/// <summary>
/// Subscribe an EventSystemBase to get reader updates.
/// </summary>
/// <param name="eventSystem"> The event system. </param>
internal void Subscribe(EventSystemBase eventSystem)
{
Assert.IsFalse(this._disposed);
Assert.IsFalse(this._subscribers.Contains(eventSystem));
this._subscribers.Add(eventSystem);
}
/// <summary>
/// Unsubscribe an EventSystemBase to stop getting reader updates.
/// </summary>
/// <param name="eventSystem"> The event system. </param>
internal void Unsubscribe(EventSystemBase eventSystem)
{
Assert.IsFalse(this._disposed);
Assert.IsTrue(this._subscribers.Contains(eventSystem));
this._subscribers.Remove(eventSystem);
// No more subscribers, clean up the bus
if (this._subscribers.Count == 0)
{
Instances.Remove(this._key);
this._disposed = true;
}
// Must release streams before call unsubscribe.
#if ENABLE_UNITY_COLLECTIONS_CHECKS
foreach (var streamPair in this._streams)
{
Assert.IsFalse(streamPair.Value.Systems.Remove(eventSystem));
}
#endif
}
/// <summary>
/// Return a set of streams that the system has finished reading.
/// </summary>
/// <param name="owner"> The system the streams are coming from. </param>
/// <param name="streamsToRelease"> The collection of streams to be released. </param>
/// <param name="inputHandle"> The dependency handle. </param>
/// <returns> New dependency handle. </returns>
internal JobHandle ReleaseStreams(EventSystemBase owner, IReadOnlyList <NativeEventStream> streamsToRelease, JobHandle inputHandle)
{
Assert.IsFalse(this._disposed);
var outputHandle = inputHandle;
for (var index = 0; index < streamsToRelease.Count; index++)
{
var stream = streamsToRelease[index];
Assert.IsTrue(this._streams.ContainsKey(stream));
var handles = this._streams[stream];
// Remove the owner handle
bool result = handles.Systems.Remove(owner);
Assert.IsTrue(result);
var handle = JobHandle.CombineDependencies(handles.Handle, inputHandle);
// No one else using stream, need to dispose
if (handles.Systems.Count == 0)
{
this._pool.Return(handles);
this._streams.Remove(stream);
stream.Dispose(handle);
}
else
{
handles.Handle = handle;
}
outputHandle = JobHandle.CombineDependencies(outputHandle, handle);
}
return(outputHandle);
}
/// <summary> Add a set of event streams to be shared with other systems. </summary>
/// <param name="owner"> The system that owns the streams. </param>
/// <param name="type"> The type of the event. </param>
/// <param name="newStreams"> The streams. </param>
/// <param name="consumerHandle"> The dependency handle for these streams. </param>
/// <returns> The new dependency handle. </returns>
/// <exception cref="ArgumentException"> Thrown if this owner is not subscribed. </exception>
internal JobHandle AddStreams(EventSystemBase owner, Type type, IReadOnlyList <NativeEventStream> newStreams, JobHandle consumerHandle)
{
Assert.IsFalse(this._disposed);
if (!this._subscribers.Contains(owner))
{
throw new ArgumentException("Owner not subscribed");
}
if (newStreams.Count == 0)
{
return(consumerHandle);
}
if (this._subscribers.Count == 1)
{
// No subscribers other than ourselves, just dispose the streams
JobHandle handle = consumerHandle;
for (var index = 0; index < newStreams.Count; index++)
{
// var stream = newStreams[index];
// handle = JobHandle.CombineDependencies(handle, stream.Dispose(consumerHandle));
newStreams[index].Dispose(consumerHandle);
}
return(handle);
}
for (var index = 0; index < newStreams.Count; index++)
{
var stream = newStreams[index];
var handles = this._pool.Get();
handles.Handle = consumerHandle;
this._streams.Add(stream, handles);
for (var i = 0; i < this._subscribers.Count; i++)
{
var subscriber = this._subscribers[i];
if (subscriber == owner)
{
continue;
}
handles.Systems.Add(subscriber);
}
}
// Fire off these new readers
for (var i = 0; i < this._subscribers.Count; i++)
{
var subscriber = this._subscribers[i];
if (subscriber == owner)
{
continue;
}
subscriber.AddExternalReaders(type, newStreams, consumerHandle);
}
return(consumerHandle);
}
/// <summary> Initializes a new instance of the <see cref="Extensions{T}"/> struct. </summary>
/// <param name="eventSystem"> Event system parent. </param>
internal Extensions(EventSystemBase eventSystem)
{
this._eventSystem = eventSystem;
}