using System;
using System.Threading;
using MediaBrowser.Controller.Session;
using MediaBrowser.Model.SyncPlay;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Controller.SyncPlay
{
///
/// Class PlayingGroupState.
///
///
/// Class is not thread-safe, external locking is required when accessing methods.
///
public class PlayingGroupState : AbstractGroupState
{
///
/// Initializes a new instance of the class.
///
/// Instance of the interface.
public PlayingGroupState(ILogger logger)
: base(logger)
{
// Do nothing.
}
///
public override GroupStateType Type
{
get
{
return GroupStateType.Playing;
}
}
///
/// Gets or sets a value indicating whether requests for buffering should be ignored.
///
public bool IgnoreBuffering { get; set; }
///
public override void SessionJoined(IGroupStateContext context, GroupStateType prevState, SessionInfo session, CancellationToken cancellationToken)
{
// Wait for session to be ready.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.SessionJoined(context, Type, session, cancellationToken);
}
///
public override void SessionLeaving(IGroupStateContext context, GroupStateType prevState, SessionInfo session, CancellationToken cancellationToken)
{
// Do nothing.
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, PlayGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, UnpauseGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
if (!prevState.Equals(Type))
{
// Pick a suitable time that accounts for latency.
var delayMillis = Math.Max(context.GetHighestPing() * 2, context.DefaultPing);
// Unpause group and set starting point in future.
// Clients will start playback at LastActivity (datetime) from PositionTicks (playback position).
// The added delay does not guarantee, of course, that the command will be received in time.
// Playback synchronization will mainly happen client side.
context.LastActivity = DateTime.UtcNow.AddMilliseconds(delayMillis);
var command = context.NewSyncPlayCommand(SendCommandType.Unpause);
context.SendCommand(session, SyncPlayBroadcastType.AllGroup, command, cancellationToken);
// Notify relevant state change event.
SendGroupStateUpdate(context, request, session, cancellationToken);
}
else
{
// Client got lost, sending current state.
var command = context.NewSyncPlayCommand(SendCommandType.Unpause);
context.SendCommand(session, SyncPlayBroadcastType.CurrentSession, command, cancellationToken);
}
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, PauseGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var pausedState = new PausedGroupState(Logger);
context.SetState(pausedState);
pausedState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, StopGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var idleState = new IdleGroupState(Logger);
context.SetState(idleState);
idleState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, SeekGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, BufferGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
if (IgnoreBuffering)
{
return;
}
// Change state.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, ReadyGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
if (prevState.Equals(Type))
{
// Group was not waiting, make sure client has latest state.
var command = context.NewSyncPlayCommand(SendCommandType.Unpause);
context.SendCommand(session, SyncPlayBroadcastType.CurrentSession, command, cancellationToken);
}
else if (prevState.Equals(GroupStateType.Waiting))
{
// Notify relevant state change event.
SendGroupStateUpdate(context, request, session, cancellationToken);
}
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, NextTrackGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.HandleRequest(context, Type, request, session, cancellationToken);
}
///
public override void HandleRequest(IGroupStateContext context, GroupStateType prevState, PreviousTrackGroupRequest request, SessionInfo session, CancellationToken cancellationToken)
{
// Change state.
var waitingState = new WaitingGroupState(Logger);
context.SetState(waitingState);
waitingState.HandleRequest(context, Type, request, session, cancellationToken);
}
}
}