Developer Notes

ELS is written in Java version 1.8 and supporting libraries. The resulting jar is completely self-contained. ELS runs on any version 1.8 or newer of either Oracle Java or the OpenJDK.

ELS was developed using JetBrains Intellij IDEA. Eclipse users can adapt the project easily.

In the interest of readability and extensibility some portions of ELS are written-out in "long hand" code. Heavy abstration and terse "denso-code" have been avoided, while other areas are more object-oriented.

The SFTP client is implemented using Jsch : Java Secure Channel.

The SFTP server implementation utilizes Apache MINA Project technology.

The STTY implementation is entirely custom. The command set available is easily extensible. Commands are used by both automated and interactive (-r M and -r T) sessions in a request/response REST style. Interactive sessions display a built-in terminal developed in Java Swing. The Look 'n Feel of the terminal depends on the operating system. The default LnF supported by the installed Java VM is used by default. The LnF used may be changed, see the Communications How-To for details.

All remote communication is encrypted. Remote being not on the local computer where two systems are being used.

The mock directory contains pre-set publisher and subscriber collections and hint files to support testing and provide a completely self-contained development and test environment. The mock/scripts/linux/ directory has many scripts to perform application-level tests.

These scripts show many of the various ways ELS may be executed using different combinations of options. See the README in that directory for more information and a description of the testing sequence.

For IntelliJ users several run/debug configurations have been added that match the scripts in the mock/scripts/linux/ directory organized in the same way and use the same mock/ data.