gcl/com/coooders/collection/arraystream.js

码农村nodejs类库，完成解决回调陷阱，配置框架，IOC框架，统一多DB访问框架，可扩展日志框架和io/db/net/thread/pool 克隆表达式，加解密算法等等一系列基础类库和算法的实现

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.ArrayStream = undefined;

var _getPrototypeOf = require('babel-runtime/core-js/object/get-prototype-of');

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

var _stream = require('stream');

var _stream2 = _interopRequireDefault(_stream);

var _util = require('util');

var _tool = require('../common/tool');

var _tool2 = _interopRequireDefault(_tool);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * 内存流提供Stream写入与读取的一切方法，但是仅仅限于写入居多的toArray方法
 */
var ArrayStream = exports.ArrayStream = function (_S$Duplex) {
    (0, _inherits3.default)(ArrayStream, _S$Duplex);

    function ArrayStream() {
        var size = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
        var buffer = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1024 * 16;
        (0, _classCallCheck3.default)(this, ArrayStream);

        var _this = (0, _possibleConstructorReturn3.default)(this, (ArrayStream.__proto__ || (0, _getPrototypeOf2.default)(ArrayStream)).call(this, { allowHalfOpen: true, readableObjectMode: true, writableObjectMode: true, highWaterMark: buffer }));

        var _ = _this;
        _.max = size;
        _.buf = [];
        _.buffersize = buffer;
        return _this;
    }

    (0, _createClass3.default)(ArrayStream, [{
        key: '_read',
        value: function _read(length) {
            var _ = this;
            if (_.buf.length) {
                // console.log('_read',length)
                _.push(Buffer.from(_.buf.splice(0, length ? length : _.buffersize)));
            } else _.push(null);
        }
    }, {
        key: '_write',
        value: function _write(chunk, encoding, callback) {
            var _ = this;
            var _buf = _.buf;
            _.buf = _buf.concat(chunk.toJSON ? chunk.toJSON().data : chunk);
            _buf = null;
            callback(_.max > 0 && _.buf.length > _.max ? new Error('limit out of size:' + _.max) : null);
        }
    }, {
        key: '_writev',
        value: function _writev(chunks, callback) {
            var _ = this;
            _tool2.default.each(chunks, function (v) {
                var _buf = _.buf;
                _.buf = _buf.concat(v.chunk.toJSON ? v.chunk.toJSON().data : v.chunk);
                _buf.splice(0, _buf.length);
                _buf = null;
                return false;
            }, true).then(function () {
                return callback(_.max > 0 && _.buf.length > _.max ? new Error('limit out of size:' + _.max) : null);
            });
        }
    }, {
        key: 'toArray',
        value: function toArray() {
            var _ = this;
            return _.buf.splice(0, _.buf.length);
        }
    }]);
    return ArrayStream;
}(_stream2.default.Duplex);
exports.default = { ArrayStream: ArrayStream };
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