Comments (3)
Hi @alastairtree thanks for your interest in the library.
It sounds like what you are really looking for is a distributed semaphore. You may be interested in the discussion on this topic here: #7
In short, there is no automated way to do this with the current library although I am very interested in building one in if we can find a robust and performant implementation. Since you need only 5 concurrent clients, you could likely get away with simply looping over a set of 5 locks until one of them works:
class SqlDistributedSemaphore {
private readonly IReadOnlyList<SqlDistributedLock> _locks;
public SqlDistributedSemaphore(string lockName, int maxCount)
{
this._locks = Enumerable.Range(0, maxCount).Select(i => new SqlDistributedLock(..., lockName: lockName + maxCount)).ToArray();
}
public IDisposable Acquire()
{
Random random = null;
while (true)
{
for (var i = 0; i < this._locks.Count; ++i)
{
var handle = this._locks[i].TryAcquire();
if (handle != null) { return handle; }
}
Thread.Sleep((random ?? random = new Random()).Next(50));
}
}
}
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Duplicate of #7
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Super useful answer, thank you!
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Related Issues (20)
- Increase in lost lock after upgrading to .NET 7, EF Core 7 and Microsoft.Data.SqlClient 5.0.1 HOT 21
- Add custom data to AzureBlobLeaseDistributedLock HOT 10
- Redis: RedisScript (LuaScript) execution error - CultureInfo problem HOT 7
- DistributedLock.Azure: Remove MaxNonInfiniteLeaseDuration HOT 2
- Use Distributed lock to manage multiple calls to the same Azure function HOT 2
- Postgres distributed lock using PgBouncer connection pooler HOT 8
- About Distribute Locking System using Redis HOT 2
- RobiniaDocs API Explorer HOT 8
- Postgres - Multiple threads successfully acquire the same lock HOT 3
- Concurrency with Redis Semaphore HOT 2
- Error acquiring lock on PostgreSQL when using Npgsql 8.0 HOT 5
- PostgreSQL — Exception while using "AcquireAsync" or "TryAcquireAsync" multiple times HOT 3
- DistributedLock.Azure is updated but not released to NuGet HOT 1
- Document Support for Key Prefixes in RedisDistributedLock HOT 3
- Adopt central package management HOT 2
- Add build checks for AOT compat HOT 2
- Update from vulnerable versions of SQL server packages (dependabot PRs)
- Consider updating Azure.Storage.Blobs to latest once linked issue is resolved
- Rename CopyPackageToPublishDirectory.targets to Directory.Build.targets
- Using UseTransaction for SqlServer locks requires explicitly disabling UseMultiplexing
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