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构建编译Task替换2

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根据TaskManager中的Task构建方式进行替换Task

源码

DefaultTaskContainer源码

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public <T extends Task> T create(String name, Class<T> type, Action<? super T> configuration) throws InvalidUserDataException {
        T task = this.create(name, type);
        configuration.execute(task);
        return task;
    }

TaskManager

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public void createBuildConfigTask(@NonNull TaskFactory tasks, @NonNull VariantScope scope) {
        AndroidTask<GenerateBuildConfig> generateBuildConfigTask =
                androidTasks.create(tasks, new GenerateBuildConfig.ConfigAction(scope));
        scope.setGenerateBuildConfigTask(generateBuildConfigTask);
        scope.getSourceGenTask().dependsOn(tasks, generateBuildConfigTask.getName());
        if (scope.getVariantConfiguration().getType().isForTesting()) {
            // in case of a test project, the manifest is generated so we need to depend
            // on its creation.

            generateBuildConfigTask.dependsOn(tasks, scope.getManifestProcessorTask());
        } else {
            generateBuildConfigTask.dependsOn(tasks, scope.getCheckManifestTask());
        }
    }

实现

ReplaceTask

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public abstract class ReplaceTask<T extends Task, R extends Task> {
    public ReplaceTask() {
    }

    public abstract Class<R> getReplaceTaskClass();

    public abstract Class<T> getCustomTaskClass();

    public abstract Task createTask(Task task,Project project,VariantScope variantScope);


    public void replace(Project project) {
        List<Task> replaceTasks = new ArrayList<>();
        for (Task task : project.getTasks()) {
            if (task.getClass().getName().startsWith(getReplaceTaskClass().getName())) {
                replaceTasks.add(task);
            }
        }

        for (Task replaceTask : replaceTasks) {
            project.getTasks().remove(replaceTask);
        }

        for (Task replaceTask : replaceTasks) {
            VariantScope variantScope = getVariantScope(project,((BaseTask)replaceTask).getVariantName());
            Task task = createTask(replaceTask,project, variantScope);
            task.dependsOn(replaceTask.getDependsOn());
        }

    }

    public VariantScope getVariantScope(Project project, String variantName) {
        List<VariantScope> variantScopes = null;
        if (project.getPlugins().hasPlugin(AppPlugin.class)) {
           variantScopes = project.getPlugins().getPlugin(AppPlugin.class).getVariantManager().getVariantScopes();
        } else if(project.getPlugins().hasPlugin(LibraryPlugin.class)){
            variantScopes = project.getPlugins().getPlugin(LibraryPlugin.class).getVariantManager().getVariantScopes();
        }

        if(variantScopes == null || variantScopes.isEmpty()){
            throw new RuntimeException("scope ex");
        }

        for (VariantScope variantScope: variantScopes){
            if(variantScope.getFullVariantName().equals(variantName)){
                return variantScope;
            }
        }
        return null;
    }
}

GenerateBuildConfigExt

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public class GenerateBuildConfigExt extends GenerateBuildConfig {

    @TaskAction
    void process() {
        System.out.println("测试");
    }

}

GenerateBuildConfigReplace

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public class GenerateBuildConfigReplace extends ReplaceTask<GenerateBuildConfigExt, GenerateBuildConfig>{
    @Override
    public Class<GenerateBuildConfig> getReplaceTaskClass() {
        return GenerateBuildConfig.class;
    }

    @Override
    public Class<GenerateBuildConfigExt> getCustomTaskClass() {
        return GenerateBuildConfigExt.class;
    }

    @Override
    public Task createTask(Task task,Project project, VariantScope variantScope) {
        return  project.getTasks().create(task.getName(), GenerateBuildConfigExt.class, new GenerateBuildConfigExt.ConfigAction(variantScope));
    }
}

运行

image.png

问题

  • Task中将会有两个@TaskAction，并且子类访问不到父类中的私有属性
  • 部分父类ConfigAction是final修饰，我们无法继承

综上，这种方式也是存在一定的局限性