baseline: OpenMU upstream b5a0961 (fresh source)

src/GameLogic/PartyManager.cs

@@ -0,0 +1,62 @@
+// <copyright file="PartyManager.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic;
+
+using MUnique.OpenMU.GameLogic.Views.Party;
+
+/// <summary>
+/// Manages party creation and tracks character-to-party membership for member reconnection.
+/// </summary>
+public sealed class PartyManager : IPartyManager
+{
+    private readonly System.Collections.Concurrent.ConcurrentDictionary<string, Party> _partyByCharacterName = new(StringComparer.Ordinal);
+    private readonly ILogger<Party> _partyLogger;
+    private readonly byte _maxPartySize;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="PartyManager"/> class.
+    /// </summary>
+    /// <param name="maxPartySize">The maximum number of members per party.</param>
+    /// <param name="partyLogger">The logger for party instances.</param>
+    public PartyManager(byte maxPartySize, ILogger<Party> partyLogger)
+    {
+        this._maxPartySize = maxPartySize;
+        this._partyLogger = partyLogger;
+    }
+
+    /// <inheritdoc />
+    public Party CreateParty() => new(this, this._maxPartySize, this._partyLogger);
+
+    /// <inheritdoc />
+    public async ValueTask OnMemberReconnectedAsync(IPartyMember member)
+    {
+        if (!this._partyByCharacterName.TryGetValue(member.Name, out var party))
+        {
+            return;
+        }
+
+        // Find the offline snapshot that was created when the member disconnected.
+        var snapshot = party.PartyList.FirstOrDefault(m => m.Name == member.Name && !m.IsConnected);
+        if (snapshot is null)
+        {
+            // Already replaced (e.g., duplicate reconnect event) — nothing to do.
+            return;
+        }
+
+        await party.ReplaceMemberAsync(snapshot, member).ConfigureAwait(false);
+
+        // Send the full party state to the rejoined player since they missed updates while offline.
+        await member.InvokeViewPlugInAsync<IUpdatePartyListPlugIn>(p => p.UpdatePartyListAsync()).ConfigureAwait(false);
+        await member.InvokeViewPlugInAsync<IPartyHealthViewPlugIn>(p => p.UpdatePartyHealthAsync()).ConfigureAwait(false);
+    }
+
+    /// <inheritdoc />
+    void IPartyManager.TrackMembership(string characterName, Party party)
+        => this._partyByCharacterName[characterName] = party;
+
+    /// <inheritdoc />
+    void IPartyManager.UntrackMembership(string characterName)
+        => this._partyByCharacterName.TryRemove(characterName, out _);
+}