当流中收到任何新消息时,应触发 OnMessageReceived 事件。
public event EventHandler<MqMessageReceivedEventArgs> OnMessageReceived;
var result = await redisDatabase.StreamRangeAsync(StreamName, "-", "+", 1, Order.Ascending);
protected virtual void OnMessageReceivedEvent(MqMessageReceivedEventArgs e)
{
OnMessageReceived?.Invoke(this, e);
}
根据官方文档,您必须执行以下操作:
定义传递函数:
public static class RedisHelper
{
Dictionary<string, string> ParseResult(StreamEntry entry) =>
entry.Values.ToDictionary(x => x.Name.ToString(), x => x.Value.ToString());
}
启动消费者任务:
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
var readTask = Task.Run(async () =>
{
while (!token.IsCancellationRequested)
{
var result = await db.StreamRangeAsync(streamName, "-", "+", 1, Order.Descending);
if (result.Any())
{
var dictionaries = result.Select(r => ParseResult(r)).ToList();
// or invoke event in loop
OnMessageReceivedEvent(new MqMessageReceivedEventArgs(dictionaries))
}
await Task.Delay(1000);
}
});
看起来您正在尝试调用/触发 OnMessageReceivedEvent,当调用此事件时,带有新消息的事件将在流中接收。假设逻辑已经实现并且它监听流中的消息。
public async Task ListenForMessages()
{
while (true)
{
var result = await redisDatabase.StreamRangeAsync(StreamName, "-", "+", 1, Order.Ascending);
if (result.Length > 0)
{
foreach (var message in result)
{
OnMessageReceived?.Invoke(this, new MqMessageReceivedEventArgs(message));
}
}
await Task.Delay(1000); // Delay before checking for new messages again
}
}
public class MqMessageReceivedEventArgs : EventArgs
{
public MqMessageReceivedEventArgs(StreamEntry message)
{
// Initialize any properties you want to pass along with the event
}
}