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507 lines
18 KiB
HTML
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Plausible
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v0.0.1
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</div>
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<h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L1" title="View Source" class="icon-action" rel="help">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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<span translate="no">Plausible.Cache</span> <small>behaviour</small>
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<small class="app-vsn" translate="no">(Plausible v0.0.1)</small>
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</h1>
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<section id="moduledoc">
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<p>Caching interface specific for Plausible. Usage:</p><pre><code class="makeup elixir" translate="no"><span class="kn">use</span><span class="w"> </span><span class="nc">Plausible.Cache</span><span class="w">
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</span><span class="c1"># - Implement the callbacks required</span><span class="w">
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</span><span class="c1"># - Optionally override `unwrap_cache_keys/1`</span><span class="w">
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</span><span class="c1"># - Populate the cache with `Plausible.Cache.Warmer`</span></code></pre><p>Serves as a wrapper around <a href="Plausible.Cache.Adapter.html"><code class="inline">Plausible.Cache.Adapter</code></a>, where the underlying
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implementation can be transparently swapped.</p><p>Even though normally the relevant Adapter processes are started, cache access is disabled
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during tests via the <code class="inline">:plausible, Elixir.Plausible.Cache, enabled: bool()</code> application env key.
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This can be overridden on case by case basis, using the child specs options.</p><p>The <code class="inline">base_db_query/0</code> callback is used to generate the base query that is
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executed on every cache refresh. </p><p>There are two modes of refresh operation: <code class="inline">:all</code> and <code class="inline">:updated_recently</code>;
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the former will invoke the query as is and clear all the existing entries,
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while the latter will attempt to limit the query to only the records that
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have been updated in the last 15 minutes and try to merge the new results with
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existing cache entries.</p><p>Both refresh modes are normally executed periodically from within a warmer process;
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see: <a href="Plausible.Cache.Warmer.html"><code class="inline">Plausible.Cache.Warmer</code></a>. The reason for two modes is that the latter is lighter
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on the database and can be executed more frequently.</p><p>When Cache is disabled via application env, the <code class="inline">get/1</code> function
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falls back to pure database lookups (implemented via <code class="inline">get_from_source/1</code> callback.
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This should help with introducing cached lookups in existing code,
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so that no existing tests should break.</p><p>Refreshing the cache emits telemetry event defined as per <code class="inline">telemetry_event_refresh/2</code>.</p>
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</section>
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<section id="summary" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#summary">
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<i class="ri-link-m" aria-hidden="true"></i>
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</a>
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<span class="text">Summary</span>
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</h1>
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<div class="summary-callbacks summary">
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<h2>
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<a href="#callbacks">Callbacks</a>
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</h2>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:base_db_query/0" translate="no">base_db_query()</a>
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</div>
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<div class="summary-synopsis"><p>Returns the base Ecto query used to refresh the cache</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:child_id/0" translate="no">child_id()</a>
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</div>
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<div class="summary-synopsis"><p>Supervisor child id, must be unique within the supervision tree</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:count_all/0" translate="no">count_all()</a>
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</div>
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<div class="summary-synopsis"><p>Counts all items at the source, an aggregate query most likely</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:get_from_source/1" translate="no">get_from_source(any)</a>
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</div>
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<div class="summary-synopsis"><p>Retrieves the item from the source, in case the cache is disabled</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:name/0" translate="no">name()</a>
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</div>
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<div class="summary-synopsis"><p>Unique cache name, used by underlying implementation</p></div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#c:unwrap_cache_keys/1" translate="no">unwrap_cache_keys(list)</a>
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</div>
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<div class="summary-synopsis"><p>Optionally unwraps the keys of the cache items, in case one item is stored under multiple keys</p></div>
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</div>
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</div>
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<div class="summary-functions summary">
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<h2>
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<a href="#functions">Functions</a>
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</h2>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#enabled?/0" translate="no">enabled?()</a>
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</div>
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<div class="summary-synopsis"><p>Looks for application env value at <code class="inline">:plausible, Elixir.Plausible.Cache, enabled: bool()</code></p></div>
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</div>
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</div>
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</section>
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<section id="callbacks" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#callbacks">
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<i class="ri-link-m" aria-hidden="true"></i>
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</a>
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<span class="text">Callbacks</span>
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</h1>
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<div class="callbacks-list">
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<section class="detail" id="c:base_db_query/0">
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<div class="detail-header">
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<a href="#c:base_db_query/0" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">base_db_query()</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L47" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> base_db_query() :: <a href="https://hexdocs.pm/ecto/3.11.1/Ecto.Query.html#t:t/0">Ecto.Query.t</a>()</pre>
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</div>
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<p>Returns the base Ecto query used to refresh the cache</p>
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</section>
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</section>
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<section class="detail" id="c:child_id/0">
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<div class="detail-header">
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<a href="#c:child_id/0" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">child_id()</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L41" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> child_id() :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">atom</a>()</pre>
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</div>
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<p>Supervisor child id, must be unique within the supervision tree</p>
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</section>
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</section>
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<section class="detail" id="c:count_all/0">
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<div class="detail-header">
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<a href="#c:count_all/0" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">count_all()</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L43" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> count_all() :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">integer</a>()</pre>
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</div>
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<p>Counts all items at the source, an aggregate query most likely</p>
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</section>
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</section>
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<section class="detail" id="c:get_from_source/1">
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<div class="detail-header">
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<a href="#c:get_from_source/1" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">get_from_source(any)</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L49" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> get_from_source(<a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()) :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()</pre>
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</div>
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<p>Retrieves the item from the source, in case the cache is disabled</p>
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</section>
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</section>
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<section class="detail" id="c:name/0">
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<div class="detail-header">
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<a href="#c:name/0" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">name()</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L39" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> name() :: <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">atom</a>()</pre>
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</div>
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<p>Unique cache name, used by underlying implementation</p>
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</section>
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</section>
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<section class="detail" id="c:unwrap_cache_keys/1">
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<div class="detail-header">
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<a href="#c:unwrap_cache_keys/1" class="detail-link" title="Link to this callback">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this callback</span>
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</a>
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<h1 class="signature" translate="no">unwrap_cache_keys(list)</h1>
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<a href="https://github.com/plausible/analytics/blob/main/lib/plausible/cache.ex#L45" class="icon-action" rel="help" title="View Source">
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<i class="ri-code-s-slash-line" aria-hidden="true"></i>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<div class="specs">
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<pre translate="no"><span class="attribute">@callback</span> unwrap_cache_keys([<a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()]) :: [{<a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>(), <a href="https://hexdocs.pm/elixir/typespecs.html#basic-types">any</a>()}]</pre>
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</div>
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<p>Optionally unwraps the keys of the cache items, in case one item is stored under multiple keys</p>
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</section>
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</section>
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</div>
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</section>
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<section id="functions" class="details-list">
|
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<h1 class="section-heading">
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<a class="hover-link" href="#functions">
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<i class="ri-link-m" aria-hidden="true"></i>
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</a>
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<span class="text">Functions</span>
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</h1>
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<div class="functions-list">
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<section class="detail" id="enabled?/0">
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<div class="detail-header">
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<a href="#enabled?/0" class="detail-link" title="Link to this function">
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<i class="ri-link-m" aria-hidden="true"></i>
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<span class="sr-only">Link to this function</span>
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</a>
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<h1 class="signature" translate="no">enabled?()</h1>
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<p>Looks for application env value at <code class="inline">:plausible, Elixir.Plausible.Cache, enabled: bool()</code></p>
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