Springify: Can send multiple types of messages

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

diff --git a/src/main/java/de/juplo/kafka/RestProducer.java b/src/main/java/de/juplo/kafka/RestProducer.java
index 19f70ba..6c852ce 100644 (file)
--- a/src/main/java/de/juplo/kafka/RestProducer.java
+++ b/src/main/java/de/juplo/kafka/RestProducer.java
@@ -4,14 +4,14 @@ import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.producer.KafkaProducer;
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.apache.kafka.common.serialization.StringSerializer;
-import org.springframework.http.MediaType;
+import org.springframework.http.HttpStatus;
+import org.springframework.kafka.support.serializer.JsonSerializer;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.context.request.async.DeferredResult;
 
 import javax.annotation.PreDestroy;
 import java.util.Properties;
 import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
 
 
 @Slf4j
@@ -20,7 +20,7 @@ public class RestProducer
 {
   private final String id;
   private final String topic;
-  private final KafkaProducer<String, String> producer;
+  private final KafkaProducer<String, Object> producer;
 
   private long produced = 0;
 
@@ -34,29 +34,52 @@ public class RestProducer
     props.put("client.id", properties.getClientId());
     props.put("acks", properties.getAcks());
     props.put("batch.size", properties.getBatchSize());
+    props.put("delivery.timeout.ms", 20000); // 20 Sekunden
+    props.put("request.timeout.ms",  10000); // 10 Sekunden
     props.put("linger.ms", properties.getLingerMs());
     props.put("compression.type", properties.getCompressionType());
     props.put("key.serializer", StringSerializer.class.getName());
-    props.put("value.serializer", StringSerializer.class.getName());
+    props.put("value.serializer", JsonSerializer.class.getName());
+    props.put(JsonSerializer.TYPE_MAPPINGS,
+        "message:" + ClientMessage.class.getName() + "," +
+        "greeting:" + Greeting.class.getName());
 
     this.producer = new KafkaProducer<>(props);
   }
 
   @PostMapping(path = "{key}")
-  public DeferredResult<ProduceResult> send(
+  public DeferredResult<ProduceResult> message(
       @PathVariable String key,
       @RequestBody String value)
   {
-    DeferredResult<ProduceResult> result = new DeferredResult<>();
+    final ProducerRecord<String, Object> record = new ProducerRecord<>(
+        topic,  // Topic
+        key,    // Key
+        new ClientMessage(key, value) // Value
+    );
 
-    final long time = System.currentTimeMillis();
+    return send(record);
+  }
 
-    final ProducerRecord<String, String> record = new ProducerRecord<>(
+  @PostMapping(path = "/")
+  public DeferredResult<ProduceResult> greeting(
+      @RequestBody String name)
+  {
+    final ProducerRecord<String, Object> record = new ProducerRecord<>(
         topic,  // Topic
-        key,    // Key
-        value   // Value
+        name,    // Key
+        new Greeting(name) // Value
     );
 
+    return send(record);
+  }
+
+  private DeferredResult<ProduceResult> send(ProducerRecord<String, Object> record)
+  {
+    DeferredResult<ProduceResult> result = new DeferredResult<>();
+
+    final long time = System.currentTimeMillis();
+
     producer.send(record, (metadata, e) ->
     {
       long now = System.currentTimeMillis();
@@ -93,9 +116,8 @@ public class RestProducer
 
     long now = System.currentTimeMillis();
     log.trace(
-        "{} - Queued #{} key={} latency={}ms",
+        "{} - Queued key={} latency={}ms",
         id,
-        value,
         record.key(),
         now - time
     );
@@ -103,6 +125,13 @@ public class RestProducer
     return result;
   }
 
+  @ExceptionHandler
+  @ResponseStatus(HttpStatus.BAD_REQUEST)
+  public ErrorResponse illegalStateException(IllegalStateException e)
+  {
+    return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
+  }
+
   @PreDestroy
   public void destroy() throws ExecutionException, InterruptedException
   {