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Federation"],"sub_categories":["Java","Code First"],"readme":"[![Continuous Integration](https://github.com/apollographql/federation-jvm/workflows/Continuous%20Integration/badge.svg)](https://github.com/apollographql/federation-jvm/actions?query=workflow%3A%22Continuous+Integration%22)\n[![MIT License](https://img.shields.io/github/license/apollographql/federation-jvm.svg)](LICENSE)\n[![Maven Central](https://img.shields.io/maven-central/v/com.apollographql.federation/federation-graphql-java-support.svg)](https://maven-badges.herokuapp.com/maven-central/com.apollographql.federation/federation-graphql-java-support)\n[![Join the community forum](https://img.shields.io/badge/join%20the%20community-forum-blueviolet)](https://community.apollographql.com)\n\n# Apollo Federation on the JVM\n\n[**Apollo Federation**](https://www.apollographql.com/docs/federation/) is a powerful, open architecture that helps you create a **unified supergraph** that combines multiple GraphQL APIs.\n`federation-graphql-java-support` provides Apollo Federation support for building subgraphs in the `graphql-java` ecosystem. Individual subgraphs can be run independently of each other but can also specify\nrelationships to the other subgraphs by using Federated directives. See [Apollo Federation documentation](https://www.apollographql.com/docs/federation/) for details.\n\n```mermaid\ngraph BT;\n  gateway([Supergraph\u003cbr/\u003egateway]);\n  serviceA[Users\u003cbr/\u003esubgraph];\n  serviceB[Products\u003cbr/\u003esubgraph];\n  serviceC[Reviews\u003cbr/\u003esubgraph];\n  gateway --- serviceA \u0026 serviceB \u0026 serviceC;\n```\n\n## Modules\n\n### Federation JVM Support\n\n`federation-graphql-java-support` is built on top of `graphql-java` and provides transformation logic to make your GraphQL schemas Federation compatible. `SchemaTransformer` adds common Federation\ntype definitions (e.g. `_Any` scalar, `_Entity` union, Federation directives, etc) and allows you to easily specify your Federated entity resolvers.\n\nThis project also provides a set of Federation aware instrumentations:\n\n* `CacheControlInstrumentation` - instrumentation that computes a max age for an operation based on `@cacheControl` directives\n* `FederatedTracingInstrumentation` - instrumentation that generates trace information for federated operations\n\nSee module [README](graphql-java-support/README.md) for details.\n\n### Subscription HTTP Callback Support for Spring GraphQL\n\nGraphQL subscriptions enable clients to receive continual, real-time updates whenever new data becomes available. Unlike\nqueries and mutations, subscriptions are long-lasting. This means a client can receive multiple updates from a single subscription.\n\n[Spring GraphQL](https://docs.spring.io/spring-graphql/reference/) provides out of box support for GraphQL subscriptions\nover WebSockets using [graphql-transport-ws](https://github.com/enisdenjo/graphql-ws) protocol. This library adds support\nfor subscriptions using [Apollo HTTP callback protocol](https://www.apollographql.com/docs/router/executing-operations/subscription-callback-protocol).\n\nSee [Apollo Router](https://www.apollographql.com/docs/router/executing-operations/subscription-support) for additional\ndetails about Federation and Subscription support. See module [README](spring-subscription-callback/README.md) for library\ndetails.\n\n## Contact\n\nIf you have a specific question about the library or code, please start a discussion in the [Apollo community forums](https://community.apollographql.com/).\n\n## Contributing\n\nTo get started, please fork the repo and checkout a new branch. You can then build the library locally with Gradle\n\n```shell\n./gradlew clean build\n```\n\nSee more info in [CONTRIBUTING.md](CONTRIBUTING.md).\n\nAfter you have your local branch set up, take a look at our open issues to see where you can contribute.\n\n## Security\n\nFor more info on how to contact the team for security issues, see our [Security Policy](https://github.com/apollographql/federation-jvm/security/policy).\n\n## License\n\nThis library is licensed under [The MIT License (MIT)](LICENSE).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fapollographql%2Ffederation-jvm","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fapollographql%2Ffederation-jvm","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fapollographql%2Ffederation-jvm/lists"}