backoff_algorithm.h

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/*
 * backoffAlgorithm
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
#ifndef BACKOFF_ALGORITHM_H_
#define BACKOFF_ALGORITHM_H_
 
/* Standard include. */
#include <stdint.h>
 
/* *INDENT-OFF* */
#ifdef __cplusplus
    extern "C" {
#endif
/* *INDENT-ON* */
 
#define BACKOFF_ALGORITHM_LIBRARY_VERSION    "v1.4.2"
#define BACKOFF_ALGORITHM_RETRY_FOREVER    ( UINT32_MAX )
 
typedef enum BackoffAlgorithmStatus
{
    BackoffAlgorithmSuccess = 0,     
    BackoffAlgorithmRetriesExhausted 
} BackoffAlgorithmStatus_t;
 
typedef struct BackoffAlgorithmContext
{
    uint32_t maxBackoffDelay;
 
    uint32_t attemptsDone;
 
    uint32_t nextJitterMax;
 
    uint32_t maxRetryAttempts;
} BackoffAlgorithmContext_t;
 
/* @[define_backoffalgorithm_initializeparams] */
void BackoffAlgorithm_InitializeParams( BackoffAlgorithmContext_t * pContext,
                                        uint32_t backOffBase,
                                        uint32_t maxBackOff,
                                        uint32_t maxAttempts );
/* @[define_backoffalgorithm_initializeparams] */
 
/* @[define_backoffalgorithm_getnextbackoff] */
BackoffAlgorithmStatus_t BackoffAlgorithm_GetNextBackoff( BackoffAlgorithmContext_t * pRetryContext,
                                                          uint32_t randomValue,
                                                          uint32_t * pNextBackOff );
/* @[define_backoffalgorithm_getnextbackoff] */
 
/* *INDENT-OFF* */
#ifdef __cplusplus
    }
#endif
/* *INDENT-ON* */
 
#endif /* ifndef BACKOFF_ALGORITHM_H_ */