Оптимизировано получение пакетов

src/main/java/ru/serega6531/packmate/controller/PacketController.java

@@ -5,13 +5,11 @@ import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
-import ru.serega6531.packmate.model.Stream;
+import ru.serega6531.packmate.model.Packet;
 import ru.serega6531.packmate.model.pojo.PacketDto;
 import ru.serega6531.packmate.service.StreamService;
 
-import java.util.Collections;
 import java.util.List;
-import java.util.Optional;
 import java.util.stream.Collectors;
 
 @RestController
@@ -27,14 +25,10 @@ public class PacketController {
 
     @PostMapping("/{streamId}")
     public List<PacketDto> getPacketsForStream(@PathVariable long streamId) {
-        final Optional<Stream> stream = streamService.find(streamId);
+        List<Packet> packets = streamService.getPackets(streamId);
-        if (stream.isPresent()) {
+        return packets.stream()
-            return stream.get().getPackets().stream()
                 .map(streamService::packetToDto)
                 .collect(Collectors.toList());
-        } else {
-            return Collections.emptyList();
-        }
     }
 
 }

src/main/java/ru/serega6531/packmate/model/Packet.java

@@ -36,7 +36,7 @@ public class Packet {
     @Transient
     private int ttl;
 
-    @ManyToOne(optional = false)
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
     @JoinColumn(name = "stream_id", nullable = false)
     private Stream stream;
 

src/main/java/ru/serega6531/packmate/repository/StreamRepository.java

@@ -6,6 +6,8 @@ import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import ru.serega6531.packmate.model.Stream;
 
+import java.util.Optional;
+
 public interface StreamRepository extends JpaRepository<Stream, Long>, JpaSpecificationExecutor<Stream> {
 
     @Query("UPDATE Stream SET favorite = :favorite WHERE id = :id")
@@ -14,4 +16,11 @@ public interface StreamRepository extends JpaRepository<Stream, Long>, JpaSpecif
 
     long deleteByEndTimestampBeforeAndFavoriteIsFalse(long threshold);
 
+    @Query("SELECT s FROM Stream s " +
+            "LEFT JOIN FETCH s.packets AS packets " +
+            "LEFT JOIN FETCH packets.matches " +
+            "WHERE s.id = :id"
+    )
+    Optional<Stream> getStreamWithPackets(long id);
+
 }

src/main/java/ru/serega6531/packmate/service/StreamService.java

@@ -7,10 +7,12 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.jpa.domain.Specification;
+import org.springframework.http.HttpStatus;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.server.ResponseStatusException;
 import ru.serega6531.packmate.model.*;
 import ru.serega6531.packmate.model.enums.PatternActionType;
 import ru.serega6531.packmate.model.enums.PatternDirectionType;
@@ -242,8 +244,10 @@ public class StreamService {
         return saved;
     }
 
-    public Optional<Stream> find(long id) {
+    public List<Packet> getPackets(long streamId) {
-        return repository.findById(id);
+        return repository.getStreamWithPackets(streamId)
+                .map(Stream::getPackets)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND));
     }
 
     /**