Server Creation and Configuration

/**
 * ApplicationEngineFactory providing a Netty-based ApplicationEngine
 */
object Netty : ApplicationEngineFactory<NettyApplicationEngine, NettyApplicationEngine.Configuration> {
    /**
     * Create a configuration instance with the provided configuration block
     * @param configure Configuration block to customize engine settings
     * @return Configured NettyApplicationEngine.Configuration instance
     */
    fun configuration(
        configure: NettyApplicationEngine.Configuration.() -> Unit
    ): NettyApplicationEngine.Configuration
    
    /**
     * Create a NettyApplicationEngine instance with the specified parameters
     * @param environment Application environment
     * @param monitor Event monitoring system  
     * @param developmentMode Development mode flag
     * @param configuration Engine configuration
     * @param applicationProvider Function that provides the Ktor Application
     * @return NettyApplicationEngine instance
     */
    fun create(
        environment: ApplicationEnvironment,
        monitor: Events,
        developmentMode: Boolean,
        configuration: NettyApplicationEngine.Configuration,
        applicationProvider: () -> Application
    ): NettyApplicationEngine
}

import io.ktor.server.engine.*
import io.ktor.server.netty.*

// Basic server creation
val server = embeddedServer(Netty, port = 8080) {
    // Application configuration
}

// Server with custom Netty configuration
val server = embeddedServer(Netty, port = 8080) {
    // Configure Netty-specific settings
    runningLimit = 64
    shareWorkGroup = true
    responseWriteTimeoutSeconds = 30
    tcpKeepAlive = true
    enableHttp2 = true
}

/**
 * Configuration for the NettyApplicationEngine
 */
class NettyApplicationEngine.Configuration : BaseApplicationEngine.Configuration() {
    /**
     * Number of threads for connection group (inherited from BaseApplicationEngine.Configuration)
     * Default: 1
     */
    var connectionGroupSize: Int
    
    /**
     * Number of threads for worker group (inherited from BaseApplicationEngine.Configuration)
     * Default: Available processors
     */
    var workerGroupSize: Int
    
    /**
     * Number of threads for call group (inherited from BaseApplicationEngine.Configuration)
     * Default: Available processors
     */
    var callGroupSize: Int
    
    /**
     * Number of concurrently running requests from the same http pipeline
     * Default: 32
     */
    var runningLimit: Int
    
    /**
     * Do not create separate call event group and reuse worker group for processing calls
     * Default: false
     */
    var shareWorkGroup: Boolean
    
    /**
     * User-provided function to configure Netty's ServerBootstrap
     * Default: {} (empty function)
     */
    var configureBootstrap: ServerBootstrap.() -> Unit
    
    /**
     * Timeout in seconds for sending responses to client
     * Default: 10 seconds
     */
    var responseWriteTimeoutSeconds: Int
    
    /**
     * Timeout in seconds for reading requests from client, "0" is infinite
     * Default: 0 (infinite)
     */
    var requestReadTimeoutSeconds: Int
    
    /**
     * If set to true, enables TCP keep alive for connections so all
     * dead client connections will be discarded
     * Default: false
     */
    var tcpKeepAlive: Boolean
    
    /**
     * The url limit including query parameters
     * Default: HttpObjectDecoder.DEFAULT_MAX_INITIAL_LINE_LENGTH
     */
    var maxInitialLineLength: Int
    
    /**
     * The maximum length of all headers.
     * If the sum of the length of each header exceeds this value, a TooLongFrameException will be raised
     * Default: HttpObjectDecoder.DEFAULT_MAX_HEADER_SIZE
     */
    var maxHeaderSize: Int
    
    /**
     * The maximum length of the content or each chunk
     * Default: HttpObjectDecoder.DEFAULT_MAX_CHUNK_SIZE
     */
    var maxChunkSize: Int
    
    /**
     * If set to true, enables HTTP/2 protocol for Netty engine
     * Default: true
     */
    var enableHttp2: Boolean
    
    /**
     * User-provided function to configure Netty's HttpServerCodec
     * Default: Creates HttpServerCodec with maxInitialLineLength, maxHeaderSize, and maxChunkSize
     */
    var httpServerCodec: () -> HttpServerCodec
    
    /**
     * User-provided function to configure Netty's ChannelPipeline
     * Default: {} (empty function)
     */
    var channelPipelineConfig: ChannelPipeline.() -> Unit
}

import io.ktor.server.engine.*
import io.ktor.server.netty.*
import io.netty.bootstrap.ServerBootstrap
import io.netty.channel.ChannelOption

// Advanced configuration example
val server = embeddedServer(Netty, port = 8080) {
    // Thread pool configuration
    connectionGroupSize = 1
    workerGroupSize = 16
    callGroupSize = 32
    
    // Performance tuning
    runningLimit = 128
    shareWorkGroup = true
    
    // Timeout configuration
    responseWriteTimeoutSeconds = 60
    requestReadTimeoutSeconds = 30
    
    // Connection settings
    tcpKeepAlive = true
    
    // HTTP protocol limits
    maxInitialLineLength = 8192
    maxHeaderSize = 16384
    maxChunkSize = 8192
    
    // Protocol support
    enableHttp2 = true
    
    // Custom bootstrap configuration
    configureBootstrap = {
        option(ChannelOption.SO_BACKLOG, 1024)
        childOption(ChannelOption.SO_KEEPALIVE, true)
    }
    
    // Custom pipeline configuration
    channelPipelineConfig = {
        // Add custom handlers to the pipeline
    }
}

// Start the server
server.start(wait = true)

/**
 * Load configuration from ApplicationConfig
 * @param config ApplicationConfig instance containing deployment settings
 */
internal fun NettyApplicationEngine.Configuration.loadConfiguration(config: ApplicationConfig)