feat: 비동기처리-threadPool 적용 & 이슈리스트 DB조회 로직 구현

Author: sokft

src/main/java/Capstone/FOSSistant/global/config/AsyncConfig.java

@@ -0,0 +1,20 @@
+package Capstone.FOSSistant.global.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+@Configuration
+public class AsyncConfig {
+
+    @Bean("classifierExecutor")
+    public ThreadPoolTaskExecutor classifierExecutor() {
+        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
+        executor.setCorePoolSize(10);       // 최소 10개 스레드 유지
+        executor.setMaxPoolSize(50);        // 최대 50개 스레드까지 확장
+        executor.setQueueCapacity(100);     // 작업 대기 큐 크기
+        executor.setThreadNamePrefix("AI-Clf-"); // 스레드 이름 접두어
+        executor.initialize();
+        return executor;
+    }
+}

src/main/java/Capstone/FOSSistant/global/service/customAI/AIClassifierClient.java

@@ -24,7 +24,7 @@ public class AIClassifierClient {
     private final ObjectMapper objectMapper = new ObjectMapper();
 
     public Mono<String> classify(String title, String body) {
-        String shortBody = (body == null || body.isBlank()) ? "(no description provided)" : body;
+        String shortBody = (body == null || body.isBlank()) ? "" : body;
         shortBody = shortBody.replaceAll("(?s)```.*?```", "");
 
         long start = System.currentTimeMillis();
@@ -81,7 +81,7 @@ public Mono<String> classifyBatch(List<String[]> titleBodyList) {
                 .map(pair -> Map.of(
                         "title", pair[0],
                         "body", (pair[1] == null || pair[1].isBlank())
-                                ? "(no description provided)"
+                                ? ""
                                 : pair[1].replaceAll("(?s)```.*?```", "")
                 ))
                 .toList();
@@ -107,7 +107,7 @@ public Mono<String> classifyBatch(List<String[]> titleBodyList) {
                 .retrieve()
                 .bodyToMono(String.class)
                 .timeout(Duration.ofSeconds(30))
-                .doOnSuccess(result -> {
+                .doOnSuccess( result -> {
                     long end = System.currentTimeMillis();
                     log.info("[AI Batch API 호출 + 응답 수신 시간] {}ms", (end - start));
                 })
@@ -128,4 +128,17 @@ public Mono<String> classifyBatch(List<String[]> titleBodyList) {
                     return Mono.just("{\"results\": []}");
                 });
     }
+    /**
+     * 단건 기본값: difficulty="misc" 하나를 리턴
+     */
+    public Mono<String> defaultSingleResult() {
+        return Mono.just("{\"results\":[{\"difficulty\":\"misc\",\"score\":0.0}]}");
+    }
+
+    /**
+     * 배치 기본값: 빈 리스트
+     */
+    public Mono<String> defaultBatchResult() {
+        return Mono.just("{\"results\":[]}");
+    }
 }