LeaderElection 1.0.3
dotnet add package LeaderElection --version 1.0.3
NuGet\Install-Package LeaderElection -Version 1.0.3
<PackageReference Include="LeaderElection" Version="1.0.3" />
<PackageVersion Include="LeaderElection" Version="1.0.3" />
<PackageReference Include="LeaderElection" />
paket add LeaderElection --version 1.0.3
#r "nuget: LeaderElection, 1.0.3"
#:package LeaderElection@1.0.3
#addin nuget:?package=LeaderElection&version=1.0.3
#tool nuget:?package=LeaderElection&version=1.0.3
Leader Election
A C# implementaion of the distributed leader election pattern using common paradigms.
Features
- Async/Await Support: Full async/await pattern support for better performance and scalability
- Comprehensive Error Handling: Robust error handling with retry logic and exponential backoff
- Structured Logging: Integration with Microsoft.Extensions.Logging for observability
- Configuration Options: Flexible configuration through options pattern
- Event-Driven: Leadership change and error events for reactive programming
- Graceful Shutdown: Proper cleanup and resource disposal
- Thread Safety: Thread-safe operations with proper synchronization
Quick Start
1. Install the Package
dotnet add package LeaderElection
dotnet add package LeaderElection.Redis
2. Configure Services
Look in LeaderElectionTester for a full example.
using LeaderElection.Redis;
var builder = WebApplication.CreateBuilder(args);
// Add Redis connection
builder.Services.AddSingleton<IConnectionMultiplexer>(sp =>
{
return ConnectionMultiplexer.Connect("localhost:6379");
});
// Add leader election with configuration
builder.Services.AddRedisLeaderElection(settings =>
{
settings.LockKey = "leader_election_tester";
settings.LockExpiry = TimeSpan.FromSeconds(30);
settings.RenewInterval = TimeSpan.FromSeconds(10);
settings.RetryInterval = TimeSpan.FromSeconds(5);
settings.MaxRetryAttempts = 3;
settings.EnableGracefulShutdown = true;
});
3. Use in Your Service
public class MyService : BackgroundService
{
private readonly ILeaderElection _leaderElection;
private readonly ILogger<MyService> _logger;
public MyService(ILeaderElection leaderElection, ILogger<MyService> logger)
{
_leaderElection = leaderElection;
_logger = logger;
}
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
// Subscribe to events
_leaderElection.LeadershipChanged += OnLeadershipChanged;
_leaderElection.ErrorOccurred += OnErrorOccurred;
try
{
// Start leader election
await _leaderElection.StartAsync(stoppingToken);
// Run leader tasks
while (!stoppingToken.IsCancellationRequested)
{
await _leaderElection.RunTaskIfLeaderAsync(async () =>
{
_logger.LogInformation("Executing leader task");
await DoLeaderWorkAsync();
}, stoppingToken);
await Task.Delay(TimeSpan.FromSeconds(5), stoppingToken);
}
}
finally
{
// Cleanup
_leaderElection.LeadershipChanged -= OnLeadershipChanged;
_leaderElection.ErrorOccurred -= OnErrorOccurred;
await _leaderElection.StopAsync(stoppingToken);
}
}
private void OnLeadershipChanged(object? sender, bool isLeader)
{
_logger.LogInformation("Leadership changed: {IsLeader}", isLeader);
}
private void OnErrorOccurred(object? sender, Exception exception)
{
_logger.LogError(exception, "Leader election error");
}
}
API Reference
Methods
StartAsync(CancellationToken)
- Start the leader election processStopAsync(CancellationToken)
- Stop the leader election processTryAcquireLeadershipAsync(CancellationToken)
- Manually attempt to acquire leadershipRunTaskIfLeaderAsync(Func<Task>, CancellationToken)
- Execute a task only if this instance is the leaderRunTaskIfLeaderAsync(Action, CancellationToken)
- Execute a synchronous task only if this instance is the leader
Properties
IsLeader
- Returns true if this instance is currently the leaderLastLeadershipRenewal
- Date/Time of the last accquisition of leadership
Events
LeadershipChanged
- Fired when leadership status changesErrorOccurred
- Fired when an error occurs during leader election
Contributing
- Fork the repository
- Create a feature branch
- Make your changes
- Add tests
- Submit a pull request
License
MIT License
Copyright (c) 2025 Greg James
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Icon
"Business icon pack leader icon" by mr icons is licensed under CC BY 4.0
Product | Versions Compatible and additional computed target framework versions. |
---|---|
.NET | net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 was computed. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 was computed. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed. |
-
net8.0
- Microsoft.Extensions.Hosting.Abstractions (>= 9.0.6)
- Microsoft.Extensions.Logging.Abstractions (>= 9.0.6)
NuGet packages (3)
Showing the top 3 NuGet packages that depend on LeaderElection:
Package | Downloads |
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LeaderElection.BlobStorage
Package Description |
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LeaderElection.Redis
Package Description |
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LeaderElection.DistributedCache
Package Description |
GitHub repositories
This package is not used by any popular GitHub repositories.