Skip to main content

Fork

oneTimeKeys

Commentary​

added in 0.7.10

By default, when a forked generator terminates, a new fork will respawn in its place. But when oneTimeKeys is set to true, any no new generators will respawn.

This desirable for use cases like abandoned shopping carts. If you have a forked generator that represents a shopping cart, you never want activity for an abandoned cart to resume.

Take care when using this parameter not to spawn an infinite number of forks. ShadowTraffic will track all previously used fork keys, and if you continue to spawn new ones, it will eventually run out of memory.

Examples​

Using a key only once​

When oneTimeKeys is set to true, the child topic will only ever receive 3 events: one for each id generated in the parent.

[
    {
        "topic": "parent",
        "value": {
            "_gen": "sequentialString",
            "expr": "id-~d"
        },
        "localConfigs": {
            "maxEvents": 3
        }
    },
    {
        "topic": "child",
        "fork": {
            "key": {
                "_gen": "lookup",
                "topic": "parent",
                "path": [
                    "value"
                ]
            },
            "oneTimeKeys": true
        },
        "value": {
            "_gen": "var",
            "var": "forkKey"
        },
        "localConfigs": {
            "maxEvents": 1
        }
    }
]

Specification​

JSON schema​

{
    "type": "boolean"
}