[source,groovy]
----
abstract class BaseCountingService implements BuildService<CountingParams>, AutoCloseable {

}
----

A build service implementation is treated as a <<custom_gradle_types.adoc#custom_gradle_types,custom Gradle type>> and can use any of the features available to custom Gradle types.

A build service can optionally take parameters, which Gradle injects into the service instance when creating it.

The parameters must be represented using <<custom_gradle_types.adoc#managed_properties,managed properties>> and the parameters type must be a <<custom_gradle_types.adoc#managed_types,managed type>>.
You can use an interface or abstract class declaring the getters and Gradle will generate the implementation.

----

In the example above, a deployment task is created dynamically for every user-configured environment.

You can find out more about implementing project extensions in <<custom_gradle_types.adoc#custom_gradle_types,Developing Custom Gradle Types>>.

[[modeling_dsl_like_apis]]
== Modeling DSL-like APIs
DSLs exposed by plugins should be readable and easy to understand.

====

==== Next to the property declaration

You may configure a convention on a lazy property next to the place where the property is declared.
Note this option is not available for <<custom_gradle_types.adoc#managed_properties,managed properties>>, and has the same caveats as configuring a convention from the task constructor.

====