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package com.huifer.fzjh.service; | ||
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import com.huifer.fzjh.bean.RequestEntity; | ||
import com.huifer.fzjh.bean.ServerWeight; | ||
import com.huifer.fzjh.exception.LoadBalanceException; | ||
import lombok.extern.slf4j.Slf4j; | ||
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import java.util.HashMap; | ||
import java.util.List; | ||
import java.util.Map; | ||
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/** | ||
* 负载均衡算法实现: 平滑加权算轮询法 | ||
*/ | ||
@Slf4j | ||
public class SmoothnessWeightRandomLoadBalance extends AbstractLoadBalance { | ||
private int count = -1; | ||
private RequestEntity requestEntity; | ||
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private List<ServerWeight> serverWeights; | ||
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public SmoothnessWeightRandomLoadBalance(RequestEntity requestEntity, List<ServerWeight> serverWeights) { | ||
super(requestEntity, serverWeights); | ||
this.count = serverWeights.size(); | ||
this.requestEntity = requestEntity; | ||
this.serverWeights = serverWeights; | ||
} | ||
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private static String getServiceIndex(HashMap<Integer, ServerWeight> serverMap) { | ||
ServerWeight maxWeightServer = null; | ||
int allWeight = serverMap.values().stream().mapToInt(ServerWeight::getWeight).sum(); | ||
for (Map.Entry<Integer, ServerWeight> item : serverMap.entrySet()) { | ||
ServerWeight currentServer = item.getValue(); | ||
if (maxWeightServer == null || currentServer.getCurrentWeight() > maxWeightServer.getCurrentWeight()) { | ||
maxWeightServer = currentServer; | ||
} | ||
} | ||
maxWeightServer.setCurrentWeight(maxWeightServer.getCurrentWeight() - allWeight); | ||
for (Map.Entry<Integer, ServerWeight> item : serverMap.entrySet()) { | ||
ServerWeight currentServer = item.getValue(); | ||
currentServer.setCurrentWeight(currentServer.getCurrentWeight() + currentServer.getWeight()); | ||
} | ||
return maxWeightServer.getIp() + ":" + maxWeightServer.getPort(); | ||
} | ||
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@Override | ||
public String loadBalance() { | ||
if (count < 0) { | ||
throw new LoadBalanceException("机器数量不能小于0"); | ||
} | ||
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HashMap<Integer, ServerWeight> serverHashMap = new HashMap<>(); | ||
for (int i = 0; i < serverWeights.size(); i++) { | ||
serverHashMap.put(i, serverWeights.get(i)); | ||
} | ||
String hostPost = getServiceIndex(serverHashMap); | ||
log.info("当前请求信息={},负载均衡计算后的机器hostPost={}", requestEntity, hostPost); | ||
return hostPost; | ||
} | ||
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} |
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/** | ||
* Copyright 2009-2019 the original author or authors. | ||
* <p> | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* <p> | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* <p> | ||
* 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 org.apache.ibatis.submitted.ancestor_ref; | ||
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import org.apache.ibatis.BaseDataTest; | ||
import org.apache.ibatis.io.Resources; | ||
import org.apache.ibatis.session.SqlSession; | ||
import org.apache.ibatis.session.SqlSessionFactory; | ||
import org.apache.ibatis.session.SqlSessionFactoryBuilder; | ||
import org.junit.jupiter.api.BeforeAll; | ||
import org.junit.jupiter.api.Test; | ||
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import java.io.Reader; | ||
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import static org.junit.jupiter.api.Assertions.assertEquals; | ||
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class AncestorRefTest { | ||
private static SqlSessionFactory sqlSessionFactory; | ||
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@BeforeAll | ||
static void setUp() throws Exception { | ||
// create an SqlSessionFactory | ||
try (Reader reader = Resources.getResourceAsReader("org/apache/ibatis/submitted/ancestor_ref/mybatis-config.xml")) { | ||
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); | ||
} | ||
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// populate in-memory database | ||
BaseDataTest.runScript(sqlSessionFactory.getConfiguration().getEnvironment().getDataSource(), | ||
"org/apache/ibatis/submitted/ancestor_ref/CreateDB.sql"); | ||
} | ||
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@Test | ||
void testCircularAssociation() { | ||
try (SqlSession sqlSession = sqlSessionFactory.openSession()) { | ||
Mapper mapper = sqlSession.getMapper(Mapper.class); | ||
User user = mapper.getUserAssociation(1); | ||
assertEquals("User2", user.getFriend().getName()); | ||
} | ||
} | ||
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@Test | ||
void testCircularCollection() { | ||
try (SqlSession sqlSession = sqlSessionFactory.openSession()) { | ||
Mapper mapper = sqlSession.getMapper(Mapper.class); | ||
User user = mapper.getUserCollection(2); | ||
assertEquals("User2", user.getFriends().get(0).getName()); | ||
assertEquals("User3", user.getFriends().get(1).getName()); | ||
} | ||
} | ||
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@Test | ||
void testAncestorRef() { | ||
try (SqlSession sqlSession = sqlSessionFactory.openSession()) { | ||
Mapper mapper = sqlSession.getMapper(Mapper.class); | ||
Blog blog = mapper.selectBlog(1); | ||
assertEquals("Author1", blog.getAuthor().getName()); | ||
assertEquals("Author2", blog.getCoAuthor().getName()); | ||
// author and coauthor should have a ref to blog | ||
assertEquals(blog, blog.getAuthor().getBlog()); | ||
assertEquals(blog, blog.getCoAuthor().getBlog()); | ||
// reputation should point to it author? or fail but do not point to a random one | ||
assertEquals(blog.getAuthor(), blog.getAuthor().getReputation().getAuthor()); | ||
assertEquals(blog.getCoAuthor(), blog.getCoAuthor().getReputation().getAuthor()); | ||
} | ||
} | ||
} |
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/** | ||
* Copyright 2009-2019 the original author or authors. | ||
* <p> | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* <p> | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* <p> | ||
* 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 org.apache.ibatis.executor.loader; | ||
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import javassist.util.proxy.Proxy; | ||
import org.apache.ibatis.domain.blog.Author; | ||
import org.apache.ibatis.executor.ExecutorException; | ||
import org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory; | ||
import org.apache.ibatis.reflection.factory.DefaultObjectFactory; | ||
import org.apache.ibatis.session.Configuration; | ||
import org.junit.jupiter.api.Assertions; | ||
import org.junit.jupiter.api.BeforeAll; | ||
import org.junit.jupiter.api.Test; | ||
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import java.io.Serializable; | ||
import java.util.ArrayList; | ||
import java.util.HashMap; | ||
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import static org.junit.jupiter.api.Assertions.*; | ||
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class JavassistProxyTest extends SerializableProxyTest { | ||
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@BeforeAll | ||
static void createProxyFactory() { | ||
proxyFactory = new JavassistProxyFactory(); | ||
} | ||
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@Test | ||
void shouldCreateAProxyForAPartiallyLoadedBean() throws Exception { | ||
ResultLoaderMap loader = new ResultLoaderMap(); | ||
loader.addLoader("id", null, null); | ||
Object proxy = proxyFactory.createProxy(author, loader, new Configuration(), new DefaultObjectFactory(), new ArrayList<>(), new ArrayList<>()); | ||
Author author2 = (Author) deserialize(serialize((Serializable) proxy)); | ||
assertTrue(author2 instanceof Proxy); | ||
} | ||
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@Test | ||
void shouldFailCallingAnUnloadedProperty() { | ||
// yes, it must go in uppercase | ||
HashMap<String, ResultLoaderMap.LoadPair> unloadedProperties = new HashMap<>(); | ||
unloadedProperties.put("ID", null); | ||
Author author2 = (Author) ((JavassistProxyFactory) proxyFactory).createDeserializationProxy(author, unloadedProperties, new DefaultObjectFactory(), new ArrayList<>(), new ArrayList<>()); | ||
Assertions.assertThrows(ExecutorException.class, author2::getId); | ||
} | ||
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@Test | ||
void shouldLetCallALoadedProperty() { | ||
Author author2 = (Author) ((JavassistProxyFactory) proxyFactory).createDeserializationProxy(author, new HashMap<>(), new DefaultObjectFactory(), new ArrayList<>(), new ArrayList<>()); | ||
assertEquals(999, author2.getId()); | ||
} | ||
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@Test | ||
void shouldSerizalizeADeserlizaliedProxy() throws Exception { | ||
Object proxy = ((JavassistProxyFactory) proxyFactory).createDeserializationProxy(author, new HashMap<>(), new DefaultObjectFactory(), new ArrayList<>(), new ArrayList<>()); | ||
Author author2 = (Author) deserialize(serialize((Serializable) proxy)); | ||
assertEquals(author, author2); | ||
assertNotEquals(author.getClass(), author2.getClass()); | ||
} | ||
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} |
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docs/spring/cs0f13ccda-5c0d-11ee-b258-acde48001122.java
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/** | ||
* Copyright 2009-2019 the original author or authors. | ||
* <p> | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* <p> | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* <p> | ||
* 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 org.apache.ibatis.cache; | ||
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import java.util.concurrent.locks.ReadWriteLock; | ||
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/** | ||
* SPI for cache providers. | ||
* <p> | ||
* One instance of cache will be created for each namespace. | ||
* <p> | ||
* The cache implementation must have a constructor that receives the cache id as an String parameter. | ||
* <p> | ||
* MyBatis will pass the namespace as id to the constructor. | ||
* | ||
* <pre> | ||
* public MyCache(final String id) { | ||
* if (id == null) { | ||
* throw new IllegalArgumentException("Cache instances require an ID"); | ||
* } | ||
* this.id = id; | ||
* initialize(); | ||
* } | ||
* </pre> | ||
* 二级缓存 | ||
* @author Clinton Begin | ||
*/ | ||
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public interface Cache { | ||
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/** | ||
* @return The identifier of this cache | ||
*/ | ||
String getId(); | ||
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/** | ||
* 放入数据 | ||
* @param key Can be any object but usually it is a {@link CacheKey} | ||
* @param value The result of a select. | ||
*/ | ||
void putObject(Object key, Object value); | ||
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/** | ||
* 获取数据 | ||
* @param key The key | ||
* @return The object stored in the cache. | ||
*/ | ||
Object getObject(Object key); | ||
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/** | ||
* 移除数据 | ||
* As of 3.3.0 this method is only called during a rollback | ||
* for any previous value that was missing in the cache. | ||
* This lets any blocking cache to release the lock that | ||
* may have previously put on the key. | ||
* A blocking cache puts a lock when a value is null | ||
* and releases it when the value is back again. | ||
* This way other threads will wait for the value to be | ||
* available instead of hitting the database. | ||
* | ||
* | ||
* @param key The key | ||
* @return Not used | ||
*/ | ||
Object removeObject(Object key); | ||
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/** | ||
* 清空数据 | ||
* Clears this cache instance. | ||
*/ | ||
void clear(); | ||
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/** | ||
* 有多少缓存数据 | ||
* Optional. This method is not called by the core. | ||
* | ||
* @return The number of elements stored in the cache (not its capacity). | ||
*/ | ||
int getSize(); | ||
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/** | ||
* Optional. As of 3.2.6 this method is no longer called by the core. | ||
* <p> | ||
* Any locking needed by the cache must be provided internally by the cache provider. | ||
* | ||
* @return A ReadWriteLock | ||
*/ | ||
default ReadWriteLock getReadWriteLock() { | ||
return null; | ||
} | ||
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} |
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