also carried away

2 files changed, 124 insertions, 0 deletions

diff --git a/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/ClusterNodeIndex.cs b/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/ClusterNodeIndex.cs
new file mode 100644
index 0000000..a6e264c
--- /dev/null
+++ b/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/ClusterNodeIndex.cs
@@ -0,0 +1,75 @@
+/*
+* Copyright (c) 2023 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Data.Caching.Providers.VNCache
+* File: ClusterNodeIndex.cs 
+*
+* ClusterNodeIndex.cs is part of VNLib.Data.Caching.Providers.VNCache which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Data.Caching.Providers.VNCache is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Data.Caching.Providers.VNCache is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System.Threading;
+using System.Threading.Tasks;
+
+using VNLib.Utils.Logging;
+using VNLib.Data.Caching.Extensions;
+using VNLib.Data.Caching.Extensions.Clustering;
+using VNLib.Plugins.Extensions.Loading.Events;
+
+namespace VNLib.Data.Caching.Providers.VNCache.Clustering
+{
+    internal sealed class ClusterNodeIndex : IClusterNodeIndex, IIntervalScheduleable
+    {
+        private readonly CacheClientConfiguration _config;
+        private Task _currentUpdate;
+
+
+        public ClusterNodeIndex(CacheClientConfiguration config)
+        {
+            _config = config;
+            _currentUpdate = Task.CompletedTask;
+        }
+
+        ///<inheritdoc/>
+        public CacheNodeAdvertisment? GetNextNode()
+        {
+            //Get all nodes
+            CacheNodeAdvertisment[] ads = _config.NodeCollection.GetAllNodes();
+            //Just get a random node from the collection for now
+            return ads.Length > 0 ? ads.SelectRandom() : null;
+        }
+
+        ///<inheritdoc/>
+        public Task WaitForDiscoveryAsync(CancellationToken cancellationToken)
+        {
+            return _currentUpdate.WaitAsync(cancellationToken);
+        }
+
+        /// <summary>
+        /// Runs the discovery process and updates the current update task
+        /// </summary>
+        /// <param name="log"></param>
+        /// <param name="cancellationToken">A token to cancel the operation</param>
+        /// <returns>A task that completes when the discovery process is complete</returns>
+        public Task OnIntervalAsync(ILogProvider log, CancellationToken cancellationToken)
+        {
+            //Run discovery operation and update the task
+            _currentUpdate = _config.DiscoverNodesAsync(cancellationToken);
+            return Task.CompletedTask;
+        }
+    }
+}
\ No newline at end of file
diff --git a/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/IClusterNodeIndex.cs b/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/IClusterNodeIndex.cs
new file mode 100644
index 0000000..285f405
--- /dev/null
+++ b/plugins/VNLib.Data.Caching.Providers.VNCache/src/Clustering/IClusterNodeIndex.cs
@@ -0,0 +1,49 @@
+/*
+* Copyright (c) 2023 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Data.Caching.Providers.VNCache
+* File: IClusterNodeIndex.cs 
+*
+* IClusterNodeIndex.cs is part of VNLib.Data.Caching.Providers.VNCache which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Data.Caching.Providers.VNCache is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Data.Caching.Providers.VNCache is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System.Threading;
+using System.Threading.Tasks;
+
+using VNLib.Data.Caching.Extensions.Clustering;
+
+namespace VNLib.Data.Caching.Providers.VNCache.Clustering
+{
+    internal interface IClusterNodeIndex
+    {
+        /// <summary>
+        /// Gets the next available node using the configured balancing policy
+        /// or null if no nodes are available
+        /// </summary>
+        /// <returns>The next available node to connect to if any are available</returns>
+        CacheNodeAdvertisment? GetNextNode();
+
+        /// <summary>
+        /// Waits for the discovery process to complete. This is just incase a 
+        /// connection wants to happen while a long discovery is processing.
+        /// </summary>
+        /// <param name="cancellationToken">A token to cancel the operation</param>
+        /// <returns>A task that resolves when the discovery process completes</returns>
+        Task WaitForDiscoveryAsync(CancellationToken cancellationToken);
+    }
+}
\ No newline at end of file