Content Filter Pattern for REST Service Fields Filtering

At some point, you may have a service that returns a lot of fields and related objects. What if the service consumer doesn’t want all the fields all the time? In other words, he/she would like to have the response filtered. Here comes the** Content Filter** to the rescue. After you read this article you will find some ideas about how to use it in your own scenarios. So let’s roll.

Content Filter

This is the opposite pattern to Enrchier Pattern – more about it you can find here. In this particular scenario, we want to simplify our response. Remove unnecessary information that the receiver doesn’t need.

Content Filter pattern

As you can see in the diagram above, before filter we have a message with 3 elements and after the filter is applied we have only one element. The magic is happening in the black boxes called Content Filter. However, we as designers should know how this particular element works. So, how to define filter?

We may choose two ways of doing this:

  • **Positive **filter – we specify what we would like to have in the response
  • **Negative **filter – we specify what should be removed from the original payload

Filtering in Mule 4 Using DataWeave 2.2

In order to filter out some fields, we have DataWeave language. So for filtering purposes, we will use the Transform Message component. We can filter properties from objects and arrays. So let see how to do the positive and negative filtering in DW.

Negative Filtering

In DataWeave we have two operators – and –. The first one allows for removing a key-value pair by providing the key.

title property

_Remove the __title _property

Okay, that way I can remove one field at a time. In order to remove two fields like in the example above I would need to do it in the following way:

JavaScript

1

%dw 2.0

2

output application/json

3

---

4

{

5

    "id": "idy4234-2",

6

    "title": "Meetup"

7

} - "id" - "title"

The double dash operator (–) allows providing keys array. In other words, each key present in the array will be removed from the supplied object.

title and id

Remove both _title _ and id properties

In the example above we have provided an array with title and id keys. As a result of applying — operator, we got the empty object.

#integration #dataweave #integration pattern #content filter #negative filtering #rest

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Content Filter Pattern for REST Service Fields Filtering

Content Filter Pattern for REST Service Fields Filtering

At some point, you may have a service that returns a lot of fields and related objects. What if the service consumer doesn’t want all the fields all the time? In other words, he/she would like to have the response filtered. Here comes the** Content Filter** to the rescue. After you read this article you will find some ideas about how to use it in your own scenarios. So let’s roll.

Content Filter

This is the opposite pattern to Enrchier Pattern – more about it you can find here. In this particular scenario, we want to simplify our response. Remove unnecessary information that the receiver doesn’t need.

Content Filter pattern

As you can see in the diagram above, before filter we have a message with 3 elements and after the filter is applied we have only one element. The magic is happening in the black boxes called Content Filter. However, we as designers should know how this particular element works. So, how to define filter?

We may choose two ways of doing this:

  • **Positive **filter – we specify what we would like to have in the response
  • **Negative **filter – we specify what should be removed from the original payload

Filtering in Mule 4 Using DataWeave 2.2

In order to filter out some fields, we have DataWeave language. So for filtering purposes, we will use the Transform Message component. We can filter properties from objects and arrays. So let see how to do the positive and negative filtering in DW.

Negative Filtering

In DataWeave we have two operators – and –. The first one allows for removing a key-value pair by providing the key.

title property

_Remove the __title _property

Okay, that way I can remove one field at a time. In order to remove two fields like in the example above I would need to do it in the following way:

JavaScript

1

%dw 2.0

2

output application/json

3

---

4

{

5

    "id": "idy4234-2",

6

    "title": "Meetup"

7

} - "id" - "title"

The double dash operator (–) allows providing keys array. In other words, each key present in the array will be removed from the supplied object.

title and id

Remove both _title _ and id properties

In the example above we have provided an array with title and id keys. As a result of applying — operator, we got the empty object.

#integration #dataweave #integration pattern #content filter #negative filtering #rest

Cyril  Parisian

Cyril Parisian

1617806880

How to Consume WCF REST Service in C#

In this blog post, you will learn how to consume the WCF REST service in the C#  ASP.Net web application. Previously I have explained how to create WCF REST Service in C#  and Exception Handling in WCF using Fault Contract . You can follow the below steps to calling WCF rest service:-

#how to #wcf rest service #calling wcf rest service c# #consume wcf rest service c# json #consume wcf rest service c# xml

Wilford  Pagac

Wilford Pagac

1594289280

What is REST API? An Overview | Liquid Web

What is REST?

The REST acronym is defined as a “REpresentational State Transfer” and is designed to take advantage of existing HTTP protocols when used for Web APIs. It is very flexible in that it is not tied to resources or methods and has the ability to handle different calls and data formats. Because REST API is not constrained to an XML format like SOAP, it can return multiple other formats depending on what is needed. If a service adheres to this style, it is considered a “RESTful” application. REST allows components to access and manage functions within another application.

REST was initially defined in a dissertation by Roy Fielding’s twenty years ago. He proposed these standards as an alternative to SOAP (The Simple Object Access Protocol is a simple standard for accessing objects and exchanging structured messages within a distributed computing environment). REST (or RESTful) defines the general rules used to regulate the interactions between web apps utilizing the HTTP protocol for CRUD (create, retrieve, update, delete) operations.

What is an API?

An API (or Application Programming Interface) provides a method of interaction between two systems.

What is a RESTful API?

A RESTful API (or application program interface) uses HTTP requests to GET, PUT, POST, and DELETE data following the REST standards. This allows two pieces of software to communicate with each other. In essence, REST API is a set of remote calls using standard methods to return data in a specific format.

The systems that interact in this manner can be very different. Each app may use a unique programming language, operating system, database, etc. So, how do we create a system that can easily communicate and understand other apps?? This is where the Rest API is used as an interaction system.

When using a RESTful API, we should determine in advance what resources we want to expose to the outside world. Typically, the RESTful API service is implemented, keeping the following ideas in mind:

  • Format: There should be no restrictions on the data exchange format
  • Implementation: REST is based entirely on HTTP
  • Service Definition: Because REST is very flexible, API can be modified to ensure the application understands the request/response format.
  • The RESTful API focuses on resources and how efficiently you perform operations with it using HTTP.

The features of the REST API design style state:

  • Each entity must have a unique identifier.
  • Standard methods should be used to read and modify data.
  • It should provide support for different types of resources.
  • The interactions should be stateless.

For REST to fit this model, we must adhere to the following rules:

  • Client-Server Architecture: The interface is separate from the server-side data repository. This affords flexibility and the development of components independently of each other.
  • Detachment: The client connections are not stored on the server between requests.
  • Cacheability: It must be explicitly stated whether the client can store responses.
  • Multi-level: The API should work whether it interacts directly with a server or through an additional layer, like a load balancer.

#tutorials #api #application #application programming interface #crud #http #json #programming #protocols #representational state transfer #rest #rest api #rest api graphql #rest api json #rest api xml #restful #soap #xml #yaml

Alycia  Spinka

Alycia Spinka

1596015060

Content Filter Pattern for REST Service — Implementation

In the last article, you can find the idea of how to introduce field filtering for your APIs. My simplified Content Filter allows for providing negative or positive filtering. The first one tells which fields Filter removes from the target response. The latter one tells which fields should be available in the response. Today I show you how I have implemented this using DataWeave language.

Filterable DataWeave Module

Okay, our input is straightforward. The Content Filter has two input arguments, like in the diagram below

content filter

Input argument for the Content Filter.

Filter Parameter

As you remember, we should be able to do positive or negative filtering. We can filter many fields that are in a comma-separated form. In order to distinguish negative filtering, each field should have a minus prefix like -type. In the case of positive filtering, no prefix is required.

I have also introduced *all keyword as a default one to represent the idea of all fields. We can combine it with both filters. Below you can see two ways of removing single type property from the object:

Java

1

*all,-type

2

-type

#tutorial #integration #rest #mulesoft #dataweave #filter parameter

Salis  Ajingi

Salis Ajingi

1619846700

REST API & RESTful Web Services Explained | Web Services Tutorial

In this tutorial we will learn REST API and RESTful web services.

What is REST API? REST stands for Representational State Transfer and API stands for Application Programming Interface.

Representational - the resource (image, page, video, profile) is represented by the web server to the client in any format like HTML, Image, JSON, XML etc.

State - the state of the application (web site) on a client’s computer changes as the client clicks from one link to the next. Ask the client clicks on the link, they request additional resources, and the application “state” changes.

Transfer - the transfer of resources from the web server to the client in a “representational” state which can be read by the client or implemented in the application program by the programmer. The transfer may also refer to the application state transfer as the client browses a web site.

API - application programming interface provides useful methods/functions which a programmer can implement into his own application in a chosen programming language like PHP. The API makes it easy for programmers to implement. It’s important to note that the response we get when sending REST API request will usually be in JSON, XML or other format which makes it easy to implement in the code and it’s not meant to be read immediately by a human being.

Download this video’s files here:

https://www.patreon.com/posts/rest-ap…

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#rest #restful #web-service