Connection.md

Connection objects

Connection to the q process is wrapped by the instances of classes implementing the QConnection interface.

The qJava library provides two implementations of the QConnection interface:

• QBasicConnection - basic connector implementation,
• QCallbackConnection - in addition to QBasicConnection provides wrapped thread which enables the subscription to messages received from q.

The QBasicConnection class provides following constructors:

QBasicConnection(String host, int port, String username, String password)
QBasicConnection(String host, int port, String username, String password, String encoding)

The QCallbackConnection class provides equivalent constructors.

Managing the remote connection

Note that the connection is not established when the connector instance is created. The connection is initialized explicitly by calling the open() method.

In order to terminate the remote connection, one has to invoke the close() method.

The QConnection interface provides the reset() method which terminates current connection and opens a new one.