Make schema registry url configurable

uc4-application/src/main/java/uc4/application/HistoryService.java

 package uc4.application;
 
-import java.time.Duration;
 import java.util.Objects;
 import java.util.concurrent.CompletableFuture;
 import org.apache.commons.configuration2.Configuration;
@@ -18,8 +17,8 @@ public class HistoryService {
   private final Configuration config = Configurations.create();
 
   private final CompletableFuture<Void> stopEvent = new CompletableFuture<>();
-  final int KAFKA_WINDOW_DURATION_MINUTES = Integer
-      .parseInt(Objects.requireNonNullElse(System.getenv("KAFKA_WINDOW_DURATION_MINUTES"), "60"));
+
+  final String schemaRegistry = Objects.requireNonNull(System.getenv("SCHEMA_REGISTRY_URL"));
 
   /**
    * Start the service.
@@ -37,9 +36,9 @@ public class HistoryService {
   private void createKafkaStreamsApplication() {
     final KafkaStreams kafkaStreams = new KafkaStreamsBuilder()
         .bootstrapServers(this.config.getString(ConfigurationKeys.KAFKA_BOOTSTRAP_SERVERS))
+        .schemaRegistry(this.schemaRegistry)
         .inputTopic(this.config.getString(ConfigurationKeys.KAFKA_INPUT_TOPIC))
         .outputTopic(this.config.getString(ConfigurationKeys.KAFKA_OUTPUT_TOPIC))
-        .windowDuration(Duration.ofMinutes(this.KAFKA_WINDOW_DURATION_MINUTES))
         .numThreads(this.config.getInt(ConfigurationKeys.NUM_THREADS))
         .commitIntervalMs(this.config.getInt(ConfigurationKeys.COMMIT_INTERVAL_MS))
         .cacheMaxBytesBuffering(this.config.getInt(ConfigurationKeys.CACHE_MAX_BYTES_BUFFERING))

uc4-application/src/main/java/uc4/streamprocessing/KafkaStreamsBuilder.java

@@ -22,6 +22,7 @@ public class KafkaStreamsBuilder {
   private String inputTopic; // NOPMD
   private String outputTopic; // NOPMD
   private Duration windowDuration; // NOPMD
+  private String schemaRegistryUrl; // NOPMD
   private int numThreads = -1; // NOPMD
   private int commitIntervalMs = -1; // NOPMD
   private int cacheMaxBytesBuff = -1; // NOPMD
@@ -36,13 +37,13 @@ public class KafkaStreamsBuilder {
     return this;
   }
 
-  public KafkaStreamsBuilder outputTopic(final String outputTopic) {
-    this.outputTopic = outputTopic;
+  public KafkaStreamsBuilder schemaRegistry(final String url) {
+    this.schemaRegistryUrl = url;
     return this;
   }
 
-  public KafkaStreamsBuilder windowDuration(final Duration windowDuration) {
-    this.windowDuration = windowDuration;
+  public KafkaStreamsBuilder outputTopic(final String outputTopic) {
+    this.outputTopic = outputTopic;
     return this;
   }
 
@@ -91,7 +92,7 @@ public class KafkaStreamsBuilder {
     Objects.requireNonNull(this.inputTopic, "Input topic has not been set.");
     // TODO log parameters
     final TopologyBuilder topologyBuilder = new TopologyBuilder(this.inputTopic, this.outputTopic,
-        this.windowDuration, null);
+        this.windowDuration, this.schemaRegistryUrl);
     final Properties properties = PropertiesBuilder.bootstrapServers(this.bootstrapServers)
         .applicationId(APPLICATION_NAME + '-' + APPLICATION_VERSION) // TODO as parameter
         .set(StreamsConfig.NUM_STREAM_THREADS_CONFIG, this.numThreads, p -> p > 0)