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本文主要研究一下PowerJob的ProcessorLoader
ProcessorLoader
tech/powerjob/worker/processor/ProcessorLoader.java
代码语言：javascript复制public interface ProcessorLoader {
ProcessorBean load(ProcessorDefinition definition);
}ProcessorLoader定义了load方法，用于根据ProcessorDefinition加载ProcessorBean
ProcessorDefinition
tech/powerjob/worker/extension/processor/ProcessorDefinition.java
代码语言：javascript复制@Getter
@Setter
@ToString
@Accessors(chain = true)
public class ProcessorDefinition implements Serializable {
/**
* 后台配置的处理器类型
*/
private String processorType;
/**
* 后台配置的处理器信息
*/
private String processorInfo;
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ProcessorDefinition that = (ProcessorDefinition) o;
return Objects.equals(processorType, that.processorType) && Objects.equals(processorInfo, that.processorInfo);
}
@Override
public int hashCode() {
return Objects.hash(processorType, processorInfo);
}
}ProcessorDefinition定义了processorType及processorInfo两个属性
ProcessorBean
tech/powerjob/worker/extension/processor/ProcessorBean.java
代码语言：javascript复制@Getter
@Setter
@Accessors(chain = true)
public class ProcessorBean {
/**
* 真正用来执行逻辑的处理器对象
*/
private transient BasicProcessor processor;
/**
* 加载该处理器对象的 classLoader，可空，空则使用 {@link Object#getClass()#getClassLoader() 代替}
*/
private transient ClassLoader classLoader;
}ProcessorBean定义了BasicProcessor及ClassLoader两个属性
PowerJobProcessorLoader
tech/powerjob/worker/processor/PowerJobProcessorLoader.java
代码语言：javascript复制@Slf4j
public class PowerJobProcessorLoader implements ProcessorLoader {
private final List<ProcessorFactory> processorFactoryList;
private final Map<ProcessorDefinition, ProcessorBean> def2Bean = new ConcurrentHashMap<>(128);
public PowerJobProcessorLoader(List<ProcessorFactory> processorFactoryList) {
this.processorFactoryList = processorFactoryList;
}
@Override
public ProcessorBean load(ProcessorDefinition definition) {
return def2Bean.computeIfAbsent(definition, ignore -> {
final String processorType = definition.getProcessorType();
log.info("[ProcessorFactory] start to load Processor: {}", definition);
for (ProcessorFactory pf : processorFactoryList) {
final String pfName = pf.getClass().getSimpleName();
if (!Optional.ofNullable(pf.supportTypes()).orElse(Collections.emptySet()).contains(processorType)) {
log.info("[ProcessorFactory] [{}] can't load type={}, skip!", pfName, processorType);
continue;
}
log.info("[ProcessorFactory] [{}] try to load processor: {}", pfName, definition);
try {
ProcessorBean processorBean = pf.build(definition);
if (processorBean != null) {
log.info("[ProcessorFactory] [{}] load processor successfully: {}", pfName, definition);
return processorBean;
}
} catch (Throwable t) {
log.error("[ProcessorFactory] [{}] load processor failed: {}", pfName, definition, t);
}
}
throw new PowerJobException("fetch Processor failed, please check your processorType and processorInfo config");
});
}
}PowerJobProcessorLoader实现了ProcessorLoader接口，其构造器要求传入processorFactoryList，它还定义了def2Bean，用于维护ProcessorDefinition与ProcessorBean的关系；其load方法使用ConcurrentHashMap的computeIfAbsent，将加载好的ProcessorBean放入到def2Bean；其加载过程为遍历processorFactoryList，找到支持该processorType的ProcessorFactory，然后执行其build方法进行构造
ProcessorFactory
tech/powerjob/worker/extension/processor/ProcessorFactory.java
代码语言：javascript复制public interface ProcessorFactory {
/**
* 支持的处理器类型，类型不匹配则跳过该 ProcessorFactory 的加载逻辑
* 对应的是控制台的'处理器类型' TAB，不做任何定制的情况下，取值范围为 {@link ProcessorType#name()}
* @return 支持的处理器类型
*/
Set<String> supportTypes();
/**
* 根据处理器定义构建处理器对象
* 注意：Processor 为单例对象，即 PowerJob 对每一个 ProcessorBean 只调用一次 build 方法
* @param processorDefinition 处理器定义
* @return null or ProcessorBean
*/
ProcessorBean build(ProcessorDefinition processorDefinition);
}ProcessorFactory接口定义了supportTypes、build方法；它有四个实现类，其中BuiltInSpringProcessorFactory及BuildInSpringMethodProcessorFactory继承自AbstractBuildInSpringProcessorFactory，另外两个为BuiltInDefaultProcessorFactory、JarContainerProcessorFactory
BuiltInDefaultProcessorFactory
tech/powerjob/worker/processor/impl/BuiltInDefaultProcessorFactory.java
代码语言：javascript复制@Slf4j
public class BuiltInDefaultProcessorFactory implements ProcessorFactory {
@Override
public Set<String> supportTypes() {
return Sets.newHashSet(ProcessorType.BUILT_IN.name());
}
@Override
public ProcessorBean build(ProcessorDefinition processorDefinition) {
String className = processorDefinition.getProcessorInfo();
try {
Class<?> clz = Class.forName(className);
BasicProcessor basicProcessor = (BasicProcessor) clz.getDeclaredConstructor().newInstance();
return new ProcessorBean()
.setProcessor(basicProcessor)
.setClassLoader(basicProcessor.getClass().getClassLoader());
}catch (Exception e) {
log.warn("[ProcessorFactory] load local Processor(className = {}) failed.", className, e);
}
return null;
}
}BuiltInDefaultProcessorFactory是默认的处理器工厂，通过全限定类名加载处理器，但没有IOC功能
JarContainerProcessorFactory
tech/powerjob/worker/processor/impl/JarContainerProcessorFactory.java
代码语言：javascript复制@Slf4j
public class JarContainerProcessorFactory implements ProcessorFactory {
private final WorkerRuntime workerRuntime;
public JarContainerProcessorFactory(WorkerRuntime workerRuntime) {
this.workerRuntime = workerRuntime;
}
@Override
public Set<String> supportTypes() {
return Sets.newHashSet(ProcessorType.EXTERNAL.name());
}
@Override
public ProcessorBean build(ProcessorDefinition processorDefinition) {
String processorInfo = processorDefinition.getProcessorInfo();
String[] split = processorInfo.split("#");
String containerName = split[0];
String className = split[1];
log.info("[ProcessorFactory] try to load processor({}) in container({})", className, containerName);
OmsContainer omsContainer = OmsContainerFactory.fetchContainer(Long.valueOf(containerName), workerRuntime);
if (omsContainer != null) {
return new ProcessorBean()
.setProcessor(omsContainer.getProcessor(className))
.setClassLoader(omsContainer.getContainerClassLoader());
} else {
log.warn("[ProcessorFactory] load container failed. processor info : {}", processorInfo);
}
return null;
}
}JarContainerProcessorFactory主要是通过OmsContainer来加载ProcessorBean
AbstractBuildInSpringProcessorFactory
tech/powerjob/worker/processor/impl/AbstractBuildInSpringProcessorFactory.java
代码语言：javascript复制@Slf4j
public abstract class AbstractBuildInSpringProcessorFactory implements ProcessorFactory {
protected final ApplicationContext applicationContext;
protected AbstractBuildInSpringProcessorFactory(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
@Override
public Set<String> supportTypes() {
return Sets.newHashSet(ProcessorType.BUILT_IN.name());
}
protected boolean checkCanLoad() {
try {
ApplicationContext.class.getClassLoader();
return applicationContext != null;
} catch (Throwable ignore) {
}
return false;
}
@SuppressWarnings("unchecked")
protected static <T> T getBean(String className, ApplicationContext ctx) throws Exception {
// 0. 尝试直接用 Bean 名称加载
try {
final Object bean = ctx.getBean(className);
if (bean != null) {
return (T) bean;
}
} catch (Exception ignore) {
}
// 1. ClassLoader 存在，则直接使用 clz 加载
ClassLoader classLoader = ctx.getClassLoader();
if (classLoader != null) {
return (T) ctx.getBean(classLoader.loadClass(className));
}
// 2. ClassLoader 不存在(系统类加载器不可见)，尝试用类名称小写加载
String[] split = className.split("\.");
String beanName = split[split.length - 1];
// 小写转大写
char[] cs = beanName.toCharArray();
cs[0] = 32;
String beanName0 = String.valueOf(cs);
log.warn("[SpringUtils] can't get ClassLoader from context[{}], try to load by beanName:{}", ctx, beanName0);
return (T) ctx.getBean(beanName0);
}
}AbstractBuildInSpringProcessorFactory是两个spring相关ProcessorFactory的抽象类，它使用spring的ApplicationContext来加载
BuiltInSpringProcessorFactory
tech/powerjob/worker/processor/impl/BuiltInSpringProcessorFactory.java
代码语言：javascript复制@Slf4j
public class BuiltInSpringProcessorFactory extends AbstractBuildInSpringProcessorFactory {
public BuiltInSpringProcessorFactory(ApplicationContext applicationContext) {
super(applicationContext);
}
@Override
public ProcessorBean build(ProcessorDefinition processorDefinition) {
try {
boolean canLoad = checkCanLoad();
if (!canLoad) {
log.info("[ProcessorFactory] can't find Spring env, this processor can't load by 'BuiltInSpringProcessorFactory'");
return null;
}
String processorInfo = processorDefinition.getProcessorInfo();
//用于区分方法级别的参数
if (processorInfo.contains("#")) {
return null;
}
BasicProcessor basicProcessor = getBean(processorInfo, applicationContext);
return new ProcessorBean()
.setProcessor(basicProcessor)
.setClassLoader(basicProcessor.getClass().getClassLoader());
} catch (NoSuchBeanDefinitionException ignore) {
log.warn("[ProcessorFactory] can't find the processor in SPRING");
} catch (Throwable t) {
log.warn("[ProcessorFactory] load by BuiltInSpringProcessorFactory failed. If you are using Spring, make sure this bean was managed by Spring", t);
}
return null;
}
}BuiltInSpringProcessorFactory通过ApplicationContext加载spring相关的Bean，但它不处理processorInfo包含
#的processorDefinition
BuildInSpringMethodProcessorFactory
tech/powerjob/worker/processor/impl/BuildInSpringMethodProcessorFactory.java
代码语言：javascript复制@Slf4j
public class BuildInSpringMethodProcessorFactory extends AbstractBuildInSpringProcessorFactory {
private static final List<String> jobHandlerRepository = new LinkedList<>();
private final static String DELIMITER = "#";
public BuildInSpringMethodProcessorFactory(ApplicationContext applicationContext) {
super(applicationContext);
}
@Override
public ProcessorBean build(ProcessorDefinition processorDefinition) {
try {
boolean canLoad = checkCanLoad();
if (!canLoad) {
log.info("[ProcessorFactory] can't find Spring env, this processor can't load by 'BuildInSpringMethodProcessorFactory'");
return null;
}
String processorInfo = processorDefinition.getProcessorInfo();
if (!processorInfo.contains(DELIMITER)) {
log.info("[ProcessorFactory] can't parse processorDefinition, this processor can't load by 'BuildInSpringMethodProcessorFactory'");
return null;
}
String[] split = processorInfo.split(DELIMITER);
String methodName = split[1];
String className = split[0];
Object bean = getBean(className,applicationContext);
Method[] methods = bean.getClass().getDeclaredMethods();
for (Method method : methods) {
PowerJobHandler powerJob = method.getAnnotation(PowerJobHandler.class);
if (powerJob == null) {
continue;
}
String name = powerJob.name();
//匹配到和页面定义相同的methodName
if (!name.equals(methodName)) {
continue;
}
if (name.trim().length() == 0) {
throw new RuntimeException("method-jobhandler name invalid, for[" bean.getClass() "#" method.getName() "] .");
}
if (containsJobHandler(name)) {
throw new RuntimeException("jobhandler[" name "] naming conflicts.");
}
method.setAccessible(true);
registerJobHandler(methodName);
MethodBasicProcessor processor = new MethodBasicProcessor(bean, method);
return new ProcessorBean()
.setProcessor(processor)
.setClassLoader(processor.getClass().getClassLoader());
}
} catch (NoSuchBeanDefinitionException ignore) {
log.warn("[ProcessorFactory] can't find the processor in SPRING");
} catch (Throwable t) {
log.warn("[ProcessorFactory] load by BuiltInSpringProcessorFactory failed. If you are using Spring, make sure this bean was managed by Spring", t);
}
return null;
}
public static void registerJobHandler(String name) {
jobHandlerRepository.add(name);
}
private boolean containsJobHandler(String name) {
return jobHandlerRepository.contains(name);
}
}BuildInSpringMethodProcessorFactory专门用于processorInfo包含
#的processorDefinition，它会遍历指定class的methods，找到方法上标注有@PowerJobHandler注解且方法名一致的method，注册到jobHandlerRepository，其创建的是MethodBasicProcessor
小结
PowerJob的ProcessorLoader定义了load方法，用于根据ProcessorDefinition加载ProcessorBean；PowerJobProcessorLoader实现了ProcessorLoader接口，它会遍历processorFactoryList，找到支持该processorType的ProcessorFactory，然后执行其build方法进行构造；ProcessorFactory接口定义了supportTypes、build方法；它有四个实现类，其中BuiltInSpringProcessorFactory及BuildInSpringMethodProcessorFactory继承自AbstractBuildInSpringProcessorFactory，另外两个为BuiltInDefaultProcessorFactory、JarContainerProcessorFactory。
