本指南假定您已了解什么是双文本发送，您可以在以下内容中了解相关信息 双文本发送概念指南.

本指南涵盖 reject 双文本发送的选项，它通过抛出错误来拒绝图形的新运行，并继续执行原始运行直至完成。下面是使用 reject option.

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（如果使用 Python，可以跳过此步骤）：

    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);
    }
    

    # PLACE THIS IN A FILE CALLED pretty_print.sh
    pretty_print() {
      local type="$1"
      local content="$2"
      local padded=" $type "
      local total_width=80
      local sep_len=$(( (total_width - ${#padded}) / 2 ))
      local sep=$(printf '=%.0s' $(eval "echo {1.."${sep_len}"}"))
      local second_sep=$sep
      if (( (total_width - ${#padded}) % 2 )); then
        second_sep="${second_sep}="
      fi

      echo "${sep}${padded}${second_sep}"
      echo
      echo "$content"
    }
    

现在，让我们导入所需的包并实例化客户端、助手和线程。

    from langchain_core.messages import convert_to_messages
    from langgraph_sdk import get_client

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

    const client = new Client({ apiUrl:  });
    // Using the graph deployed with the name "agent"
    const assistantId = "agent";
    const thread = await client.threads.create();
    

    curl --request POST \
      --url /threads \
      --header 'Content-Type: application/json' \
      --data '{}'
    

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，由于我们已经启动了一个运行，这应该会失败：

    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)
    

    const run = await client.runs.create(
      thread["thread_id"],
      assistantId,
      input={"messages": [{"role": "user", "content": "what's the weather in sf?"}]},
    );

    try {
      await client.runs.create(
        thread["thread_id"],
        assistantId,
        {
          input: {"messages": [{"role": "user", "content": "what's the weather in nyc?"}]},
          multitask_strategy:"reject"
        },
      );
    } catch (e) {
      console.error("Failed to start concurrent run", e);
    }
    

    curl --request POST \
    --url <DEPLOY>/threads//runs \
    --header 'Content-Type: application/json' \
    --data "{
      \"assistant_id\": \"agent\",
      \"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what\'s the weather in sf?\"}]},
    }" && curl --request POST \
    --url <DEPLOY>/threads//runs \
    --header 'Content-Type: application/json' \
    --data "{
      \"assistant_id\": \"agent\",
      \"input\": {\"messages\": [{\"role\": \"human\", \"content\": \"what\'s the weather in nyc?\"}]},
      \"multitask_strategy\": \"reject\"
    }" || { echo "Failed to start concurrent run"; echo "Error: $?" >&2; }
    

Output:

Failed to start concurrent run Client error '409 Conflict' for url 'http://localhost:8123/threads/f9e7088b-8028-4e5c-88d2-9cc9a2870e50/runs'
For more information check: https://developer.mozilla.org/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：

    # 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()
    

    await client.runs.join(thread["thread_id"], run["run_id"]);

    const state = await client.threads.getState(thread["thread_id"]);

    for (const m of state["values"]["messages"]) {
      prettyPrint(m);
    }
    

    source pretty_print.sh && curl --request GET \
    --url /threads//runs//join && \
    curl --request GET --url /threads//state | \
    jq -c '.values.messages[]' | while read -r element; do
        type=$(echo "$element" | jq -r '.type')
        content=$(echo "$element" | jq -r '.content | if type == "array" then tostring else . end')
        pretty_print "$type" "$content"
    done
    

Output:

================================ 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

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.