// Copyright (c) 2019 Spotify AB.
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

import Foundation

/// The `AnyEventSource` class implements a `EventSource` type that sends events to subscribers.
public class AnyEventSource<E>: EventSource {
    public typealias Event = E

    private let subscribeClosure: (@escaping Consumer<E>) -> Disposable

    public init<ES: EventSource>(_ base: ES) where ES.Event == E {
        subscribeClosure = base.subscribe
    }

    public init(_ closure: @escaping (@escaping Consumer<E>) -> Disposable) {
        subscribeClosure = closure
    }

    public func subscribe(consumer eventConsumer: @escaping Consumer<E>) -> Disposable {
        return subscribeClosure(eventConsumer)
    }
}
