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1245 <li class=
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1247 objectTypeDefinition
1257 <li class=
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1258 <a href=
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1269 <li class=
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1281 <li class=
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1294 <a href=
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1305 <li class=
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1306 <a href=
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1317 <li class=
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1318 <a href=
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1329 <li class=
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1330 <a href=
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1377 <li class=
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1389 <li class=
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1390 <a href=
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1391 userNotificationEvent
1401 <li class=
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1402 <a href=
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1413 <li class=
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1414 <a href=
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1431 <li class=
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1432 <a href=
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1453 <li class=
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1479 <label class=
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1480 Migrating from WSC
5.3
1481 <span class=
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1483 <nav class=
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1486 Migrating from WSC
5.3
1488 <ul class=
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1494 <li class=
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1506 <li class=
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1507 <a href=
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1508 Session Handling and Authentication
1518 <li class=
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1519 <a href=
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1520 TypeScript and JavaScript
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1531 <a href=
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1542 <li class=
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1543 <a href=
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1544 Third Party Libraries
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1564 <input class=
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1566 <label class=
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1567 Migrating from WSC
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1568 <span class=
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1570 <nav class=
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"2">
1571 <label class=
"md-nav__title" for=
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1572 <span class=
"md-nav__icon md-icon"></span>
1573 Migrating from WSC
5.2
1575 <ul class=
"md-nav__list" data-md-scrollfix
>
1581 <li class=
"md-nav__item">
1582 <a href=
"../../../migration/wsc52/php/" class=
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1593 <li class=
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1594 <a href=
"../../../migration/wsc52/templates/" class=
"md-nav__link">
1595 Templates and Languages
1605 <li class=
"md-nav__item">
1606 <a href=
"../../../migration/wsc52/libraries/" class=
"md-nav__link">
1607 Third Party Libraries
1624 <li class=
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1627 <input class=
"md-nav__toggle md-toggle" data-md-toggle=
"__nav_6_3" type=
"checkbox" id=
"__nav_6_3" >
1629 <label class=
"md-nav__link" for=
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1630 Migrating from WSC
3.1
1631 <span class=
"md-nav__icon md-icon"></span>
1633 <nav class=
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"Migrating from WSC 3.1" data-md-level=
"2">
1634 <label class=
"md-nav__title" for=
"__nav_6_3">
1635 <span class=
"md-nav__icon md-icon"></span>
1636 Migrating from WSC
3.1
1638 <ul class=
"md-nav__list" data-md-scrollfix
>
1644 <li class=
"md-nav__item">
1645 <a href=
"../../../migration/wsc31/php/" class=
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1663 <li class=
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"__nav_6_4" type=
"checkbox" id=
"__nav_6_4" >
1668 <label class=
"md-nav__link" for=
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1669 Migrating from WSC
3.0
1670 <span class=
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1672 <nav class=
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"Migrating from WSC 3.0" data-md-level=
"2">
1673 <label class=
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1674 <span class=
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1675 Migrating from WSC
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1677 <ul class=
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1683 <li class=
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1720 <a href=
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1731 <li class=
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1732 <a href=
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1750 <li class=
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1755 <label class=
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1756 Migrating from WCF
2.1
1757 <span class=
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1759 <nav class=
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1760 <label class=
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1761 <span class=
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1762 Migrating from WCF
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1764 <ul class=
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1770 <li class=
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1771 <a href=
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1841 <span class=
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1939 <div class=
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1941 <div class=
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1943 <nav class=
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1949 <label class=
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1950 <span class=
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1953 <ul class=
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1955 <li class=
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1956 <a href=
"#abstractcachebuilder" class=
"md-nav__link">
1957 AbstractCacheBuilder
1960 <nav class=
"md-nav" aria-label=
"AbstractCacheBuilder">
1961 <ul class=
"md-nav__list">
1963 <li class=
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1964 <a href=
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"md-nav__link">
1965 getData(array $parameters = [], string $arrayIndex = ''): array
1970 <li class=
"md-nav__item">
1971 <a href=
"#getmaxlifetime-int" class=
"md-nav__link">
1972 getMaxLifetime(): int
1977 <li class=
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1978 <a href=
"#resetarray-parameters-void" class=
"md-nav__link">
1979 reset(array $parameters = []): void
1984 <li class=
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1985 <a href=
"#rebuildarray-parameters-array" class=
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1986 rebuild(array $parameters): array
2004 <div class=
"md-content" data-md-component=
"content">
2005 <article class=
"md-content__inner md-typeset">
2008 <a href=
"https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/php/api/caches_persistent-caches.md" title=
"Edit this page" class=
"md-content__button md-icon">
2009 <svg xmlns=
"http://www.w3.org/2000/svg" viewBox=
"0 0 24 24"><path d=
"M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
2013 <h1 id=
"persistent-caches">Persistent Caches
<a class=
"headerlink" href=
"#persistent-caches" title=
"Permanent link">#
</a></h1>
2014 <p>Relational databases are designed around the principle of normalized data that
2015 is organized across clearly separated tables with defined releations between
2016 data rows. While this enables you to quickly access and modify individual rows
2017 and columns, it can create the problem that re-assembling this data into a more
2018 complex structure can be quite expensive.
</p>
2019 <p>For example, the user group permissions are stored for each user group and each
2020 permissions separately, but in order to be applied, they need to be fetched and
2021 the cumulative values across all user groups of an user have to be calculated.
2022 These repetitive tasks on barely ever changing data make them an excellent
2023 target for caching, where all sub-sequent requests are accelerated because they
2024 no longer have to perform the same expensive calculations every time.
</p>
2025 <p>It is easy to get lost in the realm of caching, especially when it comes to the
2026 decision if you should use a cache or not. When in doubt, you should opt to not
2027 use them, because they also come at a hidden cost that cannot be expressed through
2028 simple SQL query counts. If you haven't already, it is recommended that you read
2029 the
<a href=
"../caches/">introduction article on caching
</a> first, it provides a bit
2030 of background on caches and examples that should help you in your decision.
</p>
2031 <h2 id=
"abstractcachebuilder"><code>AbstractCacheBuilder
</code><a class=
"headerlink" href=
"#abstractcachebuilder" title=
"Permanent link">#
</a></h2>
2032 <p>Every cache builder should derive from the base class
<a href=
"https://github.com/WoltLab/WCF/blob/master/wcfsetup/install/files/lib/system/cache/builder/AbstractCacheBuilder.class.php">AbstractCacheBuilder
</a>
2033 that already implements the mandatory interface
<a href=
"https://github.com/WoltLab/WCF/blob/master/wcfsetup/install/files/lib/system/cache/builder/ICacheBuilder.class.php">ICacheBuilder
</a>.
</p>
2034 <div class=
"highlight"><pre><span></span><code><span class=
"o"><?
</span><span class=
"nx">php
</span>
2035 <span class=
"k">namespace
</span> <span class=
"nx">wcf\system\cache\builder
</span><span class=
"p">;
</span>
2037 <span class=
"k">class
</span> <span class=
"nc">ExampleCacheBuilder
</span> <span class=
"k">extends
</span> <span class=
"nx">AbstractCacheBuilder
</span> <span class=
"p">{
</span>
2038 <span class=
"c1">//
3600 =
1hr
</span>
2039 <span class=
"k">protected
</span> <span class=
"nv">$maxLifetime
</span> <span class=
"o">=
</span> <span class=
"mi">3600</span><span class=
"p">;
</span>
2041 <span class=
"k">public
</span> <span class=
"k">function
</span> <span class=
"nf">rebuild
</span><span class=
"p">(
</span><span class=
"k">array
</span> <span class=
"nv">$parameters
</span><span class=
"p">)
</span> <span class=
"p">{
</span>
2042 <span class=
"nv">$data
</span> <span class=
"o">=
</span> <span class=
"p">[];
</span>
2044 <span class=
"c1">// fetch and process your data and assign it to `$data`
</span>
2046 <span class=
"k">return
</span> <span class=
"nv">$data
</span><span class=
"p">;
</span>
2047 <span class=
"p">}
</span>
2048 <span class=
"p">}
</span>
2050 <p>Reading data from your cache builder is quite simple and follows a consistent
2051 pattern. The callee only needs to know the name of the cache builder, which
2052 parameters it requires and how the returned data looks like. It does not need
2053 to know how the data is retrieve, where it was stored, nor if it had to be
2054 rebuild due to the maximum lifetime.
</p>
2055 <div class=
"highlight"><pre><span></span><code><span class=
"o"><?
</span><span class=
"nx">php
</span>
2056 <span class=
"k">use
</span> <span class=
"nx">wcf\system\cache\builder\ExampleCacheBuilder
</span><span class=
"p">;
</span>
2058 <span class=
"nv">$data
</span> <span class=
"o">=
</span> <span class=
"nx">ExampleCacheBuilder
</span><span class=
"o">::
</span><span class=
"na">getInstance
</span><span class=
"p">()
</span><span class=
"o">-
></span><span class=
"na">getData
</span><span class=
"p">(
</span><span class=
"nv">$parameters
</span><span class=
"p">);
</span>
2060 <h3 id=
"getdataarray-parameters-string-arrayindex-array"><code>getData(array $parameters = [], string $arrayIndex = ''): array
</code><a class=
"headerlink" href=
"#getdataarray-parameters-string-arrayindex-array" title=
"Permanent link">#
</a></h3>
2061 <p>Retrieves the data from the cache builder, the
<code>$parameters
</code> array is automatically
2062 sorted to allow sub-sequent requests for the same parameters to be recognized,
2063 even if their parameters are mixed. For example,
<code>getData([
1,
2])
</code> and
<code>getData([
2,
1])
</code>
2064 will have the same exact result.
</p>
2065 <p>The optional
<code>$arrayIndex
</code> will instruct the cache builder to retrieve the data
2066 and examine if the returned data is an array that has the index
<code>$arrayIndex
</code>.
2067 If it is set, the potion below this index is returned instead.
</p>
2068 <h3 id=
"getmaxlifetime-int"><code>getMaxLifetime(): int
</code><a class=
"headerlink" href=
"#getmaxlifetime-int" title=
"Permanent link">#
</a></h3>
2069 <p>Returns the maximum lifetime of a cache in seconds. It can be controlled through
2070 the
<code>protected $maxLifetime
</code> property which defaults to
<code>0</code>. Any cache that has
2071 a lifetime greater than
0 is automatically discarded when exceeding this age,
2072 otherwise it will remain forever until it is explicitly removed or invalidated.
</p>
2073 <h3 id=
"resetarray-parameters-void"><code>reset(array $parameters = []): void
</code><a class=
"headerlink" href=
"#resetarray-parameters-void" title=
"Permanent link">#
</a></h3>
2074 <p>Invalidates a cache, the
<code>$parameters
</code> array will again be ordered using the same
2075 rules that are applied for
<code>getData()
</code>.
</p>
2076 <h3 id=
"rebuildarray-parameters-array"><code>rebuild(array $parameters): array
</code><a class=
"headerlink" href=
"#rebuildarray-parameters-array" title=
"Permanent link">#
</a></h3>
2077 <p><em>This method is protected.
</em></p>
2078 <p>This is the only method that a cache builder deriving from
<code>AbstractCacheBuilder
</code>
2079 has to implement and it will be invoked whenever the cache is required to be
2080 rebuild for whatever reason.
</p>
2086 <div class=
"md-source-date">
2089 Last update:
2021-
01-
08
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