redux-flow-manager

Flow Manager help you to manage flow information by determine the current step, next step and define the set of conditions that satisfy the steps.
Flow Manger using XState for state machine to calculate where are you currently in the flow and where you need to go.

Motivation

redux-flow-manager created to help you manage application with complex flows.
In the flow diagram below you can see example of one flow that can be in your application.
In that flow diagram, each color is sub flow, and green and red steps are start and end flow.
Redux Flow Manager help you to manage this sub flows and get decisions where you are and where you need to go.

Install

npm install --save redux-flow-manager

Usage

Check out the the example in the files app.ts and flowManger.browser.ts in the test folder.

Step 1: Add the flow manager reducer to your project.

import { combineReducers } from 'redux';
import { flowManagerReducer } from 'redux-flow-manager';

const rootReducer = combineReducers({
    flowManager: flowManagerReducer
});

...

Step 2: Create Steps Configuration file - steps config define the set of steps for each sub flow types. (config files properties are explained below. Steps Configuration

Step 3: Create Flows Configuration file - flow config file define the sub flow types name and the conditions that should be success to make this sub flow valid. (config files properties are explained below. Flows Configuration

Step 4: Call CreateFlowManagerAPI with your store, reducer slice name, flows configuration and steps configuration. ( more details of how configuration should be look like will explain later )

// ./index.js

import store from './store';
import CreateFlowManagerAPI from 'redux-flow-manager';

export default CreateFlowManagerAPI(store, 'flowManager', flowsConfig, stepsConfig);

Step 5: CreateFlowManagerAPI return an instance of Flow Manager with functionality that will help you manage flows in your app.

// ./SomeComponent.jsx

class App extends SomeComponent {
    // will set teh main flow type when clock on button
    render() {
        return (
            <button onClick={() => flowManagerAPI.startFlow('CHQ', true);}>
                Start CHQ Flow
            </button>
        );
    }
}

// ./OtherComponent


class App extends OtherComponent {
    // get the next step
    const nextStep = flowManagerAPI.getNextStep();

    render() {
        return (
            <button onClick={() => redirectToStep(nextStep)}>
                Move to Next Step
            </button>
        );
    }
}

Store Structure

interface FlowManagerState {
    flowType: string;
    subFlowTypes: Array<string>;
    currentStep: string;
    nextStep: string;
    steps: Array<string>;
}

Initial Flow Manager

CreateFlowManagerAPI(store, sliceName, flowsConfig, stepsConfig);

Create new instance of flow manager. All the API methods of flow manager describe below.

arguments:

Property	Type	Required	Default	Description
store	object	Required	undefined	Pass in the redux store.
sliceName	string	Required	undefined	the name of the reducer slice
flowsConfig	SubFlowsConfig	Required	undefined	Flows Configuration
stepsConfig	StepsConfig	Required	undefined	Steps Configuration

Start and End Flow

async startFlow(flowType, autoUpdate, currentStep)

Start flow is used when your app is init the main flow type in the store. That flow type represent a set of sub flow types in your Flows Configuration

arguments:

Property	Type	Required	Default	Description
flowType	string	Required	undefined	The flow type that represent a set of sub flow types Flows Configuration
currentStep	string	Required	undefined	Initial specific step by start the flow instead of the first step that define in steps array
autoUpdate	boolean	Optional	undefined	Optionally pass indicate to automatic run state machine calculator to calculate the flow information data for any change in store

endFlow()

End the flow. Clear all the data from flow manager.

arguments:

None

Steps Actions

async updateInformation()

Update Information running the state machine to calculate the sub flows condition and update the steps information and sub flows.

NOTE: If you call startFlow with autoUpdate true, this method invoke automatic for every change in store. This is very useful for auto calculation nd update your component automatic without worry when to call to updateInformation.

arguments:

None

nextStep(step?)

Next Step method update the current step with the next step and the next step with the new next step
return the next step value.

NOTE: To Promise last updated result, call to updateInformation before.

arguments:

Property	Type	Required	Default	Description
step	string	Optional	currentStep	Optional to pass the step move to. by default it move to the next step according to steps array.

isLastStep()

Return if the current step is the last step.

NOTE: To Promise last updated result, call to updateInformation before.

arguments:

None

Selectors

Each Selector return the corresponding value from the store.

NOTE is not recommended to use directly with selector.
Use Step Actions async methods to get the most updated result before navigate to next step for example.

• getFlowType()
• getSubFlowTypes()
• getCurrentStep()
• getSteps()
• getNextStep()

Flows Configuration

Flows Config is an array of object, that each object define the sub flow that may be in your entire application.
Each flow object have conditions array taht each condition include callback. that callback can check anything related to the condition, if the condition you check is success then return resolve, if the condition is failed then return reject.

If all conditions of a sub flow pass, then this sub flow added to the subFlowTypes array

Flow Object Properties:

• flowName: string - unique name of the sub flow type
• conditions: array - an array of Condition Object
• conditionName: string - the name of the condition
• onCheck: function - a promise function that return resolve when the condition success and reject if the condition should be failed
• mandatory: boolean - optional property. define if to remove that sub flow from the array if this condition failed. true by default.

NOTE The Order of the Flow Objects in the array are matter. The checks will run by that order.

const flowsConfig = [
    {
        flowName: 'planOnlyFlow',
        conditions: [
            {
                conditionName: 'conditionA',
                onCheck: conditionA
            },
            {
                conditionName: 'conditionB',
                onCheck: conditionB,
                mandatory: false
            }
        ]
    },
    {
        flowName: 'onlyAccessoryFlow',
        conditions: [
            {
                conditionName: 'conditionC',
                onCheck: conditionC
            },
            {
                conditionName: 'conditionD',
                onCheck: conditionD
            }
        ]
    },
    {
        flowName: 'changePlanFlow',
        conditions: [
            {
                conditionName: 'conditionA',
                onCheck: conditionA
            },
            {
                conditionName: 'conditionD',
                onCheck: conditionD
            }
        ]
    }
];

Steps Configuration

Steps configuration define for each flow and sub flow, the set of steps that the user need to complete in your application.

Step Object Properties:

• key: flowType (Example: COP) - the key represent the flowType
• key: subFlowType (Example: planOnlyFlow) - represent the subFlowType
• stesp: array - set of steps for this flowType and subFlowType

NOTE The Order of the Sub flow Objects in the object are matter. The checks will run by that order. For example: if you put planOnlyFlow before planOnlyFlow,changePlanFlow, then planOnlyFlow always wil be set before planOnlyFlow,changePlanFlow.

const stepsConfig = {
    COP: {
        onlyAccessoryFlow: {
            steps: [
                'STEP_A',
                'STEP_B',
                'STEP_C',
            ]
        }
    },
    CHQ: {
        'planOnlyFlow,changePlanFlow': {
            steps: [
                'STEP_R',
                'STEP_T',
                'STEP_X',
            ]
        },
        planOnlyFlow: {
            steps: [
                'STEP_B',
                'STEP_C',
                'STEP_D',
            ]
        },
        changePlanFlow: {
            steps: [
                'STEP_A',
                'STEP_D',
                'STEP_E',
            ]
        }
    }
};

XState

getMachineFlowConfig()

Return an XState config that can be set in XState visualizer to see your state machine created by your config.

arguments:

None

XState Visualizer