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Example code of hyperf/dag

Informations about the package dag

hyperf/dag 是一个轻量级有向无环图 (Directed Acyclic Graph) 任务编排库。

场景

假设我们有一系列任务需要执行。

我们可以将第三种复杂的场景抽象成 DAG 来解决。

示例

假设我们有一系列任务，拓扑结构如上图所示，顶点代表任务，边缘代表依赖关系。(A完成后才能完成B、C、D，B完成后才能完成H、E、F...)

通过 hyperf/dag 可以使用如下方式构建 DAG 并执行。

输出：

DAG 会按照尽可能早的原则调度任务。尝试将 B 点的耗时调整为 2 秒，会发现 B 和 G 一起完成。

访问前步结果

每一个任务可以接收一个数组参数，数组中包含所有前置依赖的结果。DAG 执行完毕后，也会返回一个同样结构的数组，包含每一步的执行结果。

定义一个任务

在上述文档中，我们使用了闭包来定义一个任务。格式如下。

除了使用闭包函数定义任务外，还可以使用实现了 \Hyperf\Dag\Runner 接口的类来定义，并通过 Vertex::of 将其转化为一个顶点。

\Hyperf\Dag\Dag 本身也实现了 \Hyperf\Dag\Runner 接口，所以可以嵌套使用。

控制并发数

\Hyperf\Dag\Dag 类提供了 setConcurrency(int n) 方法控制最大并发数。默认为10。

All versions of dag with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
hyperf/support Version ~3.1.0
hyperf/utils Version ~3.1.0
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