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| // Licensed to the Apache Software Foundation (ASF) under one | |
| // or more contributor license agreements. See the NOTICE file | |
| // distributed with this work for additional information | |
| // regarding copyright ownership. The ASF licenses this file | |
| // to you 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. | |
| Object.defineProperty(exports, "__esModule", { value: true }); | |
| const stream_1 = require("stream"); | |
| const stream_2 = require("../../io/stream"); | |
| /** @ignore */ | |
| function recordBatchWriterThroughNodeStream(options) { | |
| return new RecordBatchWriterDuplex(new this(options)); | |
| } | |
| exports.recordBatchWriterThroughNodeStream = recordBatchWriterThroughNodeStream; | |
| /** @ignore */ | |
| class RecordBatchWriterDuplex extends stream_1.Duplex { | |
| constructor(writer, options) { | |
| super({ allowHalfOpen: false, ...options, writableObjectMode: true, readableObjectMode: false }); | |
| this._pulling = false; | |
| this._writer = writer; | |
| this._reader = new stream_2.AsyncByteStream(writer); | |
| } | |
| _final(cb) { | |
| const writer = this._writer; | |
| writer && writer.close(); | |
| cb && cb(); | |
| } | |
| _write(x, _, cb) { | |
| const writer = this._writer; | |
| writer && writer.write(x); | |
| cb && cb(); | |
| return true; | |
| } | |
| _read(size) { | |
| const it = this._reader; | |
| if (it && !this._pulling && (this._pulling = true)) { | |
| (async () => this._pulling = await this._pull(size, it))(); | |
| } | |
| } | |
| _destroy(err, cb) { | |
| const writer = this._writer; | |
| if (writer) { | |
| err ? writer.abort(err) : writer.close(); | |
| } | |
| cb(this._reader = this._writer = null); | |
| } | |
| async _pull(size, reader) { | |
| let r = null; | |
| while (this.readable && !(r = await reader.next(size || null)).done) { | |
| if (size != null && r.value) { | |
| size -= r.value.byteLength; | |
| } | |
| if (!this.push(r.value) || size <= 0) { | |
| break; | |
| } | |
| } | |
| if ((r && r.done || !this.readable)) { | |
| this.push(null); | |
| await reader.cancel(); | |
| } | |
| return !this.readable; | |
| } | |
| } | |
| //# sourceMappingURL=writer.js.map | |