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<h1>exponential.js</h1>
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<pre><code> Copyright (c) <span class="hljs-number">2012</span> Mathieu Turcotte
Licensed under the MIT license.
</code></pre>
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<div class="content"><div class='highlight'><pre>
<span class="hljs-keyword">var</span> util = <span class="hljs-built_in">require</span>(<span class="hljs-string">'util'</span>);
<span class="hljs-keyword">var</span> precond = <span class="hljs-built_in">require</span>(<span class="hljs-string">'precond'</span>);
<span class="hljs-keyword">var</span> BackoffStrategy = <span class="hljs-built_in">require</span>(<span class="hljs-string">'./strategy'</span>);</pre></div></div>
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<p>Exponential backoff strategy.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ExponentialBackoffStrategy</span><span class="hljs-params">(options)</span> {</span>
BackoffStrategy.call(<span class="hljs-keyword">this</span>, options);
<span class="hljs-keyword">this</span>.backoffDelay_ = <span class="hljs-number">0</span>;
<span class="hljs-keyword">this</span>.nextBackoffDelay_ = <span class="hljs-keyword">this</span>.getInitialDelay();
<span class="hljs-keyword">this</span>.factor_ = ExponentialBackoffStrategy.DEFAULT_FACTOR;
<span class="hljs-keyword">if</span> (options && options.factor !== <span class="hljs-literal">undefined</span>) {
precond.checkArgument(options.factor > <span class="hljs-number">1</span>,
<span class="hljs-string">'Exponential factor should be greater than 1 but got %s.'</span>,
options.factor);
<span class="hljs-keyword">this</span>.factor_ = options.factor;
}
}
util.inherits(ExponentialBackoffStrategy, BackoffStrategy);</pre></div></div>
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<p>Default multiplication factor used to compute the next backoff delay from
the current one. The value can be overridden by passing a custom factor as
part of the options.</p>
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<div class="content"><div class='highlight'><pre>ExponentialBackoffStrategy.DEFAULT_FACTOR = <span class="hljs-number">2</span>;
ExponentialBackoffStrategy.prototype.next_ = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">this</span>.backoffDelay_ = <span class="hljs-built_in">Math</span>.min(<span class="hljs-keyword">this</span>.nextBackoffDelay_, <span class="hljs-keyword">this</span>.getMaxDelay());
<span class="hljs-keyword">this</span>.nextBackoffDelay_ = <span class="hljs-keyword">this</span>.backoffDelay_ * <span class="hljs-keyword">this</span>.factor_;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.backoffDelay_;
};
ExponentialBackoffStrategy.prototype.reset_ = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">this</span>.backoffDelay_ = <span class="hljs-number">0</span>;
<span class="hljs-keyword">this</span>.nextBackoffDelay_ = <span class="hljs-keyword">this</span>.getInitialDelay();
};
module.exports = ExponentialBackoffStrategy;</pre></div></div>
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