abstractroutingdatasource targetdatasources可以配置多少个
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发布时间:2022-05-29 07:58
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时间:2023-10-11 23:44
Java代码:
/**
* Retrieve the current target DataSource. Determines the
* {@link #determineCurrentLookupKey() current lookup key}, performs
* a lookup in the {@link #setTargetDataSources targetDataSources} map,
* falls back to the specified
* {@link #setDefaultTargetDataSource default target DataSource} if necessary.
* @see #determineCurrentLookupKey()
*/
protected DataSource determineTargetDataSource() {
Assert.notNull(this.resolvedDataSources, "DataSource router not initialized");
Object lookupKey = determineCurrentLookupKey();
DataSource dataSource = (DataSource) this.resolvedDataSources.get(lookupKey);
if (dataSource == null) {
dataSource = this.resolvedDefaultDataSource;
}
if (dataSource == null) {
throw new IllegalStateException("Cannot determine target DataSource for lookup key [" + lookupKey + "]");
}
return dataSource;
}
这里用到了我们需要进行实现的抽象方法determineCurrentLookupKey(),该方法返回需要使用的DataSource的key值,然后根据这个key从resolvedDataSources这个map里取出对应的DataSource,如果找不到,则用默认的resolvedDefaultDataSource