Gridgo Boot Dependency Injection

Gridgo Boot supports a simple built-in DI mechanism. First you create a class annotated with one of the following: @Component, @Gateway, @DataAccessObject. Then that class will be available to be injected into other classes using @ComponentInject, @GatewayInject and @DataAccessInject, respectively.

Examples:

1. Inject a @Component class:

@Component
class Foo {

}

Now inject Foo to other classes. Only classes annotated with @Component or @Gateway can be injected into

@Component
class Bar {

    @ComponentInject
    private Foo foo;
}

@Gateway("a_gateway")
@Connect("a_connector")
class SomeProcessor implements Processor {

    @ComponentInject
    private Foo foo;
}

2. Inject a @Gateway producer class

@Gateway("foo_gateway")
@Connect("a_connector_with_producer")
class SomeProducer {
}

Now inject the producer to another class. Only classes annotated with @Component or @Gateway can be injected into

@Gateway("bar_gateway")
@Connect("bar_connector")
class SomeProducer implements Processor {

    @GatewayInject("foo_gateway")
    private Gateway foo;
}

You may notice that in case of @GatewayInject, we need to specify the gateway name, and use io.gridgo.core.Gateway for the injected property instead of the actual gateway class. This is because it doesn’t make any sense, since the class is usually an empty class anyway.

3. Inject a @DataAccessObject class