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authortherealbush <therealbush@users.noreply.github.com>2022-04-23 15:22:18 -0700
committertherealbush <therealbush@users.noreply.github.com>2022-04-23 15:22:18 -0700
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+# EVENTBUS
+
+<img src="https://tokei.rs/b1/github/therealbush/eventbus-kotlin" alt="lines of code"/>
+<img src="https://img.shields.io/github/languages/code-size/therealbush/eventbus-kotlin" alt="code size"/>
+[![](https://jitpack.io/v/therealbush/eventbus-kotlin.svg)](https://jitpack.io/#therealbush/eventbus-kotlin)
+[![](https://jitpack.io/v/therealbush/eventbus-kotlin/month.svg)](https://jitpack.io/#therealbush/eventbus-kotlin)<br>
+
+*A simple, thread safe, and fast event dispatcher for Kotlin/JVM and Java.*
+
+## Features
+
+#### Simple to Use
+
+Simple setup, and easy to learn, logical API
+
+#### Thread Safe
+
+Non locking event posting, and minimally locking registering/subscribing make this event dispatcher fit for use in
+highly concurrent applications.
+
+#### Fast
+
+Because there is no reflection during event posting, and subscribers are cached after the first use of reflection, this
+event dispatcher is much faster than other reflection based alternatives.
+
+#### Flexible
+
+This event dispatcher supports third party events, such as those used in MinecraftForge, and uses the Unsafe API to get
+the value of a "cancelled" property at the same speed as direct access.
+
+#### Parallel Event Posting
+
+Listeners can be parallel, and they will be called on a Coroutine in the background. This is useful for heavy operations
+that may slow down the posting thread.
+
+## Usage
+
+### Adding to your project:
+
+If you have not already, add Jitpack as a repository:
+
+```groovy
+repositories {
+ maven { url 'https://jitpack.io' }
+}
+```
+
+Add the release of your choice in the dependencies block:
+
+```groovy
+dependencies {
+ implementation 'com.github.therealbush:eventbus-kotlin:1.0.0'
+}
+```
+
+### Creating an EventBus:
+
+`EventBus` can take a `Config` as an argument, however it is not required.
+
+`Config` has four parameters. The following are the default arguments:
+
+```kotlin
+Config(
+ logger = LogManager.getLogger("Eventbus"),
+ parallelScope = CoroutineScope(Dispatchers.Default),
+ thirdPartyCompatibility = true,
+ annotationRequired = false
+)
+```
+
+#### logger
+
+The `Logger` this `EventBus` will use to log errors, or `EventBus#debug`
+
+#### parallelScope
+
+The `CoroutineScope` to use when posting events to parallel listeners. The default value will work just fine, but you
+can specify a custom scope if desired.
+
+[What is a Coroutine?](https://kotlinlang.org/docs/coroutines-overview.html)
+
+#### thirdpartyCompatibility
+
+Whether this `EventBus` should try to find a "cancelled" field in events being listened for that are not a subclass
+of `Event`. This is experimental, and should be set to `false` if problems arise.
+
+#### annotationRequired
+
+Whether listeners need to be annotated with `@EventListener` to be subscribed to this
+`EventBus`. This has no effect on anything else, and is just to improve code readability.
+
+### Creating an Event:
+
+Any class can be posted to an `EventBus`, but if you wish to use the base event class, extend `Event`, and implement the
+property `cancellable`.
+
+```kotlin
+class SimpleEvent : Event() {
+ override val cancellable = true
+}
+```
+
+```java
+public class SimpleEvent extends Event {
+ @Override
+ protected boolean getCancellable() {
+ return false;
+ }
+}
+```
+
+### Creating a Listener:
+
+Listeners are created by using the `listener` function:
+
+```kotlin
+listener<EventType>(priority = 0, parallel = false, receiveCancelled = false) {
+ ...listener body ...
+}
+```
+
+```java
+listener(EventType.class,0,false,false,event->{
+ ...listener body...
+ });
+```
+
+Listeners can be registered either directly with `EventBus#register`, or subscribed by returning them from a function or
+property and subscribing the object they belong to with `EventBus#subscribe`.
+
+The following are all valid. Listeners should be public, but they don't need to be.
+
+```kotlin
+val listener0 = listener<EventType> {
+ ...listener body ...
+}
+
+val listener1
+ get() = listener<EventType> {
+ ...listener body ...
+ }
+
+fun listener2() = listener<EventType> {
+ ...listener body ...
+}
+```
+
+```java
+public Listener listener0=listener(EventType.class,event->{
+ ...listener body...
+ });
+
+public Listener listener1(){
+ return listener(EventType.class,event->{
+ ...listener body...
+ });
+ }
+```
+
+#### priority
+
+The priority of this `Listener`. Listeners with a higher priority will receive events before listeners with a lower
+priority.
+
+#### parallel
+
+Whether this `Listener` should be called on the thread that called `EventBus#post`, or on the
+`CoroutineScope` in `Config#parallelScope`. `EventBus#post` will not wait for parallel listeners to complete.
+
+*Currently, there is no way to get a reference to the `Job` created by `launch` when posting to parallel listeners, and
+listeners are not `suspend` lambdas. This may change in the future.*
+
+#### receiveCancelled
+
+Whether this `Listener` should receive events that have been cancelled. This will work on third party events
+if `Config#thirdPartyCompatibility` is enabled.
+
+### Subscribing an Object:
+
+Calling `EventBus#subscribe` and `EventBus#unsubscribe` with an object will add and remove listeners belonging to that
+object from the EventBus. Only listeners in subscribed objects will receive events.
+
+Companion objects and singleton object classes can be subscribed, but subscribing a KClass will not work.
+
+### Posting an Event:
+
+Calling `EventBus#post` will post an event to every listener with an **exactly** matching event type. For example, if
+event B extends event A, and event A is posted, B listeners will not receive it.
+
+Events are **not** queued: only listeners currently subscribed will be called.
+
+`EventBus#post` will return true if the posted event is cancelled after posting it to sequential listeners. Event cancel
+state is checked once before posting to parallel listeners, because order is not guaranteed.
+
+### Still Confused?
+
+Read [this](https://github.com/therealbush/eventbus-kotlin/tree/master/src/test) for usage examples.