X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Fkafka%2FKafkaChatHomeService.java;h=22cd74b75ac4c879fbbd0a0182491a3e87414655;hb=915ed8f85459da3c95f86b6351a3d7129668bc8e;hp=f105902ca2a5a651019c685dd63adde015aba71e;hpb=3dcdfa896eaecf9802fdc2af4e2bd4951b0f5f6a;p=demos%2Fkafka%2Fchat diff --git a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java index f105902c..22cd74b7 100644 --- a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java +++ b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java @@ -13,25 +13,28 @@ import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.producer.Producer; import org.apache.kafka.clients.producer.ProducerRecord; import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.errors.RecordDeserializationException; +import org.apache.kafka.common.errors.WakeupException; import reactor.core.publisher.Flux; import reactor.core.publisher.Mono; import java.time.*; import java.util.*; -import java.util.concurrent.ExecutorService; +import java.util.stream.IntStream; @Slf4j public class KafkaChatHomeService implements ChatHomeService, Runnable, ConsumerRebalanceListener { - private final ExecutorService executorService; private final Consumer consumer; private final Producer producer; private final String topic; private final ZoneId zoneId; - // private final long[] offsets; Erst mal immer alles neu einlesen + private final int numShards; private final boolean[] isShardOwned; - private final Map[] chatRoomMaps; + private final long[] currentOffset; + private final long[] nextOffset; + private final Map[] chatrooms; private final KafkaLikeShardingStrategy shardingStrategy; private boolean running; @@ -39,7 +42,6 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer public KafkaChatHomeService( - ExecutorService executorService, Consumer consumer, Producer producer, String topic, @@ -47,18 +49,15 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer int numShards) { log.debug("Creating KafkaChatHomeService"); - this.executorService = executorService; this.consumer = consumer; this.producer = producer; this.topic = topic; this.zoneId = zoneId; - // this.offsets = new long[numShards]; - // for (int i=0; i< numShards; i++) - // { - // this.offsets[i] = 0l; - // } + this.numShards = numShards; this.isShardOwned = new boolean[numShards]; - this.chatRoomMaps = new Map[numShards]; + this.currentOffset = new long[numShards]; + this.nextOffset = new long[numShards]; + this.chatrooms = new Map[numShards]; this.shardingStrategy = new KafkaLikeShardingStrategy(numShards); } @@ -66,27 +65,22 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer @Override public void onPartitionsAssigned(Collection partitions) { + log.info("Newly assigned partitions! Pausing normal operations..."); loadInProgress = true; consumer.endOffsets(partitions).forEach((topicPartition, currentOffset) -> { - if (!topicPartition.topic().equals(topic)) - { - log.warn("Ignoring partition from unwanted topic: {}", topicPartition); - return; - } - int partition = topicPartition.partition(); - long unseenOffset = 0; // offsets[partition]; + isShardOwned[partition] = true; + this.currentOffset[partition] = currentOffset; log.info( - "Loading messages from partition {}: start-offset={} -> current-offset={}", + "Partition assigned: {} - loading messages: next={} -> current={}", partition, - unseenOffset, + nextOffset[partition], currentOffset); - // TODO: reuse! Nicht immer alles neu laden, sondern erst ab offsets[partition]! - consumer.seek(topicPartition, unseenOffset); + consumer.seek(topicPartition, nextOffset[partition]); }); consumer.resume(partitions); @@ -97,21 +91,16 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer { partitions.forEach(topicPartition -> { - if (!topicPartition.topic().equals(topic)) - { - log.warn("Ignoring partition from unwanted topic: {}", topicPartition); - return; - } - int partition = topicPartition.partition(); - // long unseenOffset = offsets[partition]; TODO: Offset merken...? + isShardOwned[partition] = false; + log.info("Partition revoked: {} - next={}", partition, nextOffset[partition]); }); - log.info("Revoked partitions: {}", partitions); } @Override public void onPartitionsLost(Collection partitions) { + log.warn("Lost partitions: {}, partitions"); // TODO: Muss auf den Verlust anders reagiert werden? onPartitionsRevoked(partitions); } @@ -123,40 +112,86 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer running = true; - try + while (running) { - while (running) + try { ConsumerRecords records = consumer.poll(Duration.ofMinutes(5)); log.info("Fetched {} messages", records.count()); if (loadInProgress) { - for (ConsumerRecord record : records) + loadMessages(records); + + if (isLoadingCompleted()) { - UUID chatRoomId = UUID.fromString(record.key()); - MessageTo messageTo = record.value(); - ChatRoom chatRoom = chatRoomMaps[record.partition()].get(chatRoomId); - KafkaChatRoomService kafkaChatRoomService = - (KafkaChatRoomService) chatRoom.getChatRoomService(); - Message.MessageKey key = Message.MessageKey.of(messageTo.getUser(), messageTo.getId()); - Instant instant = Instant.ofEpochSecond(record.timestamp()); - LocalDateTime timestamp = LocalDateTime.ofInstant(instant, zoneId); - Message message = new Message(key, record.offset(), timestamp, messageTo.getText()); - kafkaChatRoomService.persistMessage(message); + log.info("Loading of messages completed! Pausing all owned partitions..."); + pauseAllOwnedPartions(); + log.info("Resuming normal operations..."); + loadInProgress = false; } } else { if (!records.isEmpty()) { - throw new IllegalStateException("All owned partions should be paused, when no load is in progress!"); + throw new IllegalStateException("All owned partitions should be paused, when no load is in progress!"); } } } + catch (WakeupException e) + { + } + catch (RecordDeserializationException e) + { + } + } + } + + void loadMessages(ConsumerRecords records) + { + for (ConsumerRecord record : records) + { + nextOffset[record.partition()] = record.offset() + 1; + UUID chatRoomId = UUID.fromString(record.key()); + MessageTo messageTo = record.value(); + + Message.MessageKey key = Message.MessageKey.of(messageTo.getUser(), messageTo.getId()); + + Instant instant = Instant.ofEpochSecond(record.timestamp()); + LocalDateTime timestamp = LocalDateTime.ofInstant(instant, zoneId); + + Message message = new Message(key, record.offset(), timestamp, messageTo.getText()); + + ChatRoom chatRoom = chatrooms[record.partition()].get(chatRoomId); + KafkaChatRoomService kafkaChatRoomService = + (KafkaChatRoomService) chatRoom.getChatRoomService(); + + kafkaChatRoomService.persistMessage(message); } } + boolean isLoadingCompleted() + { + return IntStream + .range(0, numShards) + .filter(shard -> isShardOwned[shard]) + .mapToObj(shard -> nextOffset[shard] >= currentOffset[shard]) + .collect( + () -> Boolean.TRUE, + (acc, v) -> Boolean.valueOf(acc && v), + (a, b) -> Boolean.valueOf(a && b)); + } + + void pauseAllOwnedPartions() + { + consumer.pause(IntStream + .range(0, numShards) + .filter(shard -> isShardOwned[shard]) + .mapToObj(shard -> new TopicPartition(topic, shard)) + .toList()); + } + Mono sendMessage( UUID chatRoomId, Message.MessageKey key, @@ -202,6 +237,12 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer } + public void putChatRoom(ChatRoom chatRoom) + { + // TODO: Nachricht senden! + chatrooms[chatRoom.getShard()].put(chatRoom.getId(), chatRoom); + } + @Override public Mono getChatRoom(int shard, UUID id) { @@ -211,7 +252,7 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer } else { - return Mono.justOrEmpty(chatRoomMaps[shard].get(id)); + return Mono.justOrEmpty(chatrooms[shard].get(id)); } } @@ -224,7 +265,7 @@ public class KafkaChatHomeService implements ChatHomeService, Runnable, Consumer } else { - return Flux.fromStream(chatRoomMaps[shard].values().stream()); + return Flux.fromStream(chatrooms[shard].values().stream()); } } }