99 lines
2.7 KiB
C#
99 lines
2.7 KiB
C#
|
using FASTER.core;
|
|||
|
|
|
|||
|
|
// 定义数据结构
|
|||
|
|
public struct MyKey : IEquatable<MyKey>
|
|||
|
|
{
|
|||
|
|
public int Id;
|
|||
|
|
public bool Equals(MyKey other) => Id == other.Id;
|
|||
|
|
public override int GetHashCode() => Id.GetHashCode();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public struct MyValue
|
|||
|
|
{
|
|||
|
|
public byte[] Data;
|
|||
|
|
public DateTime Timestamp;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public struct MyInput
|
|||
|
|
{
|
|||
|
|
public byte[] NewData;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public struct MyOutput
|
|||
|
|
{
|
|||
|
|
public MyValue Value;
|
|||
|
|
public bool Updated;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
public struct MyContext
|
|||
|
|
{
|
|||
|
|
public string OperationId;
|
|||
|
|
public DateTime StartTime;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 实现自定义 Functions
|
|||
|
|
public class MyCustomFunctions : FunctionsBase<MyKey, MyValue, MyInput, MyOutput, MyContext>
|
|||
|
|
{
|
|||
|
|
// 读取完成回调
|
|||
|
|
public override void ReadCompletionCallback(ref MyKey key, ref MyInput input, ref MyOutput output, MyContext ctx, Status status, RecordMetadata recordMetadata)
|
|||
|
|
{
|
|||
|
|
base.ReadCompletionCallback(ref key, ref input, ref output, ctx, status, recordMetadata);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
//// 写入完成回调
|
|||
|
|
//public override void UpsertCompletionCallback(
|
|||
|
|
// ref MyKey key, ref MyValue value, MyContext ctx)
|
|||
|
|
//{
|
|||
|
|
// Console.WriteLine($"Upsert completed for key {key.Id}");
|
|||
|
|
//}
|
|||
|
|
|
|||
|
|
//// 删除完成回调
|
|||
|
|
//public override void DeleteCompletionCallback(
|
|||
|
|
// ref MyKey key, MyContext ctx)
|
|||
|
|
//{
|
|||
|
|
// Console.WriteLine($"Delete completed for key {key.Id}");
|
|||
|
|
//}
|
|||
|
|
|
|||
|
|
//// RMW (Read-Modify-Write) 操作 - 核心功能！
|
|||
|
|
//public override void RMWCompletionCallback(
|
|||
|
|
// ref MyKey key, ref MyInput input, ref MyOutput output,
|
|||
|
|
// MyContext ctx, Status status)
|
|||
|
|
//{
|
|||
|
|
// if (status == Status.OK)
|
|||
|
|
// {
|
|||
|
|
// Console.WriteLine($"RMW completed for key {key.Id}");
|
|||
|
|
// }
|
|||
|
|
//}
|
|||
|
|
|
|||
|
|
//// 并发控制：当多个线程同时修改相同键时调用
|
|||
|
|
//public override bool ConcurrentWriter(
|
|||
|
|
// ref MyKey key, ref MyValue value, ref MyValue newValue)
|
|||
|
|
//{
|
|||
|
|
// // 返回 true 表示接受新值，false 表示拒绝
|
|||
|
|
// return newValue.Timestamp > value.Timestamp;
|
|||
|
|
//}
|
|||
|
|
|
|||
|
|
//// 读取时复制：允许在读取时修改返回值
|
|||
|
|
//public override bool SingleReader(
|
|||
|
|
// ref MyKey key, ref MyInput input, ref MyValue value, ref MyOutput dst)
|
|||
|
|
//{
|
|||
|
|
// dst.Value = value;
|
|||
|
|
// dst.Updated = false;
|
|||
|
|
// return true;
|
|||
|
|
//}
|
|||
|
|
|
|||
|
|
//// 写入时处理：自定义写入逻辑
|
|||
|
|
//public override bool ConcurrentWriter(
|
|||
|
|
// ref MyKey key, ref MyValue value, ref MyValue newValue)
|
|||
|
|
//{
|
|||
|
|
// // 只有新数据的时间戳更晚时才更新
|
|||
|
|
// if (newValue.Timestamp > value.Timestamp)
|
|||
|
|
// {
|
|||
|
|
// value = newValue;
|
|||
|
|
// return true;
|
|||
|
|
// }
|
|||
|
|
// return false;
|
|||
|
|
//}
|
|||
|
|
}
|