Velocity

This page describes how to integrate Lamp with Velocity 3+, as well as what to expect out of it.

Setting up

Prerequisites

• Java 17 or newer

Adding Lamp dependency

To add Lamp to your project, add the following (depending on your project structure):

pom.xml

<dependencies>
  <!-- Required for all platforms -->
  <dependency>
      <groupId>io.github.revxrsal</groupId>
      <artifactId>lamp.common</artifactId> 
      <version>[VERSION]</version>
  </dependency>

  <!-- Velocity module -->
  <dependency>
      <groupId>io.github.revxrsal</groupId>
      <artifactId>lamp.velocity</artifactId>
      <version>[VERSION]</version>
  </dependency>  
  
  <!-- Optional: Brigadier module -->
  <dependency>
      <groupId>io.github.revxrsal</groupId>
      <artifactId>lamp.brigadier</artifactId>
      <version>[VERSION]</version>
  </dependency>
</dependencies>

build.gradle

dependencies {
   // Required for all platforms
   implementation 'io.github.revxrsal:lamp.common:[VERSION]'
   
   // Velocity module
   implementation 'io.github.revxrsal:lamp.velocity:[VERSION]'
   
   // Optional: Brigadier module
   implementation 'io.github.revxrsal:lamp.brigadier:[VERSION]'
}

build.gradle.kts

dependencies {
    // Required for all platforms
    implementation("io.github.revxrsal:lamp.common:[VERSION]")
    
    // Velocity module
    implementation("io.github.revxrsal:lamp.velocity:[VERSION]")
    
    // Optional: Brigadier module
    implementation("io.github.revxrsal:lamp.brigadier:[VERSION]")
}

Latest version:

Optional: Preserve parameter names

Lamp identifies parameters by their names and uses them to generate relevant command metadata. By default, Java does not preserve parameter names reflectively. You need to add the following to your project:

pom.xml

<plugins>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
      <compilerArgs>
        <!-- Preserves parameter names -->
        <arg>-parameters</arg>
      </compilerArgs>
    </configuration>
  </plugin>
</plugins>

build.gradle

compileJava { 
    // Preserve parameter names in the bytecode
    options.compilerArgs += ["-parameters"]
}

// optional: if you're using Kotlin
compileKotlin {
    kotlinOptions.javaParameters = true
}

build.gradle.kts

tasks.withType<JavaCompile> {
    // Preserve parameter names in the bytecode
    options.compilerArgs.add("-parameters")
}

// optional: if you're using Kotlin
tasks.withType<KotlinJvmCompile> {
    compilerOptions {
        javaParameters = true
    }
}

Velocity-specific annotations

@CommandPermission

Adds a command permission for the given command

Supported Velocity types

• com.velocitypowered.api.command.CommandSource and its subclasses in place of CommandActor

• com.velocitypowered.api.proxy.Player

Example

Java

@Plugin(
    id = "myplugin",
    name = "MyPlugin",
    version = "1.0",
    description = "A simple Velocity plugin",
    authors = {"YourName"}
)
public class MyPlugin {

    private final ProxyServer server;
    private final Lamp<VelocityCommandActor> lamp;

    @Inject
    public MyPlugin(ProxyServer server, @DataDirectory Path dataDirectory) {
        this.server = server;
        this.lamp = VelocityLamp.builder(this, server).build();
        lamp.register(new MyCommand());
    }

    public static class MyCommand {

        @Command("hello")
        @CommandPermission("myplugin.hello")
        public void hello(VelocityCommandActor actor) {
            ...
        }
    }
}

Kotlin

@Plugin(
    id = "myplugin",
    name = "MyPlugin",
    version = "1.0",
    description = "A simple Velocity plugin",
    authors = ["YourName"]
)
class MyPlugin @Inject constructor(
    private val server: ProxyServer,
    @DataDirectory private val dataDirectory: Path
) {

    private val lamp = VelocityLamp.builder(this, server).build()

    init {
        lamp.register(MyCommand())
    }

    class MyCommand {

        @Command("hello")
        @CommandPermission("myplugin.hello")
        fun hello(actor: VelocityCommandActor) {
            ...
        }
    }
}