cta-flowcontrol

Flow Control Modules for Compass Test Automation, One of Libraries in CTA-OSS Framework

General Overview

cta-flowcontrol is one of the most important libraries in CTA-OSS Framework. It controls how the application operate.

Overview

There are 3 modules in this library.

Cement
CementHelper
Context

Guidelines

We aim to give you brief guidelines here.

Cement
CementHelper
Context
Examples

'use strict';

const FlowControl = require('cta-flowcontrol');

1. Cement

Cement aims to construct, initialize, and start bricks with tools using Cement's Constructor and Configuration.

1.1 Constructor

class Cement {
  constructor(configuration, basedir) {
    ...
  }
}

How to use it..

const Cement = FlowControl.Cement;
const config = require('./path/to/config');
const cement = new Cement(config);

When we use the new Cement(config), it will construct, initialize, and start bricks.

1.2 Configuration

const config = {
  name: string,
  bricks: array,
  tools: array,
  properties: object,
};

name defines the name of application
bricks provides the array of bricks, see example
tools provides the array of tools, see example
properties provides application's properties

// Example of Cement's Configuration
const b1 = require("brick1");
const b2 = require("brick2");
const b3 = require("brick3");

const t1 = require("tool1");
const t2 = require("tool2");
const t3 = require("tool3");

const config = {
  name: 'SampleApplication',
  bricks: [b1, b2, b3],
  tools: [t1, t2, t3],
  properties: {
    title: "sample title",
    url: "http://192.0.0.1:8081",
  },
};

2. CementHelper

CementHelper provides the supportive functionalities within the Brick.

2.1 require(path)

class SampleBrick extends Brick {
  process(context) {
    const sampleModule = this.cementHelper.require("sample-module");
    ...
  }
}

CementHelper's require() is equivalent to require(). It loads a module.

2.2 createContext(data, events)

class SampleBrick extends Brick {
  process(context) {
    const data = {
      nature: {
        type: 'type',
        quality: 'quality',
      },
      payload: { },
    };
    
    const otherContext = this.cementHelper.createContext(data, ['operate', 'error']);
    ...
  }
}

CementHelper's createContext() provides a functionality to create context by providing data and events.

data defines the provided data within context, see example
- nature consists of type and quality
- payload contains anything as payload
events provides the array of authorized events names that are used via context

2.3 publish(context)

class SampleBrick extends Brick {
  process(context) {
    ...
    this.cementHelper.publish(otherContext);
    ...
  }
}

CementHelper's publish() provides a functionality to publish context.

data defines the provided data within context
events provides the array of authorized events names that are used via context

3. Context

Context contains information about nature and payload.

3.1 publish()

class SampleBrick extends Brick {
  process(context) {
    const data = {
      nature: {
        type: 'type',
        quality: 'quality',
      },
      payload: { },
    };

    const otherContext = this.cementHelper.createContext(data, ['operate', 'error']);
    
    otherContext.publish(); // equivalent to this.cementHelper.publish(otherContext);
    ...
  }
}

Context's publish() is equivalent to CementHelper's publish(context). It publishes the context.

4. Examples

4.1 Brick Example

const brick = {
  name: 'sample brick',
  module: './lib/bricks/cta-sample-brick',
  properties: {},
  publish: [
    {
      topic: 'cta.execution',
      data: [
        {
          nature: {
            type: 'executions',
            quality: 'commandLine',
          },
        },
        {
          nature: {
            type: 'executions',
            quality: 'cancel',
          },
        },
      ],
    },
    {
      topic: 'cta.execution.result',
      data: [
        {
          nature: {
            type: 'results',
            quality: 'execute',
          },
        },
      ],
    },
    {
      topic: 'cta.execution.state',
      data: [
        {
          nature: {
            type: 'states',
            quality: 'create',
          },
        },
      ],
    },
  ],
  subscribe: [
    {
      topic: 'cta.execution',
      data: [
        {
          nature: {
            type: 'executions',
            quality: 'run',
          },
        },
        {
          nature: {
            type: 'executions',
            quality: 'cancel',
          },
        },
        {
          nature: {
            type: 'executions',
            quality: 'process',
          },
        },
      ],
    },
  ],
};

4.2 Tool Example

const tool = {
  name: 'logger',
  module: 'cta-logger',
  properties: {
    level: 'verbose',
  },
  scope: 'all',
  order: 1,
};

4.3 Data as Context Creation Example

const data = {
  nature: {
    type: 'executions',
    quality: 'commandLine',
  },
  payload: {
    executionId: execution.id,
  },
};

const otherContext = this.cementHelper.createContext(data, ['operate', 'error']);

thomsonreuters/cta-flowcontrol