import com.espertech.esper.client.annotation.HookType; //导入依赖的package包/类
public static QueryPlanIndexHook getHook(Annotation[] annotations, EngineImportService engineImportService) {
    try {
        return (QueryPlanIndexHook) EngineImportUtil.getAnnotationHook(annotations, HookType.INTERNAL_QUERY_PLAN, QueryPlanIndexHook.class, engineImportService);
    } catch (ExprValidationException e) {
        throw new EPException("Failed to obtain hook for " + HookType.INTERNAL_QUERY_PLAN);
    }
}
 

import com.espertech.esper.client.annotation.HookType; //导入依赖的package包/类
private static GroupByRollupInfo analyzeValidateGroupBy(GroupByClauseExpressions groupBy, ExprValidationContext validationContext)
        throws ExprValidationException {
    if (groupBy == null) {
        return null;
    }

    // validate that group-by expressions are somewhat-plain expressions
    ExprNodeUtilityRich.validateNoSpecialsGroupByExpressions(groupBy.getGroupByNodes());

    // validate each expression
    ExprNode[] validated = new ExprNode[groupBy.getGroupByNodes().length];
    for (int i = 0; i < validated.length; i++) {
        validated[i] = ExprNodeUtilityRich.getValidatedSubtree(ExprNodeOrigin.GROUPBY, groupBy.getGroupByNodes()[i], validationContext);
    }

    if (groupBy.getGroupByRollupLevels() == null) {
        return new GroupByRollupInfo(validated, null);
    }

    AggregationGroupByRollupDesc rollup = AggregationGroupByRollupDesc.make(groupBy.getGroupByRollupLevels());

    // callback when hook reporting enabled
    try {
        GroupByRollupPlanHook hook = (GroupByRollupPlanHook) EngineImportUtil.getAnnotationHook(validationContext.getAnnotations(), HookType.INTERNAL_GROUPROLLUP_PLAN, GroupByRollupPlanHook.class, validationContext.getEngineImportService());
        if (hook != null) {
            hook.query(new GroupByRollupPlanDesc(validated, rollup));
        }
    } catch (ExprValidationException e) {
        throw new EPException("Failed to obtain hook for " + HookType.INTERNAL_QUERY_PLAN);
    }

    return new GroupByRollupInfo(validated, rollup);
}
 

import com.espertech.esper.client.annotation.HookType; //导入依赖的package包/类
public static QueryPlanIndexHook getHook(Annotation[] annotations) {
    try {
        return (QueryPlanIndexHook) JavaClassHelper.getAnnotationHook(annotations, HookType.INTERNAL_QUERY_PLAN, QueryPlanIndexHook.class, null);
    }
    catch (ExprValidationException e) {
        throw new EPException("Failed to obtain hook for " + HookType.INTERNAL_QUERY_PLAN);
    }
}