将实验性函数替换为并行步骤

Workflows 实验性函数 experimental.executions.map 会为每个对应的参数启动一个工作流执行，并等待所有执行完成，然后返回一个列表，其中每个元素都是一次执行的结果。

如果您使用 experimental.executions.map 来支持并行工作，则可以改为迁移工作流以使用并行步骤，并行执行普通的 for 循环。

parallel 步骤用于定义工作流的一部分，其中两个或更多步骤可以并发执行。parallel 步骤会等待其内定义的所有步骤完成或被未处理的异常中断；然后，执行会继续。与 experimental.executions.map 一样，无法保证执行顺序。如需了解详情，请参阅并行步骤的语法参考页面。

请注意，使用 experimental.executions.map 或 workflows.executions.run 需要额外的并发执行配额。不过，如果使用并行步骤并内嵌连接器调用（请参阅转换连接器示例），则无需额外的执行配额。

以下示例旨在帮助您将 experimental.executions.map 的使用替换为 parallel 步骤。

翻译工作流程

给定源语言和目标语言，以下名为 translate 的工作流会使用 Cloud Translation 连接器翻译一些输入文本并返回结果。请注意，必须启用 Cloud Translation API。

YAML

  main:
    params: [args]
    steps:
    - basic_translate:
        call: googleapis.translate.v2.translations.translate
        args:
          body:
            q: ${args.text}
            target: ${args.target}
            format: "text"
            source: ${args.source}
        result: r
    - return_step:
        return: ${r}

JSON

  {
    "main": {
      "params": [
        "args"
      ],
      "steps": [
        {
          "basic_translate": {
            "call": "googleapis.translate.v2.translations.translate",
            "args": {
              "body": {
                "q": "${args.text}",
                "target": "${args.target}",
                "format": "text",
                "source": "${args.source}"
              }
            },
            "result": "r"
          }
        },
        {
          "return_step": {
            "return": "${r}"
          }
        }
      ]
    }
  }

上述示例的输入：

{
  "text": "Bonjour",
  "target": "en",
  "source": "fr"
}

输出应类似于以下内容：

{
 "data": {
   "translations": [
     {
       "translatedText": "Hello"
     }
   ]
 }
}

使用 experimental.executions.map 的批量转换工作流

以下工作流会翻译一批文本。对于每个输入，experimental.executions.map 都会执行之前创建的 translate 工作流。

YAML

  main:
     steps:
     - init:
         assign:
         - workflow_id: "translate"
         - texts_to_translate:
             - text: "hello world!"
               source: "en"
               target: "fr"
             - text: "你好 世界！"
               source: "zh-CN"
               target: "en"
             - text: "No hablo español!"
               source: "es"
               target: "en"
     - translate_texts:
         call: experimental.executions.map
         args:
             workflow_id: ${workflow_id}
             arguments: ${texts_to_translate}
         result: translated
     - return:
             return: ${translated}

JSON

  {
    "main": {
      "steps": [
        {
          "init": {
            "assign": [
              {
                "workflow_id": "translate"
              },
              {
                "texts_to_translate": [
                  {
                    "text": "hello world!",
                    "source": "en",
                    "target": "fr"
                  },
                  {
                    "text": "你好 世界！",
                    "source": "zh-CN",
                    "target": "en"
                  },
                  {
                    "text": "No hablo español!",
                    "source": "es",
                    "target": "en"
                  }
                ]
              }
            ]
          }
        },
        {
          "translate_texts": {
            "call": "experimental.executions.map",
            "args": {
              "workflow_id": "${workflow_id}",
              "arguments": "${texts_to_translate}"
            },
            "result": "translated"
          }
        },
        {
          "return": {
            "return": "${translated}"
          }
        }
      ]
    }
  }

输出应类似于以下内容：

[
  {
    "data": {
      "translations": [
        {
          "translatedText": "Bonjour le monde!"
        }
      ]
    }
  },
  {
    "data": {
      "translations": [
        {
          "translatedText": "Hello world!"
        }
      ]
    }
  },
  {
    "data": {
      "translations": [
        {
          "translatedText": "I don't speak Spanish!"
        }
      ]
    }
  }
]

将 experimental.executions.map 替换为 for:in 循环

您可以使用并行 for:in 循环来翻译文本，而无需使用实验性函数。在以下示例中，辅助工作流 translate 可以按原样使用，并且输出应保持不变。您还可以选择在并行分支中启动其他次要工作流执行。

共享变量 translated 用于存储结果，并填充空字符串以启用静态数组编制索引。如果不需要排序，您可以使用 list.concat 附加结果。并行步骤中的所有赋值都是原子赋值。

YAML

main:
  params: []
  steps:
    - init:
        assign:
          - workflow_id: "translate"
          - texts_to_translate:
              - text: "hello world!"
                source: "en"
                target: "fr"
              - text: "你好 世界！"
                source: "zh-CN"
                target: "en"
              - text: "No hablo español!"
                source: "es"
                target: "en"
          - translated: ["", "", ""]  # to write to this variable, you must share it
    - parallel_translate:
        parallel:
          shared: [translated]
          for:
            in: ${texts_to_translate}
            index: i  # optional, use if index is required
            value: arg
            steps:
              - translate:
                  call: googleapis.workflowexecutions.v1.projects.locations.workflows.executions.run
                  args:
                    workflow_id: ${workflow_id}
                    argument: ${arg}
                  result: r
              - set_result:
                  assign:
                    - translated[i]: ${r}
    - return:
        return: ${translated}

JSON

{
  "main": {
    "params": [],
    "steps": [
      {
        "init": {
          "assign": [
            {
              "workflow_id": "translate"
            },
            {
              "texts_to_translate": [
                {
                  "text": "hello world!",
                  "source": "en",
                  "target": "fr"
                },
                {
                  "text": "你好 世界！",
                  "source": "zh-CN",
                  "target": "en"
                },
                {
                  "text": "No hablo español!",
                  "source": "es",
                  "target": "en"
                }
              ]
            },
            {
              "translated": [
                "",
                "",
                ""
              ]
            }
          ]
        }
      },
      {
        "parallel_translate": {
          "parallel": {
            "shared": [
              "translated"
            ],
            "for": {
              "in": "${texts_to_translate}",
              "index": "i",
              "value": "arg",
              "steps": [
                {
                  "translate": {
                    "call": "googleapis.workflowexecutions.v1.projects.locations.workflows.executions.run",
                    "args": {
                      "workflow_id": "${workflow_id}",
                      "argument": "${arg}"
                    },
                    "result": "r"
                  }
                },
                {
                  "set_result": {
                    "assign": [
                      {
                        "translated[i]": "${r}"
                      }
                    ]
                  }
                }
              ]
            }
          }
        }
      },
      {
        "return": {
          "return": "${translated}"
        }
      }
    ]
  }
}

将 experimental.executions.map 替换为 for:range 循环

您可以使用并行 for:range 循环来翻译文本，而无需使用实验性函数。通过使用 for:range 循环，您可以指定迭代范围的开始和结束。输出应保持不变。

YAML

main:
  params: []
  steps:
    - init:
        assign:
          - workflow_id: "translate"
          - texts_to_translate:
              - text: "hello world!"
                source: "en"
                target: "fr"
              - text: "你好 世界！"
                source: "zh-CN"
                target: "en"
              - text: "No hablo español!"
                source: "es"
                target: "en"
          - translated: ["", "", ""]  # to write to this variable, you must share it
    - parallel_translate:
        parallel:
          shared: [translated]
          for:
            range: ${[0, len(texts_to_translate) - 1]}
            value: i
            steps:
              - translate:
                  call: googleapis.workflowexecutions.v1.projects.locations.workflows.executions.run
                  args:
                    workflow_id: ${workflow_id}
                    argument: ${texts_to_translate[i]}
                  result: r
              - set_result:
                  assign:
                    - translated[i]: ${r}
    - return:
        return: ${translated}

JSON

{
  "main": {
    "params": [],
    "steps": [
      {
        "init": {
          "assign": [
            {
              "workflow_id": "translate"
            },
            {
              "texts_to_translate": [
                {
                  "text": "hello world!",
                  "source": "en",
                  "target": "fr"
                },
                {
                  "text": "你好 世界！",
                  "source": "zh-CN",
                  "target": "en"
                },
                {
                  "text": "No hablo español!",
                  "source": "es",
                  "target": "en"
                }
              ]
            },
            {
              "translated": [
                "",
                "",
                ""
              ]
            }
          ]
        }
      },
      {
        "parallel_translate": {
          "parallel": {
            "shared": [
              "translated"
            ],
            "for": {
              "range": "${[0, len(texts_to_translate) - 1]}",
              "value": "i",
              "steps": [
                {
                  "translate": {
                    "call": "googleapis.workflowexecutions.v1.projects.locations.workflows.executions.run",
                    "args": {
                      "workflow_id": "${workflow_id}",
                      "argument": "${texts_to_translate[i]}"
                    },
                    "result": "r"
                  }
                },
                {
                  "set_result": {
                    "assign": [
                      {
                        "translated[i]": "${r}"
                      }
                    ]
                  }
                }
              ]
            }
          }
        }
      },
      {
        "return": {
          "return": "${translated}"
        }
      }
    ]
  }
}

内嵌工作流源代码

如果辅助工作流相对较短，您可能需要直接将其包含在主工作流中，以便于阅读。例如，在以下工作流中，translate 工作流的源代码已内嵌。

YAML

main:
  params: [args]
  steps:
    - init:
        assign:
          - workflow_id: "translate"
          - texts_to_translate:
              - text: "hello world!"
                source: "en"
                target: "fr"
              - text: "你好 世界！"
                source: "zh-CN"
                target: "en"
              - text: "No hablo español!"
                source: "es"
                target: "en"
          - translated: ["", "", ""]
    - parallel_translate:
        parallel:
          shared: [translated]  # to write to this variable, you must share it
          for:
            range: ${[0, len(texts_to_translate) - 1]}
            value: i
            steps:
              - basic_translate:
                  call: googleapis.translate.v2.translations.translate
                  args:
                    body:
                      q: ${args.text}
                      target: ${args.target}
                      format: "text"
                      source: ${args.source}
                  result: r
              - set_result:
                  assign:
                    - translated[i]: ${r}
    - return:
        return: ${translated}

JSON

{
  "main": {
    "params": [
      "args"
    ],
    "steps": [
      {
        "init": {
          "assign": [
            {
              "workflow_id": "translate"
            },
            {
              "texts_to_translate": [
                {
                  "text": "hello world!",
                  "source": "en",
                  "target": "fr"
                },
                {
                  "text": "你好 世界！",
                  "source": "zh-CN",
                  "target": "en"
                },
                {
                  "text": "No hablo español!",
                  "source": "es",
                  "target": "en"
                }
              ]
            },
            {
              "translated": [
                "",
                "",
                ""
              ]
            }
          ]
        }
      },
      {
        "parallel_translate": {
          "parallel": {
            "shared": [
              "translated"
            ],
            "for": {
              "range": "${[0, len(texts_to_translate) - 1]}",
              "value": "i",
              "steps": [
                {
                  "basic_translate": {
                    "call": "googleapis.translate.v2.translations.translate",
                    "args": {
                      "body": {
                        "q": "${args.text}",
                        "target": "${args.target}",
                        "format": "text",
                        "source": "${args.source}"
                      }
                    },
                    "result": "r"
                  }
                },
                {
                  "set_result": {
                    "assign": [
                      {
                        "translated[i]": "${r}"
                      }
                    ]
                  }
                }
              ]
            }
          }
        }
      },
      {
        "return": {
          "return": "${translated}"
        }
      }
    ]
  }
}

后续步骤