72292 Cron Deamon w Java

Szukam osoby znającej się na programowaniu w JAVA, ktora byłaby w stanie napisać Cron Deamon:

The program periodically executes tasks specified in a configuration file, similarly to the well known Linux cron daemon. Tasks are Java classes or scripts written in some scripting language.


* Tasks (as Java classes or scripts) are defined in methods named according to the period of execution: monthly(), weekly(), daily(), hourly(), minutely(), once().

* These methods return String containing runtime messages (including errors) of the tasks.

* The messages are to be stored in a database, together with the timestamp and the task indication.

* Tasks are to be executed concurrently, in the background, using java.util.concurrent.

* When stopping the daemon, all the running tasks must also be cleanly terminated.

* Mandatory sample tasks to implement:

o Removing records older than a week from the cron database.

o Arbitrary task implemented in a scripting language.

o Finding empty files under the specified directory (including subdirectories).

The configuration file specification

Each line contains the description of a task in form of the following fields:

1. Time of starting the first execution of the task,


3. Java class name or a script file name (the filename extension determines the scripting language).


* When a task class or script does not contain the method corresponding to the period specification, the daemon issues an error message and stores it in the database.

* For Java tasks these methods must be called by reflection.

* When using other scripting languages than JavaScript, assure that appropriate libraries are available. If there is no engine for a particular language required by the configuration file, the program must issue an error message (stored in the database).


* Basic reflection for invoking task methods.

* Basic file operations for reading configuration and the mandatory task.

* Java scripting for additional task specifications.

* JDBC for storing results and messages in a database.

* Concurrency ([url removed, login to view]) for periodical execution of tasks.

Program potrzebny do czwartku. Proszę o kontakt osoby zainteresowane i przesyłanie propozycji cenowych.

Umiejętności: Android, iPad, iPhone, Mobile App Development

Zobacz więcej: reflection line, mobile specification database, line of reflection, jdbc specification, database technologies, java libraries, java jdbc, java issues, java hourly, concurrency, java reading, database program java, classes libraries, daemon scripts, java configuration, linux java script, java tasks, linux javascript engine, linux script java, task java

O pracodawcy:
( 19 ocen ) Wroclaw, Poland

Numer ID Projektu: #5645312