Sistem Distribuit - function description

The aplication consists of 4 elements, node, client and proxy. There are 3 auxilary files:

• json_schema.json - this is the JSON validation schema;
• xml_schema.xml - this is the XML validation schema;
• conf.json - this is the configuration file of the aplication;
• node_data.py - this contains the data for every node;

Description of the communication protocol protocol

The communication protocol is based on JSON. The commands of the protocol are:

• get - for requesting for the data;
• respond - for sending the data that was needed;

The fields of the communication protocol differ depending on the component that sends the message:

Client

• type - type of message;
• command - the command of the message, it has only the get command;
• sort - it can be true or false;
• filter - sets the filter parameters;
• xml - it can be true or false, it specifies if the client requests for xml data;

Proxy

• type - type of message command or response;
• command - the command;
• filter - the filter parameters;
• payload - the payload;

Node

The node has the same set of parameters in the communications messages as the proxy:

• type - type of message command or response;
• command - the command;
• filter - the filter parameters;
• payload - the payload;