# Lock & Unlock

## Lock & Unlock Actions

### TryLock

Tries creating a lock and returns whether it was successful:

{% tabs %}
{% tab title="Fields (table)" %}

| Field          | Definition                                      | Example    | Default |
| -------------- | ----------------------------------------------- | ---------- | ------- |
| Input Element  | Json path in payload that has id parameter      | parameters | -       |
| Output Element | Json path in payload to return "locked" results | result     | -       |
| {% endtab %}   |                                                 |            |         |

{% tab title="Fields (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "inputElement": {
          "type": "string",
          "description": "Json path in payload that has id parameter",
          "examples": ["parameters"],
          "default": null
        },
        "outputElement": {
          "type": "string",
          "description": "Json path in payload to return \"locked\" results",
          "examples": ["result"],
          "default": null
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

With the following event metadata parameters:

{% tabs %}
{% tab title="Parameters (table)" %}

| Parameter     | Definition                                                                                          | Example | Default |
| ------------- | --------------------------------------------------------------------------------------------------- | ------- | ------- |
| Master        | Whether master lock should be used instead of a specific id                                         | true    | false   |
| Timeout       | Milliseconds to wait for acquiring a lock, overrides default                                        | 2000    | -       |
| Expiry        | TTL in milliseconds for lock expiry, overrides default                                              | 10000   | -       |
| Allow No Lock | Whether failure to hold a lock should return a successful result, returns `locked` instead of error | true    | false   |
| {% endtab %}  |                                                                                                     |         |         |

{% tab title="Parameters (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "parameters": {
          "type": "object",
          "properties": {
            "master": {
              "type": "boolean",
              "description": "Whether master lock should be used instead of a specific id",
              "examples": [true],
              "default": false
            },
            "timeout": {
              "type": "integer",
              "description": "Milliseconds to wait for acquiring a lock (overrides default)",
              "examples": [2000],
              "default": null
            },
            "expiry": {
              "type": "integer",
              "description": "TTL in milliseconds for lock expiry (overrides default)",
              "examples": [10000],
              "default": null
            },
            "allowNoLock": {
              "type": "boolean",
              "description": "Whether failure to hold a lock should return a successful result (returns \"locked\" value instead of error)",
              "examples": [true],
              "default": false
            }
          }
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

### Unlock

Unlocks an existing lock:

{% tabs %}
{% tab title="Fields (table)" %}

| Field         | Definition                                 | Example    | Default |
| ------------- | ------------------------------------------ | ---------- | ------- |
| Input Element | Json path in payload that has id parameter | parameters | -       |
| {% endtab %}  |                                            |            |         |

{% tab title="Fields (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "inputElement": {
          "type": "string",
          "description": "Json path in payload that has id parameter",
          "examples": ["parameters"],
          "default": null
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

With the following event metadata parameters:

{% tabs %}
{% tab title="Parameters (table)" %}

| Parameter    | Definition                                                  | Example | Default |
| ------------ | ----------------------------------------------------------- | ------- | ------- |
| Master       | Whether master lock should be used instead of a specific id | true    | false   |
| {% endtab %} |                                                             |         |         |

{% tab title="Parameters (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "parameters": {
          "type": "object",
          "properties": {
            "master": {
              "type": "boolean",
              "description": "Whether master lock should be used instead of a specific id",
              "examples": [true],
              "default": false
            }
          }
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

### CheckLock

Returns the current status for a lock:

{% tabs %}
{% tab title="Fields (table)" %}

| Field          | Definition                                      | Example    | Default |
| -------------- | ----------------------------------------------- | ---------- | ------- |
| Input Element  | Json path in payload that has id parameter      | parameters | -       |
| Output Element | Json path in payload to return "locked" results | result     | -       |
| {% endtab %}   |                                                 |            |         |

{% tab title="Fields (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "inputElement": {
          "type": "string",
          "description": "Json path in payload that has id parameter",
          "examples": ["parameters"],
          "default": null
        },
        "outputElement": {
          "type": "string",
          "description": "Json path in payload to return \"locked\" results",
          "examples": ["result"],
          "default": null
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

With the following event metadata parameters:

{% tabs %}
{% tab title="Parameters (table)" %}

| Parameter    | Definition                                                  | Example | Default |
| ------------ | ----------------------------------------------------------- | ------- | ------- |
| Master       | Whether master lock should be used instead of a specific id | true    | false   |
| {% endtab %} |                                                             |         |         |

{% tab title="Parameters (JSON Schema)" %}

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "eventMeta": {
      "type": "object",
      "properties": {
        "parameters": {
          "type": "object",
          "properties": {
            "master": {
              "type": "boolean",
              "description": "Whether master lock should be used instead of a specific id",
              "examples": [true],
              "default": false
            }
          }
        }
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.rierino.com/devops/api-event-and-process-flows/configuring-saga-steps/event-step/flow-actions/lock-and-unlock.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.