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DataAccess.html
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<!DOCTYPE html>
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<article class="main-content">
<section class="section">
<div class="section-content top-matter">
<h1>DataAccess</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">DataAccess</span></code></pre>
</div>
</div>
<p>One of two prominently-used objects in Flapjack, the <code>DataAccess</code> protocol (and those that conform to it) preside over
the setup and management of the entire data persistence stack, along with managing the lifecycle of background context
operations.</p>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L19-L66">Show on GitHub</a>
</div>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP11mainContextAA0bE0_pvp"></a>
<a name="//apple_ref/swift/Property/mainContext" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP11mainContextAA0bE0_pvp">mainContext</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The main thread (or view-layer) context. Should generally only be used for read-only operations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">mainContext</span><span class="p">:</span> <span class="kt"><a href="../Protocols/DataContext.html">DataContext</a></span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L21">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP12isStackReadySbvp"></a>
<a name="//apple_ref/swift/Property/isStackReady" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP12isStackReadySbvp">isStackReady</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This should be <code>true</code> if the stack has been setup in memory and ready to go; <code>false</code> otherwise.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">isStackReady</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L23">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP8delegateAA0bC8Delegate_pSgvp"></a>
<a name="//apple_ref/swift/Property/delegate" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP8delegateAA0bC8Delegate_pSgvp">delegate</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The object that agrees to be notified about special events and requests from <code>DataAccess</code>; optional.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">delegate</span><span class="p">:</span> <span class="kt"><a href="../Protocols/DataAccessDelegate.html">DataAccessDelegate</a></span><span class="p">?</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L25">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP12prepareStack14asynchronously10completionySb_yAA0bC5ErrorOSgctF"></a>
<a name="//apple_ref/swift/Method/prepareStack(asynchronously:completion:)" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP12prepareStack14asynchronously10completionySb_yAA0bC5ErrorOSgctF">prepareStack(asynchronously:<wbr>completion:<wbr>)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Invoking this method should ask the <code>DataAccess</code> object to load up its store from disk (or in memory), ask for any
migrations needed, populate the necessary instance variables for accessing it, and set the <code><a href="../Protocols/DataAccess.html#/s:8Flapjack10DataAccessP12isStackReadySbvp">isStackReady</a></code> property
to <code>true</code> if everything succeeded.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">prepareStack</span><span class="p">(</span><span class="nv">asynchronously</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt"><a href="../Enums/DataAccessError.html">DataAccessError</a></span><span class="p">?)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>asynchronously</em>
</code>
</td>
<td>
<div>
<p>If <code>true</code>, the stack preparation should be performed in a background thread, and the
<code>completion</code> block should return on the main thread.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>completion</em>
</code>
</td>
<td>
<div>
<p>A closure to be called upon completion. If <code>asynchronously</code> is <code>true</code>, this should be
guaranteed to be called on the main thread. If <code>false</code>, it should be called on the calling
thread.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L38">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP19performInBackground9operationyyAA0B7Context_pc_tF"></a>
<a name="//apple_ref/swift/Method/performInBackground(operation:)" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP19performInBackground9operationyyAA0B7Context_pc_tF">performInBackground(operation:<wbr>)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Invoking this method should ask the <code>DataAccess</code> object to prepare a background-thread <code><a href="../Protocols/DataContext.html">DataContext</a></code> for use, and
then pop into a background thread and call the <code>operation</code>.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">performInBackground</span><span class="p">(</span><span class="nv">operation</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="n">_</span> <span class="nv">context</span><span class="p">:</span> <span class="kt"><a href="../Protocols/DataContext.html">DataContext</a></span><span class="p">)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>operation</em>
</code>
</td>
<td>
<div>
<p>The actions to execute upon the background <code><a href="../Protocols/DataContext.html">DataContext</a></code>; will be passed said context.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/DataAccess.swift#L46">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack10DataAccessP21vendBackgroundContextAA0bF0_pyF"></a>
<a name="//apple_ref/swift/Method/vendBackgroundContext()" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP21vendBackgroundContextAA0bF0_pyF">vendBackgroundContext()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Invoking this method should ask the <code>DataAccess</code> object to prepare a background-thread <code><a href="../Protocols/DataContext.html">DataContext</a></code> for use, and
then return that context right away on the calling thread. It should be the caller’s responsibility to use the
context responsibly.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">vendBackgroundContext</span><span class="p">()</span> <span class="o">-></span> <span class="kt"><a href="../Protocols/DataContext.html">DataContext</a></span></code></pre>
</div>
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<h4>Return Value</h4>
<p>A background-thread-ready <code><a href="../Protocols/DataContext.html">DataContext</a></code>.</p>
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<code>
<a name="/s:8Flapjack10DataAccessP14deleteDatabase7rebuild10completionySb_yAA0bC5ErrorOSgctF"></a>
<a name="//apple_ref/swift/Method/deleteDatabase(rebuild:completion:)" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack10DataAccessP14deleteDatabase7rebuild10completionySb_yAA0bC5ErrorOSgctF">deleteDatabase(rebuild:<wbr>completion:<wbr>)</a>
</code>
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<p>Invoking this method should ask the <code>DataAccess</code> object to delete the data store in a matter it sees fit. If asked
to <code>rebuild</code> the database, it should do so in a manner consistent with the one performed in
<code><a href="../Protocols/DataAccess.html#/s:8Flapjack10DataAccessP12prepareStack14asynchronously10completionySb_yAA0bC5ErrorOSgctF">prepareStack(asynchronously:completion:)</a></code>.</p>
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<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">deleteDatabase</span><span class="p">(</span><span class="nv">rebuild</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt"><a href="../Enums/DataAccessError.html">DataAccessError</a></span><span class="p">?)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span></code></pre>
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<h4>Parameters</h4>
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<code>
<em>rebuild</em>
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<p>If <code>true</code>, the data store should be reconstructed after it’s deleted.</p>
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<code>
<em>completion</em>
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<p>A closure to be called upon completion.</p>
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