Erlang Mesh Developer’s Manual

Introduction

Please read about mesh topology and work principals on site, in User Guide and Mesh topology and implementation details presentation. Also you should be familiar with Erlang/OTP architecture principals: applications, gen_servers, supervisor trees.

Mesh modules

mesh.erl	Internal mesh functionality: · Node Join Protocol o [join, get_role, get_roots, get_hungry_roots, update_groups_with_root] · Job Processing o [ build_job, rebuild_job, job_done] And external interface for: · Monitor o [get_root_state, get_mesh_state ] · Job Processing o [route_job_async, route_job_sync ]
node_manager.erl	Implements gen_server behavior. Implements behavior of Leaf Node Manager and Root Router. Leaf Node Manager: · Job routing to workers o [do_job, job_done] · Workers Managment o [register_worker] Root Router: · Job routing to leaves o [route_job, forward_job, job_done] · Node Join Protocol o [get_role ] · Leaves Monitoring o [handle_info]] This module implements mesh node main logic.
node_supervisor.erl	Implements supervisor behavior. init: Connects node to the mesh network. Initiate supervisor for workers and node manager, Using provided parameters.
worker.erl	Implements gen_server behavior. [do_job, do_work]: The only function. Process sleeps for time provide in Job argument, Sends to Client response with doubled value of time. Sends message to node manager that job is done.
mesh_app.erl	Implements application behavior.
global_lock.erl	Used for Node Join Protocol
mesh_mon.erl	Provides ehtml (format for html in yaws) formatted output for monitor ajax implementation on front end. mesh_state_to_ehtml
loader.erl	Used to demonstrate load on mesh.

Web Modules

index.html	GUI for all web elements. Actions panel: provides mesh functionality using AJAX Send one job Send number of jobs Send number of jobs constantly Create new node Stop node Monitor panel: provides mesh graphic representation, each 0.5 sec loads monitor_data.yaws using AJAX. Log panel: History of commands and responses.
loader_ws.yaws	Loads servers with provided number of jobs, informs the index.html page by web socket.
monitor_data.yaws	Graphic representation of mesh state Uses mesh_mon: mesh_state_to_ehtml to get representation
start_node.yaws	Starts new node using [slave] – erlang BIF.
stop_node.yaws	Stops node
worker.yaws	Sends job to the mesh and wait till it’s done.
loader.erl	Used to demonstrate load on mesh.