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PoolManager.cs

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PoolManager.cs

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using System;
using System.Collections.Concurrent;
namespace Npgsql;
/// <summary>
/// Provides lookup for a pool based on a connection string.
/// </summary>
/// <remarks>
/// Note that pools created directly as <see cref="NpgsqlDataSource" /> are referenced directly by users, and aren't managed here.
/// </remarks>
static class PoolManager
{
internal static ConcurrentDictionary<string, NpgsqlDataSource> Pools { get; } = new();
internal static void Clear(string connString)
{
// TODO: Actually remove the pools from here, #3387 (but be careful of concurrency)
if (Pools.TryGetValue(connString, out var pool))
pool.Clear();
}
internal static void ClearAll()
{
// TODO: Actually remove the pools from here, #3387 (but be careful of concurrency)
foreach (var pool in Pools.Values)
pool.Clear();
}
static PoolManager()
{
// When the appdomain gets unloaded (e.g. web app redeployment) attempt to nicely
// close idle connectors to prevent errors in PostgreSQL logs (#491).
AppDomain.CurrentDomain.DomainUnload += (_, _) => ClearAll();
AppDomain.CurrentDomain.ProcessExit += (_, _) => ClearAll();
}
/// <summary>
/// Resets the pool manager to its initial state, for test purposes only.
/// Assumes that no other threads are accessing the pool.
/// </summary>
internal static void Reset()
{
// TODO: Remove once #3387 is implemented
ClearAll();
Pools.Clear();
}
}
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