loggersoft.kotlin.utils.event.SignalImpl.kt Maven / Gradle / Ivy

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/*
 * Copyright (C) 2018 Alexander Kornilov ([email protected])
 *
 * Licensed 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.
 */

package loggersoft.kotlin.utils.event

/**
 * Default implementation of [Signal] and [Subscription] interfaces.
 *
 * @author Alexander Kornilov ([email protected]).
 */
class SignalImpl(override val sender: S) : Signal {
    private val subscriptions = mutableMapOf>()

    override val subscription: Subscription = object : Subscription {

        override fun subscribe(subscriber: Any, receiver: Receiver): Any {
            subscriptions[subscriber] = receiver
            return subscriber
        }

        override fun unsubscribe(subscriber: Any): Boolean
                = subscriptions.remove(subscriber) != null
    }

    override val receivers: Collection>
        get() = subscriptions.values

    override fun hasSubscriber(subscriber: Any): Boolean
            = subscriptions.containsKey(subscriber)

    override fun unsubscribeAll()
            = subscriptions.clear()

    override fun emit(event: E) {
        for(receiver in subscriptions.values) {
            receiver(sender, event)
        }
    }
}