jboss drools expert (ru)
TRANSCRIPT
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ВИКТОР ПОЛИЩУК
JBoss Drools Expert
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Виктор Полищук
10+ лет коммерческой разработки8+ лет работы с Java3+ лет программирования на Drools Участвовал/видел 50+ «проблемных» (из-за высокой нагружености логикой) проектов
0 из 9 «провальных» проектов на Drools
Технический лидер в Infopulse, UkraineКонтрактор в BICS, Belgium
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«Простой» «Хитрый»
2.00 за SMS
0.00 за первые 10 SMS/день
1.50 за SMS внутри сети
2.50 за SMS
JokerMobile™
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Модель Данных: Customer
public class Customer {String number;Tariff tariff;
}
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Модель Данных: SMS
public class Sms {String sender;String receiver;DateTime sent;
}
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Модель Данных: BillingRecord
public class BillingRecord {Customer customer;BigDecimal price;Sms sms;
}
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Java FTW
Пишем God класс Делим логику на стратегии по тарифамДелим логику на атомарные стратегии Что-то еще
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API
public interface TariffStrategy {Collection<BillingRecord> calculate(
Customer customer, Interval interval
);}
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«Хитрая» Стратегия: стр. 1
Collection<Sms> messages = dao.findBySender(customer.getNumber(), interval); Collection<SmsBillingRecord> records = new ArrayList<SmsBillingRecord>();Map<DateTime, List<Sms>> dailyMap = new HashMap<DateTime, List<Sms>>(); for (Sms sms : messages) { DateTime date = sms.getSent().withMillisOfDay(0); List<Sms> collection = dailyMap.get(date); if (collection == null) { collection = new ArrayList<Sms>(); dailyMap.put(date, collection); } collection.add(sms);}
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«Хитрая» Стратегия: стр. 2
for (List<Sms> value : dailyMap.values()) { Collections.sort(value, SMSComparator.INSTANCE); for (int i = 0; i < value.size(); i++) { Sms sms = value.get(i); if (i < 10) { records.add(new BillingRecord(customer,
BigDecimal.ZERO, sms)); } else if (dao.findByNumber(sms.getReceiver()) != null) { records.add(new BillingRecord(customer,
new BigDecimal("1.5"), sms)); } else { records.add(new BillingRecord(customer,
new BigDecimal("2.5"), sms)); } }} return records;
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ПРАЗДНИК
Полный Успех
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Бонус
Может быть применен к любому тарифуМогут складываться друг с другомПравила наложения могут быть уникальны
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Модель Данных: Customer+
public class Customer {String number;Tariff tariff;Collection<Bonus> bonuses;
}
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Бонус: «Двадцать»
Платеж 100.00 в месяцСкидка 20% на все SMS
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Модель Данных: BillingRecord+
public abstract class BillingRecord {Customer customer;BigDecimal price;
}public class SmsBillingRecord
extends BillingRecord {Sms sms;
}public class FixedBillingRecord
extends BillingRecord {}
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Java FTW
Растим God классПишем все в стратегииВыносим цены в некий PriceManagerСоздаем слой модифицирующий BillingRecord
Что-то еще
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БЕСПОКОЙСТВО
Частичный Успех
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Бонус: «Два по Пятьдесят»
После порога в 50 SMS в день:Удваиваем количество бесплатных SMSСкидка 50% на последующие SMS до конца дня
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Java WTF
Убиваемся о God классМеняем PriceManagerДобавляем LimitManagerМеняем «модифицирующий» слой:
Передаем доп.информацию про стратегии и бонусы Усложняем логику
Начинаем сначалаЧто-то еще
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ДЕПРЕССИЯ... НЕНАВИСТЬ... РАЗДРАЖЕНИЕ... МИЗАНТРОПИЯ...
ЗАМКНУТОСТЬ... УСТАЛОСТЬ... АПАТИЯ...
Я Сделал Все Что Мог
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Drools Expert
Продукционная експертная системаПостроена на базе «Rete-сети»Отличная документацияОткрытый кодБесплатнаяПоддерживается JBoss
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Глоссарий
Working Memory
Rule Engine
Knowledge Base
Fact
Fact
Fact
Rule
Rule
Rule
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Базовый Синтаксис
rule “<Имя правила>”<опции>when
<условие или LHS>then
<следствие или RHS>end
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Drools: Тариф «Простой»
rule “Billing: charge -Simple-”when $customer : Customer(tariff==Tariff.SIMPLE) Charge($sms : sms, customer==$customer)then log.info(“Charge {} as {}”, $sms, 2.0); insertLogical(
new SmsBillingRecord($customer,2.0,$sms) );end
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Charge?
public class Charge {Customer customer;Sms sms;
}<или>
declare Chargecustomer : Customer @keysms : Sms @key
end
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Drools: А Кто Платить Будет!?…
rule “Default: sender is in charge”when $period : Interval() $sms : Sms($sender : sender, $period.contains(sent)) $customer : Customer(number==$sender) not Charge(customer!=$customer, sms==$sms)
then log.info(“Mark {} as regular”, $sms); insertLogical(new Charge($customer, $sms));end
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Drools: Тариф «Хитрый» стр. 1
rule “Tariff -Smart-: free SMS”when Day($period : interval) $customer : Customer(tariff==Tariff.SMART) Charge($sms : sms, customer==$customer,
$period.contains(sms.sent)) accumulate($c : Charge(customer==$customer,
$period.contains(sms.sent),!sms.sent.isAfter($sms.sent));
$count : count( $c ); $count<=10)then log.info(“Mark {} as free”, $sms); insertLogical(new ChargeAsFree($customer, $sms));end
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Drools : Тариф «Хитрый» стр. 2
rule “Tariff -Smart-: local SMS”when Day($period : interval) $customer : Customer(tariff==Tariff.SMART) Charge($sms : sms, customer==$customer,
$period.contains(sms.sent)) not ChargeAsFree(customer==$customer, sms==$sms) exists Customer(number==$sms.receiver)
then log.info(“Mark {} as local”, $sms); insertLogical(new ChargeAsLocal($customer, $sms));end
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Drools: Тариф «Хитрый» стр. 3
rule “Billing: free of charge”when $customer : Customer() ChargeAsFree($sms : sms, $customer==customer)
then log.info(“Charge {} as {}”, $sms, 0.0); insertLogical(
new SmsBillingRecord($customer, 0.0, $sms) );end
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Drools: Тариф «Хитрый» стр. 4
rule “Billing: charge local in –Smart-”when $customer : Customer(tariff==Tariff.SMART) ChargeAsLocal($sms : sms, customer==$customer) not ChargeAsFree(sms==$sms)
then log.info(“Charge {} as {}”, $sms, 1.5); insertLogical(
new SmsBillingRecord($customer, 1.5, $sms) );end
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Drools: Тариф «Хитрый» стр. 5
rule “Billing: charge others in –Smart-”when $customer : Customer(tariff==Tariff.SMART) Charge($sms : sms, customer==$customer) not ChargeAsFree(sms==$sms) not ChargeAsLocal(sms==$sms)
then log.info(“Charge {} as {}”, $sms, 2.5); insertLogical(
new SmsBillingRecord($customer, 2.5, $sms) );end
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Drools: Бонус «Двадцать»
rule “Subscription -20%-: refund”when $customer : Customer(bonuses contains Bonus.TWENTY) Charge($sms : sms, customer==$customer) not ChargeAsFree(sms==$sms) not Modifier(sms==$sms, modifier<0.8)
then log.info(“Add modifier {} to {}”, 0.8, $sms); insertLogical(new Modifier($sms, 0.8));end
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Drools: Тариф «Хитрый» стр. 4+
rule “Billing: charge local in –Smart-”when $customer : Customer(tariff==Tariff.SMART) ChargeAsLocal($sms : sms, customer==$customer) not ChargeAsFree(sms==$sms) Modifier($modifier : modifier, sms==$sms)
then BigDecimal price = $modifier * 1.5; log.info(“Charge {} as {}”, $sms, price); insertLogical(
new SmsBillingRecord($customer, price, $sms) );end
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ВЫ ЧТО, ВСЕ ЕЩЕ КОДИТЕ БИЗНЕС-ПРАВИЛА?
Domain Specific Language
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Drools: Тариф «Хитрый» стр. 4+
rule “Billing: charge local in –Smart-”when $customer : Customer(tariff==Tariff.SMART) ChargeAsLocal($sms : sms, customer==$customer) not ChargeAsFree(customer==$customer, sms==$sms) Modifier($modifier : modifier, sms==$sms)
then BigDecimal price = $modifier * 1.5; log.info(“Charge {} as {}”, $sms, price); insertLogical(
new SmsBillingRecord($customer, price, $sms) );end
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DSL: Тариф «Хитрый» стр. 4+
rule “Billing: charge local in –Smart-”when Find a customer - with Tariff.SMART Find customer’s local SMS Proceed only if it is not free Find an SMS modifier
then Create SMS billing record with base price: 1.5end
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DSL Словарь
[when] Find a customer = $customer : Customer()[when] - with {tariff} = tariff=={tariff}[when] Find customer’s local SMS = ChargeAsLocal($sms : sms, customer==$customer)
...
...
...
...
...[then] Create SMS billing record with base price: {base} = BigDecimal price = $modifier * {base}; log.info(“Charge {} as {}”, $sms, price); insertLogical(new SmsBillingRecord($customer, price, $sms));
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ЛЕКАРСТВО ОТ РАБСТВА
Тестирование
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Подсказки
Работаем с production knowledge baseГотовим крошечные тестовые данныеВыбираем дружелюбные критерии прохождения
Тестируем business case, а не DroolsPerformance тесты тоже важны
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Тестируем Drools:
private final Customer callee = new Customer(“007”, Tariff.SIMPLE);private final Interval billingPeriod = new Interval(
new DateTime(2013, 9, 1, 0, 0, 0, 0),new DateTime(2013, 10, 1, 0, 0, 0, 0)
);@Testpublic void testSimple() { DateTime instant = new DateTime(2013, 9, 20, 4, 40, 11); BigDecimal expectedResult = new BigDecimal(“2.0”); BigDecimal actualResult = executeGetAmount(callee, generateSMS(“007”, “any”, instant, 0, 1), billingPeriod, callee );
assertEquals(expectedResult, actualResult);}
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ЕЩЕ ЧУТЬ-ЧУТЬ И ПЕРЕРЫВ
Итоги
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Достоинства
Отделение логики от «бизнес-логики»Независимые правилаМенять правила может даже аналитикТесты свободные от Mock-ов«Теплый, ламповый» Java кодПриемлемая производительность... и другая куча «плюшек»
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Смотри Также
JBoss Drools GuvnorJBoss Drools FusionOptaPlanner (JBoss Drools Planner)jBPM
http://www.jboss.org/drools/http://www.jcp.org/en/jsr/detail?id=94https://github.com/victor-cr/drools-joker-mobile
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ЗА ВНИМАНИЕ
Спасибо