Allow to get a forum from the ForumManager within a transaction

briar-api/src/org/briarproject/api/forum/ForumManager.java

@@ -31,6 +31,9 @@ public interface ForumManager {
 	/** Returns the forum with the given ID. */
 	Forum getForum(GroupId g) throws DbException;
 
+	/** Returns the forum with the given ID. */
+	Forum getForum(Transaction txn, GroupId g) throws DbException;
+
 	/** Returns all forums to which the user subscribes. */
 	Collection<Forum> getForums() throws DbException;
 

briar-core/src/org/briarproject/forum/ForumManagerImpl.java

@@ -141,15 +141,21 @@ class ForumManagerImpl implements ForumManager {
 
 	@Override
 	public Forum getForum(GroupId g) throws DbException {
+		Forum forum;
+		Transaction txn = db.startTransaction(true);
 		try {
-			Group group;
-			Transaction txn = db.startTransaction(true);
-			try {
-				group = db.getGroup(txn, g);
-				txn.setComplete();
-			} finally {
-				db.endTransaction(txn);
-			}
+			forum = getForum(txn, g);
+			txn.setComplete();
+		} finally {
+			db.endTransaction(txn);
+		}
+		return forum;
+	}
+
+	@Override
+	public Forum getForum(Transaction txn, GroupId g) throws DbException {
+		try {
+			Group group = db.getGroup(txn, g);
 			return parseForum(group);
 		} catch (FormatException e) {
 			throw new DbException(e);