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本文主要研究一下JetCacheProxyConfiguration

JetCacheProxyConfiguration

com/alicp/jetcache/anno/config/JetCacheProxyConfiguration.java

@Configuration
public class JetCacheProxyConfiguration implements ImportAware, ApplicationContextAware {

    protected AnnotationAttributes enableMethodCache;
    private ApplicationContext applicationContext;

    @Override
    public void setImportMetadata(AnnotationMetadata importMetadata) {
        this.enableMethodCache = AnnotationAttributes.fromMap(
                importMetadata.getAnnotationAttributes(EnableMethodCache.class.getName(), false));
        if (this.enableMethodCache == null) {
            throw new IllegalArgumentException(
                    "@EnableMethodCache is not present on importing class " + importMetadata.getClassName());
        }
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Bean(name = CacheAdvisor.CACHE_ADVISOR_BEAN_NAME)
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public CacheAdvisor jetcacheAdvisor(JetCacheInterceptor jetCacheInterceptor) {
        CacheAdvisor advisor = new CacheAdvisor();
        advisor.setAdviceBeanName(CacheAdvisor.CACHE_ADVISOR_BEAN_NAME);
        advisor.setAdvice(jetCacheInterceptor);
        advisor.setBasePackages(this.enableMethodCache.getStringArray("basePackages"));
        advisor.setOrder(this.enableMethodCache.<Integer>getNumber("order"));
        return advisor;
    }

    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public JetCacheInterceptor jetCacheInterceptor() {
        return new JetCacheInterceptor();
    }

}

JetCacheProxyConfiguration定义了JetCacheInterceptor、CacheAdvisor

JetCacheInterceptor

com/alicp/jetcache/anno/aop/JetCacheInterceptor.java

public class JetCacheInterceptor implements MethodInterceptor, ApplicationContextAware {

    private static final Logger logger = LoggerFactory.getLogger(JetCacheInterceptor.class);

    @Autowired
    private ConfigMap cacheConfigMap;
    private ApplicationContext applicationContext;
    private GlobalCacheConfig globalCacheConfig;
    ConfigProvider configProvider;
    CacheManager cacheManager;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public Object invoke(final MethodInvocation invocation) throws Throwable {
        if (configProvider == null) {
            configProvider = applicationContext.getBean(ConfigProvider.class);
        }
        if (configProvider != null && globalCacheConfig == null) {
            globalCacheConfig = configProvider.getGlobalCacheConfig();
        }
        if (globalCacheConfig == null || !globalCacheConfig.isEnableMethodCache()) {
            return invocation.proceed();
        }
        if (cacheManager == null) {
            cacheManager = applicationContext.getBean(CacheManager.class);
            if (cacheManager == null) {
                logger.error("There is no cache manager instance in spring context");
                return invocation.proceed();
            }
        }

        Method method = invocation.getMethod();
        Object obj = invocation.getThis();
        CacheInvokeConfig cac = null;
        if (obj != null) {
            String key = CachePointcut.getKey(method, obj.getClass());
            cac  = cacheConfigMap.getByMethodInfo(key);
        }

        /*
        if(logger.isTraceEnabled()){
            logger.trace("JetCacheInterceptor invoke. foundJetCacheConfig={}, method={}.{}(), targetClass={}",
                    cac != null,
                    method.getDeclaringClass().getName(),
                    method.getName(),
                    invocation.getThis() == null ? null : invocation.getThis().getClass().getName());
        }
        */

        if (cac == null || cac == CacheInvokeConfig.getNoCacheInvokeConfigInstance()) {
            return invocation.proceed();
        }

        CacheInvokeContext context = configProvider.newContext(cacheManager).createCacheInvokeContext(cacheConfigMap);
        context.setTargetObject(invocation.getThis());
        context.setInvoker(invocation::proceed);
        context.setMethod(method);
        context.setArgs(invocation.getArguments());
        context.setCacheInvokeConfig(cac);
        context.setHiddenPackages(globalCacheConfig.getHiddenPackages());
        return CacheHandler.invoke(context);
    }

    public void setCacheConfigMap(ConfigMap cacheConfigMap) {
        this.cacheConfigMap = cacheConfigMap;
    }

}

JetCacheInterceptor实现了aop的MethodInterceptor方法，其invoke方法先从spring中获取configProvider、globalCacheConfig，若globalCacheConfig为null或者是没有开启methodCache，则直接执行invocation.proceed()，否则获取cacheManager，然后从invocation获取key，从cacheConfigMap找到对应的CacheInvokeConfig，若为null则执行invocation.proceed()，否则通过configProvider.newContext(cacheManager).createCacheInvokeContext(cacheConfigMap)创建CacheInvokeContext，执行CacheHandler.invoke(context)

CacheHandler.invoke

com/alicp/jetcache/anno/method/CacheHandler.java

    public static Object invoke(CacheInvokeContext context) throws Throwable {
        if (context.getCacheInvokeConfig().isEnableCacheContext()) {
            try {
                CacheContextSupport._enable();
                return doInvoke(context);
            } finally {
                CacheContextSupport._disable();
            }
        } else {
            return doInvoke(context);
        }
    }

    private static Object doInvoke(CacheInvokeContext context) throws Throwable {
        CacheInvokeConfig cic = context.getCacheInvokeConfig();
        CachedAnnoConfig cachedConfig = cic.getCachedAnnoConfig();
        if (cachedConfig != null && (cachedConfig.isEnabled() || CacheContextSupport._isEnabled())) {
            return invokeWithCached(context);
        } else if (cic.getInvalidateAnnoConfigs() != null || cic.getUpdateAnnoConfig() != null) {
            return invokeWithInvalidateOrUpdate(context);
        } else {
            return invokeOrigin(context);
        }
    }   

    private static Object invokeOrigin(CacheInvokeContext context) throws Throwable {
        return context.getInvoker().invoke();
    }     

CacheHandler的invoke方法主要是执行doInvoke，它根据配置判断是走invokeWithCached、invokeWithInvalidateOrUpdate还是invokeOrigin

invokeWithCached

    private static Object invokeWithCached(CacheInvokeContext context)
            throws Throwable {
        CacheInvokeConfig cic = context.getCacheInvokeConfig();
        CachedAnnoConfig cac = cic.getCachedAnnoConfig();
        Cache cache = context.getCacheFunction().apply(context, cac);
        if (cache == null) {
            logger.error("no cache with name: " + context.getMethod());
            return invokeOrigin(context);
        }

        Object key = ExpressionUtil.evalKey(context, cic.getCachedAnnoConfig());
        if (key == null) {
            return loadAndCount(context, cache, key);
        }

        if (!ExpressionUtil.evalCondition(context, cic.getCachedAnnoConfig())) {
            return loadAndCount(context, cache, key);
        }

        try {
            CacheLoader loader = new CacheLoader() {
                @Override
                public Object load(Object k) throws Throwable {
                    Object result = invokeOrigin(context);
                    context.setResult(result);
                    return result;
                }

                @Override
                public boolean vetoCacheUpdate() {
                    return !ExpressionUtil.evalPostCondition(context, cic.getCachedAnnoConfig());
                }
            };
            Object result = cache.computeIfAbsent(key, loader);
            return result;
        } catch (CacheInvokeException e) {
            throw e.getCause();
        }
    }

invokeWithCached先获取key，若key为null或者不满足表达式则执行loadAndCount，否则执行cache.computeIfAbsent(key, loader)

loadAndCount

    private static Object loadAndCount(CacheInvokeContext context, Cache cache, Object key) throws Throwable {
        long t = System.currentTimeMillis();
        Object v = null;
        boolean success = false;
        try {
            v = invokeOrigin(context);
            success = true;
        } finally {
            t = System.currentTimeMillis() - t;
            CacheLoadEvent event = new CacheLoadEvent(cache, t, key, v, success);
            while (cache instanceof ProxyCache) {
                cache = ((ProxyCache) cache).getTargetCache();
            }
            if (cache instanceof AbstractCache) {
                ((AbstractCache) cache).notify(event);
            }
        }
        return v;
    }

loadAndCount主要是执行invokeOrigin，然后发布CacheLoadEvent事件

invokeWithInvalidateOrUpdate

    private static Object invokeWithInvalidateOrUpdate(CacheInvokeContext context) throws Throwable {
        Object originResult = invokeOrigin(context);
        context.setResult(originResult);
        CacheInvokeConfig cic = context.getCacheInvokeConfig();

        if (cic.getInvalidateAnnoConfigs() != null) {
            doInvalidate(context, cic.getInvalidateAnnoConfigs());
        }
        CacheUpdateAnnoConfig updateAnnoConfig = cic.getUpdateAnnoConfig();
        if (updateAnnoConfig != null) {
            doUpdate(context, updateAnnoConfig);
        }

        return originResult;
    }

invokeWithInvalidateOrUpdate先执行invokeOrigin，然后根据判断执行doInvalidate或者doUpdate

CacheFunction

CacheInvokeContext

com/alicp/jetcache/anno/method/CacheInvokeContext.java

    private BiFunction<CacheInvokeContext, CacheAnnoConfig, Cache> cacheFunction;

    public void setCacheFunction(BiFunction<CacheInvokeContext, CacheAnnoConfig, Cache> cacheFunction) {
        this.cacheFunction = cacheFunction;
    }

    public BiFunction<CacheInvokeContext, CacheAnnoConfig, Cache> getCacheFunction() {
        return cacheFunction;
    }

CacheInvokeContext定义了cacheFunction，是一个BiFunction，第一个参数为CacheInvokeContext，第二个参数为CacheAnnoConfig，返回类型为Cache

createCacheInvokeContext

com/alicp/jetcache/anno/support/CacheContext.java

    public CacheInvokeContext createCacheInvokeContext(ConfigMap configMap) {
        CacheInvokeContext c = newCacheInvokeContext();
        c.setCacheFunction((cic, cac) -> createOrGetCache(cic, cac, configMap));
        return c;
    }

    protected CacheInvokeContext newCacheInvokeContext() {
        return new CacheInvokeContext();
    }    

    private Cache createOrGetCache(CacheInvokeContext invokeContext, CacheAnnoConfig cacheAnnoConfig, ConfigMap configMap) {
        Cache cache = cacheAnnoConfig.getCache();
        if (cache != null) {
            return cache;
        }
        if (cacheAnnoConfig instanceof CachedAnnoConfig) {
            cache = createCacheByCachedConfig((CachedAnnoConfig) cacheAnnoConfig, invokeContext);
        } else if ((cacheAnnoConfig instanceof CacheInvalidateAnnoConfig) || (cacheAnnoConfig instanceof CacheUpdateAnnoConfig)) {
            cache = cacheManager.getCache(cacheAnnoConfig.getArea(), cacheAnnoConfig.getName());
            if (cache == null) {
                CachedAnnoConfig cac = configMap.getByCacheName(cacheAnnoConfig.getArea(), cacheAnnoConfig.getName());
                if (cac == null) {
                    String message = "can't find cache definition with area=" + cacheAnnoConfig.getArea()
                            + " name=" + cacheAnnoConfig.getName() +
                            ", specified in " + cacheAnnoConfig.getDefineMethod();
                    CacheConfigException e = new CacheConfigException(message);
                    logger.error("Cache operation aborted because can't find cached definition", e);
                    return null;
                }
                cache = createCacheByCachedConfig(cac, invokeContext);
            }
        }
        cacheAnnoConfig.setCache(cache);
        return cache;
    } 

    private Cache createCacheByCachedConfig(CachedAnnoConfig ac, CacheInvokeContext invokeContext) {
        String area = ac.getArea();
        String cacheName = ac.getName();
        if (CacheConsts.isUndefined(cacheName)) {

            cacheName = configProvider.createCacheNameGenerator(invokeContext.getHiddenPackages())
                    .generateCacheName(invokeContext.getMethod(), invokeContext.getTargetObject());
        }
        Cache cache = __createOrGetCache(ac, area, cacheName);
        return cache;
    }

    public Cache __createOrGetCache(CachedAnnoConfig cac, String area, String cacheName) {
        QuickConfig.Builder b = QuickConfig.newBuilder(area, cacheName);
        TimeUnit timeUnit = cac.getTimeUnit();
        if (cac.getExpire() > 0) {
            b.expire(Duration.ofMillis(timeUnit.toMillis(cac.getExpire())));
        }
        if (cac.getLocalExpire() > 0) {
            b.localExpire(Duration.ofMillis(timeUnit.toMillis(cac.getLocalExpire())));
        }
        if (cac.getLocalLimit() > 0) {
            b.localLimit(cac.getLocalLimit());
        }
        b.cacheType(cac.getCacheType());
        b.syncLocal(cac.isSyncLocal());
        if (!CacheConsts.isUndefined(cac.getKeyConvertor())) {
            b.keyConvertor(configProvider.parseKeyConvertor(cac.getKeyConvertor()));
        }
        if (!CacheConsts.isUndefined(cac.getSerialPolicy())) {
            b.valueEncoder(configProvider.parseValueEncoder(cac.getSerialPolicy()));
            b.valueDecoder(configProvider.parseValueDecoder(cac.getSerialPolicy()));
        }
        b.cacheNullValue(cac.isCacheNullValue());
        b.useAreaInPrefix(globalCacheConfig.isAreaInCacheName());
        PenetrationProtectConfig ppc = cac.getPenetrationProtectConfig();
        if (ppc != null) {
            b.penetrationProtect(ppc.isPenetrationProtect());
            b.penetrationProtectTimeout(ppc.getPenetrationProtectTimeout());
        }
        b.refreshPolicy(cac.getRefreshPolicy());
        return cacheManager.getOrCreateCache(b.build());
    }           

createCacheInvokeContext方法会设置cacheFunction为(cic, cac) -> createOrGetCache(cic, cac, configMap)，通过createOrGetCache来创建或者获取Cache；createOrGetCache从cacheAnnoConfig.getCache()获取Cache，不为null则返回，为null则通过createCacheByCachedConfig来创建，其最后是创建QuickConfig，然后通过cacheManager.getOrCreateCache(b.build())来创建Cache

CacheAdvisor

com/alicp/jetcache/anno/aop/CacheAdvisor.java

public class CacheAdvisor extends AbstractBeanFactoryPointcutAdvisor {

    public static final String CACHE_ADVISOR_BEAN_NAME = "jetcache2.internalCacheAdvisor";

    @Autowired
    private ConfigMap cacheConfigMap;

    private String[] basePackages;

    @Override
    public Pointcut getPointcut() {
        CachePointcut pointcut = new CachePointcut(basePackages);
        pointcut.setCacheConfigMap(cacheConfigMap);
        return pointcut;
    }

    public void setCacheConfigMap(ConfigMap cacheConfigMap) {
        this.cacheConfigMap = cacheConfigMap;
    }

    public void setBasePackages(String[] basePackages) {
        this.basePackages = basePackages;
    }
}

CacheAdvisor继承了spring的AbstractBeanFactoryPointcutAdvisor，其getPointcut返回的是CachePointcut

CachePointcut

com/alicp/jetcache/anno/aop/CachePointcut.java

public class CachePointcut extends StaticMethodMatcherPointcut implements ClassFilter {

    private static final Logger logger = LoggerFactory.getLogger(CachePointcut.class);

    private ConfigMap cacheConfigMap;
    private String[] basePackages;

    public CachePointcut(String[] basePackages) {
        setClassFilter(this);
        this.basePackages = basePackages;
    }

    @Override
    public boolean matches(Class clazz) {
        boolean b = matchesImpl(clazz);
        logger.trace("check class match {}: {}", b, clazz);
        return b;
    }

    private boolean matchesImpl(Class clazz) {
        if (matchesThis(clazz)) {
            return true;
        }
        Class[] cs = clazz.getInterfaces();
        if (cs != null) {
            for (Class c : cs) {
                if (matchesImpl(c)) {
                    return true;
                }
            }
        }
        if (!clazz.isInterface()) {
            Class sp = clazz.getSuperclass();
            if (sp != null && matchesImpl(sp)) {
                return true;
            }
        }
        return false;
    }

    public boolean matchesThis(Class clazz) {
        String name = clazz.getName();
        if (exclude(name)) {
            return false;
        }
        return include(name);
    }

    private boolean include(String name) {
        if (basePackages != null) {
            for (String p : basePackages) {
                if (name.startsWith(p)) {
                    return true;
                }
            }
        }
        return false;
    }

    private boolean exclude(String name) {
        if (name.startsWith("java")) {
            return true;
        }
        if (name.startsWith("org.springframework")) {
            return true;
        }
        if (name.indexOf("$$EnhancerBySpringCGLIB$$") >= 0) {
            return true;
        }
        if (name.indexOf("$$FastClassBySpringCGLIB$$") >= 0) {
            return true;
        }
        return false;
    }

    @Override
    public boolean matches(Method method, Class targetClass) {
        boolean b = matchesImpl(method, targetClass);
        if (b) {
            if (logger.isDebugEnabled()) {
                logger.debug("check method match true: method={}, declaringClass={}, targetClass={}",
                        method.getName(),
                        ClassUtil.getShortClassName(method.getDeclaringClass().getName()),
                        targetClass == null ? null : ClassUtil.getShortClassName(targetClass.getName()));
            }
        } else {
            if (logger.isTraceEnabled()) {
                logger.trace("check method match false: method={}, declaringClass={}, targetClass={}",
                        method.getName(),
                        ClassUtil.getShortClassName(method.getDeclaringClass().getName()),
                        targetClass == null ? null : ClassUtil.getShortClassName(targetClass.getName()));
            }
        }
        return b;
    }

    private boolean matchesImpl(Method method, Class targetClass) {
        if (!matchesThis(method.getDeclaringClass())) {
            return false;
        }
        if (exclude(targetClass.getName())) {
            return false;
        }
        String key = getKey(method, targetClass);
        CacheInvokeConfig cac = cacheConfigMap.getByMethodInfo(key);
        if (cac == CacheInvokeConfig.getNoCacheInvokeConfigInstance()) {
            return false;
        } else if (cac != null) {
            return true;
        } else {
            cac = new CacheInvokeConfig();
            CacheConfigUtil.parse(cac, method);

            String name = method.getName();
            Class<?>[] paramTypes = method.getParameterTypes();
            parseByTargetClass(cac, targetClass, name, paramTypes);

            if (!cac.isEnableCacheContext() && cac.getCachedAnnoConfig() == null &&
                    cac.getInvalidateAnnoConfigs() == null && cac.getUpdateAnnoConfig() == null) {
                cacheConfigMap.putByMethodInfo(key, CacheInvokeConfig.getNoCacheInvokeConfigInstance());
                return false;
            } else {
                cacheConfigMap.putByMethodInfo(key, cac);
                return true;
            }
        }
    }

    public static String getKey(Method method, Class targetClass) {
        StringBuilder sb = new StringBuilder();
        sb.append(method.getDeclaringClass().getName());
        sb.append('.');
        sb.append(method.getName());
        sb.append(Type.getMethodDescriptor(method));
        if (targetClass != null) {
            sb.append('_');
            sb.append(targetClass.getName());
        }
        return sb.toString();
    }

    private void parseByTargetClass(CacheInvokeConfig cac, Class<?> clazz, String name, Class<?>[] paramTypes) {
        if (!clazz.isInterface() && clazz.getSuperclass() != null) {
            parseByTargetClass(cac, clazz.getSuperclass(), name, paramTypes);
        }
        Class<?>[] intfs = clazz.getInterfaces();
        for (Class<?> it : intfs) {
            parseByTargetClass(cac, it, name, paramTypes);
        }

        boolean matchThis = matchesThis(clazz);
        if (matchThis) {
            Method[] methods = clazz.getDeclaredMethods();
            for (Method method : methods) {
                if (methodMatch(name, method, paramTypes)) {
                    CacheConfigUtil.parse(cac, method);
                    break;
                }
            }
        }
    }

    private boolean methodMatch(String name, Method method, Class<?>[] paramTypes) {
        if (!Modifier.isPublic(method.getModifiers())) {
            return false;
        }
        if (!name.equals(method.getName())) {
            return false;
        }
        Class<?>[] ps = method.getParameterTypes();
        if (ps.length != paramTypes.length) {
            return false;
        }
        for (int i = 0; i < ps.length; i++) {
            if (!ps[i].equals(paramTypes[i])) {
                return false;
            }
        }
        return true;
    }


    public void setCacheConfigMap(ConfigMap cacheConfigMap) {
        this.cacheConfigMap = cacheConfigMap;
    }
}

CachePointcut继承了spring的StaticMethodMatcherPointcut，其matches方法委托给了matchesImpl，它主要是通过cacheConfigMap.getByMethodInfo(key)来获取CacheInvokeConfig，如果是noCacheInvokeConfigInstance则返回false，若不为null则返回true，若为null则创建CacheInvokeConfig维护到cacheConfigMap中

CommonConfiguration

com/alicp/jetcache/anno/config/CommonConfiguration.java

@Configuration
public class CommonConfiguration {
    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public ConfigMap jetcacheConfigMap() {
        return new ConfigMap();
    }
}

CommonConfiguration创建ConfigMap实例

小结

JetCacheProxyConfiguration主要是定义了JetCacheInterceptor、CacheAdvisor，其中JetCacheInterceptor实现了aop的MethodInterceptor方法，其invoke方法主要是通过configProvider.newContext(cacheManager).createCacheInvokeContext(cacheConfigMap)创建CacheInvokeContext，执行CacheHandler.invoke(context)通过context.getCacheFunction().apply(context, cac)获取com.alicp.jetcache.Cache，然后进行相关操作；CachePointcut继承了spring的StaticMethodMatcherPointcut，其matches方法委托给了matchesImpl，它主要是通过cacheConfigMap.getByMethodInfo(key)来获取CacheInvokeConfig，如果是noCacheInvokeConfigInstance则返回false，若不为null则返回true，若为null则创建CacheInvokeConfig维护到cacheConfigMap中。

doc

• jetcache