标签:uri dlx sub 报错 sock avl tor 分布式 pmi
Q:
如果集群多个客户端订阅会不会重复接收消息?
A:
集群环境用,有另外一个参数。
NodeManager类没有在框架里面:
public interface INodeManager : IGrainWithStringKey
{
/// <summary>
/// 初始化节点管理器
/// </summary>
/// <param name="nodeList"></param>
/// <returns></returns>
Task Init(List<string> nodeList);
/// <summary>
/// 获取一个节点名称作为当前节点的名称
/// </summary>
/// <returns></returns>
Task<string> GetNodeName();
/// <summary>
/// 保持节点活动状态(超时节点会被回收)
/// </summary>
/// <param name="nodeName"></param>
/// <returns>是否续活成功</returns>
Task<bool> KeepLive(string nodeName);
}
public class NodeManager : Orleans.Grain, INodeManager
{
List<string> nodeList;
Dictionary<string, DateTime> nodeUserDict = new Dictionary<string, DateTime>();
public Task Init(List<string> nodeList)
{
this.nodeList = nodeList;
return Task.CompletedTask;
}
public Task<string> GetNodeName()
{
foreach (var node in nodeList)
{
if (nodeUserDict.TryGetValue(node, out var liveTime))
{
if (DateTime.UtcNow.Subtract(liveTime).TotalSeconds <= 35)
continue;
else
{
nodeUserDict[node] = DateTime.UtcNow;
}
}
if (!nodeUserDict.ContainsKey(node))
{
nodeUserDict.Add(node, DateTime.UtcNow);
}
return Task.FromResult(node);
}
return Task.FromResult(string.Empty);
}
public Task<bool> KeepLive(string nodeName)
{
if (nodeUserDict.ContainsKey(nodeName))
{
if (nodeList.Contains(nodeName))
{
nodeUserDict[nodeName] = DateTime.UtcNow;
return Task.FromResult(true);
}
else
nodeUserDict.Remove(nodeName);
}
return Task.FromResult(false);
}
}
Q:
没太搞明白这个怎么用,也就是集群客户端订阅会重复消费吗?
A:
这个类似分布式锁,设置只能启动三个节点,每次启动先去获取一个NodeName,如果获取得到就能启动,获取不到重试几次还不行就直接报错
Q:
就是在订阅的时候,限制启动节点。
示例:
var socketNodeManager=GrainClient.GrainFactory.GetGrain<INodeManager>("coin_websocket");
var nodeList=new List<string>(){ "Coin","Coin1","Coin2"};
socketNodeManager.Init(nodeList).GetAwaiter().GetResult();
while(true)
{
var nodeName=socketNodeManager.GetNodeName().GetAwaiter().GetResult();
if(!string.IsNullOrEmpty(nodeName))
{
Task.Factory.StartNew(async ()=>{
while(true)
{
await Task.Delay(TimeSpan.FromSeconds(30));
if (!await socketNodeManager.KeepLive(nodeName))
{
await socketNodeManager.Init(nodeList);
}
}
});
SubscribeManage.Start(nodeName).GetAwaiter().GetResult();
//或:SubscribeManage.Start(nodeName, nodeList).GetAwaiter().GetResult();
break;
}else
{
Task.Delay(20).Wait();
}
}
标签:uri dlx sub 报错 sock avl tor 分布式 pmi
原文地址:https://www.cnblogs.com/CharlesZHENG/p/9290847.html