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// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// 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.cloud.utils.component;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.management.InstanceAlreadyExistsException;
import javax.management.MBeanRegistrationException;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.naming.ConfigurationException;
import org.apache.log4j.Logger;
import org.springframework.aop.framework.Advised;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import com.cloud.utils.mgmt.JmxUtil;
import com.cloud.utils.mgmt.ManagementBean;
/**
*
* ComponentContext.setApplication() and ComponentContext.getApplication()
* are not recommended to be used outside, they exist to help wire Spring Framework
*
*/
@Component
public class ComponentContext implements ApplicationContextAware {
private static final Logger s_logger = Logger.getLogger(ComponentContext.class);
private static ApplicationContext s_appContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
s_logger.info("Setup Spring Application context");
s_appContext = applicationContext;
}
public static ApplicationContext getApplicationContext() {
return s_appContext;
}
public static void initComponentsLifeCycle() {
AutowireCapableBeanFactory beanFactory = s_appContext.getAutowireCapableBeanFactory();
Map<String, ComponentMethodInterceptable> interceptableComponents = getApplicationContext().getBeansOfType(
ComponentMethodInterceptable.class);
for(Map.Entry<String, ComponentMethodInterceptable> entry : interceptableComponents.entrySet()) {
Object bean = getTargetObject(entry.getValue());
beanFactory.configureBean(bean, entry.getKey());
}
Map<String, ComponentLifecycle> lifecyleComponents = getApplicationContext().getBeansOfType(ComponentLifecycle.class);
Map[] classifiedComponents = new Map[ComponentLifecycle.MAX_RUN_LEVELS];
for(int i = 0; i < ComponentLifecycle.MAX_RUN_LEVELS; i++) {
classifiedComponents[i] = new HashMap<String, ComponentLifecycle>();
}
for(Map.Entry<String, ComponentLifecycle> entry : lifecyleComponents.entrySet()) {
classifiedComponents[entry.getValue().getRunLevel()].put(entry.getKey(), entry.getValue());
}
// Run the SystemIntegrityCheckers first
Map<String, SystemIntegrityChecker> integrityCheckers = getApplicationContext().getBeansOfType(SystemIntegrityChecker.class);
for (Entry<String,SystemIntegrityChecker> entry : integrityCheckers.entrySet() ){
s_logger.info ("Running SystemIntegrityChecker " + entry.getKey());
try {
entry.getValue().check();
} catch(Throwable e) {
s_logger.error("System integrity check failed. Refuse to startup");
System.exit(1);
}
}
// configuration phase
Map<String, String> avoidMap = new HashMap<String, String>();
for(int i = 0; i < ComponentLifecycle.MAX_RUN_LEVELS; i++) {
for(Map.Entry<String, ComponentLifecycle> entry : ((Map<String, ComponentLifecycle>)classifiedComponents[i]).entrySet()) {
ComponentLifecycle component = entry.getValue();
String implClassName = ComponentContext.getTargetClass(component).getName();
s_logger.info("Configuring " + implClassName);
if(avoidMap.containsKey(implClassName)) {
s_logger.info("Skip configuration of " + implClassName + " as it is already configured");
continue;
}
try {
component.configure(component.getName(), component.getConfigParams());
} catch (ConfigurationException e) {
s_logger.error("Unhandled exception", e);
throw new RuntimeException("Unable to configure " + implClassName, e);
}
avoidMap.put(implClassName, implClassName);
}
}
// starting phase
avoidMap.clear();
for(int i = 0; i < ComponentLifecycle.MAX_RUN_LEVELS; i++) {
for(Map.Entry<String, ComponentLifecycle> entry : ((Map<String, ComponentLifecycle>)classifiedComponents[i]).entrySet()) {
ComponentLifecycle component = entry.getValue();
String implClassName = ComponentContext.getTargetClass(component).getName();
s_logger.info("Starting " + implClassName);
if(avoidMap.containsKey(implClassName)) {
s_logger.info("Skip configuration of " + implClassName + " as it is already configured");
continue;
}
try {
component.start();
if(getTargetObject(component) instanceof ManagementBean)
registerMBean((ManagementBean)getTargetObject(component));
} catch (Exception e) {
s_logger.error("Unhandled exception", e);
throw new RuntimeException("Unable to start " + implClassName, e);
}
avoidMap.put(implClassName, implClassName);
}
}
}
static void registerMBean(ManagementBean mbean) {
try {
JmxUtil.registerMBean(mbean);
} catch (MalformedObjectNameException e) {
s_logger.warn("Unable to register MBean: " + mbean.getName(), e);
} catch (InstanceAlreadyExistsException e) {
s_logger.warn("Unable to register MBean: " + mbean.getName(), e);
} catch (MBeanRegistrationException e) {
s_logger.warn("Unable to register MBean: " + mbean.getName(), e);
} catch (NotCompliantMBeanException e) {
s_logger.warn("Unable to register MBean: " + mbean.getName(), e);
}
s_logger.info("Registered MBean: " + mbean.getName());
}
public static <T> T getComponent(String name) {
assert(s_appContext != null);
return (T)s_appContext.getBean(name);
}
public static <T> T getComponent(Class<T> beanType) {
assert(s_appContext != null);
Map<String, T> matchedTypes = getComponentsOfType(beanType);
if(matchedTypes.size() > 0) {
for(Map.Entry<String, T> entry : matchedTypes.entrySet()) {
Primary primary = getTargetClass(entry.getValue()).getAnnotation(Primary.class);
if(primary != null)
return entry.getValue();
}
if(matchedTypes.size() > 1) {
s_logger.warn("Unable to uniquely locate bean type " + beanType.getName());
for(Map.Entry<String, T> entry : matchedTypes.entrySet()) {
s_logger.warn("Candidate " + getTargetClass(entry.getValue()).getName());
}
}
return (T)matchedTypes.values().toArray()[0];
}
throw new NoSuchBeanDefinitionException(beanType.getName());
}
public static <T> Map<String, T> getComponentsOfType(Class<T> beanType) {
return s_appContext.getBeansOfType(beanType);
}
public static Class<?> getTargetClass(Object instance) {
while(instance instanceof Advised) {
try {
instance = ((Advised)instance).getTargetSource().getTarget();
} catch(Exception e) {
return instance.getClass();
}
}
return instance.getClass();
}
public static <T> T getTargetObject(Object instance) {
while(instance instanceof Advised) {
try {
instance = ((Advised)instance).getTargetSource().getTarget();
} catch (Exception e) {
return (T)instance;
}
}
return (T)instance;
}
public static <T> T inject(Class<T> clz) {
T instance;
try {
instance = clz.newInstance();
return inject(instance);
} catch (InstantiationException e) {
s_logger.error("Unhandled InstantiationException", e);
throw new RuntimeException("Unable to instantiate object of class " + clz.getName() + ", make sure it has public constructor");
} catch (IllegalAccessException e) {
s_logger.error("Unhandled IllegalAccessException", e);
throw new RuntimeException("Unable to instantiate object of class " + clz.getName() + ", make sure it has public constructor");
}
}
public static <T> T inject(Object instance) {
// autowire dynamically loaded object
AutowireCapableBeanFactory beanFactory = s_appContext.getAutowireCapableBeanFactory();
beanFactory.autowireBean(instance);
return (T)instance;
}
}