Fix singleton events not being labelled as such

src/main/java/org/dependencytrack/event/GitHubAdvisoryMirrorEvent.java

@@ -18,14 +18,23 @@
  */
 package org.dependencytrack.event;
 
-import alpine.event.framework.Event;
+import alpine.event.framework.SingletonCapableEvent;
+
+import java.util.UUID;
 
 /**
  * Defines an event used to start a mirror of GitHub Advisories.
  *
  * @author Steve Springett
  * @since 4.4.0
  */
-public class GitHubAdvisoryMirrorEvent implements Event {
+public class GitHubAdvisoryMirrorEvent extends SingletonCapableEvent {
+
+    private static final UUID CHAIN_IDENTIFIER = UUID.fromString("bc3fbc70-7d80-4840-99c5-2d17d0c222da");
+
+    public GitHubAdvisoryMirrorEvent() {
+        setChainIdentifier(CHAIN_IDENTIFIER);
+        setSingleton(true);
+    }
 
 }

src/main/java/org/dependencytrack/event/InternalComponentIdentificationEvent.java

@@ -18,17 +18,23 @@
  */
 package org.dependencytrack.event;
 
-import alpine.event.framework.Event;
+import alpine.event.framework.SingletonCapableEvent;
+
+import java.util.UUID;
 
 /**
  * Defines an event triggered when internal components should be identified in the entire portfolio.
  *
  * @author nscuro
  * @since 3.7.0
  */
-public class InternalComponentIdentificationEvent implements Event {
+public class InternalComponentIdentificationEvent extends SingletonCapableEvent {
+
+    private static final UUID CHAIN_IDENTIFIER = UUID.fromString("57096d18-fdad-41c7-a59e-925ce7dc3d0e");
 
     public InternalComponentIdentificationEvent() {
+        setChainIdentifier(CHAIN_IDENTIFIER);
+        setSingleton(true);
     }
 
 }

src/main/java/org/dependencytrack/event/OsvMirrorEvent.java

@@ -18,11 +18,20 @@
  */
 package org.dependencytrack.event;
 
-import alpine.event.framework.Event;
+import alpine.event.framework.SingletonCapableEvent;
+
+import java.util.UUID;
 
 /**
  * Defines an event used to start a mirror of Google OSV.
  */
-public class OsvMirrorEvent implements Event {
+public class OsvMirrorEvent extends SingletonCapableEvent {
+
+    private static final UUID CHAIN_IDENTIFIER = UUID.fromString("4133bd23-0e71-418b-a66c-1d8782c51f4d");
+
+    public OsvMirrorEvent() {
+        setChainIdentifier(CHAIN_IDENTIFIER);
+        setSingleton(true);
+    }
 
 }

src/main/java/org/dependencytrack/event/VulnDbSyncEvent.java

@@ -18,8 +18,17 @@
  */
 package org.dependencytrack.event;
 
-import alpine.event.framework.Event;
+import alpine.event.framework.SingletonCapableEvent;
 
-public class VulnDbSyncEvent implements Event {
+import java.util.UUID;
+
+public class VulnDbSyncEvent extends SingletonCapableEvent {
+
+    private static final UUID CHAIN_IDENTIFIER = UUID.fromString("42697563-bc9d-4d3b-b1ed-8b27f3a5aac6");
+
+    public VulnDbSyncEvent() {
+        setChainIdentifier(CHAIN_IDENTIFIER);
+        setSingleton(true);
+    }
 
 }

src/main/java/org/dependencytrack/event/VulnerabilityMetricsUpdateEvent.java

@@ -19,11 +19,22 @@
 package org.dependencytrack.event;
 
 import alpine.event.framework.Event;
+import alpine.event.framework.SingletonCapableEvent;
+
+import java.util.UUID;
 
 /**
  * Defines an {@link Event} used to trigger vulnerability metrics updates.
  *
  * @since 4.6.0
  */
-public class VulnerabilityMetricsUpdateEvent implements Event {
+public class VulnerabilityMetricsUpdateEvent extends SingletonCapableEvent {
+
+    private static final UUID CHAIN_IDENTIFIER = UUID.fromString("915e97b9-c18e-42e8-8a13-b8eddaff50bf");
+
+    public VulnerabilityMetricsUpdateEvent() {
+        setChainIdentifier(CHAIN_IDENTIFIER);
+        setSingleton(true);
+    }
+
 }