Rule Parameters

Topic

Author:

Fluent Commerce

Changed on:

28 Sept 2023

Overview

Rule Parameters, also known as properties or props, and the configuration time inputs to the Rule.

Rule Parameters should be considered always required. Optional inputs to a Rule should usually be managed via Event Attributes.

Rule Parameters

Author:

Fluent Commerce

Changed on:

28 Sept 2023

Overview

Rule Parameters, also known as properties or props, and the configuration time inputs to the Rule.

Rule Parameters should be considered always required. Optional inputs to a Rule should usually be managed via Event Attributes.

Key points

There are 4 Parameter types available to declare on Rules:
- String Parameters
- Integer Parameters
- Enum Parameters
- Time Period Parameters
Also, on this page, see how to implement Multi-value Parameters

String Parameters

The

`@ParamString`

Annotation defines a Parameter for the Rule of type

`String`

It contains 3 properties:

```
`name`
```
- the Name of the Parameter. This is Required.
```
`description`
```
- the Description of the Parameters. This is Required.
```
`defaultValue`
```
- this is the Default Value of the Parameter. This is Optional.

Property Name	Description	Required	Default Value
`name`	The name of the rule parameter. This becomes the key name used in the `props` construct of the Workflow JSON configuration.	Y
`description`	A helpful text describing the parameter. This is important meta data for use within the Workflow Builder UI and the Plugin GET API.	Y
`defaultValue`	A default value if the parameter is not set.	N

1@ParamString(name = "productCatalogueRef", description = "The reference to the Product Catalogue", defaultValue = "FCRG:PC:MASTER")

Language: java

Name: Here is an example declaration of @ParamString:

Description:

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Integer Parameters

The

`@ParamInteger`

Annotation defines a Parameter for the Rule of type

`Integer`

It contains 5 properties:

Property Name	Description	Required	Default Value
`name`	The name of the rule parameter. This becomes the key name used in the `props` construct of the Workflow JSON configuration.	Y
`description`	A helpful text describing the parameter. This is important meta data for use within the Workflow Builder UI and the Plugin GET API.	Y
`min`	The minimum value allowed to be entered for the rule parameter.	N	`Integer.MIN_VALUE`
`max`	The maximum value allowed to be entered for the rule parameter.	N	`Integer.MAX_VALUE`
`defaultValue`	A default value if the parameter is not set.	N	`Integer.MIN_VALUE`

1@ParamInteger(name = "ParamInt1", description = "Parameter Int 1", min = 0, max = 9, defaultValue = 0)

Language: java

Name: Here is an example declaration of @ParamInteger:

Description:

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Enum Parameters

The

`@ParamEnum`

Annotation defines a Parameter for the Rule of type

`Enum`

. This is useful for circumstances where only a specific set of values is acceptable as an input. There is however a downside though. If ever the list of parameter values needs to be changed or extended, it would require a code change, so use this only when this is not likely to be the case. If you need a list of parameter values for a Rule, but it needs to remain configurable at runtime, this can be achieved using Settings. See Multi-value Parameters for more information.

It contains 4 properties:

Property Name	Description	Required	Default Value
`name`	The name of the rule parameter. This becomes the key name used in the `props` construct of the Workflow JSON configuration.	Y
`description`	A helpful text describing the parameter. This is important meta data for use within the Workflow Builder UI and the Plugin GET API.	Y
`options`	This is the Enum class providing the available options to be selected.	Y
`defaultValue`	A default value if the parameter is not set.	N

1// Define an Enum use either in the same Java file as the Rule, or in a separate file within your Plugin Project:
2enum YesNoEnum {
3    YES, NO
4}
5
6@ParamEnum(name = "DoSomething", description = "Select YES or NO to doing something", options = YesNoEnum.class, defaultValue = YesNoEnum.YES)

Language: java

Name: Here is an example declaration of @ParamEnum:

Description:

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Time Period Parameters

The

`@ParamTimePeriod`

Annotation defines a Parameter for the Rule of type

`Integer`

signifying a duration in seconds.

It contains 5 properties:

Property Name	Description	Required	Default Value
`name`	The name of the rule parameter. This becomes the key name used in the `props` construct of the Workflow JSON configuration.	Y
`description`	A helpful text describing the parameter. This is important meta data for use within the Workflow Builder UI and the Plugin GET API.	Y
`min`	The minimum value allowed to be entered for the rule parameter.	N	`Integer.MIN_VALUE`
`max`	The maximum value allowed to be entered for the rule parameter.	N	`Integer.MAX_VALUE`
`defaultValue`	A default value if the parameter is not set.	N	`Integer.MIN_VALUE`

1@ParamTimePeriod(name = "delaySeconds", description = "Delay value in seconds", min = 0, max = 9, defaultValue = 5)

Language: java

Name: Here is an example declaration of @ParamTimePeriod:

Description:

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Multi-value Parameters

Rules can receive complex objects, such as Arrays or a JSON object, as Parameter inputs.

For example, you may need to receive an object containing a number of fields, or an array of Strings, Integers, or any other Objects.

Typically, we recommend using a standard String Parameter which receives a Setting name which references a Setting in the platform.

It is up to the Rule logic to handle the correct parsing of this complex type.

For example, let's say you want to provide a list of Virtual Catalogue References for querying Virtual Positions within the Rule. You could create a Rule Parameter for the Setting Name, such as

`acme.sourcing.multi-channel.catalogues`

, which expects a JSON value such as the following:

1{
2  "virtualCatalogueRefs": [
3    "VC:ATS:ECOMMERCE",
4    "VC:ATS:MARKETPLACE"
5  ]
6}

Language: json

Name: Example

Description:

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1@RuleInfo(name = "FulfilFromMultiSources", description = "Fulfils from any available positions in multiple Virtual Catalogues configured in setting {cataloguesSetting}")
2@ParamString(name = "cataloguesSetting", description = "The Setting name holding the list of Virtual Catalogue References to include in the search")
3public class FulfilFromMultiChannelSources implements Rule {
4    @Override
5    public <C extends Context> void run(C context) {
6        String cataloguesSetting = context.getProp("cataloguesSetting");
7
8        // Note: the `getSetting` method is not provided, but encapsulates querying the GraphQL Settings API.
9        Optional<VirtualCataloguesSetting> setting = getSetting(context, cataloguesSetting).as(VirtualCataloguesSetting.class);
10
11        if(setting.isPresent()) {
12            // Continue Sourcing...
13        } else {
14            // Note: the `logOnce` method is not provided, but encapsulates the `context.action().log()` action.
15            logOnce(context, VirtualCataloguesSetting.class, "No Catalogues config found at '%s'", cataloguesSetting);
16        }
17    }
18
19    @Data
20    @AllArgsConstructor
21    private static final class VirtualCataloguesSetting {
22        String[] virtualCatalogueRefs;
23    }
24}

Language: java

Name: The Rule could be implemented as follows:

Description:

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Rule Parameters

Overview

Rule Parameters

Overview

Key points

String Parameters

Integer Parameters

Enum Parameters

Time Period Parameters

Multi-value Parameters

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