top10: 1.4.2 - RocksDB does nor work in Alpine-Linux

[demos/kafka/wordcount] / src / main / java / de / juplo / kafka / wordcount / top10 / Top10StreamProcessor.java

diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
index f0a7d19..1235132 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10StreamProcessor.java
@@ -1,11 +1,11 @@
 package de.juplo.kafka.wordcount.top10;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.streams.KafkaStreams;
-import org.apache.kafka.streams.KeyValue;
-import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.*;
+import org.apache.kafka.streams.kstream.Materialized;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.QueryableStoreTypes;
+import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
 
 import java.util.Properties;
 
@@ -13,55 +13,54 @@ import java.util.Properties;
 @Slf4j
 public class Top10StreamProcessor
 {
+       public static final String STORE_NAME= "top10";
+
        public final KafkaStreams streams;
 
 
        public Top10StreamProcessor(
                        String inputTopic,
                        String outputTopic,
-                       ObjectMapper mapper,
-                       Properties props)
+                       Properties props,
+                       KeyValueBytesStoreSupplier storeSupplier)
+       {
+               Topology topology = Top10StreamProcessor.buildTopology(
+                               inputTopic,
+                               outputTopic,
+                               storeSupplier);
+
+               streams = new KafkaStreams(topology, props);
+       }
+
+       static Topology buildTopology(
+                       String inputTopic,
+                       String outputTopic,
+                       KeyValueBytesStoreSupplier storeSupplier)
        {
                StreamsBuilder builder = new StreamsBuilder();
 
                builder
-                               .<String, String>stream(inputTopic)
-                               .map((keyJson, countStr) ->
-                               {
-                                       try
-                                       {
-                                               Key key = mapper.readValue(keyJson, Key.class);
-                                               Long count = Long.parseLong(countStr);
-                                               Entry entry = Entry.of(key.getWord(), count);
-                                               String entryJson = mapper.writeValueAsString(entry);
-                                               return new KeyValue<>(key.getUsername(), entryJson);
-                                       }
-                                       catch (JsonProcessingException e)
-                                       {
-                                               throw new RuntimeException(e);
-                                       }
-                               })
+                               .<Key, Entry>stream(inputTopic)
+                               .map((key, entry) -> new KeyValue<>(
+                                               Stats.of(key.getType(), key.getChannel()),
+                                               entry))
                                .groupByKey()
                                .aggregate(
-                                               () -> "{\"entries\"     : []}",
-                                               (username, entryJson, rankingJson) ->
-                                               {
-                                                       try
-                                                       {
-                                                               Ranking ranking = mapper.readValue(rankingJson, Ranking.class);
-                                                               ranking.add(mapper.readValue(entryJson, Entry.class));
-                                                               return mapper.writeValueAsString(ranking);
-                                                       }
-                                                       catch (JsonProcessingException e)
-                                                       {
-                                                               throw new RuntimeException(e);
-                                                       }
-                                               }
-                               )
+                                               () -> new Ranking(),
+                                               (stats, entry, ranking) -> ranking.add(entry),
+                                               Materialized.as(storeSupplier))
                                .toStream()
                                .to(outputTopic);
 
-               streams = new KafkaStreams(builder.build(), props);
+               Topology topology = builder.build();
+               log.info("\n\n{}", topology.describe());
+
+               return topology;
+       }
+
+       ReadOnlyKeyValueStore<Stats, Ranking> getStore()
+       {
+               return streams.store(StoreQueryParameters.fromNameAndType(STORE_NAME, QueryableStoreTypes.keyValueStore()));
        }
 
        public void start()