kotlinx-coroutines-core/common/src/channels/RendezvousChannel.kt

/*
 * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.channels

import kotlinx.coroutines.internal.*

/**
 * Rendezvous channel. This channel does not have any buffer at all. An element is transferred from sender
 * to receiver only when [send] and [receive] invocations meet in time (rendezvous), so [send] suspends
 * until another coroutine invokes [receive] and [receive] suspends until another coroutine invokes [send].
 *
 * Use `Channel()` factory function to conveniently create an instance of rendezvous channel.
 *
 * This implementation is fully lock-free.
 **/
internal open class RendezvousChannel<E>(onUndeliveredElement: OnUndeliveredElement<E>?) : AbstractChannel<E>(onUndeliveredElement) {
    protected final override val isBufferAlwaysEmpty: Boolean get() = true
    protected final override val isBufferEmpty: Boolean get() = true
    protected final override val isBufferAlwaysFull: Boolean get() = true
    protected final override val isBufferFull: Boolean get() = true
}