cacheservlet.java

来自「JAVA Servlet2.3外文书籍源码」· Java 代码 · 共 52 行

package cache;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;

public class CacheServlet extends HttpServlet {

  public void init(ServletConfig config) throws ServletException {
    super.init(config);

    ICacheManager manager = CacheManagerImpl.getInstance();
    System.out.println("");
    System.out.println("Cache manager retrieved");

    ICache cache = new SimpleCacheImpl();
    cache.setName("employeeCache");
    cache.setSize(10);
    System.out.println("Cache created");

    manager.addCache(cache);
    System.out.println("Cache added");

    cache.addCacheable(new Employee("123", "Meeraj"));
    System.out.println("Object added to cache");
  }
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
                    throws ServletException, IOException {
    ICacheManager manager = CacheManagerImpl.getInstance();
    System.out.println("");
    System.out.println("Cache manager retrieved");
      
    ICache cache = manager.getCache("employeeCache");
    System.out.println("Cache retrieved");

    Employee emp = (Employee)cache.getCacheable("123");

    if(emp == null) {
      //return the employee from the database and add it to the cache
    }

    System.out.println("Employee "+emp.getName()+" retrieved from cache");
  }
}