# Functions
ConfigConcurrency 配置并发执行任务数.
ConfigDeadline 配置任务最大期限秒数.
ConfigFailureRetention 配置任务失败后状态保留秒数.
ConfigHandler 配置任务处理方法.
ConfigPriorities 优先级配置.
ConfigRetention 配置任务完成后状态保留秒数.
ConfigRetryMax 配置最大重试次数.
ConfigTaskDelaySecond 配置任务延时执行秒数.
ConfigTaskPriority 配置任务优先级.
ConfigTaskProcessAt 配置任务计划开始执行时间戳（秒级）.
ConfigTimeout 配置任务处理超时秒数.
GetDefaultPriorities 默认优先级队列配置，从高到低遍历.
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# Constants
默认并发执行任务数.
默认任务失败后状态保留秒数.
默认任务完成后状态保留秒数.
默认任务处理超时秒数.
队列优先级.
队列优先级.
队列优先级.
任务ID列表分隔符.
任务类型.
任务类型.
# Structs
AsyncQueue 异步队列结构体.
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DAG 有向无环图.
TaskInfo 任务信息.
TaskMessage is the internal representation of a task with additional metadata fields.
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Vertex 顶点.
# Interfaces
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# Type aliases
HandlerFunc 队列处理方法，返回nil表示成功，返回非nil时失败不再重试，如需重试通过 TaskInfo.RetryDelay 设置并返回nil.
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