X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fimplementation%2Fkafka%2FInfoChannel.java;h=95f7fb064b1271459102f79cd9f84dd9a245b61e;hb=8300dcd98f681893a077051560151a8f1b94e38d;hp=3429d405245652e81ba5ab4e6fa03b7d31882c57;hpb=b57c6c7d41ba5bd3ff095450798010aa45751462;p=demos%2Fkafka%2Fchat

diff --git a/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/InfoChannel.java b/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/InfoChannel.java
index 3429d405..95f7fb06 100644
--- a/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/InfoChannel.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/InfoChannel.java
@@ -5,46 +5,55 @@ import de.juplo.kafka.chat.backend.implementation.kafka.messages.AbstractMessage
 import de.juplo.kafka.chat.backend.implementation.kafka.messages.info.EventChatRoomCreated;
 import de.juplo.kafka.chat.backend.implementation.kafka.messages.info.EventShardAssigned;
 import de.juplo.kafka.chat.backend.implementation.kafka.messages.info.EventShardRevoked;
+import lombok.Getter;
+import lombok.ToString;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.consumer.Consumer;
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 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.clients.producer.RecordMetadata;
 import org.apache.kafka.common.errors.WakeupException;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
 import java.net.URI;
-import java.time.*;
+import java.time.Duration;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.UUID;
 import java.util.stream.IntStream;
 
 
+@ToString(of = { "topic", "instanceUri" })
 @Slf4j
-public class InfoChannel implements Runnable
+public class InfoChannel implements Channel
 {
   private final String topic;
   private final Producer<String, AbstractMessageTo> producer;
   private final Consumer<String, AbstractMessageTo> consumer;
+  private final Duration pollingInterval;
   private final int numShards;
   private final String[] shardOwners;
   private final long[] currentOffset;
   private final long[] nextOffset;
   private final Map<UUID, ChatRoomInfo> chatRoomInfo;
   private final String instanceUri;
+  private final ChannelMediator channelMediator;
 
   private boolean running;
+  @Getter
+  private volatile ChannelState channelState = ChannelState.STARTING;
 
 
   public InfoChannel(
     String topic,
     Producer<String, AbstractMessageTo> producer,
     Consumer<String, AbstractMessageTo> infoChannelConsumer,
-    URI instanceUri)
+    Duration pollingInterval,
+    int numShards,
+    URI instanceUri,
+    ChannelMediator channelMediator)
   {
     log.debug(
         "Creating InfoChannel for topic {}",
@@ -54,9 +63,9 @@ public class InfoChannel implements Runnable
     this.producer = producer;
     this.chatRoomInfo = new HashMap<>();
 
-    this.numShards = consumer
-        .partitionsFor(topic)
-        .size();
+    this.pollingInterval = pollingInterval;
+
+    this.numShards = numShards;
     this.shardOwners = new String[numShards];
     this.currentOffset = new long[numShards];
     this.nextOffset = new long[numShards];
@@ -65,16 +74,11 @@ public class InfoChannel implements Runnable
         .forEach(partition -> this.nextOffset[partition] = -1l);
 
     this.instanceUri = instanceUri.toASCIIString();
-  }
 
-
-  boolean isLoadInProgress()
-  {
-    return IntStream
-        .range(0, numShards)
-        .anyMatch(partition -> nextOffset[partition] < currentOffset[partition]);
+    this.channelMediator = channelMediator;
   }
 
+
   Mono<ChatRoomInfo> sendChatRoomCreatedEvent(
       UUID chatRoomId,
       String name,
@@ -189,18 +193,24 @@ public class InfoChannel implements Runnable
     IntStream
         .range(0, numShards)
         .forEach(partition -> this.nextOffset[partition] = 0l);
+    channelState = ChannelState.LOAD_IN_PROGRESS;
 
     while (running)
     {
       try
       {
-        ConsumerRecords<String, AbstractMessageTo> records = consumer.poll(Duration.ofMinutes(1));
+        ConsumerRecords<String, AbstractMessageTo> records = consumer.poll(pollingInterval);
         log.debug("Fetched {} messages", records.count());
-        handleMessages(records);
+        for (ConsumerRecord<String, AbstractMessageTo> record : records)
+        {
+          handleMessage(record);
+          updateNextOffset(record.partition(), record.offset() + 1);
+        }
       }
       catch (WakeupException e)
       {
         log.info("Received WakeupException, exiting!");
+        channelState = ChannelState.SHUTTING_DOWN;
         running = false;
       }
     }
@@ -208,47 +218,58 @@ public class InfoChannel implements Runnable
     log.info("Exiting normally");
   }
 
-  private void handleMessages(ConsumerRecords<String, AbstractMessageTo> records)
+  private void updateNextOffset(int partition, long nextOffset)
   {
-    for (ConsumerRecord<String, AbstractMessageTo> record : records)
+    this.nextOffset[partition] = nextOffset;
+    if (channelState == ChannelState.LOAD_IN_PROGRESS)
     {
-      switch (record.value().getType())
+      boolean loadInProgress = IntStream
+          .range(0, numShards)
+          .anyMatch(shard -> this.nextOffset[shard] < currentOffset[shard]);
+      if (!loadInProgress)
       {
-        case EVENT_CHATROOM_CREATED:
-          EventChatRoomCreated eventChatRoomCreated =
-              (EventChatRoomCreated) record.value();
-          createChatRoom(eventChatRoomCreated.toChatRoomInfo());
-          break;
-
-        case EVENT_SHARD_ASSIGNED:
-          EventShardAssigned eventShardAssigned =
-              (EventShardAssigned) record.value();
-          log.info(
-              "Shard {} was assigned to {}",
-              eventShardAssigned.getShard(),
-              eventShardAssigned.getUri());
-          shardOwners[eventShardAssigned.getShard()] = eventShardAssigned.getUri();
-          break;
-
-        case EVENT_SHARD_REVOKED:
-          EventShardRevoked eventShardRevoked =
-              (EventShardRevoked) record.value();
-          log.info(
-              "Shard {} was revoked from {}",
-              eventShardRevoked.getShard(),
-              eventShardRevoked.getUri());
-          shardOwners[eventShardRevoked.getShard()] = null;
-          break;
-
-        default:
-          log.debug(
-              "Ignoring message for key={} with offset={}: {}",
-              record.key(),
-              record.offset(),
-              record.value());
+        log.info("Loading of info completed! Resuming normal operations...");
+        channelState = ChannelState.READY;
       }
+    }
+  }
 
-      nextOffset[record.partition()] = record.offset() + 1;
+  private void handleMessage(ConsumerRecord<String, AbstractMessageTo> record)
+  {
+    switch (record.value().getType())
+    {
+      case EVENT_CHATROOM_CREATED:
+        EventChatRoomCreated eventChatRoomCreated =
+            (EventChatRoomCreated) record.value();
+        createChatRoom(eventChatRoomCreated.toChatRoomInfo());
+        break;
+
+      case EVENT_SHARD_ASSIGNED:
+        EventShardAssigned eventShardAssigned =
+            (EventShardAssigned) record.value();
+        log.info(
+            "Shard {} was assigned to {}",
+            eventShardAssigned.getShard(),
+            eventShardAssigned.getUri());
+        shardOwners[eventShardAssigned.getShard()] = eventShardAssigned.getUri();
+        break;
+
+      case EVENT_SHARD_REVOKED:
+        EventShardRevoked eventShardRevoked =
+            (EventShardRevoked) record.value();
+        log.info(
+            "Shard {} was revoked from {}",
+            eventShardRevoked.getShard(),
+            eventShardRevoked.getUri());
+        shardOwners[eventShardRevoked.getShard()] = null;
+        break;
+
+      default:
+        log.debug(
+            "Ignoring message for key={} with offset={}: {}",
+            record.key(),
+            record.offset(),
+            record.value());
     }
   }
 
@@ -272,6 +293,7 @@ public class InfoChannel implements Runnable
           chatRoomId);
 
       this.chatRoomInfo.put(chatRoomId, chatRoomInfo);
+      this.channelMediator.chatRoomCreated(chatRoomInfo);
     }
   }
 
@@ -282,6 +304,12 @@ public class InfoChannel implements Runnable
 
   Mono<ChatRoomInfo> getChatRoomInfo(UUID id)
   {
+    ChannelState capturedState = channelState;
+    if (capturedState != ChannelState.READY)
+    {
+      return Mono.error(new ChannelNotReadyException(capturedState));
+    }
+
     return Mono.fromSupplier(() -> chatRoomInfo.get(id));
   }