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Thread safe collections.

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This commit is contained in:
Burak Kaan Köse
2025-10-31 19:53:31 +01:00
parent 600d1b7d38
commit f06273aa77
1 changed files with 29 additions and 24 deletions
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Wino.Mail.ViewModels/Collections/WinoMailCollection.cs
+22 -17
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@@ -1,4 +1,5 @@
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
@@ -21,16 +22,16 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
// If the item provider here for update or removal doesn't exist here
// we can ignore the operation.
public HashSet<Guid> MailCopyIdHashSet = [];
public ConcurrentDictionary<Guid, bool> MailCopyIdHashSet = [];
// Cache ThreadIds to quickly find items that should be threaded together
private readonly Dictionary<string, List<IMailListItem>> _threadIdToItemsMap = new();
private readonly ConcurrentDictionary<string, List<IMailListItem>> _threadIdToItemsMap = new();
// Cache item to group mapping for faster lookups
private readonly Dictionary<IMailListItem, ObservableGroup<object, IMailListItem>> _itemToGroupMap = new();
private readonly ConcurrentDictionary<IMailListItem, ObservableGroup<object, IMailListItem>> _itemToGroupMap = new();
// Cache uniqueId to MailItemViewModel for faster GetMailItemContainer lookups
private readonly Dictionary<Guid, MailItemViewModel> _uniqueIdToMailItemMap = new();
private readonly ConcurrentDictionary<Guid, MailItemViewModel> _uniqueIdToMailItemMap = new();
public event EventHandler<MailItemViewModel> MailItemRemoved;
public event EventHandler ItemSelectionChanged;
@@ -112,18 +113,21 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
{
if (isAdd)
{
MailCopyIdHashSet.Add(item);
// Update the uniqueId to MailItemViewModel cache
if (itemContainer is MailItemViewModel mailItemVM)
if (MailCopyIdHashSet.TryAdd(item, true))
{
_uniqueIdToMailItemMap[item] = mailItemVM;
// Update the uniqueId to MailItemViewModel cache
if (itemContainer is MailItemViewModel mailItemVM)
{
_uniqueIdToMailItemMap[item] = mailItemVM;
}
}
}
else
{
MailCopyIdHashSet.Remove(item);
_uniqueIdToMailItemMap.Remove(item);
if (MailCopyIdHashSet.TryRemove(item, out _))
{
_uniqueIdToMailItemMap.TryRemove(item, out _);
}
}
}
}
@@ -138,6 +142,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
if (isAdd)
{
// TODO: Sometimes the key is not present in the dict.
if (!_threadIdToItemsMap.ContainsKey(threadId))
{
_threadIdToItemsMap[threadId] = new List<IMailListItem>();
@@ -151,7 +156,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
_threadIdToItemsMap[threadId].Remove(item);
if (_threadIdToItemsMap[threadId].Count == 0)
{
_threadIdToItemsMap.Remove(threadId);
_threadIdToItemsMap.TryRemove(threadId, out _);
}
}
}
@@ -237,7 +242,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
group.Remove(mailItem);
// Remove from item-to-group cache
_itemToGroupMap.Remove(mailItem);
_itemToGroupMap.TryRemove(mailItem, out _);
if (group.Count == 0)
{
@@ -325,7 +330,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
public async Task AddAsync(MailCopy addedItem)
{
// First check if this is an update to an existing item
if (MailCopyIdHashSet.Contains(addedItem.UniqueId))
if (MailCopyIdHashSet.ContainsKey(addedItem.UniqueId))
{
// Find and update the existing item
var existingItemContainer = GetMailItemContainer(addedItem.UniqueId);
@@ -442,7 +447,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
continue;
// Check if this is an update to an existing item
if (MailCopyIdHashSet.Contains(item.MailCopy.UniqueId))
if (MailCopyIdHashSet.ContainsKey(item.MailCopy.UniqueId))
{
var existingItemContainer = GetMailItemContainer(item.MailCopy.UniqueId);
if (existingItemContainer?.ItemViewModel != null)
@@ -668,7 +673,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
public Task UpdateMailCopy(MailCopy updatedMailCopy)
{
// This item doesn't exist in the list.
if (!MailCopyIdHashSet.Contains(updatedMailCopy.UniqueId)) return Task.CompletedTask;
if (!MailCopyIdHashSet.ContainsKey(updatedMailCopy.UniqueId)) return Task.CompletedTask;
return ExecuteUIThread(() =>
{
@@ -761,7 +766,7 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
public async Task RemoveAsync(MailCopy removeItem)
{
// This item doesn't exist in the list.
if (!MailCopyIdHashSet.Contains(removeItem.UniqueId)) return;
if (!MailCopyIdHashSet.ContainsKey(removeItem.UniqueId)) return;
// Check all items for whether this item should be threaded with them.
bool shouldExit = false;