Initial commit

model/chain.js

@@ -0,0 +1,119 @@
+"use strict";
+
+const Dragonfly = global.Dragonfly;
+const cl = global.botanLoader;
+const fs = require( "fs" );
+
+const conf = cl.load( "config.sx.mvc" );
+
+class Chain
+{
+	constructor( Render, Utils )
+	{
+		var _self = this;
+		this.renderer = Render;
+		this.utils = Utils;
+		this.onError = function( err )
+		{
+			if( err )
+			{
+				Dragonfly.Error( err );
+				_self.renderer( err );
+			}
+			return err;
+		}
+	}
+
+	// TemplateChainer
+	Template( _class, handler, ext )
+	{
+		var _self = this;
+		Dragonfly.Debug( "Chaining template: " + _class );
+		var _file = _class.replace( /\./g, "/" );
+
+		ext = ( ext == undefined ) ? ".html" : ext;
+
+		var defWrapper = function( err, data )
+		{
+			if( _self.onError( err ) ) return;
+			handler( _self.utils, data, _class );
+		};
+
+		fs.readFile(
+			conf.views + _file + ext
+			, "utf8"
+			, defWrapper
+		);
+	}
+
+	// General EventChainer
+	General( name, handler )
+	{
+		var _self = this;
+
+		Dragonfly.Debug( "Chaining (General): " + name );
+		var wrapper = function( err, obj )
+		{
+			if( _self.onError( err ) ) return;
+
+			handler( obj );
+		};
+
+		return wrapper;
+	}
+
+	// MultiChain
+	Multi( name, handler, l, timeout, trigger )
+	{
+		if( l == 0 )
+		{
+			Dragonfly.Info( "MultiChain " + name + ": length is zero, directly running handler" );
+			handler.apply( undefined, [] );
+			return;
+		}
+
+		var _self = this;
+
+		// Limit the timeout of callbacks to 30 secs
+		if( timeout == undefined ) timeout = 30000;
+
+		return (function()
+		{
+			var a = 0;
+			var args = [];
+			var aborted = false;
+
+			Dragonfly.Debug( "Chaining (Multi): " + name );
+
+			var abort = function()
+			{
+				if( aborted ) return;
+				aborted = true;
+				var err = new Error( "MutilChain " + name + " exceeds timeout for " + timeout + "ms" );
+				_self.onError( err );
+			};
+
+			setTimeout( abort, timeout );
+
+			return function() {
+				if( aborted ) return;
+
+				trigger && trigger.apply( undefined, arguments );
+
+				args[ args.length ] = arguments;
+
+				Dragonfly.Debug(
+					"MultiChain " + name + " " + args.length + "/" + l + " triggered"
+				);
+
+				if( args.length == l )
+				{
+					aborted = true;
+					handler.apply( undefined, args );
+				}
+			};
+		})();
+	}
+}
+
+module.exports = Chain;