Interface Summary
Interface	Description
Application<T extends Config>	Defines a CDAP Application.
ApplicationConfigurer	Configures a CDAP Application.
ApplicationContext<T extends Config>	Provides access to the environment, application configuration, and application (deployment) arguments.
ApplicationSpecification	Application Specification used in core code.
ApplicationUpdateContext	Context for updating Application configs.
AppStateStore	Saves and reads state for the given app.
RuntimeConfigurer	The runtime configurer that can be got when the app is reconfigured before the actual program run

Class Summary
Class	Description
AbstractApplication<T extends Config>	A support class for `Applications` which reduces repetition and results in a more readable configuration.
ApplicationUpdateResult<T extends Config>	Stores results of upgrading an application config.

Enum Summary
Enum Description

ApplicationConfigUpdateAction
Possible update actions for application config.

ProgramType
Defines types of programs supported by the system.

Enum Summary
Enum	Description
ApplicationConfigUpdateAction	Possible update actions for application config.
ProgramType	Defines types of programs supported by the system.

Package io.cdap.cdap.api.app Description

An Application is a logical grouping of Datasets and programs.

Application

Every Application must either implement the Application interface or extend the AbstractApplication class. Extending AbstractApplication is simpler and helps produce cleaner code.

To create a CDAP Application, first begin by extending the AbstractApplication class, then implement its configure() method. In the configure method, specify the Application's metadata (its name and description), and declare and configure each of the Application elements.

Example usage:

 
 public class MyApp extends AbstractApplication {
    @Override
   public void configure() {
     setName("myApp");
     setDescription("My Sample Application");
     createDataset("myCounters", "KeyValueTable");
     addSpark(new MySparkJob());
     addMapReduce(new MyMapReduceJob());
     addWorkflow(new MyAppWorkflow());
   }
 }

Dataset

A Dataset defines the storage and retrieval of data. In addition to the several Dataset implementations CDAP provides, you can also implement your own Custom Datasets.

See Dataset for details.

Spark

A Spark program defines the processing of data using Spark.

MapReduce

A MapReduce program to process in batch using MapReduce

Workflow

A Workflow program to orchestrate a series of mapreduce or spark jobs.