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Update SQLiteCache.cs

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ClemensFischer 2025-02-24 00:24:11 +01:00
parent c297338536
commit 904eb9c47a
1 changed files with 39 additions and 82 deletions
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121
Caches/SQLiteCache/SQLiteCache.cs
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@ -4,7 +4,6 @@
using Microsoft.Extensions.Caching.Distributed;
using System;
using System.Data.Common;
using System.Data.SQLite;
using System.Diagnostics;
using System.IO;
@ -75,12 +74,7 @@ namespace MapControl.Caching
{
using (var command = GetItemCommand(key))
{
var reader = command.ExecuteReader();
if (reader.Read() && !ReadValue(reader, ref value))
{
Remove(key);
}
value = (byte[])command.ExecuteScalar();
}
}
catch (Exception ex)
@ -101,12 +95,7 @@ namespace MapControl.Caching
{
using (var command = GetItemCommand(key))
{
var reader = await command.ExecuteReaderAsync(token);
if (await reader.ReadAsync(token) && !ReadValue(reader, ref value))
{
await RemoveAsync(key);
}
value = (byte[])await command.ExecuteScalarAsync();
}
}
catch (Exception ex)
@ -166,7 +155,7 @@ namespace MapControl.Caching
try
{
using (var command = RemoveItemCommand(key))
using (var command = DeleteItemCommand(key))
{
command.ExecuteNonQuery();
}
@ -183,7 +172,7 @@ namespace MapControl.Caching
try
{
using (var command = RemoveItemCommand(key))
using (var command = DeleteItemCommand(key))
{
await command.ExecuteNonQueryAsync();
}
@ -196,13 +185,7 @@ namespace MapControl.Caching
public void DeleteExpiredItems()
{
using (var command = new SQLiteCommand("delete from items where expiration < @exp", connection))
{
command.Parameters.AddWithValue("@exp", DateTimeOffset.UtcNow.Ticks);
command.ExecuteNonQuery();
}
#if DEBUG
using (var command = new SQLiteCommand("select changes()", connection))
using (var command = DeleteExpiredItemCommand())
{
var deleted = (long)command.ExecuteScalar();
if (deleted > 0)
@ -210,66 +193,6 @@ namespace MapControl.Caching
Debug.WriteLine($"{nameof(SQLiteCache)}: Deleted {deleted} expired items");
}
}
#endif
}
public async Task DeleteExpiredItemsAsync()
{
using (var command = new SQLiteCommand("delete from items where expiration < @exp", connection))
{
command.Parameters.AddWithValue("@exp", DateTimeOffset.UtcNow.Ticks);
await command.ExecuteNonQueryAsync();
}
#if DEBUG
using (var command = new SQLiteCommand("select changes()", connection))
{
var deleted = (long)await command.ExecuteScalarAsync();
if (deleted > 0)
{
Debug.WriteLine($"{nameof(SQLiteCache)}: Deleted {deleted} expired items");
}
}
#endif
}
private SQLiteCommand GetItemCommand(string key)
{
var command = new SQLiteCommand("select expiration, buffer from items where key = @key", connection);
command.Parameters.AddWithValue("@key", key);
return command;
}
private SQLiteCommand RemoveItemCommand(string key)
{
var command = new SQLiteCommand("delete from items where key = @key", connection);
command.Parameters.AddWithValue("@key", key);
return command;
}
private SQLiteCommand SetItemCommand(string key, byte[] buffer, DistributedCacheEntryOptions options)
{
var expiration = options.AbsoluteExpiration.HasValue
? options.AbsoluteExpiration.Value
: DateTimeOffset.UtcNow.Add(options.AbsoluteExpirationRelativeToNow ?? (options.SlidingExpiration ?? TimeSpan.FromDays(1)));
var command = new SQLiteCommand("insert or replace into items (key, expiration, buffer) values (@key, @exp, @buf)", connection);
command.Parameters.AddWithValue("@key", key);
command.Parameters.AddWithValue("@exp", expiration.Ticks);
command.Parameters.AddWithValue("@buf", buffer);
return command;
}
private static bool ReadValue(DbDataReader reader, ref byte[] value)
{
var expiration = new DateTimeOffset((long)reader["expiration"], TimeSpan.Zero);
if (expiration <= DateTimeOffset.UtcNow)
{
return false;
}
value = (byte[])reader["buffer"];
return true;
}
private static void CheckArgument(string key)
@ -294,5 +217,39 @@ namespace MapControl.Caching
throw new ArgumentNullException($"The {nameof(options)} argument must not be null.", nameof(options));
}
}
private SQLiteCommand GetItemCommand(string key)
{
var command = new SQLiteCommand("select buffer from items where key = @key and expiration > @now", connection);
command.Parameters.AddWithValue("@key", key);
command.Parameters.AddWithValue("@now", DateTimeOffset.UtcNow.Ticks);
return command;
}
private SQLiteCommand SetItemCommand(string key, byte[] buffer, DistributedCacheEntryOptions options)
{
var expiration = options.AbsoluteExpiration ??
DateTimeOffset.UtcNow.Add(options.AbsoluteExpirationRelativeToNow ?? options.SlidingExpiration ?? TimeSpan.FromDays(1));
var command = new SQLiteCommand("insert or replace into items (key, expiration, buffer) values (@key, @exp, @buf)", connection);
command.Parameters.AddWithValue("@key", key);
command.Parameters.AddWithValue("@exp", expiration.Ticks);
command.Parameters.AddWithValue("@buf", buffer);
return command;
}
private SQLiteCommand DeleteItemCommand(string key)
{
var command = new SQLiteCommand("delete from items where key = @key", connection);
command.Parameters.AddWithValue("@key", key);
return command;
}
private SQLiteCommand DeleteExpiredItemCommand()
{
var command = new SQLiteCommand("delete from items where expiration <= @now; select changes()", connection);
command.Parameters.AddWithValue("@now", DateTimeOffset.UtcNow.Ticks);
return command;
}
}
}