接着上一篇博客开始讲：
5. Gradle编译其他应用程序流程(一)
一. BuildActionsFactory.runBuildInProcess
private Runnable runBuildInProcess(StartParameter startParameter, DaemonParameters daemonParameters, ServiceRegistry loggingServices) {
ServiceRegistry globalServices = ServiceRegistryBuilder.builder()
.displayName("Global services")
.parent(loggingServices)
.parent(NativeServices.getInstance())
.provider(new GlobalScopeServices(startParameter.isContinuous()))
.build();
return runBuildAndCloseServices(startParameter, daemonParameters, globalServices.get(BuildExecuter.class), globalServices);
}这个方法就是很绕的地方了！看了半天才大概明白。
首先runBuildInProcess这个方法分成两个部分
1. 初始化
2. 执行
首先来看初始化，也就是：
ServiceRegistry globalServices = ServiceRegistryBuilder.builder()
.displayName("Global services")
.parent(loggingServices)
.parent(NativeServices.getInstance())
.provider(new GlobalScopeServices(startParameter.isContinuous()))
.build();直接看build():
public ServiceRegistry build() {
DefaultServiceRegistry registry = new DefaultServiceRegistry(displayName, parents);
for (Object provider : providers) {
registry.addProvider(provider);
}
return registry;
}实例化的是DefaultServiceRegistry对象，那来看看DefaultServiceRegistry的Javadoc，看看怎么描述的。
org.gradle.internal.service.DefaultServiceRegistry
A hierarchical ServiceRegistry implementation.
Subclasses can register services by:
Calling add(Class, Object) to register a service instance.
Calling addProvider(Object) to register a service provider bean. A provider bean may have factory, decorator and configuration methods as described below.
Adding a factory method. A factory method should have a name that starts with 'create', and have a non-void return type. For example, protected SomeService createSomeService() { .... }. Parameters are injected using services from this registry or its parents. Note that factory methods with a single parameter and an return type equal to that parameter type are interpreted as decorator methods.
Adding a decorator method. A decorator method should have a name that starts with 'decorate', take a single parameter, and a have return type equal to the parameter type. Before invoking the method, the parameter is located in the parent service registry and then passed to the method.
Adding a configure method. A configure method should be called 'configure', take a ServiceRegistration parameter, and a have a void return type. Additional parameters are injected using services from this registry or its parents.
Service instances are created on demand. getFactory(Class) looks for a service instance which implements Factory where T is the expected type.
Service instances and factories are closed when the registry that created them is closed using close(). If a service instance or factory implements java.io.Closeable or org.gradle.internal.concurrent.Stoppable then the appropriate close() or stop() method is called. Instances are closed in reverse dependency order.
Service registries are arranged in a hierarchy. If a service of a given type cannot be located, the registry uses its parent registry, if any, to locate the service.
主要意思就是DefaultServiceRegistry可以通过add(xxx)方法接受服务对象，通过addProvider(xxx)方法接受service provider bean对象。
而service provider bean可以有3种类型的方法
factory 方法
'create'开头，不是void的返回值，等等
decorator 方法
'decorator'开头，等等
configure 方法
'configure'方法，有个ServiceRegistration参数，void返回类型，等等。 那我们回过头来看初始化方法，里面传入了GlobalScopeServices作为provider，所以看下GlobalScopeServices。
二. GlobalScopeServices
public class GlobalScopeServices {
...
void configure(ServiceRegistration registration, ClassLoaderRegistry classLoaderRegistry) {
System.out.println("GlobalScopeServices configure registration : " + registration
+ " classLoaderRegistry: " + classLoaderRegistry);
final List pluginServiceFactories = new DefaultServiceLocator(classLoaderRegistry.getRuntimeClassLoader(), classLoaderRegistry.getPluginsClassLoader()).getAll(PluginServiceRegistry.class);
for (PluginServiceRegistry pluginServiceRegistry : pluginServiceFactories) {
registration.add(PluginServiceRegistry.class, pluginServiceRegistry);
pluginServiceRegistry.registerGlobalServices(registration);
}
}
...
ClassLoaderRegistry createClassLoaderRegistry(ClassPathRegistry classPathRegistry, HashingClassLoaderFactory classLoaderFactory) {
if (GradleRuntimeShadedJarDetector.isLoadedFrom(getClass())) {
return new FlatClassLoaderRegistry(getClass().getClassLoader());
}
System.out.println("createClassLoaderRegistry");
return new DefaultClassLoaderRegistry(classPathRegistry, classLoaderFactory);
}
...
} 首先看configure方法
pluginServiceRegistry.registerGlobalServices(registration);
这行代码registerGlobalServices其实调用的是LauncherServices.registerGlobalServices
也就是：
public class LauncherServices implements PluginServiceRegistry {
public void registerGlobalServices(ServiceRegistration registration) {
registration.addProvider(new ToolingGlobalScopeServices());
}
static class ToolingGlobalScopeServices {
BuildExecuter createBuildExecuter(GradleLauncherFactory gradleLauncherFactory, ServiceRegistry globalServices, ListenerManager listenerManager, FileWatcherFactory fileWatcherFactory, ExecutorFactory executorFactory, StyledTextOutputFactory styledTextOutputFactory) {
List buildActionRunners = globalServices.getAll(BuildActionRunner.class);
BuildActionExecuter delegate = new InProcessBuildActionExecuter(gradleLauncherFactory, new ChainingBuildActionRunner(buildActionRunners));
return new ContinuousBuildActionExecuter(delegate, fileWatcherFactory, listenerManager, styledTextOutputFactory, executorFactory);
}
ExecuteBuildActionRunner createExecuteBuildActionRunner() {
return new ExecuteBuildActionRunner();
}
ClassLoaderCache createClassLoaderCache() {
return new ClassLoaderCache();
}
}
} registerGlobalServices的时候，实例化并添加了ToolingGlobalScopeServices对象。
最主要的是实例化了一个InProcessBuildActionExecuter对象，当然这里又不能免俗的使用了装饰者模式(ContinuousBuildActionExecuter包含了InProcessBuildActionExecuter，其实还是调用InProcessBuildActionExecuter.execute)
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这个中间的逻辑非常绕，就是怎么回调到provider的factory和config方法？
有兴趣的同学可以自己去看。我贴一段中间回调createXXX的代码调用堆栈(也就是factory方法的调用)
java.lang.Exception: Sandy DefaultModule init at org.gradle.api.internal.classpath.DefaultModuleRegistry$DefaultModule.(DefaultModuleRegistry.java:256) at org.gradle.api.internal.classpath.DefaultModuleRegistry.module(DefaultModuleRegistry.java:121) at org.gradle.api.internal.classpath.DefaultModuleRegistry.loadModule(DefaultModuleRegistry.java:89) at org.gradle.api.internal.classpath.DefaultModuleRegistry.getModule(DefaultModuleRegistry.java:77) at org.gradle.api.internal.DynamicModulesClassPathProvider.findClassPath(DynamicModulesClassPathProvider.java:38) at org.gradle.api.internal.DefaultClassPathRegistry.getClassPath(DefaultClassPathRegistry.java:34) at org.gradle.initialization.DefaultClassLoaderRegistry. (DefaultClassLoaderRegistry.java:32) at org.gradle.internal.service.scopes.GlobalScopeServices.createClassLoaderRegistry(GlobalScopeServices.java:212) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75) at org.gradle.internal.service.DefaultServiceRegistry.invoke(DefaultServiceRegistry.java:468) at org.gradle.internal.service.DefaultServiceRegistry.access$1200(DefaultServiceRegistry.java:84) at org.gradle.internal.service.DefaultServiceRegistry$FactoryMethodService.invokeMethod(DefaultServiceRegistry.java:803) at org.gradle.internal.service.DefaultServiceRegistry$FactoryService.create(DefaultServiceRegistry.java:758) at org.gradle.internal.service.DefaultServiceRegistry$ManagedObjectProvider.getInstance(DefaultServiceRegistry.java:595) at org.gradle.internal.service.DefaultServiceRegistry$SingletonService.get(DefaultServiceRegistry.java:640) at org.gradle.internal.service.DefaultServiceRegistry.applyConfigureMethod(DefaultServiceRegistry.java:257) at org.gradle.internal.service.DefaultServiceRegistry.findProviderMethods(DefaultServiceRegistry.java:216) at org.gradle.internal.service.DefaultServiceRegistry.addProvider(DefaultServiceRegistry.java:358) at org.gradle.internal.service.ServiceRegistryBuilder.build(ServiceRegistryBuilder.java:52) at org.gradle.launcher.cli.BuildActionsFactory.runBuildInProcess(BuildActionsFactory.java:135) at org.gradle.launcher.cli.BuildActionsFactory.createAction(BuildActionsFactory.java:91) at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.createAction(CommandLineActionFactory.java:255) at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:240) at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:217) at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:33) at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24) at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33) at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22) at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:210) at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:174) at org.gradle.launcher.Main.doAction(Main.java:33) at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:60) at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:37) at org.gradle.launcher.GradleMain.main(GradleMain.java:24)
三. 执行
private Runnable runBuildInProcess(StartParameter startParameter, DaemonParameters daemonParameters, ServiceRegistry loggingServices) {
ServiceRegistry globalServices = ServiceRegistryBuilder.builder()
.displayName("Global services")
.parent(loggingServices)
.parent(NativeServices.getInstance())
.provider(new GlobalScopeServices(startParameter.isContinuous()))
.build();
return runBuildAndCloseServices(startParameter, daemonParameters, globalServices.get(BuildExecuter.class), globalServices);
}
private Runnable runBuildAndCloseServices(StartParameter startParameter, DaemonParameters daemonParameters, BuildActionExecuter executer, ServiceRegistry sharedServices, Object... stopBeforeSharedServices) {
BuildActionParameters parameters = createBuildActionParamters(startParameter, daemonParameters);
Stoppable stoppable = new CompositeStoppable().add(stopBeforeSharedServices).add(sharedServices);
return new RunBuildAction(executer, startParameter, clientMetaData(), getBuildStartTime(), parameters, sharedServices, stoppable);
}
public class RunBuildAction implements Runnable {
ServiceRegistry globalServices = ServiceRegistryBuilder.builder()
.displayName("Global services")
.parent(loggingServices)
.parent(NativeServices.getInstance())
.provider(new GlobalScopeServices(startParameter.isContinuous()))
.build();
public void run() {
try {
System.out.println("RunBuildAction executer: " + executer
+ " startParameter: " + startParameter
+ " buildActionParameters: " + buildActionParameters);
executer.execute(
new ExecuteBuildAction(startParameter),
new DefaultBuildRequestContext(new DefaultBuildRequestMetaData(clientMetaData, startTime), new DefaultBuildCancellationToken(), new NoOpBuildEventConsumer()),
buildActionParameters,
sharedServices);
} finally {
if (stoppable != null) {
stoppable.stop();
}
}
}
} 在RunBuildAction里面执行的还是executer.execute，也就是第三个参数globalServices.get(BuildExecuter.class)
globalServices是build出来的DefaultServiceRegistry对象
其实就是GlobalScopeServices.configure方法里面的ServiceRegistration对象。
void configure(ServiceRegistration registration, ClassLoaderRegistry classLoaderRegistry) {
System.out.println("GlobalScopeServices configure registration : " + registration
+ " classLoaderRegistry: " + classLoaderRegistry);
final List pluginServiceFactories = new DefaultServiceLocator(classLoaderRegistry.getRuntimeClassLoader(), classLoaderRegistry.getPluginsClassLoader()).getAll(PluginServiceRegistry.class);
for (PluginServiceRegistry pluginServiceRegistry : pluginServiceFactories) {
registration.add(PluginServiceRegistry.class, pluginServiceRegistry);
pluginServiceRegistry.registerGlobalServices(registration);
}
} 打印日志：
GlobalScopeServices configure registration : org.gradle.internal.service.DefaultServiceRegistry$1@56620197 classLoaderRegistry: org.gradle.initialization.DefaultClassLoaderRegistry@393671df
接下来又继续在configure然后调用
pluginServiceRegistry.registerGlobalServices(registration);
根据前面说明的分析，这个registerGlobalServices方法就是调用LauncherServices.registerGlobalServices(registration)，参数是DefaultServiceRegistry registration
public class LauncherServices implements PluginServiceRegistry {
public void registerGlobalServices(ServiceRegistration registration) {
registration.addProvider(new ToolingGlobalScopeServices());
}
static class ToolingGlobalScopeServices {
BuildExecuter createBuildExecuter(GradleLauncherFactory gradleLauncherFactory, ServiceRegistry globalServices, ListenerManager listenerManager, FileWatcherFactory fileWatcherFactory, ExecutorFactory executorFactory, StyledTextOutputFactory styledTextOutputFactory) {
List buildActionRunners = globalServices.getAll(BuildActionRunner.class);
BuildActionExecuter delegate = new InProcessBuildActionExecuter(gradleLauncherFactory, new ChainingBuildActionRunner(buildActionRunners));
return new ContinuousBuildActionExecuter(delegate, fileWatcherFactory, listenerManager, styledTextOutputFactory, executorFactory);
}
}
} 所以也就是给DefaultServiceRegistry registration add了一个ToolingGlobalScopeServices对象。
这样就关联起来了，也就是说RunBuildAction.run方法里面执行的executer.execute走的就是ContinuousBuildActionExecuter.execute，然后通过装饰者模式，最后走的是InProcessBuildActionExecuter.execute方法。
很绕！！！
下面来看InProcessBuildActionExecuter.execute方法。
四. InProcessBuildActionExecuter
@Override
public GradleLauncher newInstance(StartParameter startParameter, BuildRequestContext requestContext, ServiceRegistry parentRegistry) {
// This should only be used for top-level builds
if (tracker.getCurrentBuild() != null) {
throw new IllegalStateException("Cannot have a current build");
}
BuildScopeServices buildScopeServices = createBuildScopeServices(parentRegistry);
DefaultGradleLauncher launcher = doNewInstance(startParameter, false, requestContext.getCancellationToken(), requestContext, requestContext.getEventConsumer(), buildScopeServices);
DeploymentRegistry deploymentRegistry = parentRegistry.get(DeploymentRegistry.class);
deploymentRegistry.onNewBuild(launcher.getGradle());
return launcher;
}
public class InProcessBuildActionExecuter implements BuildActionExecuter {
private final GradleLauncherFactory gradleLauncherFactory;
private final BuildActionRunner buildActionRunner;
public InProcessBuildActionExecuter(GradleLauncherFactory gradleLauncherFactory, BuildActionRunner buildActionRunner) {
this.gradleLauncherFactory = gradleLauncherFactory;
this.buildActionRunner = buildActionRunner;
}
public Object execute(BuildAction action, BuildRequestContext buildRequestContext, BuildActionParameters actionParameters, ServiceRegistry contextServices) {
GradleLauncher gradleLauncher = gradleLauncherFactory.newInstance(action.getStartParameter(), buildRequestContext, contextServices);
try {
gradleLauncher.addStandardOutputListener(buildRequestContext.getOutputListener());
gradleLauncher.addStandardErrorListener(buildRequestContext.getErrorListener());
GradleBuildController buildController = new GradleBuildController(gradleLauncher);
buildActionRunner.run(action, buildController);
System.out.println("Sandy buildController.getResult(): " + buildController.getResult());
return buildController.getResult();
} finally {
gradleLauncher.stop();
}
}
} 从代码来看newInstance返回的对象是DefaultGradleLauncher，那么接下来就真正走到开始编译的过程了，这个下篇再继续分析。
最后，附上一点DefaultGradleLauncher源代码：
public class DefaultGradleLauncher extends GradleLauncher {
private enum Stage {
Load, Configure, Build
}
...
@Override
public BuildResult run() {
return doBuild(Stage.Build);
}
@Override
public BuildResult getBuildAnalysis() {
return doBuild(Stage.Configure);
}
@Override
public BuildResult load() throws ReportedException {
return doBuild(Stage.Load);
}
private BuildResult doBuild(final Stage upTo) {
return buildOperationExecutor.run("Run build", new Factory() {
@Override
public BuildResult create() {
...
doBuildStages(upTo);
...
}
});
}
private void doBuildStages(Stage upTo) {
if (stage == Stage.Build) {
throw new IllegalStateException("Cannot build with GradleLauncher multiple times");
}
if (stage == null) {
// Evaluate init scripts
initScriptHandler.executeScripts(gradle);
// Build `buildSrc`, load settings.gradle, and construct composite (if appropriate)
settings = settingsLoader.findAndLoadSettings(gradle);
stage = Stage.Load;
}
if (upTo == Stage.Load) {
return;
}
if (stage == Stage.Load) {
// Configure build
buildOperationExecutor.run("Configure build", new Runnable() {
@Override
public void run() {
buildConfigurer.configure(gradle);
if (!gradle.getStartParameter().isConfigureOnDemand()) {
buildListener.projectsEvaluated(gradle);
}
modelConfigurationListener.onConfigure(gradle);
}
});
stage = Stage.Configure;
}
if (upTo == Stage.Configure) {
return;
}
// After this point, the GradleLauncher cannot be reused
stage = Stage.Build;
// Populate task graph
buildOperationExecutor.run("Calculate task graph", new Runnable() {
@Override
public void run() {
buildConfigurationActionExecuter.select(gradle);
if (gradle.getStartParameter().isConfigureOnDemand()) {
buildListener.projectsEvaluated(gradle);
}
}
});
// Execute build
buildOperationExecutor.run("Run tasks", new Runnable() {
@Override
public void run() {
buildExecuter.execute(gradle);
}
});
}
...
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