Gradle源码入门八

启动的时候，调用了



launcher.cli.BuildActionsFactory.java

    private Runnable runBuildInProcess(StartParameter startParameter, DaemonParameters daemonParameters, ServiceRegistry loggingServices) {
        ServiceRegistry globalServices = ServiceRegistryBuilder.builder()
                .displayName("Global services")
                .parent(loggingServices)
                .parent(NativeServices.getInstance())
                .provider(new GlobalScopeServices(false))
                .build();
        InProcessBuildActionExecuter executer = new InProcessBuildActionExecuter(globalServices.get(GradleLauncherFactory.class));
        return daemonBuildAction(startParameter, daemonParameters, executer);
    }
	build()会调用
	 /**
     * Adds a service provider bean to this registry. This provider may define factory and decorator methods.
     */
    public DefaultServiceRegistry addProvider(Object provider) {
        findProviderMethods(provider);
        return this;
    }

最后会走到
	org\gradle\internal\service\scopes\GlobalScopeServices.java

	void configure(ServiceRegistration registration, ClassLoaderRegistry classLoaderRegistry) {
        final List<PluginServiceRegistry> pluginServiceFactories = new ServiceLocator(classLoaderRegistry.getRuntimeClassLoader(), classLoaderRegistry.getPluginsClassLoader()).getAll(PluginServiceRegistry.class);
        for (PluginServiceRegistry pluginServiceRegistry : pluginServiceFactories) {
            registration.add(PluginServiceRegistry.class, pluginServiceRegistry);
            pluginServiceRegistry.registerGlobalServices(registration);
        }
    }

getAll 会根据PluginServiceRegistry.class一系列规则，找到所有factory方法，规则如下：

规则就是ServiceLocator.java 的findFactoriesForServiceType(serviceType);

resourceName = ‘META-INF/services/org.gradle.internal.service.scopes.PluginServiceRegistry‘

找到

jar:file:/C:/gradle-2.2.1/lib/gradle-launcher-2.2.1.jar!/META-INF/services/org.gradle.internal.service.scopes.PluginServiceRegistry

->[org.gradle.tooling.internal.provider.ToolingServices]

implementations.add(implClass.asSubclass(serviceType));//父类是参数，转为子类

implClass = class org.gradle.tooling.internal.provider.ToolingServices

serviceType = interface org.gradle.internal.service.scopes.PluginServiceRegistry

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可能有多个classLoader去load，所以可能会找到同样的jar包，代码保证重复的就不做了

jar:file:/C:/gradle-2.2.1/lib/gradle-launcher-2.2.1.jar!/META-INF/services/org.gradle.internal.service.scopes.PluginServiceRegistry

continue

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找到

jar:file:/C:/gradle-2.2.1/lib/plugins/gradle-dependency-management-2.2.1.jar!/META-INF/services/org.gradle.internal.service.scopes.PluginServiceRegistry

－>

[class org.gradle.tooling.internal.provider.ToolingServices]

把所有实现的类名加入factory列表。