firebase-ios-sdk/FirebaseSessions/Sources/Public/SessionsDependencies.swift

//
// Copyright 2022 Google LLC
//
// 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.

import Foundation

// Sessions Dependencies determines when a dependent SDK is
// installed in the app. The Sessions SDK uses this to figure
// out which dependencies to wait for to getting the data
// collection state.
//
// This is important because the Sessions SDK starts up before
// dependent SDKs
@objc(FIRSessionsDependencies)
public class SessionsDependencies: NSObject {
  static var dependencies: Set<SessionsSubscriberName> = .init()

  @objc public static func addDependency(name: SessionsSubscriberName) {
    SessionsDependencies.dependencies.insert(name)
  }
}