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using System;
using System.Collections.Generic;
using System.Threading;
using OpenSim.Framework;
using OpenMetaverse;
namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Inventory
{
/// <summary>
/// Cache root and system inventory folders to reduce number of potentially remote inventory calls and associated holdups.
/// </summary>
public class InventoryCache
{
private const double CACHE_EXPIRATION_SECONDS = 3600.0; // 1 hour
private static ExpiringCache<UUID, InventoryFolderBase> m_RootFolders = new ExpiringCache<UUID, InventoryFolderBase>();
private static ExpiringCache<UUID, Dictionary<AssetType, InventoryFolderBase>> m_FolderTypes = new ExpiringCache<UUID, Dictionary<AssetType, InventoryFolderBase>>();
private static ExpiringCache<UUID, InventoryCollection> m_Inventories = new ExpiringCache<UUID, InventoryCollection>();
public void Cache(UUID userID, InventoryFolderBase root)
{
m_RootFolders.AddOrUpdate(userID, root, CACHE_EXPIRATION_SECONDS);
}
public InventoryFolderBase GetRootFolder(UUID userID)
{
InventoryFolderBase root = null;
if (m_RootFolders.TryGetValue(userID, out root))
return root;
return null;
}
public void Cache(UUID userID, AssetType type, InventoryFolderBase folder)
{
Dictionary<AssetType, InventoryFolderBase> ff = null;
if (!m_FolderTypes.TryGetValue(userID, out ff))
{
ff = new Dictionary<AssetType, InventoryFolderBase>();
m_FolderTypes.Add(userID, ff, CACHE_EXPIRATION_SECONDS);
}
// We need to lock here since two threads could potentially retrieve the same dictionary
// and try to add a folder for that type simultaneously. Dictionary<>.Add() is not described as thread-safe in the SDK
// even if the folders are identical.
lock (ff)
{
if (!ff.ContainsKey(type))
ff.Add(type, folder);
}
}
public InventoryFolderBase GetFolderForType(UUID userID, AssetType type)
{
Dictionary<AssetType, InventoryFolderBase> ff = null;
if (m_FolderTypes.TryGetValue(userID, out ff))
{
InventoryFolderBase f = null;
lock (ff)
{
if (ff.TryGetValue(type, out f))
return f;
}
}
return null;
}
public void Cache(UUID userID, InventoryCollection inv)
{
m_Inventories.AddOrUpdate(userID, inv, 120);
}
public InventoryCollection GetUserInventory(UUID userID)
{
InventoryCollection inv = null;
if (m_Inventories.TryGetValue(userID, out inv))
return inv;
return null;
}
public InventoryCollection GetFolderContent(UUID userID, UUID folderID)
{
InventoryCollection inv = null;
InventoryCollection c;
if (m_Inventories.TryGetValue(userID, out inv))
{
c = new InventoryCollection();
c.UserID = userID;
c.Folders = inv.Folders.FindAll(delegate(InventoryFolderBase f)
{
return f.ParentID == folderID;
});
c.Items = inv.Items.FindAll(delegate(InventoryItemBase i)
{
return i.Folder == folderID;
});
return c;
}
return null;
}
public List<InventoryItemBase> GetFolderItems(UUID userID, UUID folderID)
{
InventoryCollection inv = null;
if (m_Inventories.TryGetValue(userID, out inv))
{
List<InventoryItemBase> items = inv.Items.FindAll(delegate(InventoryItemBase i)
{
return i.Folder == folderID;
});
return items;
}
return null;
}
}
}
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