APPENG-1147: Log shutdown signal received with signal handler (#48)

* APPENG-1147: Log shutdown signal received with signal handler

* APPENG-1147: Remove signals that cannot be overriden by application

* APPENG-1147: additional log for registering signal handlers

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres
 to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.15.2] - 2025-02-19
+
+### Added
+* Added logging for shutdown signals received.
+
 ## [2.15.1] - 2024-12-05
 
 ### Changed

core/src/main/java/com/transferwise/common/gracefulshutdown/GracefulShutdowner.java

@@ -13,6 +13,7 @@
 import org.springframework.context.SmartLifecycle;
 import org.springframework.context.support.DefaultLifecycleProcessor;
 import org.springframework.core.annotation.AnnotationAwareOrderComparator;
+import sun.misc.Signal;
 
 @Slf4j
 public class GracefulShutdowner implements SmartLifecycle, InitializingBean {
@@ -46,6 +47,7 @@ public void afterPropertiesSet() {
   @Override
   public void start() {
     running = true;
+    initShutdownSignalLogging(new Signal("INT"), new Signal("TERM"));
 
     validateStrategies();
 
@@ -61,6 +63,13 @@ public void start() {
     }
   }
 
+  protected void initShutdownSignalLogging(Signal... signals) {
+    for (var signal : signals) {
+      log.info("Registering shutdown signal handler for signal '{}'", signal.toString());
+      Signal.handle(signal, sig -> log.info("Received signal {}", sig.toString()));
+    }
+  }
+
   protected void validateStrategies() {
     var registeredStrategies = ImmutableSet.copyOf(gracefulShutdownStrategiesRegistry.getStrategies());
     var strategiesInAppContext = ImmutableSet.copyOf(applicationContext.getBeansOfType(GracefulShutdownStrategy.class).values());

gradle.properties

@@ -1 +1 @@
-version=2.15.1
+version=2.15.2