// Everything is up-to-date
    object Valid : CheckedFingerprint()

    // The entry cannot be reused at all and should be recreated from scratch
    class EntryInvalid(val reason: String) : CheckedFingerprint()

    // The entry can be reused, however the values for certain projects cannot be reused and should be recreated
    class ProjectsInvalid(val reason: String, val invalidProjects: Set<Path>) : CheckedFingerprint()

/**
 * @see ServiceScope
 */
public interface Scope {

    /**
     * These services are reused across builds in the same process.
     *
     * <p>Global services are visible to all other services.</p>
     */
    interface Global extends Scope {}

    /**
     * These services are reused across builds in the same process while the Gradle user home directory remains unchanged.

        failure.assertHasCause("Could not resolve all files for configuration ':compile'.")
        failure.assertThatCause(matchesRegexp(".*?Connect to 127.0.0.1:${port} (\\[.*\\])? failed: Connection refused.*"))

        when:
        server.resetExpectations()
        then:
        executer.withArgument("--offline")
        run 'retrieve'
        and:

 */
@ServiceScope(Scope.Global.class)
public interface GradleModuleServices extends ServiceRegistrationProvider {
    /**
     * Called once per process, to register any globally scoped services. These services are reused across builds in the same process.
     * The services are closed when the process finishes.
     *
     * <p>Global services are visible to all other services.</p>
     *
     * @see Scope.Global
     */

	}
}

// GetLease returns a lease based on requested ttl: if the cached previous
// lease can be reused, reuse it; otherwise request a new one from etcd.
func (l *leaseManager) GetLease(ctx context.Context, ttl int64) (clientv3.LeaseID, error) {
	now := time.Now()
	l.leaseMu.Lock()
	defer l.leaseMu.Unlock()
	// check if previous lease can be reused
	reuseDurationSeconds := l.getReuseDurationSecondsLocked(ttl)

                            println "implementation class is reused: ${first.getClass().is(second.getClass())}"
                        }
                    }
                }
            }

            apply type: RulePlugin
        '''

        then:
        succeeds "compareImplementationClasses"

        and:
        output.contains("implementation class is reused: true")
    }

     * <p>The Ivy instance of the calling thread is reused if the thread is already executing an action against an Ivy instance.
     */
    void withIvy(Action<? super Ivy> action);

    /**
     * Executes the given action against an Ivy instance and returns the result. Sets up the Ivy context before the action and cleans up at the end.
     *

        cleanWorkspace()
        execute("taskWithInputs")

        then:
        reused(":taskWithInputs")

        when:
        cleanWorkspace()
        file('foo/c').mkdir()
        file('foo/c/1').mkdir()
        file('foo/c/2').mkdir()
        execute("taskWithInputs")

        then:
        reused(":taskWithInputs")

        where:

        buildFile << """
            plugins.apply(my.MyPlugin)
            println("configuring root")
        """
    }

    def "parameterized models are reused in the same build action"() {
        when:
        executer.withArguments(ENABLE_CLI)
        def models = runBuildAction(new FetchParameterizedCustomModelForEachProject(["fetch1", "fetch2", "fetch1", "fetch2"]))

    /**
     * <p>
     *     Adds a predicate to determine whether previous outputs of this task can be reused.
     *     The given closure is executed at task execution time.
     *     The closure is passed the task as a parameter.
     *     If the closure returns false, previous outputs of this task cannot be reused and the task will be executed.
     *     That means the task is out-of-date and no outputs will be loaded from the build cache.