import entity.Dog;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

public class CacheTest {
	public static void main(String[] args) {
		// 1. 创建缓存管理器
		CacheManager cacheManager = CacheManager.create("./src/main/resources/ehcache.xml");
		
		// 2. 获取缓存对象
		Cache cache = cacheManager.getCache("HelloWorldCache");
		
		// 3. 创建元素
		Element element = new Element("key1", "value1");
		
		// 4. 将元素添加到缓存
		cache.put(element);
		
		// 5. 获取缓存
		Element value = cache.get("key1");
		System.out.println("value: " + value);
		System.out.println(value.getObjectValue());
		
		// 6. 删除元素
		cache.remove("key1");
		
		Dog dog = new Dog("xiaohei", "black", 2);
		Element element2 = new Element("dog", dog);
		cache.put(element2);
		Element value2 = cache.get("dog");
		System.out.println("value2: "  + value2);
		Dog dog2 = (Dog) value2.getObjectValue();
		System.out.println(dog2);
		
		System.out.println(cache.getSize());
		
		// 7. 刷新缓存
		cache.flush();
		
		// 8. 关闭缓存管理器
		cacheManager.shutdown();

	}
}

public class Dog {
	private String name;
	private String color;
	private int age;
	
	public Dog() {
	}
	
	public Dog(String name, String color, int age) {
		super();
		this.name = name;
		this.color = color;
		this.age = age;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public String toString() {
		return "Dog [name=" + name + ", color=" + color + ", age=" + age + "]";
	}
}

Cache cache = manager.getCache("mycache"); 
CacheConfiguration config = cache.getCacheConfiguration(); 
config.setTimeToIdleSeconds(60); 
config.setTimeToLiveSeconds(120); 
config.setmaxEntriesLocalHeap(10000); 
config.setmaxEntriesLocalDisk(1000000);

// 可以自己创建一个Cache对象添加到CacheManager中
public void addCache(Cache cache);
public synchronized void removeCache(String cacheName);

public static CacheManager create();
public static CacheManager create(String configurationFileName);
public static CacheManager create(InputStream inputStream);
public static CacheManager create(URL configurationFileURL);

public static CacheManager newInstance();

// CacheManager.create() == CacheManager.create("./src/main/resources/ehcache.xml")
// 使用Ehcache默认配置新建一个CacheManager实例
CacheManager cacheManager = CacheManager.create();
cacheManager = CacheManager.newInstance();

cacheManager = CacheManager.newInstance("./src/main/resources/ehcache.xml");

InputStream inputStream = new FileInputStream(new File("./src/main/resources/ehcache.xml"));
cacheManager = CacheManager.newInstance(inputStream);

String[] cacheNames = cacheManager.getCacheNames();  // [HelloWorldCache]

public interface EhcacheService {

    // 测试失效情况，有效期为5秒
    public String getTimestamp(String param);

    public String getDataFromDB(String key);

    public void removeDataAtDB(String key);

    public String refreshData(String key);


    public User findById(String userId);

    public boolean isReserved(String userId);

    public void removeUser(String userId);

    public void removeAllUser();
}

import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
public class EhcacheServiceImpl implements EhcacheService{

    // value的值和ehcache.xml中的配置保持一致
    @Cacheable(value="HelloWorldCache", key="#param")
    public String getTimestamp(String param) {
        Long timestamp = System.currentTimeMillis();
        return timestamp.toString();
    }

    @Cacheable(value="HelloWorldCache", key="#key")
    public String getDataFromDB(String key) {
        System.out.println("从数据库中获取数据...");
        return key + ":" + String.valueOf(Math.round(Math.random()*1000000));
    }

    @CacheEvict(value="HelloWorldCache", key="#key")
    public void removeDataAtDB(String key) {
        System.out.println("从数据库中删除数据");
    }

    @CachePut(value="HelloWorldCache", key="#key")
    public String refreshData(String key) {
        System.out.println("模拟从数据库中加载数据");
        return key + "::" + String.valueOf(Math.round(Math.random()*1000000));
    }

    // ------------------------------------------------------------------------
    @Cacheable(value="UserCache", key="'user:' + #userId")    
    public User findById(String userId) {  
        System.out.println("模拟从数据库中查询数据");
        return new User(1, "mengdee");           
    }  

    @Cacheable(value="UserCache", condition="#userId.length()<12")    
    public boolean isReserved(String userId) {    
        System.out.println("UserCache:"+userId);    
        return false;    
    }

    //清除掉UserCache中某个指定key的缓存    
    @CacheEvict(value="UserCache",key="'user:' + #userId")    
    public void removeUser(String userId) {    
        System.out.println("UserCache remove:"+ userId);    
    }    

    //allEntries：true表示清除value中的全部缓存，默认为false
    //清除掉UserCache中全部的缓存    
    @CacheEvict(value="UserCache", allEntries=true)    
    public void removeAllUser() {    
       System.out.println("UserCache delete all");    
    }
}

public class User {
    private int id;
    private String name;
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    public User() {
    }
    
    public User(int id, String name) {
        super();
        this.id = id;
        this.name = name;
    }
    
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + "]";
    }
}

// 将缓存保存到名称为UserCache中，键为"user:"字符串加上userId值，如 'user:1'
@Cacheable(value="UserCache", key="'user:' + #userId") 
public User findById(String userId) { 
    return (User) new User("1", "mengdee"); 
}

// 将缓存保存进UserCache中，并当参数userId的长度小于12时才保存进缓存，默认使用参数值及类型作为缓存的key
// 保存缓存需要指定key，value， value的数据类型，不指定key默认和参数名一样如："1"
@Cacheable(value="UserCache", condition="#userId.length() < 12") 
public boolean isReserved(String userId) { 
    System.out.println("UserCache:"+userId); 
    return false; 
}　　

//清除掉UserCache中某个指定key的缓存    
@CacheEvict(value="UserCache",key="'user:' + #userId")    
public void removeUser(User user) {    
    System.out.println("UserCache"+user.getUserId());    
}    

//清除掉UserCache中全部的缓存    
@CacheEvict(value="UserCache", allEntries=true)    
public final void setReservedUsers(String[] reservedUsers) {    
   System.out.println("UserCache deleteall");    
}

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@ContextConfiguration(locations = {"classpath:spring-base.xml","classpath:spring-ehcache.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class SpringTestCase extends AbstractJUnit4SpringContextTests{

}

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import com.gdut.ehcache.EhcacheService;



public class EhcacheServiceTest extends SpringTestCase{

    @Autowired //@Autowired 是通过 byType 的方式去注入的， 使用该注解，要求接口只能有一个实现类。
    private EhcacheService ehcacheService;

    // 有效时间是5秒，第一次和第二次获取的值是一样的，因第三次是5秒之后所以会获取新的值
    @Test
    public void testTimestamp() throws InterruptedException{
        System.out.println("第一次调用：" + ehcacheService.getTimestamp("param"));
        Thread.sleep(2000);
        System.out.println("2秒之后调用：" + ehcacheService.getTimestamp("param"));
        Thread.sleep(4000);
        System.out.println("再过4秒之后调用：" + ehcacheService.getTimestamp("param"));
    }

    @Test
    public void testCache(){
        String key = "zhangsan";
        String value = ehcacheService.getDataFromDB(key); // 从数据库中获取数据...
        ehcacheService.getDataFromDB(key);  // 从缓存中获取数据，所以不执行该方法体
        ehcacheService.removeDataAtDB(key); // 从数据库中删除数据
        ehcacheService.getDataFromDB(key);  // 从数据库中获取数据...（缓存数据删除了，所以要重新获取，执行方法体）
    }

    @Test
    public void testPut(){
        String key = "mengdee";
        ehcacheService.refreshData(key);  // 模拟从数据库中加载数据
        String data = ehcacheService.getDataFromDB(key);
        System.out.println("data:" + data); // data:mengdee::103385

        ehcacheService.refreshData(key);  // 模拟从数据库中加载数据
        String data2 = ehcacheService.getDataFromDB(key);
        System.out.println("data2:" + data2);   // data2:mengdee::180538    
    }


    @Test
    public void testFindById(){
        ehcacheService.findById("2"); // 模拟从数据库中查询数据
        ehcacheService.findById("2");
    }

    @Test
    public void testIsReserved(){
        ehcacheService.isReserved("123");
        ehcacheService.isReserved("123");
    }

    @Test
    public void testRemoveUser(){
        // 线添加到缓存
        ehcacheService.findById("1");

        // 再删除
        ehcacheService.removeUser("1");

        // 如果不存在会执行方法体
        ehcacheService.findById("1");
    }

    @Test
    public void testRemoveAllUser(){
        ehcacheService.findById("1");
        ehcacheService.findById("2");

        ehcacheService.removeAllUser();

        ehcacheService.findById("1");
        ehcacheService.findById("2");

//      模拟从数据库中查询数据
//      模拟从数据库中查询数据
//      UserCache delete all
//      模拟从数据库中查询数据
//      模拟从数据库中查询数据
    }

}