Enhance to reuse duplicate spring beans to reduce memory usage.

bootstrap/src/main/java/com/alibaba/nacos/bootstrap/NacosBootstrap.java

@@ -27,6 +27,8 @@
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.io.ClassPathResource;
+import org.springframework.jmx.support.MBeanRegistrationSupport;
+import org.springframework.jmx.support.RegistrationPolicy;
 
 /**
  * Nacos bootstrap class.
@@ -38,6 +40,7 @@ public class NacosBootstrap {
 
     public static void main(String[] args) {
         ConfigurableApplicationContext coreContext = startCoreContext(args);
+        coreContext.getBean(MBeanRegistrationSupport.class).setRegistrationPolicy(RegistrationPolicy.IGNORE_EXISTING);
         String type = coreContext.getEnvironment()
                 .getProperty(Constants.NACOS_DEPLOYMENT_TYPE, Constants.NACOS_DEPLOYMENT_TYPE_MERGED);
         if (Constants.NACOS_DEPLOYMENT_TYPE_MERGED.equals(type)) {

console/src/main/java/com/alibaba/nacos/console/config/NacosConsoleBeanPostProcessorConfiguration.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 1999-2023 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.console.config;
+
+import com.alibaba.nacos.core.web.NacosWebBean;
+import com.alibaba.nacos.sys.env.Constants;
+import com.alibaba.nacos.sys.env.NacosDuplicateConfigurationBeanPostProcessor;
+import com.alibaba.nacos.sys.env.NacosDuplicateSpringBeanPostProcessor;
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Bean Post Processor Configuration for nacos console.
+ *
+ * @author xiweng.yy
+ */
+@Configuration
+@NacosWebBean
+@ConditionalOnProperty(value = Constants.NACOS_DUPLICATE_BEAN_ENHANCEMENT_ENABLED, havingValue = "true", matchIfMissing = true)
+public class NacosConsoleBeanPostProcessorConfiguration {
+
+    @Bean
+    public InstantiationAwareBeanPostProcessor nacosDuplicateSpringBeanPostProcessor(
+            ConfigurableApplicationContext context) {
+        return new NacosDuplicateSpringBeanPostProcessor(context);
+    }
+
+    @Bean
+    public InstantiationAwareBeanPostProcessor nacosDuplicateConfigurationBeanPostProcessor(
+            ConfigurableApplicationContext context) {
+        return new NacosDuplicateConfigurationBeanPostProcessor(context);
+    }
+}

prometheus/src/main/java/com/alibaba/nacos/prometheus/conf/PrometheusSecurityConfiguration.java

@@ -16,6 +16,7 @@
 
 package com.alibaba.nacos.prometheus.conf;
 
+import com.alibaba.nacos.core.web.NacosWebBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityCustomizer;
@@ -31,6 +32,7 @@
  * @author vividfish
  */
 @Configuration
+@NacosWebBean
 public class PrometheusSecurityConfiguration {
 
     @Bean

server/src/main/java/com/alibaba/nacos/NacosServerWebApplication.java

@@ -18,6 +18,7 @@
 
 import com.alibaba.nacos.server.NacosNormalBeanTypeFilter;
 import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.AutoConfigurationExcludeFilter;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.ComponentScan.Filter;
@@ -29,10 +30,11 @@
  *
  * @author xiweng.yy
  */
-@SpringBootApplication
+@SpringBootApplication()
 @ComponentScan(basePackages = "com.alibaba.nacos", excludeFilters = {
         @Filter(type = FilterType.REGEX, pattern = "com\\.alibaba\\.nacos\\.console.*"),
-        @Filter(type = FilterType.CUSTOM, classes = {NacosNormalBeanTypeFilter.class})})
+        @Filter(type = FilterType.CUSTOM, classes = {NacosNormalBeanTypeFilter.class,
+                AutoConfigurationExcludeFilter.class})})
 @PropertySource("classpath:nacos-server.properties")
 public class NacosServerWebApplication {
 

server/src/main/java/com/alibaba/nacos/server/NacosWebBeanPostProcessorConfiguration.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 1999-2023 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.server;
+
+import com.alibaba.nacos.core.web.NacosWebBean;
+import com.alibaba.nacos.sys.env.Constants;
+import com.alibaba.nacos.sys.env.NacosDuplicateConfigurationBeanPostProcessor;
+import com.alibaba.nacos.sys.env.NacosDuplicateSpringBeanPostProcessor;
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Bean Post Processor Configuration for nacos web server.
+ *
+ * @author xiweng.yy
+ */
+@Configuration
+@NacosWebBean
+@ConditionalOnProperty(value = Constants.NACOS_DUPLICATE_BEAN_ENHANCEMENT_ENABLED, havingValue = "true", matchIfMissing = true)
+public class NacosWebBeanPostProcessorConfiguration {
+
+    @Bean
+    public InstantiationAwareBeanPostProcessor nacosDuplicateSpringBeanPostProcessor(
+            ConfigurableApplicationContext context) {
+        return new NacosDuplicateSpringBeanPostProcessor(context);
+    }
+
+    @Bean
+    public InstantiationAwareBeanPostProcessor nacosDuplicateConfigurationBeanPostProcessor(
+            ConfigurableApplicationContext context) {
+        return new NacosDuplicateConfigurationBeanPostProcessor(context);
+    }
+}

server/src/main/resources/nacos-server.properties

@@ -16,4 +16,5 @@
 
 ### nacos console port:
 server.port=${nacos.server.main.port:8080}
-server.servlet.contextPath=${nacos.server.contextPath:/nacos}
+server.servlet.contextPath=${nacos.server.contextPath:/nacos}
+spring.sql.init.mode=never

sys/src/main/java/com/alibaba/nacos/sys/env/AbstractNacosDuplicateBeanPostProcessor.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 1999-2023 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.sys.env;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
+import org.springframework.context.ConfigurableApplicationContext;
+
+/**
+ * Abstract Nacos Duplicate Bean Post Processor of {@link InstantiationAwareBeanPostProcessor} to reduce duplicate rebuild bean for spring beans.
+ *
+ * @author xiweng.yy
+ */
+public abstract class AbstractNacosDuplicateBeanPostProcessor implements InstantiationAwareBeanPostProcessor {
+
+    private final ConfigurableApplicationContext coreContext;
+
+    protected AbstractNacosDuplicateBeanPostProcessor(ConfigurableApplicationContext context) {
+        coreContext = null == context.getParent() ? context : (ConfigurableApplicationContext) context.getParent();
+    }
+
+    @Override
+    public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException {
+        if (!coreContext.containsBean(beanName)) {
+            return null;
+        }
+        BeanDefinition beanDefinition = coreContext.getBeanFactory().getBeanDefinition(beanName);
+        return isReUsingBean(beanClass, beanName, beanDefinition) ? coreContext.getBean(beanName) : null;
+    }
+
+    /**
+     * Judge whether re-use beans from core context.
+     *
+     * @param beanClass bean class
+     * @param beanName bean name
+     * @param beanDefinition bean definition
+     * @return {@code true} means re-use beans from core context, otherwise {@code false} means to re-build bean in sub context.
+     */
+    protected abstract boolean isReUsingBean(Class<?> beanClass, String beanName, BeanDefinition beanDefinition);
+}

sys/src/main/java/com/alibaba/nacos/sys/env/Constants.java

@@ -89,4 +89,6 @@ public interface Constants {
     String NACOS_DEPLOYMENT_TYPE_SERVER = "server";
 
     String NACOS_DEPLOYMENT_TYPE_CONSOLE = "console";
+
+    String NACOS_DUPLICATE_BEAN_ENHANCEMENT_ENABLED = "nacos.sys.duplicate.bean.enhancement.enabled";
 }

sys/src/main/java/com/alibaba/nacos/sys/env/NacosDuplicateConfigurationBeanPostProcessor.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 1999-2023 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.sys.env;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Nacos {@link InstantiationAwareBeanPostProcessor} to reduce duplicate rebuild bean for spring configuration.
+ *
+ * @author xiweng.yy
+ */
+public class NacosDuplicateConfigurationBeanPostProcessor extends AbstractNacosDuplicateBeanPostProcessor {
+
+    public NacosDuplicateConfigurationBeanPostProcessor(ConfigurableApplicationContext context) {
+        super(context);
+    }
+
+    @Override
+    protected boolean isReUsingBean(Class<?> beanClass, String beanName, BeanDefinition beanDefinition) {
+        return isConfiguration(beanClass);
+    }
+
+    private boolean isConfiguration(Class<?> beanClass) {
+        return null != beanClass.getAnnotation(Configuration.class) || null != beanClass.getAnnotation(
+                AutoConfiguration.class);
+    }
+}

sys/src/main/java/com/alibaba/nacos/sys/env/NacosDuplicateSpringBeanPostProcessor.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 1999-2023 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.sys.env;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
+import org.springframework.context.ConfigurableApplicationContext;
+
+/**
+ * Nacos {@link InstantiationAwareBeanPostProcessor} to reduce duplicate rebuild bean for spring beans.
+ *
+ * <p>
+ *     For some important spring beans like spring context beans, if reuse from parent, will cause some problem. So skip.
+ * </p>
+ *
+ * @author xiweng.yy
+ */
+public class NacosDuplicateSpringBeanPostProcessor extends AbstractNacosDuplicateBeanPostProcessor {
+
+    public NacosDuplicateSpringBeanPostProcessor(ConfigurableApplicationContext context) {
+        super(context);
+    }
+
+    @Override
+    protected boolean isReUsingBean(Class<?> beanClass, String beanName, BeanDefinition beanDefinition) {
+        return !isContextBean(beanClass);
+    }
+
+    private boolean isContextBean(Class<?> beanClass) {
+        return isContextClass(beanClass.getCanonicalName());
+    }
+
+    private boolean isContextClass(String beanClassName) {
+        return beanClassName.startsWith("org.springframework.context")
+                || beanClassName.startsWith("org.springframework.boot.context");
+    }
+}