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本指南假设您了解什么是双重文本，您可以在双重文本概念指南中了解更多信息。 本指南涵盖了双重文本的reject选项，该选项通过抛出错误来拒绝图的新运行，并继续原始运行直到完成。下面是一个使用reject选项的快速示例。

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设置

首先，我们将定义一个快速辅助函数来打印 JS 和 CURL 模型输出（如果您使用 Python，可以跳过此步骤）
  • Javascript
  • CURL
function prettyPrint(m) {
  const padded = " " + m['type'] + " ";
  const sepLen = Math.floor((80 - padded.length) / 2);
  const sep = "=".repeat(sepLen);
  const secondSep = sep + (padded.length % 2 ? "=" : "");

  console.log(`${sep}${padded}${secondSep}`);
  console.log("\n\n");
  console.log(m.content);
}
现在，让我们导入所需的包并实例化客户端、助手和线程。
  • Python
  • Javascript
  • CURL
import httpx
from langchain_core.messages import convert_to_messages
from langgraph_sdk import get_client

client = get_client(url=<DEPLOYMENT_URL>)
# Using the graph deployed with the name "agent"
assistant_id = "agent"
thread = await client.threads.create()

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创建运行

现在我们可以运行一个线程并尝试使用“拒绝”选项运行第二个线程，这应该会失败，因为我们已经开始了运行。
  • Python
  • Javascript
  • CURL
run = await client.runs.create(
    thread["thread_id"],
    assistant_id,
    input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
)
try:
    await client.runs.create(
        thread["thread_id"],
        assistant_id,
        input={
            "messages": [{"role": "user", "content": "what's the weather in nyc?"}]
        },
        multitask_strategy="reject",
    )
except httpx.HTTPStatusError as e:
    print("Failed to start concurrent run", e)
输出 
Failed to start concurrent run Client error '409 Conflict' for url 'https://:8123/threads/f9e7088b-8028-4e5c-88d2-9cc9a2870e50/runs'
For more information check: https://mdn.org.cn/en-US/docs/Web/HTTP/Status/409

​
查看运行结果

我们可以验证原始线程已完成执行。
  • Python
  • Javascript
  • CURL
# wait until the original run completes
await client.runs.join(thread["thread_id"], run["run_id"])

state = await client.threads.get_state(thread["thread_id"])

for m in convert_to_messages(state["values"]["messages"]):
    m.pretty_print()
输出 
================================ Human Message =================================

what's the weather in sf?
================================== Ai Message ==================================

[{'id': 'toolu_01CyewEifV2Kmi7EFKHbMDr1', 'input': {'query': 'weather in san francisco'}, 'name': 'tavily_search_results_json', 'type': 'tool_use'}]
Tool Calls:
tavily_search_results_json (toolu_01CyewEifV2Kmi7EFKHbMDr1)
Call ID: toolu_01CyewEifV2Kmi7EFKHbMDr1
Args:
query: weather in san francisco
================================= Tool Message =================================
Name: tavily_search_results_json

[{"url": "https://www.accuweather.com/en/us/san-francisco/94103/june-weather/347629", "content": "Get the monthly weather forecast for San Francisco, CA, including daily high/low, historical averages, to help you plan ahead."}]
================================== Ai Message ==================================

According to the search results from Tavily, the current weather in San Francisco is:

The average high temperature in San Francisco in June is around 65°F (18°C), with average lows around 54°F (12°C). June tends to be one of the cooler and foggier months in San Francisco due to the marine layer of fog that often blankets the city during the summer months.

Some key points about the typical June weather in San Francisco:

* Mild temperatures with highs in the 60s F and lows in the 50s F
* Foggy mornings that often burn off to sunny afternoons
* Little to no rainfall, as June falls in the dry season
* Breezy conditions, with winds off the Pacific Ocean
* Layers are recommended for changing weather conditions

So in summary, you can expect mild, foggy mornings giving way to sunny but cool afternoons in San Francisco this time of year. The marine layer keeps temperatures moderate compared to other parts of California in June.
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