Join Actor
The join actor merges multiple branches formed by a split task back into a
single path. The actor is configured to expect a specific number of arrivals of
records with the same record or tracking identifier. Once the expected number of
each arrive the exit link is followed. Options for how to form the outgoing JSON
record are also available with the box_resolve parameter.
The task follows the first or only link to the next task. No link label is
needed.
The JSON used to designate a join task in a flow description is:
"task-x": {
"actor": "join",
"trace": false,
"count": 2,
"box_resolve": "merge",
"links": {
"": "task-y"
}
}
Parameters the join expects are:
| count |
The number of arrivals with the same record identifier before
transitioning.
|
| box_resolve |
The stategy to use for resolving how the contents of the outgoing
record or box will be formed. Since the order of arrival can vary
care should be used to avoid unexpected results. Options are:
| merge |
Merge JSON object or arrays.
|
| first |
The outgoing record will be the first record received.
|
| last |
The outgoing record will be the last record received.
|
| all |
All records are placed in an array that becomes the record
for the outgoing record.
|
|
Piper Push Cache
