/**
* Calculates the connectionState resulting from the message in the current connection state.
* Checks if the specified message is allowed in the connection's state and throws an exception if
* not.
*
* @param con
* @param msg
* @return
* @throws won.protocol.exception.IllegalMessageForConnectionStateException if the message is not
* allowed in the connection's current state
*/
private ConnectionState performStateTransit(Connection con, ConnectionEventType msg)
throws IllegalMessageForConnectionStateException {
if (!msg.isMessageAllowed(con.getState())) {
throw new IllegalMessageForConnectionStateException(
con.getConnectionURI(), msg.name(), con.getState());
}
return con.getState().transit(msg);
}
public Connection getConnection(
List<Connection> connections, URI facetURI, ConnectionEventType eventType)
throws ConnectionAlreadyExistsException {
Connection con = null;
for (Connection c : connections) {
// TODO: check remote need type as well or create GroupMemberFacet
if (facetURI.equals(c.getTypeURI())) con = c;
}
/**
* check if there already exists a connection between those two we have multiple options: a) no
* connection exists -> create new b) a connection exists in state CONNECTED -> error message c)
* a connection exists in state REQUEST_SENT. The call must be a duplicate (or re-sent after the
* remote end hasn't replied for some time) -> error message d) a connection exists in state
* REQUEST_RECEIVED. The remote end tried to connect before we did. -> error message e) a
* connection exists in state CLOSED -> create new
*/
// TODO: impose unique constraint on connections
if (con != null) {
if (con.getState() == ConnectionState.CONNECTED
|| con.getState() == ConnectionState.REQUEST_SENT)
throw new ConnectionAlreadyExistsException(
con.getConnectionURI(), con.getNeedURI(), con.getRemoteNeedURI());
/*if(!eventType.isMessageAllowed(con.getState())){
throw new ConnectionAlreadyExistsException(con.getConnectionURI(), con.getNeedURI(), con.getRemoteNeedURI());
}*/ else {
// TODO: Move this to the transition() - Method in ConnectionState
con.setState(con.getState().transit(eventType));
con = connectionRepository.saveAndFlush(con);
}
}
return con;
}