Performance tweaks for Ktor (#794)

* Ktor testing

* Small response tweaks

* Use JDBC for connections

* Tweaks for Ktor's Netty and query param summation

* Drop tuning parameters on Ktor Netty engine

Author: bjhham

frameworks/ktor/Dockerfile

@@ -16,6 +16,7 @@ ENTRYPOINT ["java", \
   "-XX:+UseNUMA", \
   "-XX:+AlwaysPreTouch", \
   "-XX:-OmitStackTraceInFastThrow", \
+  "-Dio.netty.transport.noNative=false", \
   "-Dio.netty.buffer.checkBounds=false", \
   "-Dio.netty.buffer.checkAccessible=false", \
   "-Dio.netty.allocator.maxOrder=10", \

frameworks/ktor/build.gradle.kts

@@ -22,11 +22,15 @@ dependencies {
     implementation(ktorLibs.server.htmlBuilder)
 
     implementation(libs.exposed.core)
-    implementation(libs.exposed.r2dbc)
+    implementation(libs.exposed.jdbc)
     implementation(libs.exposed.json)
     implementation(libs.logback.classic)
     implementation(libs.postgresql)
-    implementation(libs.r2dbc.pool)
+    implementation(libs.hikaricp)
+    runtimeOnly(libs.netty.native.epoll)
+
+    testImplementation(kotlin("test"))
+    testImplementation(ktorLibs.server.testHost)
 }
 
 ktor {

frameworks/ktor/gradle/libs.versions.toml

@@ -4,13 +4,14 @@ kotlin = "2.3.21"
 
 [libraries]
 logback-classic = { module = "ch.qos.logback:logback-classic", version = "1.5.15" }
+netty-native-epoll = { module = "io.netty:netty-transport-native-epoll", version = "4.2.14.Final" }
 
 # Database
 exposed-core = { module = "org.jetbrains.exposed:exposed-core", version.ref = "exposed" }
-exposed-r2dbc = { module = "org.jetbrains.exposed:exposed-r2dbc", version.ref = "exposed" }
+exposed-jdbc = { module = "org.jetbrains.exposed:exposed-jdbc", version.ref = "exposed" }
 exposed-json = { module = "org.jetbrains.exposed:exposed-json", version.ref = "exposed" }
-postgresql = { module = "org.postgresql:r2dbc-postgresql", version = "1.1.1.RELEASE" }
-r2dbc-pool = { module = "io.r2dbc:r2dbc-pool", version = "1.0.2.RELEASE" }
+postgresql = { module = "org.postgresql:postgresql", version = "42.7.4" }
+hikaricp = { module = "com.zaxxer:HikariCP", version = "6.2.1" }
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }