preparing to load events

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

bus/src/main/java/de/srsoftware/umbrella/messagebus/events/TaskEvent.java

@@ -10,6 +10,9 @@ import static de.srsoftware.umbrella.messagebus.events.Event.EventType.MEMBER_AD
 
 import de.srsoftware.umbrella.core.constants.Field;
 import de.srsoftware.umbrella.core.model.*;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -96,6 +99,7 @@ public class TaskEvent extends Event<Task>{
 		return t("You can view/edit this task at {base_url}/task/{id}/view",ID,payload().id());
 	}
 
+
 	@Override
 	public Translatable subject() {
 		return switch (eventType()){

core/src/main/java/de/srsoftware/umbrella/core/api/UserService.java

@@ -8,6 +8,7 @@ import de.srsoftware.umbrella.core.model.Session;
 import de.srsoftware.umbrella.core.model.Token;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
 
@@ -15,6 +16,7 @@ public interface UserService {
 	void dropSession(Token token) throws UmbrellaException;
 	Session extend(Session session) throws UmbrellaException;
 	Map<Long, UmbrellaUser> list(Integer start, Integer limit, Collection<Long> ids) throws UmbrellaException;
+	HashMap<Long,UmbrellaUser> loader();
 	Session load(Token token) throws UmbrellaException;
 	UmbrellaUser load(Session session) throws UmbrellaException;
 	Optional<UmbrellaUser> load(EmailAddress email) throws UmbrellaException;

core/src/main/java/de/srsoftware/umbrella/core/constants/Text.java

@@ -30,6 +30,7 @@ public class Text {
 
 	public static final String EMAILS_FOR_RECEIVER = "emails for {email}";
 	public static final String EVALUATION          = "evaluation";
+	public static final String EVENT_LIST          = "event list";
 
 	public static final String FILES = "files";
 

journal/src/main/java/de/srsoftware/umbrella/journal/JournalDb.java

@@ -1,8 +1,14 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.journal;
 
+import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import de.srsoftware.umbrella.messagebus.events.Event;
 
+import java.util.HashMap;
+import java.util.List;
+
 public interface JournalDb {
 	void logEvent(Event<?> event);
+
+	List<Event<?>> list(String module, long entityId, HashMap<Long, UmbrellaUser> userLoader);
 }

journal/src/main/java/de/srsoftware/umbrella/journal/JournalModule.java

@@ -2,17 +2,33 @@
 package de.srsoftware.umbrella.journal;
 
 import static de.srsoftware.umbrella.core.ConnectionProvider.connect;
+import static de.srsoftware.umbrella.core.ModuleRegistry.userService;
+import static de.srsoftware.umbrella.core.constants.Path.PARENT_CANDIDATES;
+import static de.srsoftware.umbrella.core.constants.Path.TAGGED;
+import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.invalidField;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingField;
 import static de.srsoftware.umbrella.journal.Constants.CONFIG_DATABASE;
 import static de.srsoftware.umbrella.messagebus.MessageBus.messageBus;
 import static java.lang.System.Logger.Level.DEBUG;
 
+import com.sun.net.httpserver.HttpExchange;
 import de.srsoftware.configuration.Configuration;
+import de.srsoftware.tools.Path;
+import de.srsoftware.tools.SessionToken;
 import de.srsoftware.umbrella.core.BaseHandler;
 import de.srsoftware.umbrella.core.ModuleRegistry;
+import de.srsoftware.umbrella.core.constants.Field;
+import de.srsoftware.umbrella.core.constants.Text;
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Token;
+import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import de.srsoftware.umbrella.messagebus.EventListener;
 import de.srsoftware.umbrella.messagebus.events.Event;
 
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Optional;
+
 
 public class JournalModule extends BaseHandler implements EventListener {
 
@@ -26,6 +42,28 @@ public class JournalModule extends BaseHandler implements EventListener {
 		messageBus().register(this);
 	}
 
+	@Override
+	public boolean doGet(Path path, HttpExchange ex) throws IOException {
+		addCors(ex);
+		try {
+			Optional<Token> token = SessionToken.from(ex).map(Token::of);
+			var user = userService().loadUser(token);
+			if (user.isEmpty()) return unauthorized(ex);
+			var module = path.pop();
+			if (module == null) throw missingField(Field.MODULE);
+			var head = path.pop();
+			if (head == null) throw missingField(Field.ENTITY_ID);
+			try {
+				var entityId = Long.parseLong(head);
+				journalDb.list(module, entityId, userService().loader());
+			} catch (NumberFormatException e) {
+				throw invalidField(Field.ENTITY_ID, Text.NUMBER);
+			}
+		} catch (UmbrellaException e) {
+			return send(ex, e);
+		}
+	}
+
 	@Override
 	public void onEvent(Event<?> event) {
 		LOG.log(DEBUG,"{0} @ {1} (by {2})",event.eventType(),event.module(),event.initiator().name());

journal/src/main/java/de/srsoftware/umbrella/journal/SqliteDb.java

@@ -1,20 +1,32 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.journal;
 
+import static de.srsoftware.tools.NotImplemented.notImplemented;
+import static de.srsoftware.tools.jdbc.Condition.equal;
+import static de.srsoftware.tools.jdbc.Query.SelectQuery.ALL;
 import static de.srsoftware.tools.jdbc.Query.insertInto;
+import static de.srsoftware.tools.jdbc.Query.select;
 import static de.srsoftware.umbrella.core.constants.Field.*;
-import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.databaseException;
+import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.*;
-import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.failedToCreateTable;
 import static de.srsoftware.umbrella.journal.Constants.ERROR_WRITE_EVENT;
 import static de.srsoftware.umbrella.journal.Constants.TABLE_JOURNAL;
 import static java.text.MessageFormat.format;
 
 import de.srsoftware.umbrella.core.BaseDb;
+import de.srsoftware.umbrella.core.constants.Field;
+import de.srsoftware.umbrella.core.constants.Module;
+import de.srsoftware.umbrella.core.constants.Text;
+import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import de.srsoftware.umbrella.messagebus.events.Event;
+import de.srsoftware.umbrella.messagebus.events.TaskEvent;
+
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.time.LocalDateTime;
 import java.time.ZoneOffset;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
 
 public class SqliteDb extends BaseDb implements JournalDb{
 	public SqliteDb(Connection connection) {
@@ -51,6 +63,33 @@ public class SqliteDb extends BaseDb implements JournalDb{
 		}
 	}
 
+	@Override
+	public List<Event<?>> list(String module, long entityId, HashMap<Long, UmbrellaUser> userLoader) {
+		try {
+			var rs = select(ALL).from(TABLE_JOURNAL).where(MODULE, equal(module)).where(ENTITY_ID,equal(entityId)).exec(db);
+			var list = new ArrayList<Event<?>>();
+
+
+			while (rs.next()){
+				var user   = userLoader.get(rs.getLong(USER_ID));
+				var id        = rs.getLong(Field.ID);
+				var timestamp = rs.getLong(TIMESTAMP);
+				var action    = rs.getString(ACTION);
+				var descr     = rs.getString(DESCRIPTION);
+
+				var event = switch (module){
+					case Module.TASK -> new TaskEvent(user,)
+					default -> throw notImplemented("No handler for "+module+" events!");
+				};
+				list.add(event);
+			}
+			rs.close();
+			return list;
+		} catch (SQLException e) {
+			throw failedToLoadObject(Text.EVENT_LIST);
+		};
+	}
+
 	@Override
 	public void logEvent(Event<?> event) {
 		try {

user/src/main/java/de/srsoftware/umbrella/user/UserModule.java

@@ -6,6 +6,7 @@ import static de.srsoftware.tools.Optionals.*;
 import static de.srsoftware.tools.Strings.uuid;
 import static de.srsoftware.umbrella.core.ConnectionProvider.connect;
 import static de.srsoftware.umbrella.core.ModuleRegistry.postBox;
+import static de.srsoftware.umbrella.core.ModuleRegistry.userService;
 import static de.srsoftware.umbrella.core.ResponseCode.*;
 import static de.srsoftware.umbrella.core.ResponseCode.HTTP_SERVER_ERROR;
 import static de.srsoftware.umbrella.core.Util.*;
@@ -161,6 +162,17 @@ public class UserModule extends BaseHandler implements UserService {
 		}
 	}
 
+	@Override
+	public HashMap<Long, UmbrellaUser> loader() {
+		return new HashMap<Long, UmbrellaUser>(){
+			public UmbrellaUser get(long id) {
+				var user = super.get(id);
+				if (user == null) put(id, user = loadUser(id));
+				return user;
+			}
+		};
+	}
+
 	@Override
 	public UmbrellaUser loadUser(long userId) throws UmbrellaException {
 		return users.load(userId);