6 @@ import org.apache.kafka.clients.producer.ProducerRecord;
 import org.apache.kafka.common.serialization.StringSerializer;
 
 import java.util.Properties;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
 
 
 @Slf4j
@@ -18,21 +16,21 @@ public class SimpleProducer
   private final KafkaProducer<String, String> producer;
 
   private long produced = 0;
+  private volatile boolean running = true;
+  private volatile boolean done = false;
 
-  public SimpleProducer(String clientId, String topic)
+  public SimpleProducer(String broker, String topic, String id)
   {
-    // tag::create[]
     Properties props = new Properties();
-    props.put("bootstrap.servers", "localhost:9092");
+    props.put("bootstrap.servers", broker);
+    props.put("client.id", id); // Nur zur Wiedererkennung
     props.put("key.serializer", StringSerializer.class.getName());
     props.put("value.serializer", StringSerializer.class.getName());
 
-    KafkaProducer<String, String> producer = new KafkaProducer<>(props);
-    // end::create[]
+    producer = new KafkaProducer<>(props);
 
-    this.id = clientId;
     this.topic = topic;
-    this.producer = producer;
+    this.id = id;
   }
 
   public void run()
@@ -41,18 +39,19 @@ public class SimpleProducer
 
     try
     {
-      for (; i < 100 ; i++)
+      for (; running ; i++)
       {
         send(Long.toString(i%10), Long.toString(i));
+        Thread.sleep(500);
       }
-
-      log.info("{} - Done", id);
     }
+    catch (InterruptedException e) {}
     finally
     {
       log.info("{}: Closing the KafkaProducer", id);
       producer.close();
       log.info("{}: Produced {} messages in total, exiting!", id, produced);
+      done = true;
     }
   }
 
@@ -111,7 +110,42 @@ public class SimpleProducer
 
   public static void main(String[] args) throws Exception
   {
-    SimpleProducer producer = new SimpleProducer("P", "test");
+    String broker = ":9092";
+    String topic = "test";
+    String clientId = "DEV";
+
+    switch (args.length)
+    {
+      case 3:
+        clientId = args[2];
+      case 2:
+        topic = args[1];
+      case 1:
+        broker = args[0];
+    }
+
+    SimpleProducer producer = new SimpleProducer(broker, topic, clientId);
+
+    Runtime.getRuntime().addShutdownHook(new Thread(() ->
+    {
+      producer.running = false;
+      while (!producer.done)
+      {
+        log.info("Waiting for producer...");
+        try
+        {
+          Thread.sleep(1000);
+        }
+        catch (InterruptedException e) {}
+      }
+      log.info("Shutdown completed.");
+    }));
+
+    log.info(
+        "Running simple producer: broker={}, topic={}, client-id={}",
+        broker,
+        topic,
+        clientId);
     producer.run();
   }
 }