using System.Collections.Concurrent;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using NewLife.Data;
using NewLife.Log;
using NewLife.Reflection;
using NewLife.Serialization;
using NewLife.Threading;
#if !NET40
using TaskEx = System.Threading.Tasks.Task;
#endif
//#nullable enable
namespace NewLife.Caching;
/// <summary>缓存键事件参数</summary>
public class KeyEventArgs : CancelEventArgs
{
/// <summary>缓存键</summary>
public String Key { get; set; } = null!;
}
/// <summary>默认字典缓存</summary>
public class MemoryCache : Cache
{
#region 属性
/// <summary>缓存核心</summary>
protected ConcurrentDictionary<String, CacheItem> _cache = new();
/// <summary>容量。容量超标时，采用LRU机制删除，默认100_000</summary>
public Int32 Capacity { get; set; } = 100_000;
/// <summary>定时清理时间，默认60秒</summary>
public Int32 Period { get; set; } = 60;
/// <summary>缓存键过期</summary>
public event EventHandler<KeyEventArgs>? KeyExpired;
#endregion
#region 静态默认实现
/// <summary>默认缓存</summary>
public static ICache Instance { get; set; } = new MemoryCache();
#endregion
#region 构造
/// <summary>实例化一个内存字典缓存</summary>
public MemoryCache()
{
Name = GetType().Name.TrimEnd("Cache");
Init(null);
}
/// <summary>销毁</summary>
/// <param name="disposing"></param>
protected override void Dispose(Boolean disposing)
{
base.Dispose(disposing);
_clearTimer.TryDispose();
_clearTimer = null;
}
#endregion
#region 缓存属性
private Int32 _count;
/// <summary>缓存项。原子计数</summary>
public override Int32 Count => _count;
/// <summary>所有键。实际返回只读列表新实例，数据量较大时注意性能</summary>
public override ICollection<String> Keys => _cache.Keys;
#endregion
#region 方法
/// <summary>初始化配置</summary>
/// <param name="config"></param>
public override void Init(String config)
{
if (_clearTimer == null)
{
var period = Period;
_clearTimer = new TimerX(RemoveNotAlive, null, 10 * 1000, period * 1000) { Async = true };
}
}
/// <summary>获取或添加缓存项</summary>
/// <typeparam name="T">值类型</typeparam>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <param name="expire">过期时间，秒</param>
/// <returns></returns>
public virtual T GetOrAdd<T>(String key, T value, Int32 expire = -1)
{
if (expire < 0) expire = Expire;
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null)
{
if (!item.Expired) return (T?)item.Visit();
item.Set(value, expire);
return value;
}
item ??= new CacheItem(value, expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return (T?)item.Visit();
}
#endregion
#region 基本操作
/// <summary>是否包含缓存项</summary>
/// <param name="key"></param>
/// <returns></returns>
public override Boolean ContainsKey(String key) => _cache.TryGetValue(key, out var item) && item != null && !item.Expired;
/// <summary>添加缓存项，已存在时更新</summary>
/// <typeparam name="T">值类型</typeparam>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <param name="expire">过期时间，秒</param>
/// <returns></returns>
public override Boolean Set<T>(String key, T value, Int32 expire = -1)
{
if (expire < 0) expire = Expire;
//_cache.AddOrUpdate(key,
// k => new CacheItem(value, expire),
// (k, item) =>
// {
// item.Value = value;
// item.ExpiredTime = DateTime.Now.AddSeconds(expire);
// return item;
// });
// 不用AddOrUpdate，避免匿名委托带来的GC损耗
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null)
{
item.Set(value, expire);
return true;
}
item ??= new CacheItem(value, expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return true;
}
/// <summary>获取缓存项，不存在时返回默认值</summary>
/// <param name="key">键</param>
/// <returns></returns>
[return: MaybeNull]
public override T Get<T>(String key)
{
if (!_cache.TryGetValue(key, out var item) || item == null || item.Expired) return default;
return item.Visit().ChangeType<T>();
}
/// <summary>批量移除缓存项</summary>
/// <param name="keys">键集合</param>
/// <returns>实际移除个数</returns>
public override Int32 Remove(params String[] keys)
{
var count = 0;
foreach (var k in keys)
{
if (_cache.TryRemove(k, out _))
{
count++;
Interlocked.Decrement(ref _count);
}
}
return count;
}
/// <summary>清空所有缓存项</summary>
public override void Clear()
{
_cache.Clear();
_count = 0;
}
/// <summary>设置缓存项有效期。已过期但未移除的键会重新激活</summary>
/// <param name="key">键</param>
/// <param name="expire">过期时间</param>
/// <returns>设置是否成功</returns>
public override Boolean SetExpire(String key, TimeSpan expire)
{
if (!_cache.TryGetValue(key, out var item) || item == null) return false;
item.Set(item.Value, expire);
return true;
}
/// <summary>获取缓存项有效期，不存在时返回Zero</summary>
/// <param name="key">键</param>
/// <returns></returns>
public override TimeSpan GetExpire(String key)
{
if (!_cache.TryGetValue(key, out var item) || item == null) return TimeSpan.Zero;
return TimeSpan.FromMilliseconds(item.ExpiredTime - Runtime.TickCount64);
}
#endregion
#region 高级操作
/// <summary>添加，已存在时不更新，常用于锁争夺</summary>
/// <typeparam name="T">值类型</typeparam>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <param name="expire">过期时间，秒</param>
/// <returns></returns>
public override Boolean Add<T>(String key, T value, Int32 expire = -1)
{
if (expire < 0) expire = Expire;
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null)
{
if (!item.Expired) return false;
item.Set(value, expire);
return true;
}
item ??= new CacheItem(value, expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return true;
}
/// <summary>设置新值并获取旧值，原子操作</summary>
/// <typeparam name="T">值类型</typeparam>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <returns></returns>
[return: MaybeNull]
public override T Replace<T>(String key, T value)
{
var expire = Expire;
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null)
{
var rs = item.Value;
// 如果已经过期，不要返回旧值
if (item.Expired) rs = default(T);
item.Set(value, expire);
return (T?)rs;
}
item ??= new CacheItem(value, expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return default;
}
/// <summary>尝试获取指定键，返回是否包含值。有可能缓存项刚好是默认值，或者只是反序列化失败</summary>
/// <remarks>
/// 在 MemoryCache 中，如果某个key过期，在清理之前仍然可以通过TryGet访问，并且更新访问时间，避免被清理。
/// </remarks>
/// <typeparam name="T">值类型</typeparam>
/// <param name="key">键</param>
/// <param name="value">值。即使有值也不一定能够返回，可能缓存项刚好是默认值，或者只是反序列化失败</param>
/// <returns>返回是否包含值，即使反序列化失败</returns>
public override Boolean TryGetValue<T>(String key, [MaybeNullWhen(false)] out T value)
{
value = default;
// 没有值，直接结束
if (!_cache.TryGetValue(key, out var item) || item == null) return false;
// 得到已有值
value = item.Visit().ChangeType<T>();
// 是否未过期的有效值
return !item.Expired;
}
/// <summary>获取 或 添加 缓存数据，在数据不存在时执行委托请求数据</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <param name="callback"></param>
/// <param name="expire">过期时间，秒。小于0时采用默认缓存时间<seealso cref="Cache.Expire"/></param>
/// <returns></returns>
[return: MaybeNull]
public override T GetOrAdd<T>(String key, Func<String, T> callback, Int32 expire = -1)
{
if (expire < 0) expire = Expire;
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null) return (T?)item.Visit();
item ??= new CacheItem(callback(key), expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return (T?)item.Visit();
}
/// <summary>累加，原子操作</summary>
/// <param name="key">键</param>
/// <param name="value">变化量</param>
/// <returns></returns>
public override Int64 Increment(String key, Int64 value)
{
var item = GetOrAddItem(key, k => 0L);
return item.Inc(value);
}
/// <summary>累加，原子操作</summary>
/// <param name="key">键</param>
/// <param name="value">变化量</param>
/// <returns></returns>
public override Double Increment(String key, Double value)
{
var item = GetOrAddItem(key, k => 0d);
return item.Inc(value);
}
/// <summary>递减，原子操作</summary>
/// <param name="key">键</param>
/// <param name="value">变化量</param>
/// <returns></returns>
public override Int64 Decrement(String key, Int64 value)
{
var item = GetOrAddItem(key, k => 0L);
return item.Dec(value);
}
/// <summary>递减，原子操作</summary>
/// <param name="key">键</param>
/// <param name="value">变化量</param>
/// <returns></returns>
public override Double Decrement(String key, Double value)
{
var item = GetOrAddItem(key, k => 0d);
return item.Dec(value);
}
#endregion
#region 集合操作
/// <summary>获取列表</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public override IList<T> GetList<T>(String key)
{
var item = GetOrAddItem(key, k => new List<T>());
return item.Visit() as IList<T> ??
throw new InvalidCastException($"无法将[{key}]的值从{item.Value?.GetType()}转为{typeof(IList<T>)}");
}
/// <summary>获取哈希</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public override IDictionary<String, T> GetDictionary<T>(String key)
{
var item = GetOrAddItem(key, k => new ConcurrentDictionary<String, T>());
return item.Visit() as IDictionary<String, T> ??
throw new InvalidCastException($"无法将[{key}]的值从{item.Value?.GetType()}转为{typeof(IDictionary<String, T>)}");
}
/// <summary>获取队列</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public override IProducerConsumer<T> GetQueue<T>(String key)
{
var item = GetOrAddItem(key, k => new MemoryQueue<T>());
return item.Visit() as IProducerConsumer<T> ??
throw new InvalidCastException($"无法将[{key}]的值从{item.Value?.GetType()}转为{typeof(IProducerConsumer<T>)}");
}
/// <summary>获取栈</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public override IProducerConsumer<T> GetStack<T>(String key)
{
var item = GetOrAddItem(key, k => new MemoryQueue<T>(new ConcurrentStack<T>()));
return item.Visit() as IProducerConsumer<T> ??
throw new InvalidCastException($"无法将[{key}]的值从{item.Value?.GetType()}转为{typeof(IProducerConsumer<T>)}");
}
/// <summary>获取Set</summary>
/// <remarks>基于HashSet，非线程安全</remarks>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public override ICollection<T> GetSet<T>(String key)
{
var item = GetOrAddItem(key, k => new HashSet<T>());
return item.Visit() as ICollection<T> ??
throw new InvalidCastException($"无法将[{key}]的值从{item.Value?.GetType()}转为{typeof(ICollection<T>)}");
}
/// <summary>获取 或 添加 缓存项</summary>
/// <param name="key"></param>
/// <param name="valueFactory"></param>
/// <returns></returns>
protected CacheItem GetOrAddItem(String key, Func<String, Object> valueFactory)
{
var expire = Expire;
CacheItem? item = null;
do
{
if (_cache.TryGetValue(key, out item) && item != null)
{
if (!item.Expired) return item;
item.Set(valueFactory(key), expire);
return item;
}
item ??= new CacheItem(valueFactory(key), expire);
} while (!_cache.TryAdd(key, item));
Interlocked.Increment(ref _count);
return item;
}
#endregion
#region 缓存项
/// <summary>缓存项</summary>
protected class CacheItem
{
private Object _Value;
/// <summary>数值</summary>
public Object Value { get => _Value; set => _Value = value; }
/// <summary>过期时间</summary>
public Int64 ExpiredTime { get; set; }
/// <summary>是否过期</summary>
public Boolean Expired => ExpiredTime <= Runtime.TickCount64;
/// <summary>访问时间</summary>
public Int64 VisitTime { get; private set; }
/// <summary>构造缓存项</summary>
/// <param name="value"></param>
/// <param name="expire"></param>
public CacheItem(Object value, Int32 expire) => Set(value, expire);
/// <summary>设置数值和过期时间</summary>
/// <param name="value"></param>
/// <param name="expire">过期时间，秒</param>
public void Set(Object value, Int32 expire)
{
Value = value;
var now = VisitTime = Runtime.TickCount64;
if (expire <= 0)
ExpiredTime = Int64.MaxValue;
else
ExpiredTime = now + expire * 1000L;
}
/// <summary>设置数值和过期时间</summary>
/// <param name="value"></param>
/// <param name="expire">过期时间，秒</param>
public void Set(Object? value, TimeSpan expire)
{
Value = value;
var now = VisitTime = Runtime.TickCount64;
if (expire == TimeSpan.Zero)
ExpiredTime = Int64.MaxValue;
else
ExpiredTime = now + (Int64)expire.TotalMilliseconds;
}
/// <summary>更新访问时间并返回数值</summary>
/// <returns></returns>
public Object Visit()
{
VisitTime = Runtime.TickCount64;
return Value;
}
/// <summary>递增</summary>
/// <param name="value"></param>
/// <returns></returns>
public Int64 Inc(Int64 value)
{
// 原子操作
Int64 newValue;
Object oldValue;
do
{
oldValue = _Value ?? 0;
newValue = oldValue.ToLong() + value.ToLong();
} while (Interlocked.CompareExchange(ref _Value, newValue, oldValue) != oldValue);
Visit();
return newValue;
}
/// <summary>递增</summary>
/// <param name="value"></param>
/// <returns></returns>
public Double Inc(Double value)
{
// 原子操作
Double newValue;
Object oldValue;
do
{
oldValue = _Value ?? 0;
newValue = oldValue.ToDouble() + value.ToDouble();
} while (Interlocked.CompareExchange(ref _Value, newValue, oldValue) != oldValue);
Visit();
return newValue;
}
/// <summary>递减</summary>
/// <param name="value"></param>
/// <returns></returns>
public Int64 Dec(Int64 value)
{
// 原子操作
Int64 newValue;
Object oldValue;
do
{
oldValue = _Value ?? 0;
newValue = oldValue.ToLong() - value.ToLong();
} while (Interlocked.CompareExchange(ref _Value, newValue, oldValue) != oldValue);
Visit();
return newValue;
}
/// <summary>递减</summary>
/// <param name="value"></param>
/// <returns></returns>
public Double Dec(Double value)
{
// 原子操作
Double newValue;
Object oldValue;
do
{
oldValue = _Value ?? 0;
newValue = oldValue.ToDouble() - value.ToDouble();
} while (Interlocked.CompareExchange(ref _Value, newValue, oldValue) != oldValue);
Visit();
return newValue;
}
}
#endregion
#region 清理过期缓存
/// <summary>清理会话计时器</summary>
private TimerX? _clearTimer;
/// <summary>移除过期的缓存项</summary>
private void RemoveNotAlive(Object state)
{
var tx = _clearTimer;
if (tx != null /*&& tx.Period == 60_000*/) tx.Period = Period * 1000;
var dic = _cache;
if (_count == 0 && !dic.Any()) return;
// 过期时间升序，用于缓存满以后删除
var slist = new SortedList<Int64, IList<String>>();
// 超出个数
var exceed = true;
if (Capacity <= 0 || _count <= Capacity) exceed = false;
// 60分钟之内过期的数据，进入LRU淘汰
var now = Runtime.TickCount64;
var exp = now + 3600_000;
var k = 0;
// 这里先计算，性能很重要
var toDels = new List<String>();
foreach (var item in dic)
{
// 已过期，准备删除
var ci = item.Value;
if (ci.ExpiredTime <= now)
toDels.Add(item.Key);
else
{
k++;
// 超出个数，且1小时内过期的数据，进入LRU淘汰
if (exceed && ci.ExpiredTime < exp)
{
if (!slist.TryGetValue(ci.VisitTime, out var ss))
slist.Add(ci.VisitTime, ss = []);
ss.Add(item.Key);
}
}
}
// 如果满了，删除前面
if (exceed && slist.Count > 0 && _count - toDels.Count > Capacity)
{
// 从lru列表中删除最先将要过期的数据
var over = _count - toDels.Count - Capacity;
for (var i = 0; i < slist.Count && over > 0; i++)
{
var ss = slist.Values[i];
if (ss != null && ss.Count > 0)
{
foreach (var item in ss)
{
if (over <= 0) break;
toDels.Add(item);
over--;
k--;
}
}
}
XTrace.WriteLine("[{0}]满，{1:n0}>{2:n0}，删除[{3:n0}]个", Name, _count, Capacity, toDels.Count);
}
// 确认删除
foreach (var item in toDels)
{
if (OnExpire(item))
_cache.Remove(item);
}
// 修正
_count = k;
}
/// <summary>缓存过期</summary>
/// <param name="key"></param>
protected virtual Boolean OnExpire(String key)
{
var e = new KeyEventArgs { Key = key, Cancel = false };
KeyExpired?.Invoke(this, e);
return !e.Cancel;
}
#endregion
#region 持久化
private const String MAGIC = "NewLifeCache";
private const Byte _Ver = 1;
/// <summary>保存到数据流</summary>
/// <param name="stream"></param>
/// <returns></returns>
public void Save(Stream stream)
{
var bn = new Binary
{
Stream = stream,
EncodeInt = true,
};
// 头部，幻数、版本和标记
bn.Write(MAGIC.GetBytes(), 0, MAGIC.Length);
bn.Write(_Ver);
bn.Write(0);
bn.WriteSize(_cache.Count);
foreach (var item in _cache)
{
var ci = item.Value;
// Key+Expire+Empty
// Key+Expire+TypeCode+Value
// Key+Expire+TypeCode+Type+Length+Value
bn.Write(item.Key);
bn.Write((Int32)(ci.ExpiredTime / 1000));
var type = ci.Value?.GetType();
if (type == null)
{
bn.Write((Byte)TypeCode.Empty);
}
else
{
var code = type.GetTypeCode();
bn.Write((Byte)code);
if (code != TypeCode.Object)
bn.Write(ci.Value);
else
{
bn.Write(type.FullName);
bn.Write(Binary.FastWrite(ci.Value));
}
}
}
}
/// <summary>从数据流加载</summary>
/// <param name="stream"></param>
/// <returns></returns>
public void Load(Stream stream)
{
var bn = new Binary
{
Stream = stream,
EncodeInt = true,
};
// 头部，幻数、版本和标记
var magic = bn.ReadBytes(MAGIC.Length).ToStr();
if (magic != MAGIC) throw new InvalidDataException();
var ver = bn.Read<Byte>();
_ = bn.Read<Byte>();
// 版本兼容
if (ver > _Ver) throw new InvalidDataException($"MemoryCache[ver={_Ver}]无法支持较新的版本[{ver}]");
var count = bn.ReadSize();
while (count-- > 0)
{
// Key+Expire+Empty
// Key+Expire+TypeCode+Value
// Key+Expire+TypeCode+Type+Length+Value
var key = bn.Read<String>();
var exp = bn.Read<Int32>();
var code = (TypeCode)bn.ReadByte();
Object value = null;
if (code == TypeCode.Empty)
{
}
else if (code != TypeCode.Object)
{
value = bn.Read(Type.GetType("System." + code));
}
else
{
var typeName = bn.Read<String>();
//var type = Type.GetType(typeName);
var type = typeName.GetTypeEx();
var pk = bn.Read<Packet>();
value = pk;
if (type != null)
{
var bn2 = new Binary() { Stream = pk.GetStream(), EncodeInt = true };
value = bn2.Read(type);
}
}
Set(key, value, exp - (Int32)(Runtime.TickCount64 / 1000));
}
}
/// <summary>保存到文件</summary>
/// <param name="file"></param>
/// <param name="compressed"></param>
/// <returns></returns>
public Int64 Save(String file, Boolean compressed) => file.AsFile().OpenWrite(compressed, s => Save(s));
/// <summary>从文件加载</summary>
/// <param name="file"></param>
/// <param name="compressed"></param>
/// <returns></returns>
public Int64 Load(String file, Boolean compressed) => file.AsFile().OpenRead(compressed, s => Load(s));
#endregion
#region 性能测试
/// <summary>使用指定线程测试指定次数</summary>
/// <param name="times">次数</param>
/// <param name="threads">线程</param>
/// <param name="rand">随机读写</param>
/// <param name="batch">批量操作</param>
public override Int64 BenchOne(Int64 times, Int32 threads, Boolean rand, Int32 batch)
{
if (rand)
times *= 100;
else
times *= 1000;
return base.BenchOne(times, threads, rand, batch);
}
#endregion
}
/// <summary>生产者消费者</summary>
/// <typeparam name="T"></typeparam>
public class MemoryQueue<T> : DisposeBase, IProducerConsumer<T>
{
private readonly IProducerConsumerCollection<T> _collection;
private readonly SemaphoreSlim _occupiedNodes;
/// <summary>实例化内存队列</summary>
public MemoryQueue()
{
_collection = new ConcurrentQueue<T>();
_occupiedNodes = new SemaphoreSlim(0);
}
/// <summary>实例化内存队列</summary>
/// <param name="collection"></param>
public MemoryQueue(IProducerConsumerCollection<T> collection)
{
_collection = collection;
_occupiedNodes = new SemaphoreSlim(collection.Count);
}
/// <summary>元素个数</summary>
public Int32 Count => _collection.Count;
/// <summary>集合是否为空</summary>
public Boolean IsEmpty
{
get
{
if (_collection is ConcurrentQueue<T> queue) return queue.IsEmpty;
if (_collection is ConcurrentStack<T> stack) return stack.IsEmpty;
//throw new NotSupportedException();
return _collection.Count == 0;
}
}
/// <summary>销毁</summary>
/// <param name="disposing"></param>
protected override void Dispose(Boolean disposing)
{
base.Dispose(disposing);
_occupiedNodes.TryDispose();
}
/// <summary>生产添加</summary>
/// <param name="values"></param>
/// <returns></returns>
public Int32 Add(params T[] values)
{
var count = 0;
foreach (var item in values)
{
if (_collection.TryAdd(item))
{
count++;
_occupiedNodes.Release();
}
}
return count;
}
/// <summary>消费获取</summary>
/// <param name="count"></param>
/// <returns></returns>
public IEnumerable<T> Take(Int32 count = 1)
{
if (count <= 0) yield break;
for (var i = 0; i < count; i++)
{
if (!_occupiedNodes.Wait(0)) break;
if (!_collection.TryTake(out var item)) break;
yield return item;
}
}
/// <summary>消费一个</summary>
/// <param name="timeout">超时。默认0秒，永久等待</param>
/// <returns></returns>
public T TakeOne(Int32 timeout = 0)
{
if (!_occupiedNodes.Wait(0))
{
if (timeout <= 0 || !_occupiedNodes.Wait(timeout * 1000)) return default;
}
return _collection.TryTake(out var item) ? item : default;
}
#if NET40
/// <summary>消费获取，同步阻塞</summary>
/// <param name="timeout">超时。默认0秒，永久等待</param>
/// <returns></returns>
public Task<T> TakeOneAsync(Int32 timeout = 0)
{
if (!_occupiedNodes.Wait(0))
{
if (timeout <= 0 || !_occupiedNodes.Wait(timeout * 1000)) return default;
}
var rs = _collection.TryTake(out var item) ? item : default;
return TaskEx.FromResult(rs);
}
/// <summary>消费获取，同步阻塞</summary>
/// <param name="timeout">超时。默认0秒，永久等待</param>
/// <param name="cancellationToken">取消通知</param>
/// <returns></returns>
public Task<T> TakeOneAsync(Int32 timeout, CancellationToken cancellationToken)
{
if (!_occupiedNodes.Wait(0))
{
if (timeout <= 0 || !_occupiedNodes.Wait(timeout * 1000, cancellationToken)) return default;
}
var rs = _collection.TryTake(out var item) ? item : default;
return TaskEx.FromResult(rs);
}
#else
/// <summary>消费获取，异步阻塞</summary>
/// <param name="timeout">超时。单位秒，0秒表示永久等待</param>
/// <returns></returns>
public async Task<T> TakeOneAsync(Int32 timeout = 0)
{
if (!_occupiedNodes.Wait(0))
{
if (timeout <= 0) return default;
if (!await _occupiedNodes.WaitAsync(timeout * 1000)) return default;
}
return _collection.TryTake(out var item) ? item : default;
}
/// <summary>消费获取，异步阻塞</summary>
/// <param name="timeout">超时。单位秒，0秒表示永久等待</param>
/// <param name="cancellationToken">取消令牌</param>
/// <returns></returns>
public async Task<T> TakeOneAsync(Int32 timeout, CancellationToken cancellationToken)
{
if (!_occupiedNodes.Wait(0, cancellationToken))
{
if (timeout <= 0) return default;
if (!await _occupiedNodes.WaitAsync(timeout * 1000, cancellationToken)) return default;
}
return _collection.TryTake(out var item) ? item : default;
}
#endif
/// <summary>确认消费</summary>
/// <param name="keys"></param>
/// <returns></returns>
public Int32 Acknowledge(params String[] keys) => 0;
}
//#nullable restore
|