join component: Join node. Gather and merge the results of multiple asynchronous node executions. Example: Retrieve data from different databases or call APIs, then merge.

Configuration

Field	Type	Required	Description	Default
timeout	int	No	Execution timeout in seconds, 0: no timeout	0

Relation Type

• Success: Send the message to the Success chain.
• Failure: If execution times out or node execution fails, send to the Failure chain.

Execution Result

• metadata: Merge the metadata after each node is processed, and override if the same key exists.
• data: Encapsulate the message after each node is processed into an array of WrapperMsg. WrapperMsg:

Field	Type	Description	Default
msg	types.RuleMsg without merging metadata	Message conforms	None
err	string		""
nodeId	string	The last processing node	""

Configuration Example

{
  "ruleChain": {
    "id": "frcYgBtVbDaV",
    "name": "Test Merge Node",
    "debugMode": true,
    "root": true,
    "additionalInfo": {
      "createTime": "2024/09/24 16:56:52",
      "description": "",
      "layoutX": "280",
      "layoutY": "280",
      "updateTime": "2024/09/24 21:50:38",
      "username": "admin"
    }
  },
  "metadata": {
    "endpoints": [],
    "nodes": [
      {
        "id": "node_a",
        "additionalInfo": {
          "description": "",
          "layoutX": 490,
          "layoutY": 280
        },
        "type": "jsTransform",
        "name": "A",
        "debugMode": false,
        "configuration": {
          "jsScript": "msg.a=\"aa\"\nreturn {'msg':msg,'metadata':metadata,'msgType':msgType};"
        }
      },
      {
        "id": "node_b",
        "additionalInfo": {
          "description": "",
          "layoutX": 730,
          "layoutY": 210
        },
        "type": "jsTransform",
        "name": "B",
        "debugMode": false,
        "configuration": {
          "jsScript": "msg.b=\"bb\"\nreturn {'msg':msg,'metadata':metadata,'msgType':msgType};"
        }
      },
      {
        "id": "node_c",
        "additionalInfo": {
          "description": "",
          "layoutX": 730,
          "layoutY": 340
        },
        "type": "jsTransform",
        "name": "C",
        "debugMode": false,
        "configuration": {
          "jsScript": "msg.c=\"cc\"\nreturn {'msg':msg,'metadata':metadata,'msgType':msgType};"
        }
      },
      {
        "id": "node_d",
        "additionalInfo": {
          "description": "",
          "layoutX": 1010,
          "layoutY": 260
        },
        "type": "join",
        "name": "D",
        "debugMode": false,
        "configuration": {
          "timeout": 1
        }
      }
    ],
    "connections": [
      {
        "fromId": "node_a",
        "toId": "node_b",
        "type": "Success"
      },
      {
        "fromId": "node_a",
        "toId": "node_c",
        "type": "Success"
      },
      {
        "fromId": "node_b",
        "toId": "node_d",
        "type": "Success"
      },
      {
        "fromId": "node_c",
        "toId": "node_d",
        "type": "Success"
      }
    ]
  }
}