一、UML类图分析说明

如下图定义Sar微服务组件的完整的类之间依赖关系图，核心类SARContextBean，其中通过其组成的成员类加载器、基础SARAttrs、上下文ServletContext/SpringContext及分发器Dispatcher主要部分

关于组件SAR提供了独立的配置文件、类加载器、Spring容器及热部署和热插拔的基本特征属性

二、核心类代码

1. 主要核心类SARContextBean，完成所有组件定义实现，具体代码如下所示

import com.xwood.woopa.app.biz.ac.ApplicationController;@b@import com.xwood.woopa.app.biz.ac.ApplicationControllerException;@b@import com.xwood.woopa.app.dto.ServiceRequest;@b@import com.xwood.woopa.app.dto.ServiceResponse;@b@import com.xwood.woopa.papp.PAppException;@b@import com.xwood.woopa.papp.esa.ESADefinition;@b@import com.xwood.woopa.papp.sar.context.SARSpringContextFactory;@b@import com.xwood.woopa.papp.sar.event.SARShutdownEvent;@b@import com.xwood.woopa.papp.sar.event.SARStartupedEvent;@b@import com.xwood.woopa.papp.web.WebDispatcher;@b@import com.xwood.woopa.pizza.classloader.ClassLoaderStack;@b@import java.rmi.RemoteException;@b@import java.util.Collection;@b@import java.util.concurrent.locks.Lock;@b@import java.util.concurrent.locks.ReentrantLock;@b@import javax.servlet.ServletContext;@b@import javax.servlet.ServletException;@b@import javax.servlet.http.HttpServletRequest;@b@import javax.servlet.http.HttpServletResponse;@b@import org.apache.commons.logging.Log;@b@import org.apache.commons.logging.LogFactory;@b@import org.springframework.context.ConfigurableApplicationContext;@b@import org.springframework.core.Ordered;@b@@b@public final class SARContextBean@b@  implements SARContext, Ordered@b@{@b@  private String sarName;@b@  private volatile SARAttrs attrs;@b@  private volatile ConfigurableApplicationContext springContext;@b@  private volatile SARDispatcher dispatcher;@b@  private volatile ClassLoader classLoader;@b@  private volatile ConfigurableApplicationContext pappSpringContext;@b@  private volatile boolean running;@b@  private volatile WebDispatcher webDispatcher;@b@  private volatile ServletContext servletContext;@b@  private final Lock lock = new ReentrantLock();@b@  private Log logger = LogFactory.getLog(super.getClass());@b@@b@  public SARContextBean(SARAttrs attrs, ClassLoader classLoader, ConfigurableApplicationContext pappSpringContext, ServletContext servletContext)@b@  {@b@    this.attrs = attrs;@b@    this.sarName = attrs.getSarName();@b@    this.pappSpringContext = pappSpringContext;@b@    this.classLoader = classLoader;@b@    this.servletContext = servletContext;@b@  }@b@@b@  public boolean isRunning()@b@  {@b@    return this.running;@b@  }@b@@b@  public String getSARName()@b@  {@b@    return this.sarName;@b@  }@b@@b@  public boolean startup()@b@  {@b@    String sarName = this.sarName;@b@    this.lock.lock();@b@    try {@b@      if (this.running) {@b@        throw new PAppException("SAR:" + sarName + " be running.");@b@      }@b@@b@      if (this.logger.isInfoEnabled())@b@        this.logger.info("SAR<" + sarName + ">startup...");@b@@b@      long t1 = System.nanoTime();@b@@b@      Thread.currentThread().setContextClassLoader(this.classLoader);@b@@b@      SARSpringContextFactory context = new SARSpringContextFactory();@b@      this.springContext = context.create(this.pappSpringContext, this.classLoader, this.attrs, this.servletContext);@b@@b@      this.dispatcher = context.getDispatcher();@b@      this.webDispatcher = context.getWebDispatcher();@b@@b@      SARStartupedEvent event = new SARStartupedEvent(this);@b@@b@      this.springContext.publishEvent(event);@b@      if (this.logger.isInfoEnabled()) {@b@        this.logger.info("SAR<" + sarName + ">startup completed, times=" + ((System.nanoTime() - t1) / 1000L / 1000.0D) + "ms.");@b@      }@b@@b@      this.running = true;@b@    } catch (Throwable th) {@b@      this.logger.error("SAR<" + sarName + ">startup failed,cause:\n" + th.getLocalizedMessage(), th);@b@@b@      this.running = false;@b@    } finally {@b@      this.lock.unlock();@b@    }@b@    return this.running;@b@  }@b@@b@  public void shutdown() {@b@    this.lock.lock();@b@    try {@b@      innerShutdown();@b@    } finally {@b@      this.running = false;@b@      this.lock.unlock();@b@    }@b@  }@b@@b@  public Collection<ESADefinition> getESADefinitions()@b@  {@b@    if (this.dispatcher != null)@b@      return this.dispatcher.getESADefinitions();@b@@b@    return null;@b@  }@b@@b@  protected void innerShutdown() {@b@    String sarName = this.sarName;@b@    if (this.logger.isInfoEnabled())@b@      this.logger.info("SAR<" + sarName + ">shutdown now.");@b@@b@    if (this.springContext != null) {@b@      SARShutdownEvent event = new SARShutdownEvent(this);@b@@b@      this.springContext.publishEvent(event);@b@    }@b@    try {@b@      if (this.springContext != null)@b@        this.springContext.close();@b@    }@b@    catch (Throwable th) {@b@      this.logger.error("SAR<" + sarName + ">shutdown error,cause:\n" + th.getLocalizedMessage(), th);@b@    }@b@@b@    this.webDispatcher = null;@b@    this.dispatcher = null;@b@    this.classLoader = null;@b@    this.pappSpringContext = null;@b@    if (this.logger.isInfoEnabled())@b@      this.logger.info("SAR<" + sarName + ">shutdown completed.");@b@  }@b@@b@  public boolean handleWebRequest(HttpServletRequest request, HttpServletResponse response)@b@    throws ServletException@b@  {@b@    try@b@    {@b@      if (this.classLoader != null)@b@        ClassLoaderStack.push(this.classLoader);@b@@b@      int i = ((this.webDispatcher != null) && (this.webDispatcher.handleRequest(request, response))) ? 1 : 0;@b@@b@      return i;@b@    }@b@    finally@b@    {@b@      if (this.classLoader != null)@b@        ClassLoaderStack.pop();@b@    }@b@  }@b@@b@  public ServiceResponse handleRequest(ServiceRequest request)@b@    throws ApplicationControllerException, RemoteException@b@  {@b@    try@b@    {@b@      if (this.classLoader != null)@b@        ClassLoaderStack.push(this.classLoader);@b@@b@      ServiceResponse localServiceResponse = getDispatcher().handleRequest(request);@b@@b@      return localServiceResponse;@b@    }@b@    finally@b@    {@b@      if (this.classLoader != null)@b@        ClassLoaderStack.pop();@b@    }@b@  }@b@@b@  public ConfigurableApplicationContext getSpringContext()@b@  {@b@    return this.springContext;@b@  }@b@@b@  public ApplicationController getDispatcher() {@b@    return this.dispatcher;@b@  }@b@@b@  public WebDispatcher getWebDispatcher() {@b@    return this.webDispatcher;@b@  }@b@@b@  public int getOrder()@b@  {@b@    return this.attrs.getOrder();@b@  }@b@}

2. 工厂类SARContextFactoryBean，代码如下所示

import com.xwood.woopa.papp.lib.HomeDirectory;@b@import com.xwood.woopa.papp.sar.lib.SARClassLoaderFactory;@b@import com.xwood.woopa.pizza.utils.PizzaProperties;@b@import javax.servlet.ServletContext;@b@import org.apache.commons.logging.Log;@b@import org.apache.commons.logging.LogFactory;@b@import org.springframework.beans.BeansException;@b@import org.springframework.context.ApplicationContext;@b@import org.springframework.context.ApplicationContextAware;@b@import org.springframework.context.ConfigurableApplicationContext;@b@import org.springframework.web.context.ServletContextAware;@b@@b@public class SARContextFactoryBean@b@  implements SARContextFactory, ApplicationContextAware, ServletContextAware@b@{@b@  private static final String KEY_PREFIX_CONFIG = ".properties";@b@  private HomeDirectory pappHomeDirectory;@b@  private ConfigurableApplicationContext pappSpringContext;@b@  private Log logger;@b@  private ServletContext servletContext;@b@@b@  public SARContextFactoryBean()@b@  {@b@    this.logger = LogFactory.getLog(super.getClass());@b@  }@b@@b@  public SARContext create(String sarName) {@b@    PizzaProperties properties = new PizzaProperties("sar/" + sarName + ".properties");@b@@b@    if (this.logger.isInfoEnabled()) {@b@      this.logger.info("SAR:" + sarName + " configure properties=" + properties);@b@    }@b@@b@    SARAttrs attrs = new SARAttrs(sarName, properties);@b@    SARClassLoaderFactory classloaderFactory = new SARClassLoaderFactory(attrs, this.pappHomeDirectory.getRootDirectory());@b@@b@    ClassLoader classLoader = classloaderFactory.createClassLoader(this.pappSpringContext.getClassLoader());@b@@b@    return new SARContextBean(attrs, classLoader, this.pappSpringContext, this.servletContext);@b@  }@b@@b@  public void setApplicationContext(ApplicationContext applicationContext)@b@    throws BeansException@b@  {@b@    this.pappSpringContext = ((ConfigurableApplicationContext)applicationContext);@b@  }@b@@b@  public HomeDirectory getPappHomeDirectory() {@b@    return this.pappHomeDirectory;@b@  }@b@@b@  public void setPappHomeDirectory(HomeDirectory pappHomeDirectory) {@b@    this.pappHomeDirectory = pappHomeDirectory;@b@  }@b@@b@  public void setServletContext(ServletContext servletContext)@b@  {@b@    this.servletContext = servletContext;@b@  }@b@}