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core.js
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core.js
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var path = require("path"); //path.resolve(module.filename, "../../../prometheus-modules");
var ModuleManager = require("./module/module-manager.js");
var ConfigManager = require("./config/config-manager.js");
var base_chips_location = "../../base-chips";
var default_app_location = "../../example-app";
var PrometheusCore = new function(){
var mode = null;
var proper_layer_names = {"db" : true , "biz" : true , "web" : true};
//applies only to distributed mode
var which_chip_types_to_start_for_layer = {
db: ["datastore"],
biz: ["field_type", "resource_type", "service"],
web: ["field_type", "resource_type", "channel"]
}
function layer_name_valid(layer_name){
return layer_name in proper_layer_names;
}
/**
* @param {string} mode local|distributed
* @param {string} layer_name db|biz|web
*/
function decide_chip_types_to_start(mode, layer_name){
if(mode=="local"){
return ["field_type", "resource_type", "service", "channel", "datastore"];
}else if(!layer_name_valid(layer_name)){
throw new Error("Invalid layer name: " + layer_name);
}else{
return which_chip_types_to_start_for_layer[layer_name];
}
}
function getDispatcher(mode, layer_name){
if(mode=="local"){
return require("../lib/dispatchers/local/dispatcher-local.js");
}else{
return require("../lib/dispatchers/" + layer_name + "/dispatcher-" + layer_name + ".js");
}
}
/**
* [init description]
* @param {string} mode local|distributed
* @param {string} layer_name db|biz|web
*/
this.start = function(mode, layer_name, app_location){
mode = mode || "local";
layer_name = layer_name || null;
app_location = app_location || path.resolve(module.filename, default_app_location);
config_file_path = app_location + "/app.config.json";
ConfigManager.readFromFile(config_file_path); //if the argument is null then the default configuration file (config.default.json) is used
//module needed for basic Prometheus operations
base_module_dir = path.resolve(module.filename, base_chips_location );
ModuleManager.add_module(base_module_dir);
ModuleManager.add_modules(app_location + "/modules");
var chip_types_to_start = decide_chip_types_to_start(mode, layer_name);
var dispatcher = getDispatcher(mode, layer_name);
ModuleManager.initialize_all(dispatcher);
dispatcher.init();
dispatcher.start();
ModuleManager.start(chip_types_to_start);//returns a promise
};
}
module.exports = PrometheusCore;

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