Eblock_rd

An Erlang library that implements a block service for resource handling, implementing a Chord P2P system. Using as an underlying layer the following Erlang library: https://github.com/Robyroc/Echo_rd

Build

$ rebar3 compile

Interface

The library allows to handle the resources and the communication of a Chord node.

An example of an application using this library can be seen here: https://github.com/GiacomoZiffer/Echor_dfs, which is a distributed file system.

The full list of methods complete with a brief explanation can be seen in the gen_dfs.erl file.

Modules

• block_filter: it will handle the communication with the underlying level (application manager) and receives calls from the upper level;
• block_message_handler: it will handle the communication coming from the application manager, (used for receive_command, add_many_resources, get_local_resources, drop_many_resources);
• block_naming_hnd: it will handle all naming operations;
• block_naming_mng: it will handle the naming table when naming_handler doesn't exist or is restarting;
• block_request: it will handle the communication with the upper level, responding to the function call;
• block_resource_handler: it will handle all the operation on the resources that are stored locally;

Configuration

Eblock_rd can be configured using

$ application:set_env(eblock_rd, #VAR#, #VAL#).

The following table shows the possible configurations (in square brackets default values):

#VAR#	#VAL#	Meaning
nbits	NUMBER	Set the number of bits for the Chord network
nbits	[undefined]	Number of bits equals to 8 for the Chord network
starting_port	NUMBER ([6490])	Set the starting port from which create new nodes (useful for multiple parallel execution)
num_of_ports	NUMBER ([10])	Set the range of ports in which create new nodes (useful for multiple parallel execution)