From: Kai Moritz <kai@juplo.de>
Date: Sat, 4 Sep 2021 10:23:57 +0000 (+0200)
Subject: query:1.0.1 - Rankings are enriched with user-data
X-Git-Tag: query-1.0.1
X-Git-Url: https://juplo.de/gitweb/?p=demos%2Fkafka%2Fwordcount;a=commitdiff_plain;h=101100b6dba432bb61952a1ddb2dac46d04f0750

query:1.0.1 - Rankings are enriched with user-data
---

diff --git a/pom.xml b/pom.xml
index d641d39..2dd080b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
 	</parent>
 	<groupId>de.juplo.kafka.wordcount</groupId>
 	<artifactId>query</artifactId>
-	<version>1.0.0</version>
+	<version>1.0.1</version>
 	<name>Wordcount-Query</name>
 	<description>Query stream-processor of the multi-user wordcount-example</description>
 	<properties>
diff --git a/src/main/java/de/juplo/kafka/wordcount/query/QueryController.java b/src/main/java/de/juplo/kafka/wordcount/query/QueryController.java
index 14006b6..0c7dc31 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryController.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryController.java
@@ -18,7 +18,7 @@ public class QueryController
   private final QueryStreamProcessor processor;
 
   @GetMapping("{username}")
-  ResponseEntity<Ranking> queryFor(@PathVariable String username)
+  ResponseEntity<UserRanking> queryFor(@PathVariable String username)
   {
     Optional<URI> redirect = processor.getRedirect(username);
     if (redirect.isPresent())
@@ -30,6 +30,6 @@ public class QueryController
               .build();
     }
 
-    return ResponseEntity.of(processor.getRanking(username));
+    return ResponseEntity.of(processor.getUserRanking(username));
   }
 }
diff --git a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
index 319861d..f7dc750 100644
--- a/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/query/QueryStreamProcessor.java
@@ -6,6 +6,8 @@ import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.*;
+import org.apache.kafka.streams.kstream.KStream;
+import org.apache.kafka.streams.kstream.KTable;
 import org.apache.kafka.streams.kstream.Materialized;
 import org.apache.kafka.streams.state.HostInfo;
 import org.apache.kafka.streams.state.QueryableStoreTypes;
@@ -42,7 +44,29 @@ public class QueryStreamProcessor
 	{
 		StreamsBuilder builder = new StreamsBuilder();
 
-		builder.table(properties.getRankingInputTopic(), Materialized.as(storeName));
+		KTable<String, String> users = builder.table(properties.getUsersInputTopic());
+		KStream<String, String> rankings = builder.stream(properties.getRankingInputTopic());
+
+		rankings
+				.join(users, (rankingJson, userJson) ->
+				{
+					try
+					{
+						Ranking ranking = mapper.readValue(rankingJson, Ranking.class);
+						User user = mapper.readValue(userJson, User.class);
+
+						return mapper.writeValueAsString(
+								UserRanking.of(
+										user.getFirstName(),
+										user.getLastName(),
+										ranking.getEntries()));
+					}
+					catch (JsonProcessingException e)
+					{
+						throw new RuntimeException(e);
+					}
+				})
+				.toTable(Materialized.as(storeName));
 
 		Properties props = new Properties();
 		props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
@@ -85,7 +109,7 @@ public class QueryStreamProcessor
 		return Optional.of(location);
 	}
 
-	public Optional<Ranking> getRanking(String username)
+	public Optional<UserRanking> getUserRanking(String username)
 	{
 		return
 				Optional
@@ -94,7 +118,7 @@ public class QueryStreamProcessor
 						{
 							try
 							{
-								return mapper.readValue(json, Ranking.class);
+								return mapper.readValue(json, UserRanking.class);
 							}
 							catch (JsonProcessingException e)
 							{
diff --git a/src/main/java/de/juplo/kafka/wordcount/query/User.java b/src/main/java/de/juplo/kafka/wordcount/query/User.java
new file mode 100644
index 0000000..fdc0a33
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/wordcount/query/User.java
@@ -0,0 +1,22 @@
+package de.juplo.kafka.wordcount.query;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+
+@Getter
+@Setter
+@ToString
+@EqualsAndHashCode(of = "username")
+public class User
+{
+  public enum Sex { FEMALE, MALE, OTHER }
+
+  private String username;
+
+  private String firstName;
+  private String lastName;
+  private Sex sex;
+}
diff --git a/src/main/java/de/juplo/kafka/wordcount/query/UserRanking.java b/src/main/java/de/juplo/kafka/wordcount/query/UserRanking.java
new file mode 100644
index 0000000..acffd5d
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/wordcount/query/UserRanking.java
@@ -0,0 +1,16 @@
+package de.juplo.kafka.wordcount.query;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+
+@Getter
+@Setter
+@AllArgsConstructor(staticName = "of")
+public class UserRanking
+{
+  private String firstName;
+  private String lastName;
+  private Entry[] top10;
+}