using System;

namespace Unosquare.Swan.Abstractions {
  /// <summary>
  /// Represents event arguments whenever the state of an application service changes.
  /// </summary>
  public class AppWorkerStateChangedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="AppWorkerStateChangedEventArgs" /> class.
    /// </summary>
    /// <param name="oldState">The old state.</param>
    /// <param name="newState">The new state.</param>
    public AppWorkerStateChangedEventArgs(AppWorkerState oldState, AppWorkerState newState) {
      this.OldState = oldState;
      this.NewState = newState;
    }

    /// <summary>
    /// Gets the state to which the application service changed.
    /// </summary>
    /// <value>
    /// The new state.
    /// </value>
    public AppWorkerState NewState {
      get;
    }

    /// <summary>
    /// Gets the old state.
    /// </summary>
    /// <value>
    /// The old state.
    /// </value>
    public AppWorkerState OldState {
      get;
    }
  }
}