Protocol Buffers will be used for the wire protocol. As a quick test it's now used to serialize transport details when creating an invitation.

components/net/sf/briar/db/JdbcDatabase.java

@@ -1062,6 +1062,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				+ " WHERE contactSubscriptions.contactId = ?"
 				+ " AND statuses.contactId = ? AND status = ?"
 				+ " AND sendability > ZERO()";
+			// FIXME: Investigate the performance impact of "ORDER BY timestamp"
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, c.getInt());
 			ps.setInt(2, c.getInt());

components/net/sf/briar/db/ReadWriteLockDatabaseComponent.java

@@ -393,6 +393,23 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
 		}
 	}
 
+	public Map<String, String> getTransports() throws DbException {
+		transportLock.readLock().lock();
+		try {
+			Txn txn = db.startTransaction();
+			try {
+				Map<String, String> transports = db.getTransports(txn);
+				db.commitTransaction(txn);
+				return transports;
+			} catch(DbException e) {
+				db.abortTransaction(txn);
+				throw e;
+			}
+		} finally {
+			transportLock.readLock().unlock();
+		}
+	}
+
 	public Map<String, String> getTransports(ContactId c) throws DbException {
 		contactLock.readLock().lock();
 		try {

components/net/sf/briar/db/SynchronizedDatabaseComponent.java

@@ -296,6 +296,20 @@ class SynchronizedDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
 		}
 	}
 
+	public Map<String, String> getTransports() throws DbException {
+		synchronized(transportLock) {
+			Txn txn = db.startTransaction();
+			try {
+				Map<String, String> transports = db.getTransports(txn);
+				db.commitTransaction(txn);
+				return transports;
+			} catch(DbException e) {
+				db.abortTransaction(txn);
+				throw e;
+			}
+		}
+	}
+
 	public Map<String, String> getTransports(ContactId c) throws DbException {
 		synchronized(contactLock) {
 			if(!containsContact(c)) throw new NoSuchContactException();