Getting Started

A guide that should kickstart your usage of Proton. Prefer to go through an example? Check out the global chat walkthrough.

Proton as a Dependency

Using Maven

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

<dependency>
    <groupId>com.github.mcgrizzz</groupId>
    <artifactId>Proton</artifactId>
    <version>v1.1.2</version>
    <scope>provided</scope>
</dependency>

Using Gradle

repositories {
    ...
    maven { url 'https://jitpack.io' }
}

dependencies {
        implementation 'com.github.mcgrizzz:Proton:v1.1.2'
}

Setting-up

Setting-up RabbitMQ

If you want to use Proton with RabbitMQ, you will first need to set up an instance of RabbitMQ.

You can do this in one of two ways:

1. Host it yourself

Here is a great guide to setting it up yourself: https://www.rabbitmq.com/download.html

You will most likely need to setup a new username and password for your rabbitMQ instance: https://www.rabbitmq.com/access-control.html#user-management

This is for two reasons. One, RabbitMQ restricts the access of the default guest account only to localhost connections. Two, leaving the default username/password leaves you open to attacks.

2. Find an online host

Here are some hosts for RabbitMQ that you may find helpful. One of them actually has a free tier that may fit your needs.

Stackhero - No free tiers but the lowest tier can probably support up to 200 servers
CloudAMQP - Expensive dedicated servers but there are cheaper and free shared servers.

*When choosing a host and plan consider your network's size and needs.

Setting-up Redis

This section is under-construction. Please take a look at Redis Quickstart

Proton's `config.yml`

Before integrating with Proton, you should configure your servers' Proton configs.

Let's take a look at the config.

rabbitMQ:
  useRabbitMQ: true
  host: "localhost"
  virtualHost: '/'
  port: 5672
  authorization:
    useAuthorization: true
    username: guest
    password: guest
redis:
  useRedis: false
  host: "localhost"
  port: 6379
  usePassword: true
  password: "password"
identification:
  clientName: "client1"
  groups: []
bStatsEnabled: true

There are a lot of options here, but let's look at them in smaller pieces.

The first section is for the configuration of RabbitMQ.

useRabbitMQ sets whether Proton will try to use RabbitMQ host is the ip of your RabbitMQ instance. port is its port which you will probably not need to change. virtualHost is the virtual host which you can think of as an extension of the host. If you want to learn more about this there's a great writeup here. useAuthorization sets whether Proton should try to authorize the connection username is the username for the connection password is the password for the connection

rabbitMQ:
  useRabbitMQ: true
  host: "localhost"
  virtualHost: '/'
  port: 5672
  authorization:
    useAuthorization: true
    username: guest
    password: guest

Next we have the Redis section of the config.

useRedis sets whether Proton will try to use Redis. (NOTE: Proton only uses one service at a time, if both are selected, Proton will use RabbitMQ) host is the ip of your Redis instance. port is its port usePassword sets whether Proton will try to use a password for the connection useAuthorization is the password Proton will try to use. username is the username for the connection password is the password for the connection

redis:
  useRedis: false
  host: "localhost"
  port: 6379
  usePassword: true
  password: "password"

Lastly, we have the identification section of the config. This is what Proton uses to know which servers are which.

clientName should be a unique name to your server. No two servers should have the same name. This is important if you want to know later on which server a message came from.

groups is a list of groups that the current server belongs to. For example, you can have a server that belongs to the group 'hub'. Therefore, when you send a message to the hub group, only servers in that group will receive that message. You can leave groups empty if you don't need it.

identification:
  clientName: "client1"
  groups: []

bStatsEnabled is a boolean value that enabled basic metric collection. You can disable this if you like.

Your plugin

Just make sure that in your plugin.yml, you include the dependency for Proton.

main: org.test.Test
name: TestPlugin
version: 1.0
depend:
  - Proton

Proton Usage

Getting an instance to `ProtonManager`

To start using Proton, you should first get an instance of ProtonManager.

private ProtonManager protonManager;

@Override
public void onEnable() {
    this.protonManager = Proton.getProtonManager();
}

ProtonManager should not be null at this point. If it is, check your console for connection and configuration errors.

Sending your first message

Now that you have a reference to ProtonManager, you can send your first message.

String namespace = "namespace";
String subject = "subject";
String recipient = "recipient";
Object data = new Object();
protonManager.send(namespace, subject, data, recipient);

Let's break down these arguments.

namespace identifies your organization or plugin. This is what keeps your messages within the scope of your plugin or organization
subject is used to identify the type of message you're sending, you can put any value, but we recommend something relevant and descriptive.
recipient is used to define the client or group you wish to send to.
data is the object that you wish to send.

The data you send can be any object or primitive. The only caveat is that is that is must be Json serializable. Otherwise, you will receive exceptions.

If you want to send a message to all clients that may be listening to a specific namespace and subject you can use the broadcast method instead:

String namespace = "myPluginOrOrganization";
String subject = "subjectOfMyMessage";
Object data = new Object();
protonManager.broadcast(namespace, subject, data);

namespace and subjectform what is called a MessageContext. Each MessageContext can only have one defined datatype. So if you define a namespace and subject, make sure you always send the same type of data through that context.

The use of . (period) is not allowed when defining a namespace, subject, recipient, or group. It is a reserved character used for internal processing.

Receiving a message

We tried to model the message receive system similarly to the Event system you probably use regularly.

In any class or object, you can define a MessageHandler. A MessageHandler is an annotated method which receives data for a specific MessageContext.

Let's take a look at the receiving end of the message sent above.

class MyClass {
    ...
    @MessageHandler(namespace="namespace", subject="subject")
    public void anyMethodName(Object data){
        //do something with the data received
    }
    ...
}

If you want to know the sender of the message, you can attach a second parameter to your MessageHandler method.

class MyClass {
    ...
    @MessageHandler(namespace="namespace", subject="subject")
    public void anyMethodName(Object data, MessageAttributes attr){
        String senderName = attr.getSenderName();
        UUID senderID = attr.getSenderID();
    }
    ...
}

The code within a MessageHandler is synchronous with Bukkit by default. This was a design decision to match the fact that most API calls must be synchronous. However, you can receive messages asynchronously if you wish by adding an optional attribute.

@MessageHandler(namespace="namespace", subject="subject", async=true)

The final step to actual receive any messages, is to register your MessageHandler(s). Similarly to the Event API, you just register your class instance with the ProtonManager.

@Override
public void onEnable() {
    this.protonManager = Proton.getProtonManager();
    if(this.protonManager != null){
        this.protonManager.registerMessageHandlers(this, new MyClass());   
    }
}

If you want, you can register all of your handlers in one call.

this.protonManager.registerMessageHandlers(this, handler1, handler2, handler3...);

If you have any lingering questions, feel free to consult the examples repo. You can also submit question issue here.

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Last updated 3 years ago

Proton as a Dependency

Using Maven

Using Gradle

Setting-up

Setting-up RabbitMQ

Setting-up Redis

Proton's config.yml

Your plugin

Proton Usage

Getting an instance to ProtonManager

Sending your first message

Receiving a message

Proton's `config.yml`

Getting an instance to `ProtonManager`