hybrid

hybrid

An intermediate GraphQL Java program where the schema is defined by a hybrid of the SDL file and programmatically in Java code.

Instructions

Follow these instructions to build and run the program.

1. Pre-requisite: Java 21
2. Build the program distribution:

   • ./gradlew :cli:installDist

3. Run the program:

   • cli/build/install/cli/bin/cli ' 
     {
       javaInfo(component: VERSION)
     }'

   • It should print something like this:

     23:24:52 [main] INFO dgroomes.graphql.GraphqlUtil - {javaInfo=The Java version is: 21.0.3}
     

4. Alias the build and run commands for happier development:

   • alias go="./gradlew :cli:installDist && cli/build/install/cli/bin/cli"

   • For example, try the following command to build and run the program in one short step.

   • go ' 
     {
       javaInfo(component: RUNTIME_MODE)
     }'

5. Try one of the dynamic Java components:

   • go '
     {
       javaInfo(component: PACKAGE_ORG_SLF4J)
     }'

   • It should print out all the classes in the org.slf4j package. The PACKAGE_ORG_SLF4J enum value was defined programmatically at runtime. In other words, PACKAGE_ORG_SLF4J is not defined in the SDL file schema.graphqls! The ability to define the GraphQL schema partly in a static SDL file and partly at runtime showcases GraphQL and graphql-java's flexibility. Pretty neat! The response will look something like the following.

   • 18:06:59 [main] INFO dgroomes.graphql.GraphqlUtil - {javaInfo=org.slf4j.ILoggerFactory
     org.slf4j.IMarkerFactory
     org.slf4j.Logger
     org.slf4j.LoggerFactory
     org.slf4j.MDC
     org.slf4j.MDC$MDCCloseable
     ... omitted...