package com.mayi.ehcache.demo;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.search.Attribute;
import net.sf.ehcache.search.Query;
import net.sf.ehcache.search.Result;
import net.sf.ehcache.search.Results;
import org.junit.Assert;
import org.junit.Test;
import java.io.InputStream;
import java.util.List;
import java.util.Set;
public class EhcacheTest {
@Test
public void testCacheManager() {
//加载EhCache配置文件
InputStream in = EhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml");
CacheManager cm = CacheManager.create(in);
//列出所有的缓存名称,不包括配置文件中的<defaultCache>
String[] names = cm.getCacheNames();
//只有一个名称为data-cache的cache
Assert.assertEquals(1, names.length);
Assert.assertEquals(names[0], "data-cache");
//根据指定名称查找缓存对象
Cache cache = cm.getCache("data-cache"); //根据缓存名称获取缓存
Assert.assertNotNull(cache);
//获取,更新Cache配置的接口
// CacheConfiguration configuration = cache.getCacheConfiguration();
// configuration.setTimeToIdleSeconds(3600);
//缓存在内存中的配置信息,缓存配置动态修改也会体现出来,
System.out.println(cm.getActiveConfigurationText());
//清除所有缓存的数据,但是缓存本身仍然存在
// cm.clearAll();
//从内存中删除一个缓存以及所有的数据,Cache被销毁
// cm.removeCache("data-cache");
}
@Test
public void testCache() {
//只有被有初始化生效的Cache允许改名字
//cache.setName("data-cache-changed");
}
@Test
public void testAddElementToCache() {
//加载EhCache配置文件
InputStream in = EhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml");
CacheManager cm = CacheManager.create(in);
Cache cache = cm.getCache("data-cache");
Person p1 = new Person(1, "Jack", 21);
Person p2 = new Person(2, "Mike", 73);
cache.putIfAbsent(new Element(p1,p1, 1));
cache.put(new Element(p2,p2, 1));
cache.putIfAbsent(new Element(p2, p1,1));//只有Key为p2的数据不存在才插入
//得到的是p2,而不是p1
Element e = cache.get(p2);
Assert.assertEquals(p2, e.getObjectValue());
//把数据从内存刷到DiskStore,从DiskStore刷新到Disk中
cache.flush();
}
@Test
public void testRemoveElementFromCache() {
//加载EhCache配置文件
InputStream in = EhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml");
CacheManager cm = CacheManager.create(in);
Cache cache = cm.getCache("data-cache");
Person p1 = new Person(1, "Jack", 21);
Person p2 = new Person(2, "Mike", 73);
Element e1 = new Element(p1,p1, 1);
cache.putIfAbsent(e1);
Element e2 = new Element(p2,p2, 1);
cache.put(e2);
cache.remove(p1);
boolean isSucc = cache.removeElement(e1);
//e1已经被删除,因此操作返回false
Assert.assertFalse(isSucc);
cache.put(e1);
cache.removeAll();
Assert.assertEquals(0, cache.getSize());
}
@Test
public void testUpdateElementInCache() {
//加载EhCache配置文件
InputStream in = EhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml");
CacheManager cm = CacheManager.create(in);
Cache cache = cm.getCache("data-cache");
Person p1 = new Person(1, "Jack", 21);
Person p2 = new Person(2, "Mike", 73);
Element e1 = new Element(p1,p1, 1);
cache.putIfAbsent(e1);
Element e2 = new Element(p2,p2, 1);
cache.put(e2);
e2 = new Element(p2, p1, 1);
cache.replace(e2);
Assert.assertEquals(p1, e2.getObjectValue());
}
@Test
public void testQueryElementsFromCache() {
InputStream in = EhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml");
CacheManager cm = CacheManager.create(in);
Cache cache = cm.getCache("data-cache");
//EhCache中的数据类型是Element,它包含Key,Value和一个版本信息
Element e = new Element(1000, 10000, 1);
cache.put(e);
//添加第二个数据
e = new Element(2000, 20000, 1);
cache.put(e);
//缓存中有两条数据
Assert.assertEquals(2, cache.getSize());
//通过get方法获得key对应的数据
e = cache.get(1000);
Assert.assertEquals(10000, e.getObjectValue());
//创建查询
Query q = cache.createQuery();
//Cache没有配置任何查询属性,这里察看下默认的查询属性有哪些
//set中包含两个可查询元素:key和value
Set<Attribute> set = cache.getSearchAttributes();
//属性是范型类,得到key都应的查询属性对象
Attribute<Integer> keyAttribute = cache.getSearchAttribute("key"); //根据默认提供的可查询属性key进行查询
//构造查询条件,这是一个链式写法,一个Query对象可以写多个查询条件
//创建查找key的值为2000的查询
q = q.addCriteria(keyAttribute.eq(2000));
//如果不includeKeys和q.includeValues();,则测试结果集中不包括Keys和Values信息
q.includeKeys();
q.includeValues();
//执行查询
Results results = q.execute();//执行查询
Assert.assertNotNull(results);
Assert.assertEquals(results.size(), 1);
//列出所有结果
List<Result> resultList = results.all();
Result result = resultList.get(0);
Assert.assertEquals(2000, result.getKey());
Assert.assertEquals(20000, result.getValue());
}
}
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