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Guide to contribute to the Stream Chat Java SDK

Requirements

To contribute to this project, you need to have Lombok installed in your IDE. You also need to use javac >= 11 to compile (ensure that your JAVA_HOME points to such a location), even if the produced library is compatible with Java 8 (for some reasons, jdk 8 compiler fails on some Lombok annotations).

Setup the project

The project is a Maven project. For convenience, Eclipse files are provided in the repository, but it should be straightfoward to install in any other Java IDE.

Architecture explanation

The code is composed of:

Model classes

They are the data objects. They correspond to the formats of the objects contained in the API responses.

Request classes

They are builders for API requests, and also contain methods to perform the calls.

RequestData and RequestObject classes

They are data objects. They correspond to the formats of the API requests.

Response classes

They are data objects. They correspond to the formats of the API responses.

Service interfaces

They are Retrofit service interfaces, that describe the API endpoints.

The StreamServiceGenerator class

This class is responsible to make the Service interfaces usable to call the API. It is used by all Request classes to define the generateCall method. It also handles authentication and logging.

The StreamResponse interface and related classes

StreamResponse is the interface that correspond to an API response. Most APIs responses are StreamResponseObject (mean they contain duration and rate limit data).

The StreamRequest and StreamServiceHandler classes

StreamRequest is the generic Request class, that defines the request and requestAsync methods, which call the StreamServiceHandler. The StreamServiceHandler class defines the synchronous and asynchronous processing. It also enriched the Response object with rate limit data when available.

Test classes

They are organized by model. Each endpoint has at least one test related.

Code rules

  • The code should be formatted using Google formatter.
  • All attributes, parameters and return values should be annotated with either @Nullable or @NotNull
  • New implementations should follow the same principles as the existing ones (see how to section below)
  • In Models, collections of submodel should be List (other collections and arrays are not supported by RequestObjectBuilder)
  • String that only can take a given set of values should be represented as enums, with an UNKNOWN value marked @JsonEnumDefaultValue to avoid problem if the list of possible values changes

How to

Enable logging

Logging is enabled by default in tests. If you want to create a main class and activate logging, you should do the following:

StreamServiceGenerator.logLevel = HttpLoggingInterceptor.Level.BODY;

Add a new endpoint with request body schema or json query parameter

Create the Model and Service

  • If they already exist, skip this section
  • Model class should have @Data @NoArgsConstructor

Create the RequestObject classes

  • They should be created in the model, after other RequestObject classes
  • All fields should be @Nullable
  • Collection fields should be @Singular
  • These classes should have a @Builder
  • If there is a corresponding Model object, they should have a buildFrom method and @Setter

Create the xxxResponse class

  • It should be created in the model, after other Response classes
  • All fields should have @JsonProperty("xxx")
  • The xxxResponse class should extend StreamResponseObject and have @Data @NoArgsConstructor @EqualsAndHashCode(callSuper = true) (or implement StreamResponseWithRateLimitand have @Data @NoArgsConstructor if the response is directly a model object)

Create the xxxRequestData class

  • It should be created in the model, after other RequestData/Request classes
  • All fields should be @Nullable except collections that should be never be null which should have @Singular (which will make builder initialize them)

Create the xxxRequest

  • It should be created inside the xxxRequestData class
  • The xxxRequestData class should define this class as a Builder @Builder(builderClassName = "xxxRequest", builderMethodName = "", buildMethodName = "internalBuild").

Add the endpoint path variables to the xxxRequest class

  • They should be @NotNull attributes
  • The xxxRequest class should have a private constructor with all of them

Add the request creation method

  • It should be added at the end of the model
  • It should be static
  • It should have the same parameters as the xxxRequest constructor
  • It should be documented with Javadoc

Add the service method

  • It should be added at the end of the service class
  • It should have the same name as the method in the model to build the xxxRequest
  • All parameters should be marked with @Body or @Query or @Path. You can use the @ToJson annotation if you need the object to be transformed into a json String

Make the xxxRequest extend StreamRequest

You need to implement the generateCall method, calling the service using the StreamServiceGenerator

Update README.md (features and examples)

Add a new endpoint without request body schema or json query parameter

Create the Model and Service

  • If they already exist, skip this section
  • Model class should have @Data @NoArgsConstructor

Create the xxxResponse class

  • It should be created in the model, after other Response classes
  • All fields should have @JsonProperty("xxx")
  • The xxxResponse class should extend StreamResponseObject and have @Data @NoArgsConstructor @EqualsAndHashCode(callSuper = true) (or implement StreamResponseWithRateLimitand have @Data @NoArgsConstructor if the response is directly a model object)

Create the xxxRequest

  • It should be created in the model, after other RequestData/Request classes
  • Define the parameters as private attributes
  • The class should be annotated with @RequiredArgsConstructor
  • The class should have helper style methods for non required args

Add the request creation method

  • It should be added at the end of the model
  • It should be static
  • It should have the same parameters as the xxxRequest constructor
  • It should be documented with Javadoc

Add the service method

  • It should be added at the end of the service class
  • It should have the same name as the method in the model to build the xxxRequest
  • All parameters should be marked with @Query or @Path

Make the xxxRequest extend StreamRequest

You need to implement the generateCall method, calling the service using the StreamServiceGenerator

Update README.md (features and examples)

Add new fields to requests or responses

If you want to add new fields, just add the corresponding attributes in the Request, RequestData or Response class. That's all :)