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import {IPlan} from '../interfaces/iplan';
import {EstimateDirection} from '../enums';
/// <reference path="moment.d.ts" />
/// <reference path="lodash.d.ts" />
export class PlanService {
// plan property keys
NODE_TYPE_PROP: string = 'Node Type';
ACTUAL_ROWS_PROP: string = 'Actual Rows';
PLAN_ROWS_PROP: string = 'Plan Rows';
ACTUAL_TOTAL_TIME_PROP: string = 'Actual Total Time';
ACTUAL_LOOPS_PROP: string = 'Actual Loops';
TOTAL_COST_PROP: string = 'Total Cost';
PLANS_PROP: string = 'Plans';
RELATION_NAME_PROP: string = 'Relation Name';
SCHEMA_PROP: string = 'Schema';
ALIAS_PROP: string = 'Alias';
GROUP_KEY_PROP: string = 'Group Key';
SORT_KEY_PROP: string = 'Sort Key';
JOIN_TYPE_PROP: string = 'Join Type';
INDEX_NAME_PROP: string = 'Index Name';
HASH_CONDITION_PROP: string = 'Hash Cond';
// computed by pev
COMPUTED_TAGS_PROP: string = '*Tags';
COSTLIEST_NODE_PROP: string = '*Costiest Node (by cost)';
LARGEST_NODE_PROP: string = '*Largest Node (by rows)';
SLOWEST_NODE_PROP: string = '*Slowest Node (by duration)';
MAXIMUM_COSTS_PROP: string = '*Most Expensive Node (cost)';
MAXIMUM_ROWS_PROP: string = '*Largest Node (rows)';
MAXIMUM_DURATION_PROP: string = '*Slowest Node (time)';
ACTUAL_DURATION_PROP: string = '*Actual Duration';
ACTUAL_COST_PROP: string = '*Actual Cost';
PLANNER_ESTIMATE_FACTOR: string = '*Planner Row Estimate Factor';
PLANNER_ESIMATE_DIRECTION: string = '*Planner Row Estimate Direction';
ARRAY_INDEX_KEY: string = 'arrayIndex';
PEV_PLAN_TAG: string = 'plan_';
private _maxRows: number = 0;
private _maxCost: number = 0;
private _maxDuration: number = 0;
getPlans(): Array<IPlan> {
var plans: Array<IPlan> = [];
for (var i in localStorage) {
if (_.startsWith(i, this.PEV_PLAN_TAG)) {
plans.push(JSON.parse(localStorage[i]));
}
}
return plans;
}
getPlan(id: string): IPlan {
return JSON.parse(localStorage.getItem(id));
}
createPlan(planName: string, planContent: string, planQuery): IPlan {
var plan: IPlan = {
id: this.PEV_PLAN_TAG + new Date().getTime().toString(),
name: planName || 'plan created on ' + moment().format('LLL'),
createdOn: new Date(),
content: JSON.parse(planContent)[0],
query: planQuery
};
this.analyzePlan(plan);
return plan;
}
isJsonString(str) {
try {
JSON.parse(str);
} catch (e) {
return false;
}
return true;
}
analyzePlan(plan: IPlan) {
this.processNode(plan.content.Plan);
plan.content[this.MAXIMUM_ROWS_PROP] = this._maxRows;
plan.content[this.MAXIMUM_COSTS_PROP] = this._maxCost;
plan.content[this.MAXIMUM_DURATION_PROP] = this._maxDuration;
this.findOutlierNodes(plan.content.Plan);
localStorage.setItem(plan.id, JSON.stringify(plan));
}
deletePlan(plan: IPlan) {
localStorage.removeItem(plan.id);
}
deleteAllPlans() {
localStorage.clear();
}
// recursively walk down the plan to compute various metrics
processNode(node) {
this.calculatePlannerEstimate(node);
this.calculateActuals(node);
_.each(node, (value, key) => {
this.calculateMaximums(node, key, value);
if (key === this.PLANS_PROP) {
_.each(value, (value) => {
this.processNode(value);
});
}
});
}
calculateMaximums(node, key, value) {
if (key === this.ACTUAL_ROWS_PROP && this._maxRows < value) {
this._maxRows = value;
}
if (key === this.ACTUAL_COST_PROP && this._maxCost < value) {
this._maxCost = value;
}
if (key === this.ACTUAL_DURATION_PROP && this._maxDuration < value) {
this._maxDuration = value;
}
}
findOutlierNodes(node) {
node[this.SLOWEST_NODE_PROP] = false;
node[this.LARGEST_NODE_PROP] = false;
node[this.COSTLIEST_NODE_PROP] = false;
if (node[this.ACTUAL_COST_PROP] === this._maxCost) {
node[this.COSTLIEST_NODE_PROP] = true;
}
if (node[this.ACTUAL_ROWS_PROP] === this._maxRows) {
node[this.LARGEST_NODE_PROP] = true;
}
if (node[this.ACTUAL_DURATION_PROP] === this._maxDuration) {
node[this.SLOWEST_NODE_PROP] = true;
}
_.each(node, (value, key) => {
if (key === this.PLANS_PROP) {
_.each(value, (value) => {
this.findOutlierNodes(value);
});
}
});
}
// actual duration and actual cost are calculated by subtracting child values from the total
calculateActuals(node) {
node[this.ACTUAL_DURATION_PROP] = node[this.ACTUAL_TOTAL_TIME_PROP];
node[this.ACTUAL_COST_PROP] = node[this.TOTAL_COST_PROP];
_.each(node.Plans, subPlan => {
node[this.ACTUAL_DURATION_PROP] = node[this.ACTUAL_DURATION_PROP] - subPlan[this.ACTUAL_TOTAL_TIME_PROP];
node[this.ACTUAL_COST_PROP] = node[this.ACTUAL_COST_PROP] - subPlan[this.TOTAL_COST_PROP];
});
if (node[this.ACTUAL_COST_PROP] < 0) {
node[this.ACTUAL_COST_PROP] = 0;
}
// since time is reported for an invidual loop, actual duration must be adjusted by number of loops
node[this.ACTUAL_DURATION_PROP] = node[this.ACTUAL_DURATION_PROP] * node[this.ACTUAL_LOOPS_PROP];
}
// figure out order of magnitude by which the planner mis-estimated how many rows would be
// invloved in this node
calculatePlannerEstimate(node) {
node[this.PLANNER_ESTIMATE_FACTOR] = node[this.ACTUAL_ROWS_PROP] / node[this.PLAN_ROWS_PROP];
node[this.PLANNER_ESIMATE_DIRECTION] = EstimateDirection.under;
if (node[this.PLANNER_ESTIMATE_FACTOR] < 1) {
node[this.PLANNER_ESIMATE_DIRECTION] = EstimateDirection.over;
node[this.PLANNER_ESTIMATE_FACTOR] = node[this.PLAN_ROWS_PROP] / node[this.ACTUAL_ROWS_PROP];
}
}
}
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