@aws-amplify/core
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Core category of aws-amplify
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{"version":3,"file":"Mutex.mjs","sources":["../../../src/Mutex/Mutex.ts"],"sourcesContent":["// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.\n// SPDX-License-Identifier: Apache-2.0\n/*!\n * The MIT License (MIT)\n *\n * Copyright (c) 2016 Christian Speckner <cnspeckn@googlemail.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\nexport class Mutex {\n constructor() {\n this._queue = [];\n this._pending = false;\n }\n isLocked() {\n return this._pending;\n }\n acquire() {\n const ticket = new Promise(resolve => this._queue.push(resolve));\n if (!this._pending) {\n this._dispatchNext();\n }\n return ticket;\n }\n runExclusive(callback) {\n return this.acquire().then(release => {\n let result;\n try {\n result = callback();\n }\n catch (e) {\n release();\n throw e;\n }\n return Promise.resolve(result).then((x) => {\n release();\n return x;\n }, e => {\n release();\n throw e;\n });\n });\n }\n _dispatchNext() {\n if (this._queue.length > 0) {\n this._pending = true;\n this._queue.shift()(this._dispatchNext.bind(this));\n }\n else {\n this._pending = false;\n }\n }\n}\n"],"names":[],"mappings":"AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAM,KAAK,CAAC;AACnB,IAAI,WAAW,GAAG;AAClB,QAAQ,IAAI,CAAC,MAAM,GAAG,EAAE,CAAC;AACzB,QAAQ,IAAI,CAAC,QAAQ,GAAG,KAAK,CAAC;AAC9B,KAAK;AACL,IAAI,QAAQ,GAAG;AACf,QAAQ,OAAO,IAAI,CAAC,QAAQ,CAAC;AAC7B,KAAK;AACL,IAAI,OAAO,GAAG;AACd,QAAQ,MAAM,MAAM,GAAG,IAAI,OAAO,CAAC,OAAO,IAAI,IAAI,CAAC,MAAM,CAAC,IAAI,CAAC,OAAO,CAAC,CAAC,CAAC;AACzE,QAAQ,IAAI,CAAC,IAAI,CAAC,QAAQ,EAAE;AAC5B,YAAY,IAAI,CAAC,aAAa,EAAE,CAAC;AACjC,SAAS;AACT,QAAQ,OAAO,MAAM,CAAC;AACtB,KAAK;AACL,IAAI,YAAY,CAAC,QAAQ,EAAE;AAC3B,QAAQ,OAAO,IAAI,CAAC,OAAO,EAAE,CAAC,IAAI,CAAC,OAAO,IAAI;AAC9C,YAAY,IAAI,MAAM,CAAC;AACvB,YAAY,IAAI;AAChB,gBAAgB,MAAM,GAAG,QAAQ,EAAE,CAAC;AACpC,aAAa;AACb,YAAY,OAAO,CAAC,EAAE;AACtB,gBAAgB,OAAO,EAAE,CAAC;AAC1B,gBAAgB,MAAM,CAAC,CAAC;AACxB,aAAa;AACb,YAAY,OAAO,OAAO,CAAC,OAAO,CAAC,MAAM,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,KAAK;AACvD,gBAAgB,OAAO,EAAE,CAAC;AAC1B,gBAAgB,OAAO,CAAC,CAAC;AACzB,aAAa,EAAE,CAAC,IAAI;AACpB,gBAAgB,OAAO,EAAE,CAAC;AAC1B,gBAAgB,MAAM,CAAC,CAAC;AACxB,aAAa,CAAC,CAAC;AACf,SAAS,CAAC,CAAC;AACX,KAAK;AACL,IAAI,aAAa,GAAG;AACpB,QAAQ,IAAI,IAAI,CAAC,MAAM,CAAC,MAAM,GAAG,CAAC,EAAE;AACpC,YAAY,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC;AACjC,YAAY,IAAI,CAAC,MAAM,CAAC,KAAK,EAAE,CAAC,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;AAC/D,SAAS;AACT,aAAa;AACb,YAAY,IAAI,CAAC,QAAQ,GAAG,KAAK,CAAC;AAClC,SAAS;AACT,KAAK;AACL;;;;"}