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DynamicDataSource.java
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DynamicDataSource.java
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package com.laiyw.micro.mybatis.dynamic;
import com.laiyw.micro.mybatis.enums.DynamicDataSourceType;
import com.laiyw.micro.mybatis.provide.DataSourceProvide;
import com.laiyw.micro.mybatis.strategy.SlaveChangeStrategyFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.Map;
/**
* @ProjectName micro
* @Author Laiyw
* @CreateTime 2022/5/9 9:56
* @Description TODO
*/
@Slf4j
@RefreshScope
@Component
public class DynamicDataSource extends AbstractRoutingDataSource {
private static Map<Object, Object> targetDataSources = new HashMap<>();
private static int slaveNumber = 0;
@Value("${spring.datasource.druid.slave-change-strategy:loop}")
private String slaveChangeStrategy;
@Autowired
public void setProvide(DataSourceProvide provide) {
targetDataSources = provide.initialize();
slaveNumber = targetDataSources.size() - 1;
}
@Override
protected Object determineCurrentLookupKey() {
DynamicDataSourceType datasourceType = DynamicDatasourceHolder.getDatasourceType();
if (null == datasourceType || DynamicDataSourceType.master.equals(datasourceType)) {
return DynamicDataSourceType.master;
}
if (slaveNumber == 0) {
log.debug("无有效Slave数据源,改用Master数据源");
return DynamicDataSourceType.master;
}
int slaveNum = 1;
if (slaveNumber > 1) {
log.debug("Slave节点选举策略: {}", slaveChangeStrategy);
slaveNum = SlaveChangeStrategyFactory.getSlaveChangeStrategy(slaveChangeStrategy).selectSlaveNode(slaveNumber);
}
return targetDataSources.get(String.format("%s_%d", DynamicDataSourceType.slave.name(), slaveNum));
}
@Override
public void afterPropertiesSet() {
setDefaultTargetDataSource(targetDataSources.get(DynamicDataSourceType.master.name()));
setTargetDataSources(targetDataSources);
super.afterPropertiesSet();
}
}