retry

This is useful for functions that are "flaky", such as <code>curl</code>, which may fail for unknown
reasons that do not persist.

Collection of high-level, machine- and OS-independent tools
for making deeply reproducible and reusable content in R.
The two workhorse functions are Cache and prepInputs;
these allow for: nested caching, robust to environments, and objects with
environments (like functions); and data retrieval and processing
in continuous workflow environments. In all cases,
efforts are made to make the first and subsequent calls of functions have
the same result, but vastly faster at subsequent times by way of checksums
and digesting. Several features are still under active development, including
cloud storage of cached objects, allowing for sharing between users. Several
advanced options are available, see ?reproducibleOptions.

Eliot J B

reproducible

A Set of Tools that Enhance Reproducibility Beyond Package
Management

Eliot J B McIntire

Alex M Chubaty

Tati Micheletti

Ceres Barros

Ian Eddy

Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources Canada 

retry function

<dl><dt>expr</dt>
<dd>Quoted expression to run, i.e., <code>quote(...)</code></dd>
<dt>envir</dt>
<dd>The environment in which to evaluate the quoted expression, default
to <code>parent.frame(1)</code></dd>
<dt>retries</dt>
<dd>Numeric. The maximum number of retries.</dd>
<dt>exponentialDecayBase</dt>
<dd>Numeric &gt; 1.0. The delay between
successive retries will be <code>runif(1, min = 0, max = exponentialDecayBase ^ i - 1)</code>
where <code>i</code> is the retry number (i.e., follows <code>seq_len(retries)</code>)</dd>
<dt>silent</dt>
<dd>Logical indicating whether to <code>try</code> silently.</dd>
<dt>exprBetween</dt>
<dd>Another expression that should be run after a failed attempt
of the `expr`. This should return a named list, where the names indicate the object names
to update in the main expr, and the return value is the new value. (previous versions allowed
a non-list return, but where the final line had to be an assignment operator,
specifying what object (that is used in `expr`) will be updated prior to running
the `expr` again. For backwards compatibility, this still works).</dd>
<dt>messageFn</dt>
<dd>A function for messaging to console. Defaults to <code>message</code></dd></dl>

Arguments

A wrapper around try that retries on failure — retry

<dl>

<dt>expr</dt>
<dd>Quoted expression to run, i.e., <code>quote(...)</code></dd>


<dt>envir</dt>
<dd>The environment in which to evaluate the quoted expression, default
to <code>parent.frame(1)</code></dd>


<dt>retries</dt>
<dd>Numeric. The maximum number of retries.</dd>


<dt>exponentialDecayBase</dt>
<dd>Numeric &gt; 1.0. The delay between
successive retries will be <code>runif(1, min = 0, max = exponentialDecayBase ^ i - 1)</code>
where <code>i</code> is the retry number (i.e., follows <code>seq_len(retries)</code>)</dd>


<dt>silent</dt>
<dd>Logical indicating whether to <code>try</code> silently.</dd>


<dt>exprBetween</dt>
<dd>Another expression that should be run after a failed attempt
of the `expr`. This should return a named list, where the names indicate the object names
to update in the main expr, and the return value is the new value. (previous versions allowed
a non-list return, but where the final line had to be an assignment operator,
specifying what object (that is used in `expr`) will be updated prior to running
the `expr` again. For backwards compatibility, this still works).</dd>


<dt>messageFn</dt>
<dd>A function for messaging to console. Defaults to <code>message</code></dd>

</dl>

retry: A wrapper around `try` that retries on failure

Description

Usage

Arguments

Details