Fast!

.gitignore

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+*.iml
+.idea/
+target/

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>co.wuunder</groupId>
+    <artifactId>rule-engine</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>5.0.3</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/co/wuunder/rule_engine/Address.java

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+package co.wuunder.rule_engine;
+
+public class Address {
+    public final String country;
+    public final String business;
+
+    public Address(String country, String business) {
+        this.country = country;
+        this.business = business;
+    }
+
+    public String type() {
+        if(this.business == null || this.business.isEmpty()) {
+            return "consumer";
+        } else {
+            return "business";
+        }
+    }
+}

src/main/java/co/wuunder/rule_engine/RandomRules.java

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+package co.wuunder.rule_engine;
+
+import java.util.List;
+import java.util.Random;
+import java.util.stream.IntStream;
+
+import static java.util.stream.Collectors.toList;
+
+public class RandomRules {
+    private static final Random random = new Random(System.currentTimeMillis());
+
+    public static List<RateRule> randomRules(int numberOfRules) {
+        return IntStream.range(0, numberOfRules)
+                .mapToObj(RandomRules::randomRule)
+                .collect(toList());
+    }
+
+    private static RateRule randomRule(int _n) {
+        return new RateRule(random.nextInt(), random.nextInt(), random.nextInt(), random.nextInt() % 2 == 0, random.nextInt(), "NL", "consumer", "NL", "consumer");
+    }
+}

src/main/java/co/wuunder/rule_engine/RateRule.java

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+package co.wuunder.rule_engine;
+
+public class RateRule {
+    public final int minWeight;
+    public final int maxWeight;
+    public final int maxLengthHeightWidth;
+    public final boolean isReturn;
+    public final int maxDimension;
+    public final String pickupCountry;
+    public final String pickupAddressType;
+    public final String deliveryCountry;
+    public final String deliveryAddressType;
+
+    public RateRule(int minWeight, int maxWeight, int maxLengthHeightWidth, boolean isReturn,
+                    int maxDimension, String pickupCountry, String pickupAddressType, String deliveryCountry,
+                    String deliveryAddressType) {
+        this.minWeight = minWeight;
+        this.maxWeight = maxWeight;
+        this.maxLengthHeightWidth = maxLengthHeightWidth;
+        this.isReturn = isReturn;
+        this.maxDimension = maxDimension;
+        this.pickupCountry = pickupCountry;
+        this.pickupAddressType = pickupAddressType;
+        this.deliveryCountry = deliveryCountry;
+        this.deliveryAddressType = deliveryAddressType;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        RateRule rateRule = (RateRule) o;
+
+        if (minWeight != rateRule.minWeight) return false;
+        if (maxWeight != rateRule.maxWeight) return false;
+        if (maxLengthHeightWidth != rateRule.maxLengthHeightWidth) return false;
+        if (isReturn != rateRule.isReturn) return false;
+        if (maxDimension != rateRule.maxDimension) return false;
+        if (pickupCountry != null ? !pickupCountry.equals(rateRule.pickupCountry) : rateRule.pickupCountry != null)
+            return false;
+        if (pickupAddressType != null ? !pickupAddressType.equals(rateRule.pickupAddressType) : rateRule.pickupAddressType != null)
+            return false;
+        if (deliveryCountry != null ? !deliveryCountry.equals(rateRule.deliveryCountry) : rateRule.deliveryCountry != null)
+            return false;
+        return deliveryAddressType != null ? deliveryAddressType.equals(rateRule.deliveryAddressType) : rateRule.deliveryAddressType == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = minWeight;
+        result = 31 * result + maxWeight;
+        result = 31 * result + maxLengthHeightWidth;
+        result = 31 * result + (isReturn ? 1 : 0);
+        result = 31 * result + maxDimension;
+        result = 31 * result + (pickupCountry != null ? pickupCountry.hashCode() : 0);
+        result = 31 * result + (pickupAddressType != null ? pickupAddressType.hashCode() : 0);
+        result = 31 * result + (deliveryCountry != null ? deliveryCountry.hashCode() : 0);
+        result = 31 * result + (deliveryAddressType != null ? deliveryAddressType.hashCode() : 0);
+        return result;
+    }
+}

src/main/java/co/wuunder/rule_engine/RuleEngine.java

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+package co.wuunder.rule_engine;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.BiPredicate;
+
+import static java.util.stream.Collectors.toList;
+
+public class RuleEngine {
+
+    private final List<RateRule> rules;
+    private final List<BiPredicate<Shipment, RateRule>> functions;
+
+    public RuleEngine(List<RateRule> rules) {
+        this.rules = rules;
+        this.functions = Arrays.asList(
+                Rules::matchesHeight,
+                Rules::matchesLength,
+                Rules::matchesWeight,
+                Rules::matchesWidth,
+                Rules::matchesReturn,
+                Rules::matchesDimensions,
+                Rules::matchesPickupCountry,
+                Rules::matchesPickupAddressType,
+                Rules::matchesDeliveryCountry,
+                Rules::matchesDeliveryAddressType
+        );
+    }
+
+    public List<RateRule> generateRules(Shipment shipment) {
+        return rules.stream().filter(rule -> matchesRule(shipment, rule)).collect(toList());
+    }
+
+    private boolean matchesRule(Shipment shipment, RateRule rateRule) {
+        return functions.stream().allMatch(f -> f.test(shipment, rateRule));
+    }
+}

src/main/java/co/wuunder/rule_engine/Rules.java

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+package co.wuunder.rule_engine;
+
+public class Rules {
+
+    public static boolean matchesWeight(Shipment shipment, RateRule rateRule) {
+        return shipment.weight >= rateRule.minWeight && shipment.weight <= rateRule.maxWeight;
+    }
+
+    public static boolean matchesLength(Shipment shipment, RateRule rateRule) {
+        return shipment.length < rateRule.maxLengthHeightWidth;
+    }
+
+    public static boolean matchesWidth(Shipment shipment, RateRule rateRule) {
+        return shipment.width < rateRule.maxLengthHeightWidth;
+    }
+
+    public static boolean matchesHeight(Shipment shipment, RateRule rateRule) {
+        return shipment.height < rateRule.maxLengthHeightWidth;
+    }
+
+    public static boolean matchesDimensions(Shipment shipment, RateRule rateRule) {
+        return shipment.dimensions() <= rateRule.maxDimension;
+    }
+
+    public static boolean matchesPickupCountry(Shipment shipment, RateRule rateRule) {
+        return shipment.pickupCountry().equals(rateRule.pickupCountry);
+    }
+
+    public static boolean matchesPickupAddressType(Shipment shipment, RateRule rateRule) {
+        return shipment.pickupAddressType().equals(rateRule.pickupAddressType);
+    }
+
+    public static boolean matchesDeliveryCountry(Shipment shipment, RateRule rateRule) {
+        return shipment.deliveryCountry().equals(rateRule.deliveryCountry);
+    }
+
+    public static boolean matchesDeliveryAddressType(Shipment shipment, RateRule rateRule) {
+        return shipment.deliveryAddressType().equals(rateRule.deliveryAddressType);
+    }
+
+    public static boolean matchesReturn(Shipment shipment, RateRule rateRule) {
+        return shipment.isReturn == rateRule.isReturn;
+    }
+}

src/main/java/co/wuunder/rule_engine/Shipment.java

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+package co.wuunder.rule_engine;
+
+public class Shipment {
+    public final int weight;
+    public final int width;
+    public final int height;
+    public final int length;
+    public final boolean isReturn;
+    public final boolean dropoff;
+    public final Address pickupAddress;
+    public final Address deliveryAddress;
+
+    public Shipment(int weight, int width, int height, int length, boolean isReturn, boolean dropoff,
+                    Address pickupAddress, Address deliveryAddress) {
+        this.weight = weight;
+        this.width = width;
+        this.height = height;
+        this.length = length;
+        this.isReturn = isReturn;
+        this.dropoff = dropoff;
+        this.pickupAddress = pickupAddress;
+        this.deliveryAddress = deliveryAddress;
+    }
+
+    public String deliveryCountry() {
+        return this.deliveryAddress.country;
+    }
+
+    public String deliveryAddressType() {
+        if(this.dropoff) {
+            return "parcelshop";
+        }
+
+        return this.deliveryAddress.type();
+    }
+
+    public String pickupCountry() {
+        return this.pickupAddress.country;
+    }
+
+    public String pickupAddressType() {
+        if(this.dropoff) {
+            return "parcelshop";
+        }
+
+        return this.pickupAddress.type();
+    }
+
+    public int dimensions() {
+        double dimensions = (2.0 * this.weight) + (2 * this.height) + this.length;
+        return (int)Math.ceil(dimensions);
+    }
+}

src/test/java/PerfTest.java

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+import co.wuunder.rule_engine.Address;
+import co.wuunder.rule_engine.RuleEngine;
+import co.wuunder.rule_engine.Shipment;
+import org.junit.jupiter.api.Test;
+
+import java.util.Random;
+
+import static co.wuunder.rule_engine.RandomRules.*;
+
+public class PerfTest {
+    private final RuleEngine ruleEngine = new RuleEngine(randomRules(100_000));
+
+    @Test
+    public void perf() {
+        long start = System.currentTimeMillis();
+        int numberOfShipments = 50;
+
+        for(int i = 0 ; i < numberOfShipments; i++) {
+            ruleEngine.generateRules(randomShipment());
+        }
+
+        long end = System.currentTimeMillis();
+
+        System.out.println((end - start) / numberOfShipments);
+    }
+
+    private Shipment randomShipment() {
+        Random random = new Random(System.currentTimeMillis());
+        Address pickupAddress = new Address("NL", "");
+        Address deliveryAddress = new Address("NL", "");
+
+        return new Shipment(random.nextInt(), random.nextInt(), random.nextInt(), random.nextInt(), random.nextInt() % 2 == 0, random.nextInt() % 2 == 0, pickupAddress, deliveryAddress);
+    }
+}