SFDC Programming

SDLC (Software Development Life cycle)

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A Software development life cycle is composed of a number of clearly defined and distinct work phases which are used by Software engineers and Software developers to plan for, design, build, test, and deliver Software. Like anything that is developed on an assembly line, an SDLC aims to produce high-quality software that meet or exceed customer expectations, based on customer requirements, by delivering software which move through each clearly defined phase, within scheduled time frames and cost estimates.

The SDLC is not a methodology, but rather a description of the phases in the life cycle of a software application. These phases (speaking) are

  1. Requirement Gathering
  2. Analysis
  3. Design
  4. Coding (Development)
  5. Testing
  6. Implementatiion
  7. Maintenance / Services

Shashikant_sdlc-4-638

Requirement Gathering

In this Phase, Business Analyst will gather the all requirement from the client/customer and prepare Business requirement specification (BRS) or Customer requirement specification (CRS) or User Requirement Specification (URS). Senior business Analyst will prepare the System/Software requirement Specification (SRS) documents.

Rule for Successful requirement gathering

  1. Always Ask – don’t assume you know what user wants.
  2. Include the users from the starting.
  3. Define and agree on the scope of the project.
  4. Requirement should be SMART – specific, Measurable, Agree upon, Realistic and Time-based.
  5. Gain clarity if there is any doubt.
  1. Create clear user requirement document and share with the customer (play them back).
  1. Avoid talking about technology or solutions until the requirements are fully understood.
  2. Get the requirements agreed with the stakeholders before the project starts.
  3. Create a prototype model, if necessary, to confirm or refine the customer’s requirements.

Analysis

It is a method that allows the analyst to understand the system and its activities in a logical way. It is a systematic approach to analyse and refine the existing system and develop a new system specification which can be easily understandable by user.

Note: –The features and the functions that need to be put in the project are determined/analysed.

Design

It will be done by the very experienced person like Chief Architect or technical Team Leader or Architect.

Architect will have prepared the HLD (High Level design) and LLD (Low Level Design).

HLD: – High Level Design

  • List of modules and a brief description of each module.
  • Brief functionality of each module.
  • Interface relationship among modules
  • Database tables identified along with the key element.
  • Overall architecture diagrams along with technology details.

Example1.1: Data flow diagram for high level designshashikant_Dataflow

LLD: – Low Level Design

  • Detailed functional logic of the module.
  • Database table, with all elements, including their type and size.
  • All dependency issue Error Message Listings.
  • Complete input and Output for a module.

Example1.2: Data flow diagram for high level designShashikant_LowLevel

Development/Coding

Based on the HLD and LLD document, small modules are summed together and developed.

codingIMg

Testing

If testing is done correctly, it increases the overall software quality. This phase done by Test Engineers. Different types of testing performed by test engineers.

  • Functional Testing and Non-Functional Testing.
  • Black-Box Testing and White-Box Testing.
  • Static & Dynamic Testing
  • Unit testing
  • System testing
  • Performance Testing
  • Load Testing

Shashikant_Test

Implementation

Shashikant_Implemaintation

The Implementation phase is when the end user of your software is foremost in your mind. During this phase, you create the documentation and tools the customer uses to make informed decisions about how to deploy your software securely. To this end, the Implementation phase is when you establish development best practices to detect and remove security and privacy issues early in the development cycle.

Maintenance

Shashikant_maintenance

The Maintenance Phase occurs once the system is operational. It includes implementation of changes that software might undergo over a period of time, or implementation of new requirements after the software is deployed at the customer location. The maintenance phase also includes handling the residual errors that may exist in the software even after the testing phase. This phase also monitors system performance, rectifies bugs and requested changes are made.

A Maintenance, often turned support, is a crucial activity for linking the experiences of users/customers with the product delivery organization. We consider perspectives on high tech maintenance from bug fixing through to design focused activities.

Key Deliverables:

  • Keep system live
  • Maintain code
  • Update software when required

Sources: –

https://eternalsunshineoftheismind.wordpress.com/2013/03/10/sdlc-phase-5-maintenance/

https://www.projectsmart.co.uk/requirements-gathering.php

 

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APEX basic concept

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Apex ?

It is a Strongly typed Object-oriented programming language. It allows developers to execute flow and transaction control statements on the Force.com platform server in conjunction with calls to the Force.com​ API. Its Syntax looks like the Java and Database stored procedures.

 

  • Apex enables developers to add business logic to most system events including button clicks, related record updates, and Visualforce pages.
  • Apex allows developers to attach the business logic to the record save process.
  • It supports for unit test creation and execution.
  • Apex code can be initiated by Web service requests and from triggers on objects.
  • Apex is Integrated, Easy to use, Multitenant aware, automatically upgradable, easy to test, Hosted and Versioned.

Apex Architecture

Apex is compiled, stored, and run entirely on the Force.com platform

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When a developer writes and saves Apex code to the platform, the platform application server first compiles the code and saves in the form of metadata.

End users can send the request from the Visualforce pages(UI) and retrieve results from the salesforce servers.

Capabilities of Apex

  • Apex provided build in support for:
  • DML calls to insert, update and delete records.
  • Inline SOQL or SOSL statements for retrieving records.
  • Looping control structures that help with bulk processing.
  • A record locking syntax that prevents record update conflicts.
  • Custom public API calls.
  • Send and receive Emails.
  • Web services or XML request/response integrations.
  • Warning and Errors to prevent objects referenced by Apex from being notified.

7 Reasons to Choose APEX Programming Language for Your Next Salesforce based Application.

1   Quick access to Salesforce’s existing thousands of company’s users base and Salesforce Apps.

2   Ride on Salesforce’s cutting-edge existing functionality, including:

  • Administrative interface
  • User management and authentication
  • Reporting and analytics
  • Dynamic API
  • Toolkits and integrations for other languages and platforms

3   No worries about server maintenance or architecture as this is a PaaS platform

4   Security, both because of code review and because of high degree of control on the platform

5    Speed to learn the language as this is Java-like syntax, based on familiar Java idioms, such as variable and expression syntax, block and conditional statement syntax, loop syntax, object and array notation and much more, that speeds up the learning curve for new developers.

6    Native “Visualforce” elements allow fast and smooth information output

7    Connecting with one of the most active software development communities across the planet. Vast knowledge base with active participation from Salesforce staff.

What is Apex class and Triggers?

Apex class

It is a collection of variables and library of methods that can reused.

To define a class, specify the following:

  1. Access modifiers:
    • You must use one of the access modifiers (such as public or global) in the declaration of a top-level class.
    • You do not have to use an access modifier in the declaration of an inner class.
  2. Optional definition modifiers (such as virtual, abstract, and so on)
  3. Required: The keyword class followed by the name of the

Syntax:

private | public | global

[virtual | abstract | with sharing | without sharing]

class*** ClassName*** [implements InterfaceNameList] [extends ClassName]

{

// The body of the class

}

Apex Triggers

A trigger is Apex code that executes before or after the following types of operations:

  • insert
  • update
  • delete
  • merge
  • upsert
  • undelete

For example, you can have a trigger run before an object’s records are inserted into the database, after records have been deleted, or even after a record is restored from the Recycle Bin.

Syntax:

trigger ***TriggerName*** on ObjectName (trigger_events) {   code_block}