{
  "name": "cache.try-get",
  "description": "Returns a cached value by key if it exists, or creates a new cached item and returning it",
  "signature": {
    "input": {
      "kind": "cache-key",
      "description": "Cache key to retrieve",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "children": {
      "expiration": {
        "type": "long",
        "kind": "duration-seconds",
        "description": "Expiration in seconds for newly created value",
        "required": false,
        "mode": "ValueOrExpression",
        "cardinality": "ZeroOrOne",
        "default": "5",
        "role": "Option",
        "projection": "Value"
      },
      ".lambda": {
        "type": "lambda",
        "description": "Callback executed to create the cached value when the key is missing",
        "required": true,
        "mode": "ExecutableLambda",
        "cardinality": "ExactlyOne",
        "role": "Callback",
        "evaluation": "EvalBlock",
        "projection": "Value"
      }
    },
    "output": {
      "mode": "Value",
      "kind": "cache-value,text",
      "description": "Resolves to the cached value, or the newly created value when the key is missing"
    }
  }
}