feat(Events): Fire event on state change (#5410)

* Fix a problem where getVersionMetaData API operation was not properly returning the modifiedOn

* Fire an event when a version state changes

* spotless:apply

app/src/main/java/io/apicurio/registry/events/ArtifactVersionStateChanged.java

@@ -0,0 +1,40 @@
+package io.apicurio.registry.events;
+
+import io.apicurio.registry.storage.dto.OutboxEvent;
+import io.apicurio.registry.types.VersionState;
+import org.json.JSONObject;
+
+import java.util.UUID;
+
+import static io.apicurio.registry.storage.StorageEventType.ARTIFACT_VERSION_STATE_CHANGED;
+
+public class ArtifactVersionStateChanged extends OutboxEvent {
+
+    private final JSONObject eventPayload;
+
+    private ArtifactVersionStateChanged(String id, String aggregateId, JSONObject eventPayload) {
+        super(id, aggregateId);
+        this.eventPayload = eventPayload;
+    }
+
+    public static ArtifactVersionStateChanged of(String groupId, String artifactId, String version,
+            VersionState oldState, VersionState newState) {
+        String id = UUID.randomUUID().toString();
+        JSONObject jsonObject = new JSONObject();
+        jsonObject.put("id", id).put("groupId", groupId).put("artifactId", artifactId).put("version", version)
+                .put("oldState", oldState.name()).put("newDate", newState.name())
+                .put("eventType", ARTIFACT_VERSION_STATE_CHANGED.name());
+
+        return new ArtifactVersionStateChanged(id, groupId + "-" + artifactId + "-" + version, jsonObject);
+    }
+
+    @Override
+    public String getType() {
+        return ARTIFACT_VERSION_STATE_CHANGED.name();
+    }
+
+    @Override
+    public JSONObject getPayload() {
+        return eventPayload;
+    }
+}

app/src/main/java/io/apicurio/registry/storage/StorageEventType.java

@@ -5,5 +5,5 @@ public enum StorageEventType {
     /**
      * The READY event type MUST be fired only once.
      */
-    READY, ARTIFACT_CREATED, ARTIFACT_DELETED, ARTIFACT_METADATA_UPDATED, GROUP_CREATED, GROUP_DELETED, GROUP_METADATA_UPDATED, ARTIFACT_VERSION_CREATED, ARTIFACT_VERSION_METADATA_UPDATED, ARTIFACT_VERSION_DELETED, GLOBAL_RULE_CONFIGURED, GROUP_RULE_CONFIGURED, ARTIFACT_RULE_CONFIGURED
+    READY, ARTIFACT_CREATED, ARTIFACT_DELETED, ARTIFACT_METADATA_UPDATED, GROUP_CREATED, GROUP_DELETED, GROUP_METADATA_UPDATED, ARTIFACT_VERSION_CREATED, ARTIFACT_VERSION_METADATA_UPDATED, ARTIFACT_VERSION_DELETED, GLOBAL_RULE_CONFIGURED, GROUP_RULE_CONFIGURED, ARTIFACT_RULE_CONFIGURED, ARTIFACT_VERSION_STATE_CHANGED
 }

app/src/main/java/io/apicurio/registry/storage/impl/sql/AbstractSqlRegistryStorage.java

@@ -13,6 +13,7 @@
 import io.apicurio.registry.events.ArtifactVersionCreated;
 import io.apicurio.registry.events.ArtifactVersionDeleted;
 import io.apicurio.registry.events.ArtifactVersionMetadataUpdated;
+import io.apicurio.registry.events.ArtifactVersionStateChanged;
 import io.apicurio.registry.events.GlobalRuleConfigured;
 import io.apicurio.registry.events.GroupCreated;
 import io.apicurio.registry.events.GroupDeleted;
@@ -2064,6 +2065,9 @@ public void updateArtifactVersionState(String groupId, String artifactId, String
                 removeVersionFromBranchRaw(handle, gav, BranchId.DRAFTS);
             }
 
+            outboxEvent.fire(SqlOutboxEvent.of(
+                    ArtifactVersionStateChanged.of(groupId, artifactId, version, currentState, newState)));
+
             return null;
         });
     }