first commit

core-api/build.gradle.kts

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+plugins {
+    id("java")
+}
+
+group = "de.kentoj.scrow"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

core-api/src/main/java/de/kentoj/scrow/services/EconomyService.java

@@ -0,0 +1,28 @@
+package de.kentoj.scrow.services;
+
+import org.jetbrains.annotations.NotNull;
+import reactor.core.publisher.Mono;
+
+import java.util.UUID;
+
+public interface EconomyService {
+
+    Mono<@NotNull Integer> getCoins(UUID playerId);
+
+    /**
+     * @param playerId uuid of player
+     * @return new coins balance
+     */
+    Mono<@NotNull Integer> depositCoins(UUID playerId, int amount);
+
+    /**
+     * @param playerId uuid of player
+     * @return true on success, false on insufficient funds
+     */
+    Mono<@NotNull Boolean> tryWithdrawCoins(UUID playerId, int amount);
+
+    /**
+     * @param playerId uuid of player
+     */
+    Mono<@NotNull Void> setCoins(UUID playerId, int amount);
+}