//
// Copyright Amazon.com Inc. or its affiliates.
// All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//

import Foundation

/// Connection to make subscriptions
public protocol SubscriptionConnection {

    /// Subscribe to the subscription request
    /// - Parameter variables: variables for the subscription
    /// - Parameter requestString: query for the subscription
    /// - Parameter eventHandler: event handler
    func subscribe(
        requestString: String,
        variables: [String: Any?]?,
        eventHandler: @escaping SubscriptionEventHandler
    ) -> SubscriptionItem

    /// Unsubscribe from the subscription
    /// - Parameter item: item to be unsubscribed
    func unsubscribe(item: SubscriptionItem)
}