Lifecycle events and actions
Gameplay implementation is just one of the steps in creating a perfect game. There are many other factors that affect player experience. One of them, staying in close relation to gameplay, is maintaining the match lifetime and the currently playing squad.
If you prefer hands-on experience, check out “Match events” sample project included in Unity SDK package.
ReminderMake sure Elympics Behaviour component is attached along with your implementation of
IBotHandler. Otherwise, the callbacks won’t be called!
Joining a match
First things first, players can join a match using the following methods:
IElympics.ConnectAndJoinAsPlayer(Action<bool> connectedCallback, CancellationToken ct)– to join as a full player and have one’s input gathered and sent to the server,
IElympics.ConnectAndJoinAsSpectator(Action<bool> connectedCallback, CancellationToken ct)1 – to join in a read-only mode where only one-way (server to client) communication occurs and one is not counted as a match player.
Both of these methods are coroutines returning
IEnumerator. The correct way of running them is using Unity
Client-only actionsThe methods above are client-only actions: make sure to call them only if
Accessing IElympicsJust to remind,
IElympicsinstance is available in every
Normally, there is no need to call
ConnectAndJoinAsPlayer manually as it is done by Elympics when client instance initializes. This behavior is customizable using “Connect On Start” checkbox of Elympics Client editor:
ConnectAndJoinAsSpectator consist of three steps: they establish a connection to the game server, then perform user authentication and finally register a player in the match. Completion of each step can be tracked by implementing the following methods from
nullwhen joining as a spectator,
along with their corresponding error handlers:
Meanwhile on the server, only one callback is executed:
ElympicsPlayer passed here is used to distinguish a player from others in player data array passed as the only parameter of server initialization callback (described below).
Leaving a match
A match can be also left using
IElympics.Disconnect(). If the match isn’t ended immediately by the server, players can rejoin it.
Client-only actionThe method above is a client-only action: make sure to call it only if
As matches with players missing have a great chance of becoming unplayable, you may want to close the server after some delay (using the action described in the next section). To make sure the server is notified about such an event, you have to implement
As before, received in-match player identifier can be used as an index to player data array passed in server initialization callback.
After a client disconnects from the server, it runs its
Finishing a match
As non-finished games take up resources, ending a match is a crucial step. Game server lifetime is currently limited to 24 hours, so no game runs indefinitely. But surely you don’t want your players to wait a whole day until they can play again. Or a 5-minute match to cost you much more than planned.
Default server behaviorWith ending a game being such an important task, SDK provides a default server handler which closes the match automatically as soon as the first player disconnects. Read more below.
The method you need to call is
IElympics.EndGame(). Depending on your circumstances, you can pass an optional parameter of type
ResultMatchPlayerDatas containing match results.
The inclusion of
ResultMatchPlayerDatas object is essential if you want to take advantage of intelligent matchmaking (using Elo rating or machine learning) or other score-related services provided by Elympics.
ResultMatchPlayerDatas is a list of
ResultMatchPlayerData. Each entry should contain data associated with the corresponding player. As there is no player ID included, you should check
InitialMatchPlayerDatas received at the start of the game for the correct order.
ResultMatchPlayerData stores game-specific
byte GameEngineData and
float MatchmakerData with a structure defined by Elympics.
MatchmakerData must contain two elements:
- Matchmaker-compatible score. The greater this number is, the higher matchmaker rating. If your game takes a different approach (e.g. you’re creating a racing game where time becomes the score), you have to transform your data appropriately.
- Game-specific score details. You can put original, unprocessed score here.
You can read more about the matchmaker in the next chapter.
Of course, there are some situations when a match ends with no meaningful results to send to the matchmaker, e.g. not all players joined the game to begin with. In such case you should call
EndGame() with no arguments.
When a match ends, the following callbacks are run on clients (in the order listed):
Half remote“Half Remote” development mode doesn’t currently support the two events listed above. However, the lifetime of a local server can be manipulated freely.
OnDisconnectedByServeris only run at the end of a match. Despite what the name may suggest, there is no possibility of kicking a player from an ongoing game.
As mentioned earlier, it’s really important to end a game correctly. This is why Elympics prefab includes DefaultServerHandler which closes the match if any connected player leaves. It also calls
EndGame() if not all players join the game in the first 30 seconds of server lifetime.
The handler outputs logs to console when players connect and disconnect and when it decides if the game should be ended.
Messages such as “Waiting for game to start” could make you think that games are started using a method analogous to
EndGame(). However, that is not true. The start of a server means the start of a match.
Providing a custom implementation
If the behavior described above is not suited for your game, you can disable the built-in implementation of
Required replacementBefore disabling DefaultServerHandler make absolutely sure at least one of your implementations of
DefaultServerHandler script checks
Behaviour.isActiveAndEnabled property in every implemented
IServerHandler method, so you can untick
DefaultServerHandler component or the whole DefaultServerHandler object in inspector to prevent it from executing.
Alternatively you can just remove
DefaultServerHandler component from DefaultServerHandler object in the instance of Elympics prefab.
Disabling and deactivating Elympics scriptsWhen it comes to disabling script components and deactivating objects, DefaultServerHandler is an exception. All other synchronized behaviors remain unaffected by such settings unless you implement a similar explicit check in your code.
DefaultServerHandler class is a good starting point for implementing a custom server lifetime guard. After copying the code, you can modify it to suit your needs.
When a game instance starts, an initialization callback is run with game and player data passed as the only parameter. To retrieve the data you can implement appriopriate methods of
The data is stored as instances of
InitialMatchPlayerData. The class consists of the following properties:
ElympicsPlayer Player– in-match player identifier,
string UserId– globally unique player identifier,
bool IsBot– information if player is a bot,
double BotDifficulty– how well a bot should play (if the player is a bot),
byte GameEngineData– optional game-specific data which you can use to provide initial settings for a match,
float MatchmakerData– optional game and player-related data for matchmaker to learn from (if ML matchmaking is enabled).
For a server, the method is
IServerHandler.OnServerInit(InitialMatchPlayerDatas initialMatchPlayerDatas). It provides not a single instance of
InitialMatchPlayerData, but a list of such objects. Each object corresponds to one of match players.
For a client, you should implement
There is also
IClientHandler.OnClientsOnServerInit(InitialMatchPlayerDatas data) used only in “Local Player And Bots” development mode. For convenience, it provides a list of all clients run inside the server instance.
For a bot, you can use
IBotHandler.OnBotsOnServerInit(InitialMatchPlayerDatas initialMatchPlayerDatas) as running bots inside the server instance is the default option. As in the case of
OnClientsOnServerInit, the method provides a list of data of all bots running in the server.
If you changed the setting, you should use
OnStandaloneBotInit(InitialMatchPlayerData initialMatchPlayerData) instead.
The setting is available in Elympics Game Config:
There are two points at which you can input
MatchmakerData for your game to use during the initialization process.
The first is when you call
ElympicsLobbyClient.PlayOnline(). This method accepts four optional parameters, including
float matchmakerData = null and
byte gameEngineData = null. Check out the next chapter for more details.
Initial match data in development modes
Development modes (
Debug Online Player,
Half Remote and
Local Players and Bots) aren’t started using
PlayOnline(). You need to place game engine and matchmaker data in Test players section of your Elympics Game Config instead.
The second approach requires using your own back end. The definition of needed endpoints can be found in External Game Backend integration chapter, along with instructions on how to configure the back-end address to be used by your game.
The one last callback to describe is
IClientHandler.OnSynchronized(TimeSynchronizationData data). It is called every time a client synchronizes its clock with the server (using NTP protocol).
An implementation of this method can be used to track the condition of network connection using information from
TimeSynchronizationData object passed as the only parameter. For example
RoundTripDelay property can be displayed as “ping” in an in-game UI.
The spectator mode is an experimental feature. Its behavior may change in future releases. ↩︎
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