three.js/examples/jsm/loaders/obj2/worker/parallel/WorkerRunner.js

/**
 * Development repository: https://github.com/kaisalmen/WWOBJLoader
 */

const ObjectManipulator = function () {
};

ObjectManipulator.prototype = {

	constructor: ObjectManipulator,

	/**
	 * Applies values from parameter object via set functions or via direct assignment.
	 *
	 * @param {Object} objToAlter The objToAlter instance
	 * @param {Object} params The parameter object
	 * @param {boolean} forceCreation Force the creation of a property
	 */
	applyProperties: function ( objToAlter, params, forceCreation ) {

		// fast-fail
		if ( objToAlter === undefined || objToAlter === null || params === undefined || params === null ) return;

		let property, funcName, values;
		for ( property in params ) {

			funcName = 'set' + property.substring( 0, 1 ).toLocaleUpperCase() + property.substring( 1 );
			values = params[ property ];

			if ( typeof objToAlter[ funcName ] === 'function' ) {

				objToAlter[ funcName ]( values );

			} else if ( objToAlter.hasOwnProperty( property ) || forceCreation ) {

				objToAlter[ property ] = values;

			}

		}

	}
};

const DefaultWorkerPayloadHandler = function ( parser ) {

	this.parser = parser;
	this.logging = {
		enabled: false,
		debug: false
	};

};

DefaultWorkerPayloadHandler.prototype = {

	constructor: DefaultWorkerPayloadHandler,

	handlePayload: function ( payload ) {

		if ( payload.logging ) {

			this.logging.enabled = payload.logging.enabled === true;
			this.logging.debug = payload.logging.debug === true;

		}

		if ( payload.cmd === 'parse' ) {

			const scope = this;
			const callbacks = {
				callbackOnAssetAvailable: function ( payload ) {

					self.postMessage( payload );

				},
				callbackOnProgress: function ( text ) {

					if ( scope.logging.enabled && scope.logging.debug ) console.debug( 'WorkerRunner: progress: ' + text );

				}
			};

			const parser = this.parser;
			if ( typeof parser[ 'setLogging' ] === 'function' ) {

				parser.setLogging( this.logging.enabled, this.logging.debug );

			}

			const objectManipulator = new ObjectManipulator();
			objectManipulator.applyProperties( parser, payload.params, false );
			objectManipulator.applyProperties( parser, callbacks, false );

			const arraybuffer = payload.data.input;
			let executeFunctionName = 'execute';
			if ( typeof parser.getParseFunctionName === 'function' ) executeFunctionName = parser.getParseFunctionName();
			if ( payload.usesMeshDisassembler ) {

				// TODO: Allow to plug and use generic MeshDisassembler

			} else {

				parser[ executeFunctionName ]( arraybuffer, payload.data.options );

			}

			if ( this.logging.enabled ) console.log( 'WorkerRunner: Run complete!' );

			self.postMessage( {
				cmd: 'completeOverall',
				msg: 'WorkerRunner completed run.'
			} );

		} else {

			console.error( 'WorkerRunner: Received unknown command: ' + payload.cmd );

		}

	}
};


/**
 * Default implementation of the WorkerRunner responsible for creation and configuration of the parser within the worker.
 * @constructor
 */
const WorkerRunner = function ( payloadHandler ) {

	this.payloadHandler = payloadHandler;

	const scope = this;
	const scopedRunner = function ( event ) {

		scope.processMessage( event.data );

	};

	self.addEventListener( 'message', scopedRunner, false );

};

WorkerRunner.prototype = {

	constructor: WorkerRunner,

	/**
	 * Configures the Parser implementation according the supplied configuration object.
	 *
	 * @param {Object} payload Raw mesh description (buffers, params, materials) used to build one to many meshes.
	 */
	processMessage: function ( payload ) {

		this.payloadHandler.handlePayload( payload );

	}

};

export {
	WorkerRunner,
	DefaultWorkerPayloadHandler,
	ObjectManipulator
};