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Create a typed state schema

Source: R/state.R
state_schema.Rd

Defines fields and their types/reducers for graph state. Field specs are strings: "logical", "numeric", "character", "list", "any", or "append:list" for append reducer.

Usage

state_schema(..., .max_append = Inf)

Arguments

...

Named field specifications (e.g., messages = "append:list", done = "logical").

.max_append

Maximum number of items to retain for append reducers. Defaults to Inf (no limit). When the limit is exceeded, only the most recent items are kept.

Value

A StateSchema R6 object.

See also

Other graph-building: END, graph_builder()

Examples

schema <- state_schema(messages = "append:list", done = "logical")
schema$validate(list(done = TRUE))
schema$merge(list(messages = list("a")), list(messages = list("b")))
#> $messages
#> $messages[[1]]
#> [1] "a"
#> 
#> $messages[[2]]
#> [1] "b"
#> 
#>