@bernierllc/retry-policy

<!doctype html> <html lang="en"> <head> <title>Code coverage report for retry-policy.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <link rel="shortcut icon" type="image/x-icon" href="favicon.png" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="index.html">All files</a> retry-policy.ts</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 91.3% Statements 42/46 </div> <div class='fl pad1y space-right2'> 55% Branches 11/20 </div> <div class='fl pad1y space-right2'> 88.23% Functions 15/17 </div> <div class='fl pad1y space-right2'> 91.3% Lines 42/46 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. <template id="filterTemplate"> <div class="quiet"> Filter: <input type="search" id="fileSearch"> </div> </template> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a href='#L16'>16</a> <a name='L17'></a><a href='#L17'>17</a> <a name='L18'></a><a href='#L18'>18</a> <a name='L19'></a><a href='#L19'>19</a> <a name='L20'></a><a href='#L20'>20</a> <a name='L21'></a><a href='#L21'>21</a> <a name='L22'></a><a 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href='#L212'>212</a></td><td class="line-coverage quiet">                          1x           2x               1x               1x                     1x         18x 18x             5x 5x 5x   5x                           17x   9x 9x   3x 3x   5x 5x           17x 4x       17x             9x 9x             3x             4x   4x     4x                                   5x 2x       3x             5x             3x             1x             1x             1x       5x           1x         1x 1x           1x         2x 2x  </td><td class="text"><pre class="prettyprint lang-js">/* Copyright (c) 2025 Bernier LLC   This file is licensed to the client under a limited-use license. The client may use and modify this code *only within the scope of the project it was delivered for*. Redistribution or use in other products or commercial offerings is not permitted without written consent from Bernier LLC. */   import { RetryPolicyOptions, RetryPolicyResult, JitterConfig, BackoffConfig } from './types';   /** * Default retry policy options */ export const DEFAULT_RETRY_OPTIONS: Required<RetryPolicyOptions> = { maxRetries: 5, initialDelayMs: 1000, maxDelayMs: 30000, backoffFactor: 2, jitter: true, shouldRetry: () => true, onRetry: () => {}, onFailure: () => {} };   /** * Default jitter configuration */ export const DEFAULT_JITTER_CONFIG: JitterConfig = { type: 'full', factor: 0.1 };   /** * Default backoff configuration */ export const DEFAULT_BACKOFF_CONFIG: BackoffConfig = { type: 'exponential', baseDelay: 1000, maxDelay: 30000, factor: 2, jitter: DEFAULT_JITTER_CONFIG };   /** * Core retry policy class that provides atomic retry utilities */ export class RetryPolicy { private options: Required<RetryPolicyOptions>; private backoffConfig: BackoffConfig;   constructor(options?: Partial<RetryPolicyOptions>, backoffConfig?: Partial<BackoffConfig>) { this.options = { ...DEFAULT_RETRY_OPTIONS, ...options }; this.backoffConfig = { ...DEFAULT_BACKOFF_CONFIG, ...backoffConfig }; }   /** * Evaluate whether an operation should be retried based on current attempt and error */ evaluateRetry(attempt: number, error: any): RetryPolicyResult { const shouldRetry = this.shouldRetry(attempt, error); const delay = shouldRetry ? this.calculateDelay(attempt) : 0; const isFinalAttempt = attempt >= this.options.maxRetries;   return { shouldRetry, delay, attempt, isFinalAttempt }; }   /** * Calculate the delay for the next retry attempt */ calculateDelay(attempt: number): number { let delay: number;   switch (this.backoffConfig.type) { case 'exponential': delay = this.calculateExponentialDelay(attempt); break; case 'linear': delay = this.calculateLinearDelay(attempt); break; case 'constant': delay = this.backoffConfig.baseDelay; break; default: delay = this.calculateExponentialDelay(attempt); }   // Apply jitter if enabled if (this.options.jitter && this.backoffConfig.jitter) { delay = this.applyJitter(delay, this.backoffConfig.jitter); }   // Ensure delay doesn't exceed maximum return Math.min(delay, this.backoffConfig.maxDelay); }   /** * Calculate exponential backoff delay */ private calculateExponentialDelay(attempt: number): number { const factor = this.backoffConfig.factor || 2; return this.backoffConfig.baseDelay * Math.pow(factor, attempt); }   /** * Calculate linear backoff delay */ private calculateLinearDelay(attempt: number): number { return this.backoffConfig.baseDelay * (attempt + 1); }   /** * Apply jitter to a delay value */ private applyJitter(delay: number, jitterConfig: JitterConfig): number { const random = Math.random();   switch (jitterConfig.type) { case 'full': // Full jitter: random value between 0 and delay return delay * random; case 'equal': // Equal jitter: random value between delay/2 and delay return delay * (0.5 + random * 0.5); case 'decorrelated': // Decorrelated jitter: random value between delay and delay * 3 return delay * (1 + random * 2); case 'none': default: return delay; } }   /** * Determine if an operation should be retried based on attempt count and error */ private shouldRetry(attempt: number, error: any): boolean { // Don't retry if we've exceeded max attempts if (attempt >= this.options.maxRetries) { return false; }   // Use custom retry condition if provided return this.options.shouldRetry(error); }   /** * Get the current retry policy options */ getOptions(): Required<RetryPolicyOptions> { return { ...this.options }; }   /** * Get the current backoff configuration */ getBackoffConfig(): BackoffConfig { return { ...this.backoffConfig }; }   /** * Update retry policy options */ updateOptions(options: Partial<RetryPolicyOptions>): void { this.options = { ...this.options, ...options }; }   /** * Update backoff configuration */ updateBackoffConfig(config: Partial<BackoffConfig>): void { this.backoffConfig = { ...this.backoffConfig, ...config }; } }   /** * Factory function to create a retry policy with default options */ export function createRetryPolicy( options?: Partial<RetryPolicyOptions>, backoffConfig?: Partial<BackoffConfig> ): RetryPolicy { return new RetryPolicy(options, backoffConfig); }   /** * Utility function to calculate delay for a specific attempt */ export function calculateRetryDelay( attempt: number, options: Partial<RetryPolicyOptions> = {}, backoffConfig: Partial<BackoffConfig> = {} ): number { const policy = createRetryPolicy(options, backoffConfig); return policy.calculateDelay(attempt); }   /** * Utility function to determine if an error should trigger a retry */ export function shouldRetry( attempt: number, error: any, options: Partial<RetryPolicyOptions> = {} ): boolean { const policy = createRetryPolicy(options); return policy.evaluateRetry(attempt, error).shouldRetry; } </pre></td></tr></table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a> at 2025-07-29T00:40:49.206Z </div> <script src="prettify.js"></script> <script> window.onload = function () { prettyPrint(); }; </script> <script src="sorter.js"></script> <script src="block-navigation.js"></script> </body> </html>