/// <summary>
/// 订阅
/// </summary>
/// <param name="subscribeAppName">消费者名称</param>
public void Subscribe(String subscribeAppName)
{
SubscribeAppName = subscribeAppName;
_Cts = new CancellationTokenSource();
if (_Redis == null || _Queue == null)
{
OnDisconnected("订阅时列队对像为Null。");
}
//尝试创建消费组
try
{
_Queue.Group = subscribeAppName;
_Queue.GroupCreate(subscribeAppName);
}
catch (Exception err)
{
//遇到其它非消费组名已经存在的错误消息时，停止消费并提示消息
if (err.Message.IndexOf(ConsumeGroupExistErrMsgKeyWord) < 0)
{
if (XTrace.Debug)
{
XTrace.WriteException(err);
}
OnStopSubscribe(err.Message);
return;
}
}
Task.Run(() => getSubscribe(subscribeAppName), _Cts.Token);
}
/// <summary>
/// 订阅
/// </summary>
/// <param name="subscribeAppName">消费者名称</param>
public void Subscribe(string subscribeAppName)
{
_Cts = new CancellationTokenSource();
_Queue.Group = subscribeAppName;
//尝试创建消费组
try
{
_Queue.GroupCreate(subscribeAppName);
}
catch (Exception err)
{
//遇到其它非消费组名已经存在的错误消息时，停止消费并提示消息
if (err.Message.IndexOf(ConsumeGroupExistErrMsgKeyWord) < 0)
{
if (XTrace.Debug)
{
XTrace.WriteException(err); //TODO:要优化处理日志的记录（此处日志调试用，实际生产环境不记录）
}
OnStopSubscribe(err.Message);
return;
}
}
#if NET40
var thread = new Thread(s => getSubscribe(subscribeAppName));
thread.Start();
#else
Task.Run(() => getSubscribe(subscribeAppName), _Cts.Token);
#endif
}
/// <summary>队列消费大循环，处理消息后自动确认</summary>
/// <typeparam name="T">消息类型</typeparam>
/// <param name="queue">队列</param>
/// <param name="onMessage">消息处理。如果处理消息时抛出异常，消息将延迟后回到队列</param>
/// <param name="cancellationToken">取消令牌</param>
/// <param name="log">日志对象</param>
/// <returns></returns>
public static async Task ConsumeAsync <T>(this RedisStream <String> queue, Func <T, Message, CancellationToken, Task> onMessage, CancellationToken cancellationToken = default, ILog log = null)
{
// 大循环之前，打断性能追踪调用链
DefaultSpan.Current = null;
// 自动创建消费组
var gis = queue.GetGroups();
if (gis == null || !queue.Group.IsNullOrEmpty() && !gis.Any(e => e.Name.EqualIgnoreCase(queue.Group)))
{
queue.GroupCreate(queue.Group);
}
// 主题
var topic = queue.Key;
if (topic.IsNullOrEmpty())
{
topic = queue.GetType().Name;
}
var rds = queue.Redis;
var tracer = rds.Tracer;
var errLog = log ?? XTrace.Log;
// 超时时间，用于阻塞等待
var timeout = rds.Timeout / 1000 - 1;
while (!cancellationToken.IsCancellationRequested)
{
Message mqMsg = null;
ISpan span = null;
try
{
// 异步阻塞消费
mqMsg = await queue.TakeMessageAsync(timeout, cancellationToken);
if (mqMsg != null)
{
// 埋点
span = tracer?.NewSpan($"redismq:{topic}", mqMsg);
log?.Info($"[{topic}]消息内容为：{mqMsg}");
var bodys = mqMsg.Body;
for (var i = 0; i < bodys.Length; i++)
{
if (bodys[i].EqualIgnoreCase("traceParent") && i + 1 < bodys.Length)
{
span.Detach(bodys[i + 1]);
}
}
// 解码
var msg = mqMsg.GetBody <T>();
// 处理消息
await onMessage(msg, mqMsg, cancellationToken);
// 确认消息
queue.Acknowledge(mqMsg.Id);
}
else
{
// 没有消息，歇一会
await Task.Delay(1000, cancellationToken);
}
}
catch (ThreadAbortException) { break; }
catch (ThreadInterruptedException) { break; }
catch (Exception ex)
{
span?.SetError(ex, null);
errLog?.Error("[{0}/{1}]消息处理异常：{2} {3}", topic, mqMsg?.Id, mqMsg?.ToJson(), ex);
}
finally
{
span?.Dispose();
}
}
}