HikariCP是数据库连接池,而且是号称史上最快的,而且目前来看确实是这样的,SpringBoot2.0也已经采用HikariCP作为默认连接池配置.
HikariCP 默认配置
主要参数是在 com.zaxxer.hikari.HikariConfig 中初始化的,部分参数是在 com.zaxxer.hikari.pool.PoolBase 中初始化的。
name | 描述 | 构造器默认值 | 默认配置validate之后的值 | validate重置 |
---|---|---|---|---|
autoCommit | 自动提交从池中返回的连接 | true | true | - |
connectionTimeout | 等待来自池的连接的最大毫秒数 | SECONDS.toMillis(30) = 30000 | 30000 | 如果小于250毫秒,则被重置回30秒 |
idleTimeout | 连接允许在池中闲置的最长时间 | MINUTES.toMillis(10) = 600000 | 600000 | 如果idleTimeout+1秒>maxLifetime 且 maxLifetime>0,则会被重置为0(代表永远不会退出);如果idleTimeout!=0且小于10秒,则会被重置为10秒 |
maxLifetime | 池中连接最长生命周期 | MINUTES.toMillis(30) = 1800000 | 1800000 | 如果不等于0且小于30秒则会被重置回30分钟 |
connectionTestQuery | 如果您的驱动程序支持JDBC4,我们强烈建议您不要设置此属性 | null | null | - |
minimumIdle | 池中维护的最小空闲连接数 | -1 | 10 | minIdle<0或者minIdle>maxPoolSize,则被重置为maxPoolSize |
maximumPoolSize | 池中最大连接数,包括闲置和使用中的连接 | -1 | 10 | 如果maxPoolSize小于1,则会被重置。当minIdle<=0被重置为DEFAULT_POOL_SIZE则为10;如果minIdle>0则重置为minIdle的值 |
metricRegistry | 该属性允许您指定一个 Codahale / Dropwizard MetricRegistry 的实例,供池使用以记录各种指标 |
null | null | - |
healthCheckRegistry | 该属性允许您指定池使用的Codahale / Dropwizard HealthCheckRegistry的实例来报告当前健康信息 | null | null | - |
poolName | 连接池的用户定义名称,主要出现在日志记录和JMX管理控制台中以识别池和池配置 | null | HikariPool-1 | - |
initializationFailTimeout | 如果池无法成功初始化连接,则此属性控制池是否将 fail fast |
1 | 1 | - |
isolateInternalQueries | 是否在其自己的事务中隔离内部池查询,例如连接活动测试 | false | false | - |
allowPoolSuspension | 控制池是否可以通过JMX暂停和恢复 | false | false | - |
readOnly | 从池中获取的连接是否默认处于只读模式 | false | false | - |
registerMbeans | 是否注册JMX管理Bean(MBeans ) |
false | false | - |
catalog | 为支持 catalog 概念的数据库设置默认 catalog |
driver default | null | - |
connectionInitSql | 该属性设置一个SQL语句,在将每个新连接创建后,将其添加到池中之前执行该语句。 | null | null | - |
driverClassName | HikariCP将尝试通过仅基于jdbcUrl的DriverManager解析驱动程序,但对于一些较旧的驱动程序,还必须指定driverClassName | null | null | - |
transactionIsolation | 控制从池返回的连接的默认事务隔离级别 | null | null | - |
validationTimeout | 连接将被测试活动的最大时间量 | SECONDS.toMillis(5) = 5000 | 5000 | 如果小于250毫秒,则会被重置回5秒 |
leakDetectionThreshold | 记录消息之前连接可能离开池的时间量,表示可能的连接泄漏 | 0 | 0 | 如果大于0且不是单元测试,则进一步判断:(leakDetectionThreshold < SECONDS.toMillis(2) or (leakDetectionThreshold > maxLifetime && maxLifetime > 0),会被重置为0 . 即如果要生效则必须>0,而且不能小于2秒,而且当maxLifetime > 0时不能大于maxLifetime |
dataSource | 这个属性允许你直接设置数据源的实例被池包装,而不是让HikariCP通过反射来构造它 | null | null | - |
schema | 该属性为支持模式概念的数据库设置默认模式 | driver default | null | - |
threadFactory | 此属性允许您设置将用于创建池使用的所有线程的java.util.concurrent.ThreadFactory的实例。 | null | null | - |
scheduledExecutor | 此属性允许您设置将用于各种内部计划任务的java.util.concurrent.ScheduledExecutorService实例 | null | null | - |
0.maven
com.zaxxer
HikariCP
3.2.0
1.mysqlContext.xml
2.mybatis-config.xml
3.DynamicDataSourceInterceptor
import java.util.Locale;
import java.util.Properties;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.keygen.SelectKeyGenerator;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.springframework.transaction.support.TransactionSynchronizationManager;
@Intercepts({ @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
RowBounds.class, ResultHandler.class }) })
public class DynamicDataSourceInterceptor implements Interceptor {
private static final String REGEX = ".*insert\\u0020.*|.*delete\\u0020.*|.*update\\u0020.*|.*xxl_job.*|.*XXL_JOB.*";
@Override
public Object intercept(Invocation invocation) throws Throwable {
boolean syschronizationActive = TransactionSynchronizationManager.isActualTransactionActive();
Object[] objects = invocation.getArgs();
MappedStatement mappedStatement = (MappedStatement) objects[0];
String lookupKey = DynamicDataSourceHolder.DB_MASTER;
if (syschronizationActive != true) {
if (mappedStatement.getSqlCommandType().equals(SqlCommandType.SELECT)) {
if (mappedStatement.getId().contains(SelectKeyGenerator.SELECT_KEY_SUFFIX)) {
lookupKey = DynamicDataSourceHolder.DB_MASTER;
} else {
BoundSql boundSql = mappedStatement.getSqlSource().getBoundSql(objects[1]);
String sql = boundSql.getSql().toLowerCase(Locale.CHINA).replaceAll("[\\t\\n\\r]", " ");
if (sql.matches(REGEX)) {
lookupKey = DynamicDataSourceHolder.DB_MASTER;
} else {
lookupKey = DynamicDataSourceHolder.DB_SLAVE;
}
}
}
} else {
lookupKey = DynamicDataSourceHolder.DB_MASTER;
}
DynamicDataSourceHolder.setDbType(lookupKey);
return invocation.proceed();
}
@Override
public Object plugin(Object target) {
if (target instanceof Executor)
return Plugin.wrap(target, this);
else
return target;
}
@Override
public void setProperties(Properties properties) {
}
}
4.PersistenceInterceptor
import java.util.Collection;
import java.util.Date;
import java.util.Properties;
import org.apache.ibatis.binding.MapperMethod.ParamMap;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
@Intercepts({@Signature(
type = Executor.class,
method = "update",
args = {MappedStatement.class, Object.class}
)})
public class PersistenceInterceptor implements Interceptor {
public PersistenceInterceptor() {
}
public Object intercept(Invocation invocation) throws Throwable {
Object[] args = invocation.getArgs();
MappedStatement mappedStatement = (MappedStatement)args[0];
Object object = args[1];
NulEntity entity;
if (mappedStatement.getSqlCommandType().equals(SqlCommandType.INSERT) && ThreadLocalHolder.get() != null) {
if (object instanceof NulEntity) {
entity = (NulEntity)object;
entity.setCreator(ThreadLocalHolder.get().toString());
entity.setCreatedAt(new Date());
}
if (object instanceof ParamMap) {
ParamMap paramMap = (ParamMap)object;
Object obj = paramMap.get("param1");
if (obj instanceof Collection) {
Collection list = (Collection)obj;
Object[] objects = list.toArray();
if (objects[0] instanceof NulEntity) {
for(int i = 0; i < objects.length; ++i) {
NulEntity entity = (NulEntity)objects[i];
entity.setCreator(ThreadLocalHolder.get().toString());
entity.setCreatedAt(new Date());
}
}
}
}
} else if (mappedStatement.getSqlCommandType().equals(SqlCommandType.UPDATE) && ThreadLocalHolder.get() != null && object instanceof NulEntity) {
entity = (NulEntity)object;
entity.setModifier(ThreadLocalHolder.get().toString());
entity.setUpdatedAt(new Date());
String key = CacheHelper.buildKey(entity.getClass().getName() + ":" + entity.getId());
CacheHelper.evict(CacheType.FIVE_MINUTE_STORE.getValue(), key);
}
return invocation.proceed();
}
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
public void setProperties(Properties properties) {
}
}
5.DynamicDataSourceHolder
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DynamicDataSourceHolder {
private static final Logger LOG = LoggerFactory.getLogger(DynamicDataSourceHolder.class);
private static ThreadLocal contextHolder = new ThreadLocal();
public static final String DB_MASTER = "master";
public static final String DB_SLAVE = "slave";
public static String getDbType() {
String db = contextHolder.get();
if (db == null)
db = DB_MASTER;
if (LOG.isInfoEnabled())
LOG.info("当前所使用的数据源为:" + db);
return db;
}
public static void setDbType(String datasource) {
contextHolder.set(datasource);
}
public static void clearDbType() {
contextHolder.remove();
}
public static boolean isMaster() {
return DB_MASTER.equals(getDbType());
}
}
6.DynamicDataSource
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DynamicDataSourceHolder.getDbType();
}
}