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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var TransformStream = require( '@stdlib/streams/node/transform' ); // eslint-disable-line stdlib/no-redeclare
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
var createHarness = require( './harness' );
var harness = require( './get_harness.js' );
// VARIABLES //
var listeners = [];
// FUNCTIONS //
/**
* Callback invoked when a harness finishes running all benchmarks.
*
* @private
*/
function done() {
var len;
var f;
var i;
len = listeners.length;
// Inform all the listeners that the harness has finished...
for ( i = 0; i < len; i++ ) {
f = listeners.shift();
f();
}
}
/**
* Creates a results stream.
*
* @private
* @param {Options} [options] - stream options
* @throws {Error} must provide valid stream options
* @returns {TransformStream} results stream
*/
function createStream( options ) {
var stream;
var bench;
var opts;
if ( arguments.length ) {
opts = options;
} else {
opts = {};
}
// If we have already created a harness, calling this function simply creates another results stream...
if ( harness.cached ) {
bench = harness();
return bench.createStream( opts );
}
stream = new TransformStream( opts );
opts.stream = stream;
// Create a harness which uses the created output stream:
harness( opts, done );
return stream;
}
/**
* Adds a listener for when a harness finishes running all benchmarks.
*
* @private
* @param {Callback} clbk - listener
* @throws {TypeError} must provide a function
* @throws {Error} must provide a listener only once
* @returns {void}
*/
function onFinish( clbk ) {
var i;
if ( !isFunction( clbk ) ) {
throw new TypeError( format( 'invalid argument. Must provide a function. Value: `%s`.', clbk ) );
}
// Allow adding a listener only once...
for ( i = 0; i < listeners.length; i++ ) {
if ( clbk === listeners[ i ] ) {
throw new Error( 'invalid argument. Attempted to add duplicate listener.' );
}
}
listeners.push( clbk );
}
// MAIN //
/**
* Runs a benchmark.
*
* @param {string} name - benchmark name
* @param {Options} [options] - benchmark options
* @param {boolean} [options.skip=false] - boolean indicating whether to skip a benchmark
* @param {(PositiveInteger|null)} [options.iterations=null] - number of iterations
* @param {PositiveInteger} [options.repeats=3] - number of repeats
* @param {PositiveInteger} [options.timeout=300000] - number of milliseconds before a benchmark automatically fails
* @param {Function} [benchmark] - function containing benchmark code
* @throws {TypeError} first argument must be a string
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {TypeError} benchmark argument must a function
* @returns {Benchmark} benchmark harness
*
* @example
* bench( 'beep', function benchmark( b ) {
* var x;
* var i;
* b.tic();
* for ( i = 0; i < b.iterations; i++ ) {
* x = Math.sin( Math.random() );
* if ( x !== x ) {
* b.ok( false, 'should not return NaN' );
* }
* }
* b.toc();
* if ( x !== x ) {
* b.ok( false, 'should not return NaN' );
* }
* b.end();
* });
*/
function bench( name, options, benchmark ) {
var h = harness( done );
if ( arguments.length < 2 ) {
h( name );
} else if ( arguments.length === 2 ) {
h( name, options );
} else {
h( name, options, benchmark );
}
return bench;
}
/**
* Creates a benchmark harness.
*
* @name createHarness
* @memberof bench
* @type {Function}
* @param {Options} [options] - harness options
* @param {Callback} [clbk] - callback to invoke when a harness finishes running all benchmarks
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {TypeError} callback argument must be a function
* @returns {Function} benchmark harness
*/
setReadOnly( bench, 'createHarness', createHarness );
/**
* Creates a results stream.
*
* @name createStream
* @memberof bench
* @type {Function}
* @param {Options} [options] - stream options
* @throws {Error} must provide valid stream options
* @returns {TransformStream} results stream
*/
setReadOnly( bench, 'createStream', createStream );
/**
* Adds a listener for when a harness finishes running all benchmarks.
*
* @name onFinish
* @memberof bench
* @type {Function}
* @param {Callback} clbk - listener
* @throws {TypeError} must provide a function
* @throws {Error} must provide a listener only once
* @returns {void}
*/
setReadOnly( bench, 'onFinish', onFinish );
// EXPORTS //
module.exports = bench;
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