Legend Showcase

The showcase is a collection of Legend models, example code that showcase various Legend features.

Basic Modeling

Demonstrates basic Legend modeling functionality (classes, attributes, derived properties, constraints, profile, super types)

• TODO : Legend Studio Project
• Unique constraint
• Express mutually exclusive classes via constraints
• Express Covariance via constraints
• Generic validations

Model To Model Mapping

Demonstrates the use of model to to model mapping.

• TODO : Legend Studio Project
• TODO : This should include mapping multiple source models to 1 target model
• TODO : Implicit/Auto Mapping (re-use mappings in other contexts)

Functions

Demonstrates how standard and user defined functions can be used in a model.

• TODO : Legend Studio Project

Relational Modeling And Query

Demonstrates the use of logical to relational mapping and the use of query tool.

• TODO : Legend Studio Project
• TODO : We can demonstrate only H2. Snowflake and other databases might be available in the FINOS instance.

Artifact Generation / JSON Schema

Demonstrates the generation of JSON schema from the Legend model

• TODO : Legend Studio Project
• TODO : Demonstrate how Legend constraints are converted into JSON schema constraints. Some examples here https://github.com/finos/legend-pure/blob/b35c0a0379245af23243baf398e2dea72a0bdf57/legend-pure-code-compiled-core/src/main/resources/core/json/tests/sharedSchema.pure

Artifact Generation / Avro

• TODO : Legend Studio Project
• TODO : Same as JSON Schema

FPML

• TODO : Legend Studio Project
• TODO : What are we trying to demo here ?

Legend APIs

Demonstrates usage of the REST APIs exposed by the different Legend components.

• TODO : This should document the gotcha with authentication
• TODO : This should document the use of Gitlab private access tokens

Model Import/Export

Demonstrates how models can be imported/exported into/from a Legend project.

Sourcing External Data

Demonstrates how external services can be invoked and used in a model.

• TODO : Not sure if this is fully supported in Legend.
• Enrich data attributes from multiple sources with functions
• RestAPI calls from functions to enrich/transform target data model

Legend Service Execution Jar

Demonstrates how Legend can be used to generate Java libraries that execute mappings and services.

• TODO : Legend Studio Project

Model Change Management

Demonstrates how Legend SDLC can be used to customize the Gitlab CI/CD experience. Also demonstrates how this integration can be used to enforce model constraints across Legend projects.

Project Dependencies

Demonstrates how to express dependencies between projects.

🚧 : This is being actively developed. Check Legend roadmap for details.

__ Group work space__

Demonstrates how multiple users can collaborate on a single model in a group project workspace.

🚧 : This is being actively developed. Check Legend roadmap for details.

__ Other__

• Sample service to retrieve model JSON
• Create executable JAR for consumption
• depend/consume open sourced data model
• Complex queries (e.g. milestoning)