hikari, tomcat 모니터링 코드 추가 #40
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dependency submission code removed
merging main retry
WalkthroughThis update introduces two new monitoring components for HikariCP and Tomcat thread pools, adds Micrometer dependencies to the build, and revises logging and service injection in the Changes
Sequence Diagram(s)sequenceDiagram
participant Scheduler
participant HikariCPMonitor
participant HikariDataSource
participant HikariPoolMXBean
Scheduler->>HikariCPMonitor: Trigger logHikariStatus() (every 60s)
HikariCPMonitor->>HikariDataSource: getHikariPoolMXBean()
HikariCPMonitor->>HikariPoolMXBean: Retrieve pool stats
HikariCPMonitor->>Scheduler: Log pool stats to console
sequenceDiagram
participant Scheduler
participant TomcatThreadMonitor
participant ServletWebServerApplicationContext
participant TomcatWebServer
participant Connector
participant ProtocolHandler
participant ThreadPoolExecutor
Scheduler->>TomcatThreadMonitor: Trigger logTomcatThreadPoolStatus() (every 60s)
TomcatThreadMonitor->>ServletWebServerApplicationContext: getWebServer()
TomcatThreadMonitor->>TomcatWebServer: getTomcat().getConnector()
TomcatThreadMonitor->>Connector: getProtocolHandler()
TomcatThreadMonitor->>ProtocolHandler: getExecutor()
TomcatThreadMonitor->>ThreadPoolExecutor: Retrieve thread pool stats
TomcatThreadMonitor->>Scheduler: Log thread pool stats to console
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Actionable comments posted: 4
🧹 Nitpick comments (4)
src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java (1)
19-19: Fix comment to match actual execution intervalThe comment states "10초마다 상태 출력" (output every 10 seconds), but the
fixedRateis set to 1000ms (1 second). Either adjust the comment or the execution interval to ensure they match.- @Scheduled(fixedRate = 1000) // 10초마다 상태 출력 + @Scheduled(fixedRate = 1000) // 1초마다 상태 출력src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (3)
23-23: Fix comment to match actual execution intervalThe comment states "10초마다 출력" (output every 10 seconds), but the
fixedRateis set to 1000ms (1 second). Either adjust the comment or the execution interval to ensure they match.- @Scheduled(fixedRate = 1000) // 10초마다 출력 + @Scheduled(fixedRate = 1000) // 1초마다 출력
23-23: Consider less frequent monitoring in productionRunning this monitoring task every second might generate excessive logs and cause unnecessary overhead. Consider a less frequent interval (e.g., 30 seconds or 1 minute) or making the interval configurable.
- @Scheduled(fixedRate = 1000) // 10초마다 출력 + @Scheduled(fixedRate = 60000) // 1분마다 출력
24-45: Add logging when expected components aren't foundThe method has several instanceof checks that could fail silently. Consider adding log messages when the expected components aren't available to aid in troubleshooting.
public void logTomcatThreadPoolStatus() { if (context.getWebServer() instanceof TomcatWebServer tomcatWebServer) { Connector connector = tomcatWebServer.getTomcat().getConnector(); ProtocolHandler handler = connector.getProtocolHandler(); if (handler instanceof AbstractProtocol<?> protocol) { Executor executor = protocol.getExecutor(); if (executor instanceof ThreadPoolExecutor threadPoolExecutor) { // existing code... + } else { + log.debug("Tomcat executor is not an instance of ThreadPoolExecutor"); } + } else { + log.debug("Tomcat protocol handler is not an instance of AbstractProtocol"); } + } else { + log.debug("Web server is not an instance of TomcatWebServer"); } }
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📒 Files selected for processing (7)
build.gradle(1 hunks)src/main/java/com/example/Jinus/controller/DietController.java(1 hunks)src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java(1 hunks)src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java(1 hunks)src/main/java/com/example/Jinus/service/diet/DietQueryService.java(0 hunks)src/main/java/com/example/Jinus/service/userInfo/CollegeService.java(0 hunks)src/main/java/com/example/Jinus/service/userInfo/UserService.java(1 hunks)
💤 Files with no reviewable changes (2)
- src/main/java/com/example/Jinus/service/userInfo/CollegeService.java
- src/main/java/com/example/Jinus/service/diet/DietQueryService.java
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🧬 Code Graph Analysis (2)
src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java (1)
src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (1)
Component(14-47)
src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (1)
src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java (1)
Component(9-35)
🔇 Additional comments (6)
build.gradle (1)
49-51: Good addition of Micrometer dependencies for monitoringThe addition of Micrometer Core and Prometheus registry dependencies complements the existing actuator dependency and provides the foundation for the new monitoring components being introduced. This will enable better observability of the application's connection pools and thread usage.
src/main/java/com/example/Jinus/service/userInfo/UserService.java (1)
41-48: Appropriate removal of test methodCommenting out the
selectCampusIdTestmethod makes sense now that proper HikariCP monitoring is being implemented. This method was likely used for testing connection pool behavior manually, but the new monitoring components provide a more systematic approach.src/main/java/com/example/Jinus/controller/DietController.java (4)
11-13: Appropriate logger imports added.The imports for SLF4J logging are correctly added to support the new logging functionality.
18-19: Good refactoring of service dependency and logger implementation.The change from presumably
dietServiceV2todietServicealigns with the broader service layer refactoring mentioned in the PR summary. The static final logger is properly initialized following SLF4J best practices.
23-25: Thread monitoring enhancement looks good.Adding thread name logging is valuable for monitoring and troubleshooting, especially in a multi-threaded environment like Spring. This change aligns well with the PR objective of adding monitoring capabilities.
26-26: Service method call updated to match refactored service.The method call has been appropriately updated to use the refactored service.
| if (dataSource != null) { | ||
| HikariPoolMXBean poolMXBean = dataSource.getHikariPoolMXBean(); | ||
|
|
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🛠️ Refactor suggestion
Add null check for poolMXBean
While there's a null check for the dataSource, there's no check for poolMXBean before accessing its methods, which could lead to a NullPointerException.
if (dataSource != null) {
HikariPoolMXBean poolMXBean = dataSource.getHikariPoolMXBean();
+
+ if (poolMXBean == null) {
+ log.warn("HikariPoolMXBean is null, cannot monitor connection pool");
+ return;
+ }
src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java
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Actionable comments posted: 0
🧹 Nitpick comments (1)
src/main/java/com/example/Jinus/service/cafeteria/CacheService.java (1)
11-11: Consider removing unused import.Since the
@Cacheableannotation is now commented out and no longer used in this class, the import statement could be removed to keep the code clean.-import org.springframework.cache.annotation.Cacheable;
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src/main/java/com/example/Jinus/service/cafeteria/CacheService.java(1 hunks)src/main/java/com/example/Jinus/service/cafeteria/CafeteriaQueryService.java(1 hunks)src/main/java/com/example/Jinus/service/cafeteria/CampusService.java(2 hunks)src/main/java/com/example/Jinus/service/userInfo/CollegeService.java(0 hunks)
💤 Files with no reviewable changes (1)
- src/main/java/com/example/Jinus/service/userInfo/CollegeService.java
✅ Files skipped from review due to trivial changes (2)
- src/main/java/com/example/Jinus/service/cafeteria/CampusService.java
- src/main/java/com/example/Jinus/service/cafeteria/CafeteriaQueryService.java
🔇 Additional comments (2)
src/main/java/com/example/Jinus/service/cafeteria/CacheService.java (2)
58-64:Details
❓ Verification inconclusive
Verify if this change aligns with PR objectives.
This change disables caching for cafeteria listings while the PR title indicates adding monitoring for Hikari and Tomcat. Consider documenting the rationale behind disabling the cache - is it related to performance monitoring, or is it addressing another issue?
🏁 Script executed:
#!/bin/bash # Look for related monitoring code that might explain this change echo "Searching for Hikari/Tomcat monitoring components:" rg -i "hikari|tomcat" --type java src/main/javaLength of output: 2217
Confirm cache removal rationale
I noticed the
@Cacheableannotation ongetCafeteriaList(int campusId)was commented out, effectively disabling caching, while this PR focuses on adding Hikari and Tomcat monitoring. Please document why the cache was turned off here—e.g., is it to simplify performance metrics, avoid stale data during monitoring, or address another issue?• File:
src/main/java/com/example/Jinus/service/cafeteria/CacheService.java
Method:public List<CafeteriaDto> getCafeteriaList(int campusId)If disabling the cache is intentional for the monitoring work, consider adding a brief comment or updating the PR description to capture this decision.
58-61:Details
❓ Verification inconclusive
Caching disabled for getCafeteriaList method.
The Spring caching mechanism has been disabled for the
getCafeteriaListmethod by commenting out the@Cacheableannotation. This means each call will now directly hit the database instead of checking the cache first.
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#!/bin/bash # Check if this is part of a consistent pattern across the codebase # Looking for other commented out @Cacheable annotations in related files echo "Checking for other disabled caching annotations in related services:" rg -A 1 "//\s*@Cacheable" --type java src/main/java/com/example/Jinus/service/Length of output: 1233
Disabled caching across cafeteria-related services
File: src/main/java/com/example/Jinus/service/cafeteria/CacheService.java (Lines 58–61)
// @Cacheable( // value = "cafeteriaList", // key = "#p0", // cacheManager = "contentCacheManager")The
@Cacheableannotation has been commented out for thegetCafeteriaListmethod, and similar annotations are disabled in:
- src/main/java/com/example/Jinus/service/cafeteria/CampusService.java (campusId, campusName)
- src/main/java/com/example/Jinus/service/cafeteria/CafeteriaQueryService.java (cafeteriaId, cafeteriaUrl)
With caching turned off, each call bypasses the cache and hits the database directly. Please confirm this change is intentional and that any performance impacts have been evaluated. If caching is still required, re-enable these annotations or revise your caching strategy.
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Actionable comments posted: 1
🧹 Nitpick comments (3)
src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (3)
25-46: Consider adding error logging for edge casesWhile the code correctly checks for instanceof conditions, it silently does nothing if the web server is not a TomcatWebServer or if the executor is not a ThreadPoolExecutor. Consider adding debug-level logging for these cases to help with troubleshooting.
@Scheduled(fixedRateString = "${monitor.pool.status.rate.ms:60000}") // 상태 출력 주기 (기본 1분) public void logTomcatThreadPoolStatus() { if (context.getWebServer() instanceof TomcatWebServer tomcatWebServer) { Connector connector = tomcatWebServer.getTomcat().getConnector(); ProtocolHandler handler = connector.getProtocolHandler(); if (handler instanceof AbstractProtocol<?> protocol) { Executor executor = protocol.getExecutor(); if (executor instanceof ThreadPoolExecutor threadPoolExecutor) { int max = threadPoolExecutor.getMaximumPoolSize(); int poolSize = threadPoolExecutor.getPoolSize(); int active = threadPoolExecutor.getActiveCount(); long taskCount = threadPoolExecutor.getTaskCount(); long completedTaskCount = threadPoolExecutor.getCompletedTaskCount(); log.info("[Tomcat 스레드] MaxPoolSize: {}, PoolSize: {}, 활성: {}, TaskCount: {}, 완료: {}", max, poolSize, active, taskCount, completedTaskCount); + } else { + log.debug("Tomcat executor is not a ThreadPoolExecutor"); } + } else { + log.debug("Protocol handler is not an AbstractProtocol"); } + } else { + log.debug("Web server is not a TomcatWebServer"); } }
1-47: Add JavaDoc comments for better documentationConsider adding JavaDoc comments to describe the purpose of the class and the monitoring method. This will help other developers understand what the class does without having to read through the implementation details.
+/** + * Monitors Tomcat thread pool metrics and logs them at a configurable interval. + * This monitor works with the embedded Tomcat server in Spring Boot applications. + */ @Component @Slf4j public class TomcatThreadMonitor { private final ServletWebServerApplicationContext context; public TomcatThreadMonitor(ServletWebServerApplicationContext context) { this.context = context; } + /** + * Logs Tomcat thread pool statistics at a fixed rate. + * Retrieves and logs maximum pool size, current pool size, active thread count, + * total task count, and completed task count. + */ @Scheduled(fixedRateString = "${monitor.pool.status.rate.ms:60000}") // 상태 출력 주기 (기본 1분) public void logTomcatThreadPoolStatus() { // Existing code... } }
1-47: Consider adding Micrometer metrics for monitoring systemsWhile logging metrics is useful, consider also exposing these metrics via Micrometer so they can be collected by monitoring systems like Prometheus. This would allow for better visualization, alerting, and long-term trend analysis.
// Add these imports import io.micrometer.core.instrument.MeterRegistry; import io.micrometer.core.instrument.Gauge; import jakarta.annotation.PostConstruct; // In the class, add a MeterRegistry field and register gauges private final MeterRegistry meterRegistry; public TomcatThreadMonitor(ServletWebServerApplicationContext context, MeterRegistry meterRegistry) { this.context = context; this.meterRegistry = meterRegistry; } @PostConstruct public void registerMetrics() { Gauge.builder("tomcat.threads.max", this, monitor -> monitor.getMaxThreads()) .description("Maximum thread pool size") .register(meterRegistry); // Add similar gauges for other metrics } private int getMaxThreads() { // Similar logic to extract the max threads value // Return -1 if not available }
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src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java(1 hunks)src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java
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src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (2)
src/test/java/com/example/Jinus/service/userInfo/UserServiceHikariCPTest.java (1)
Slf4j(17-74)src/main/java/com/example/Jinus/monitor/HikariCPMonitor.java (1)
Component(10-35)
🔇 Additional comments (3)
src/main/java/com/example/Jinus/monitor/TomcatThreadMonitor.java (3)
1-24: Good class structure with proper dependency injectionThe class is well-structured with appropriate component annotation and constructor-based dependency injection. This is a good practice compared to field injection.
25-26: Appropriate use of configurable schedulingUsing
fixedRateStringwith a property placeholder allows for external configuration of the monitoring interval. The default value of 60,000ms (1 minute) is a reasonable choice for production monitoring.
27-40: Good use of pattern matching for instanceof (Java 16+ feature)The code makes effective use of Java's pattern matching for instanceof (line 27 and 31), which makes the code more concise and readable compared to traditional casting.
| log.info("[Tomcat 스레드] MaxPoolSize: {}, PoolSize: {}, 활성: {}, TaskCount: {}, 완료: {}", | ||
| + max, poolSize, active, taskCount, completedTaskCount); | ||
| } |
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Remove the unexpected '+' character in the logging statement
There's an unexpected '+' character at the beginning of line 42 that will cause a compilation error.
log.info("[Tomcat 스레드] MaxPoolSize: {}, PoolSize: {}, 활성: {}, TaskCount: {}, 완료: {}",
- + max, poolSize, active, taskCount, completedTaskCount);
+ max, poolSize, active, taskCount, completedTaskCount);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| log.info("[Tomcat 스레드] MaxPoolSize: {}, PoolSize: {}, 활성: {}, TaskCount: {}, 완료: {}", | |
| + max, poolSize, active, taskCount, completedTaskCount); | |
| } | |
| log.info("[Tomcat 스레드] MaxPoolSize: {}, PoolSize: {}, 활성: {}, TaskCount: {}, 완료: {}", | |
| max, poolSize, active, taskCount, completedTaskCount); |
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