StoragePluginRulesFactory 是dremio 为了分离每个插件的规则，我们存储插件可以包含自己的规则工厂，具体使用到StoragePluginRulesFactory
的包含了CatalogServiceImpl，SqlHandlerConfig，实际都会到sql 执行的handler 中
系统内置实现
集成使用
主要是CatalogServiceImpl.java 中，其他执行部分通过间接引用
public RuleSet getStorageRules(OptimizerRulesContext context, PlannerPhase phase) {
final ImmutableSet.Builder<RelOptRule> rules = ImmutableSet.builder();
final Set<SourceType> types = new HashSet<>();
try {
for (ManagedStoragePlugin plugin : getPlugins().managed()) {
// we want to check state without acquiring a read lock
if (plugin.getState().getStatus() == SourceState.SourceStatus.bad) {
// we shouldn't consider rules for misbehaving plugins.
continue;
}
StoragePluginId pluginId;
try {
// getId has a check for plugin state
pluginId = plugin.getId();
} catch (UserException e) {
if (e.getErrorType() == ErrorType.SOURCE_BAD_STATE) {
// we shouldn't consider rules for misbehaving plugins.
continue;
}
throw e;
}
StoragePluginRulesFactory factory = plugin.getRulesFactory();
if(factory != null) {
// add instance level rules.
rules.addAll(factory.getRules(context, phase, pluginId));
// add type level rules.
if(types.add(pluginId.getType())) {
rules.addAll(factory.getRules(context, phase, pluginId.getType()));
}
}
}
} catch (InstantiationException | IllegalAccessException e) {
throw UserException.validationError(e).message("Failure getting plugin rules.").build(logger);
}
ImmutableSet<RelOptRule> rulesSet = rules.build();
return RuleSets.ofList(rulesSet);
}
SqlHandlerConfig 对于规则的使用 SqlHandlerConfig.java 间接也是通过执行上下文使用的CatalogService
public RuleSet getRules(PlannerPhase phase) {
return PlannerPhase.mergedRuleSets(
context.getInjectedRules(phase),
phase.getRules(context),
context.getCatalogService().getStorageRules(context, phase));
}
说明
dremio StoragePluginRulesFactory 还是比较强大的，扩展了dremio sql 处理能力，是一个很不错的扩展点 尤其我们需要开发自己的存储扩展的时候
参考资料
https://github.com/dremio/dremio-oss/blob/d41cb52143b6b0289fc8ed4d970bfcf410a669e8/sabot/kernel/src/main/java/com/dremio/exec/catalog/CatalogServiceImpl.java
https://github.com/dremio/dremio-oss/blob/d41cb52143b6b0289fc8ed4d970bfcf410a669e8/sabot/kernel/src/main/java/com/dremio/exec/planner/sql/handlers/SqlHandlerConfig.java
https://github.com/dremio/dremio-oss/blob/d41cb52143b6b0289fc8ed4d970bfcf410a669e8/sabot/kernel/src/main/java/com/dremio/exec/store/StoragePlugin.java
原文地址：http://www.cnblogs.com/rongfengliang/p/16813109.html
