67 lines
6.3 KiB
JavaScript
Executable file
67 lines
6.3 KiB
JavaScript
Executable file
(function (factory) {
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if (typeof module === "object" && typeof module.exports === "object") {
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var v = factory(require, exports);
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if (v !== undefined) module.exports = v;
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}
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else if (typeof define === "function" && define.amd) {
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define("@angular/compiler-cli/ngcc/src/locking/sync_locker", ["require", "exports"], factory);
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}
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})(function (require, exports) {
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.SyncLocker = void 0;
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/**
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* SyncLocker is used to prevent more than one instance of ngcc executing at the same time,
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* when being called in a synchronous context.
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*
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* * When ngcc starts executing, it creates a file in the `compiler-cli/ngcc` folder.
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* * If it finds one is already there then it fails with a suitable error message.
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* * When ngcc completes executing, it removes the file so that future ngcc executions can start.
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*/
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var SyncLocker = /** @class */ (function () {
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function SyncLocker(lockFile) {
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this.lockFile = lockFile;
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}
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/**
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* Run the given function guarded by the lock file.
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*
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* @param fn the function to run.
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* @returns the value returned from the `fn` call.
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*/
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SyncLocker.prototype.lock = function (fn) {
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this.create();
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try {
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return fn();
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}
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finally {
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this.lockFile.remove();
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}
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};
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/**
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* Write a lock file to disk, or error if there is already one there.
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*/
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SyncLocker.prototype.create = function () {
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try {
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this.lockFile.write();
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}
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catch (e) {
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if (e.code !== 'EEXIST') {
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throw e;
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}
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this.handleExistingLockFile();
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}
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};
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/**
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* The lock-file already exists so raise a helpful error.
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*/
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SyncLocker.prototype.handleExistingLockFile = function () {
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var pid = this.lockFile.read();
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throw new Error("ngcc is already running at process with id " + pid + ".\n" +
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"If you are running multiple builds in parallel then you might try pre-processing your node_modules via the command line ngcc tool before starting the builds.\n" +
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("(If you are sure no ngcc process is running then you should delete the lock-file at " + this.lockFile.path + ".)"));
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};
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return SyncLocker;
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}());
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exports.SyncLocker = SyncLocker;
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});
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