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https://github.com/silverstripe/silverstripe-framework
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Rewrite and tidy up of performance section
This commit is contained in:
Will Rossiter
Cam Findlay
parent
549531798f
commit
f4dad25af0
@ -1,64 +1,49 @@
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title: Partial Caching
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summary: Cache SilverStripe templates to reduce database queries.
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# Partial Caching
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## Introduction
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Partial caching is a feature that allows the caching of just a portion of a page.
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As opposed to static publishing, which avoids the SilverStripe controller layer on cached pages, partial caching allows
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caching for pages that contain a mix of moderately static & user specific data, and still provide full access control
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and permission enforcement.
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The trade-off is that it does not provide as much performance improvement as static publishing, although for data heavy
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pages the speed increases can be significant.
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## Basics
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The way you mark a section of the template as being cached is to wrap that section in a cached tag, like so:
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Partial caching is a feature that allows the caching of just a portion of a page.
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:::ss
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<% cached %>
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<% cached 'CacheKey' %>
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$DataTable
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...
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<% end_cached %>
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Each cache block has a cache key - an unlimited number of comma separated variables (in the same form as `if` and
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`loop`/`with` tag variables) and quoted strings.
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Every time the cache key returns a different result, the contents of the block are recalculated. If the cache key is the
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same as a previous render, the cached value stored last time is used.
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Each cache block has a cache key. A cache key is an unlimited number of comma separated variables and quoted strings.
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Every time the cache key returns a different result, the contents of the block are recalculated. If the cache key is
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the same as a previous render, the cached value stored last time is used.
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Since the above example contains just one argument as the cache key, a string (which will be the same every render) it
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will invalidate the cache after the TTL has expired (default 10 minutes)
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will invalidate the cache after a given amount of time has expired (default 10 minutes).
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Here are some more complex examples:
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From a block that updates every time the Page subclass it's the template for updates
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:::ss
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<% cached 'database', LastEdited %>
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From a block that shows a login block if not logged in, or a homepage link if logged in, depending on the current member
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:::ss
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<% cached 'database', LastEdited %>
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<!-- that updates every time the record changes. -->
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<% end_cached %>
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<% cached 'loginblock', CurrentMember.ID %>
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<!-- cached unique to the user. i.e for user 2, they will see a different cache to user 1 -->
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<% end_cached %>
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From a block that shows a summary of the page edits if administrator, nothing if not
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:::ss
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<% cached 'loginblock', LastEdited, CurrentMember.isAdmin %>
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<!-- recached when block object changes, and if the user is admin -->
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<% end_cached %>
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An additional global key is incorporated in the cache lookup. The default value for this is
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`$CurrentReadingMode, $CurrentUser.ID`, which ensures that the current `[api:Versioned]` state and user ID are
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used. This may be configured by changing the config value of `SSViewer.global_key`. It is also necessary
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to flush the template caching when modifying this config, as this key is cached within the template itself.
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An additional global key is incorporated in the cache lookup. The default value for this is
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`$CurrentReadingMode, $CurrentUser.ID`. This ensures that the current `[api:Versioned]` state and user ID are used.
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This may be configured by changing the config value of `SSViewer.global_key`. It is also necessary to flush the
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template caching when modifying this config, as this key is cached within the template itself.
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For example, to ensure that the cache is configured to respect another variable, and if the current logged in
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user does not influence your template content, you can update this key as below;
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**mysite/_config/app.yml**
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:::yaml
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SSViewer:
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global_key: '$CurrentReadingMode, $Locale'
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@ -66,39 +51,45 @@ user does not influence your template content, you can update this key as below;
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## Aggregates
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Often you want to invalidate a cache when any in a set of objects change, or when the objects in a relationship change.
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To help do this, SilverStripe introduces the concept of Aggregates. These calculate and return SQL aggregates
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on sets of `[api:DataObject]`s - the most useful for us being the Max aggregate.
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Often you want to invalidate a cache when any object in a set of objects change, or when the objects in a relationship
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change. To do this, SilverStripe introduces the concept of Aggregates. These calculate and return SQL aggregates
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on sets of [api:DataObject]s - the most useful for us being the `Max` aggregate.
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For example, if we have a menu, we want that menu to update whenever _any_ page is edited, but would like to cache it
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otherwise. By using aggregates, we can do that like this:
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otherwise. By using aggregates, we do that like this:
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:::ss
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<% cached 'navigation', List(SiteTree).max(LastEdited), List(SiteTree).count() %>
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If we have a block that shows a list of categories, we can make sure the cache updates every time a category is added or
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edited
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The cache for this will update whenever a page is added, removed or edited.
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If we have a block that shows a list of categories, we can make sure the cache updates every time a category is added
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or edited
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:::ss
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<% cached 'categorylist', List(Category).max(LastEdited), List(Category).count() %>
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Note the use of both .max(LastEdited) and .count() - this takes care of both the case where an object has been edited
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since the cache was last built, and also when an object has been deleted/un-linked since the cache was last built.
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<div class="notice" markdown="1">
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Note the use of both `.max(LastEdited)` and `.count()` - this takes care of both the case where an object has been
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edited since the cache was last built, and also when an object has been deleted since the cache was last built.
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</div>
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We can also calculate aggregates on relationships. A block that shows the current member's favourites needs to update
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whenever the relationship Member::$has_many = array('Favourites' => Favourite') changes.
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We can also calculate aggregates on relationships. A block that shows the current member's favorites needs to update
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whenever the relationship `Member::$has_many = array('Favourites' => Favourite')` changes.
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:::ss
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<% cached 'favourites', CurrentMember.ID, CurrentMember.Favourites.max(LastEdited) %>
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## Cache key calculated in controller
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That last example is a bit large, and is complicating our template up with icky logic. Better would be to extract that
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logic into the controller
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In the previous example the cache key is getting a bit large, and is complicating our template up. Better would be to
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extract that logic into the controller.
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:::php
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public function FavouriteCacheKey() {
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$member = Member::currentUser();
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return implode('_', array(
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'favourites',
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$member->ID,
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@ -106,8 +97,7 @@ logic into the controller
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));
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}
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and then using that function in the cache key
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Then using that function in the cache key:
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:::ss
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<% cached FavouriteCacheKey %>
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@ -159,29 +149,28 @@ heavy load:
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<% cached 'blogstatistics', Blog.ID if HighLoad %>
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By adding a HighLoad function to your page controller, you could enable or disable caching dynamically.
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By adding a `HighLoad` function to your `Page_Controller`, you could enable or disable caching dynamically.
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To cache the contents of a page for all anonymous users, but dynamically calculate the contents for logged in members,
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you could use something like:
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use something like:
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:::ss
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<% cached unless CurrentUser %>
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## Uncached
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As a shortcut, the template tag 'uncached' can be used - it is the exact equivilent of a cached block with an if
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condition that always returns false. The key and conditionals in an uncached tag are ignored, so you can easily
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temporarily disable a particular cache block by changing just the tag, leaving the key and conditional intact.
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Yhe template tag 'uncached' can be used - it is the exact equivalent of a cached block with an if condition that always
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returns false. The key and conditionals in an uncached tag are ignored, so you can easily temporarily disable a
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particular cache block by changing just the tag, leaving the key and conditional intact.
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:::ss
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<% uncached %>
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## Nested cacheblocks
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## Nested cache blocks
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You can also nest independent cache blocks (with one important rule, discussed later).
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Any nested cache blocks are calculated independently from their containing block, regardless of the cached state of that
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container.
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You can also nest independent cache blocks Any nested cache blocks are calculated independently from their containing
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block, regardless of the cached state of that container.
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This allows you to wrap an entire page in a cache block on the page's LastEdited value, but still keep a member-specific
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portion dynamic, without having to include any member info in the page's cache key.
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@ -217,11 +206,10 @@ could also write the last example as:
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$ASlowCalculation
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<% end_cached %>
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## The important rule
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<div class="warning" markdown="1">
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Currently cached blocks can not be contained within if or loop blocks. The template engine will throw an error
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letting you know if you've done this. You can often get around this using aggregates.
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</div>
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Failing example:
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@ -236,8 +224,6 @@ Failing example:
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<% end_cached %>
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Can be re-written as:
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:::ss
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@ -249,4 +235,4 @@ Can be re-written as:
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<% end_loop %>
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<% end_cached %>
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<% end_cached %>
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<% end_cached %>
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@ -1,25 +0,0 @@
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# Cache control
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By default, PHP add caching headers that make the page appear "purely dynamic".
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This isn't usually appropriate for most sites, even ones that are updated reasonably frequently.
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In particular, the default PHP cache-control settings prevent sites from appearing in the internet archive.
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SilverStripe overrides the default settings with the following:
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Default setting:
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* The `Last-Modified` date is set to be most recent modification date of any database record queried in the generation of the page.
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* The `Expiry` date is set by taking the age of the page and adding that to the current time.
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* `Cache-Control` is set to `max-age=86400, must-revalidate`
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* Since a visitor cookie is set, the site won't be cached by proxies
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* Ajax requests are never cached.
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Overriding these defaults
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* `[api:HTTP::$cache_age]` can be used to set the max-age component of the cache-control line, in seconds.
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Set it to 0 to disable caching; the "no-cache" clause in `Cache-Control` and `Pragma` will be included. It works only for live sites, if `SS_ENVIRONMENT_TYPE` is set to "dev" `[api:HTTP::$cache_age]` will be always overridden with 0.
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* `[api:HTTP::register_modification_date()]` can be used to set the modification date to something more recent than the default.
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How it works:
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* `[api:DataObject::__construct()]` calls `[api:HTTP::register_modification_date()]` whenever a record comes from the database
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* `Controller::run()` calls `[api:HTTP::add_cache_headers()]` before outputting the page
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@ -0,0 +1,33 @@
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title: HTTP Cache Headers
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summary: Set the correct HTTP cache headers for your responses.
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# Caching Headers
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By default, PHP adds caching headers that make the page appear purely dynamic. This isn't usually appropriate for most
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sites, even ones that are updated reasonably frequently. SilverStripe overrides the default settings with the following
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headers:
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* The `Last-Modified` date is set to be most recent modification date of any database record queried in the generation
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of the page.
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* The `Expiry` date is set by taking the age of the page and adding that to the current time.
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* `Cache-Control` is set to `max-age=86400, must-revalidate`
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* Since a visitor cookie is set, the site won't be cached by proxies.
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* Ajax requests are never cached.
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## Customizing Cache Headers
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### HTTP::set_cache_age
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:::php
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HTTP::set_cache_age(0);
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Used to set the max-age component of the cache-control line, in seconds. Set it to 0 to disable caching; the "no-cache"
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clause in `Cache-Control` and `Pragma` will be included.
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### HTTP::register_modification_date
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:::php
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HTTP::register_modification_date('2014-10-10');
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Used to set the modification date to something more recent than the default. [api:DataObject::__construct] calls
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[api:HTTP::register_modification_date(] whenever a record comes from the database ensuring the newest date is present.
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13
docs/en/02_Developer_Guides/08_Performance/03_Profiling.md
Normal file
13
docs/en/02_Developer_Guides/08_Performance/03_Profiling.md
Normal file
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title: Profiling
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summary: Identify bottlenecks within your application.
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# Profiling
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Profiling is the best way to identify bottle necks and other slow moving parts of your application prime for
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optimization.
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SilverStripe does not include any profiling tools out of the box, but we recommend the use of existing tools such as
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[XHProf](https://github.com/facebook/xhprof/) and [XDebug](http://xdebug.org/).
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* [Profiling with XHProf](http://techportal.inviqa.com/2009/12/01/profiling-with-xhprof/)
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* [Profiling PHP Applications With xdebug](http://devzone.zend.com/1139/profiling-php-applications-with-xdebug/)
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@ -0,0 +1,20 @@
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title: Static Publishing
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summary: Export your web pages as static HTML and serve the web like it's 1999.
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# Static Publishing
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One of the best ways to get the top performance out of SilverStripe is to bypass it completely. This saves on any loading
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time, connecting to the database and formatting your templates. This is only appropriate approach on web pages that
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have completely static content.
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<div class="info" markdown="1">
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If you want to cache part of a page, or your site has interactive elements such as forms, then
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[Partial Caching](partial_caching) is more suitable.
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</div>
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By publishing the page as HTML it's possible to run SilverStripe from behind a corporate firewall, on a low performance
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server or serve millions of hits an hour without expensive hardware.
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This functionality is available through the [StaticPublisher](https://github.com/silverstripe-labs/silverstripe-staticpublisher)
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module. The module provides hooks for developers to generate static HTML files for the whole application or publish key
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pages (e.g a web applications home page) as HTML to reduce load on the server.
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@ -1,8 +0,0 @@
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#### Profiling
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Profiling is the best way to identify bottle necks and other slow moving parts of your application prime for optimization. SilverStripe
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does not include any profiling tools out of the box, but we recommend the use of existing tools such as [XHProf](https://github.com/facebook/xhprof/)
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and [XDebug](http://xdebug.org/).
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* [Profiling with XHProf](http://techportal.inviqa.com/2009/12/01/profiling-with-xhprof/)
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* [Profiling PHP Applications With xdebug](http://devzone.zend.com/1139/profiling-php-applications-with-xdebug/)
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@ -1,8 +1,14 @@
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title: Performance
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summary: Make your applications faster by learning how to write more scalable code and ways to cache your important information.
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introduction: Make your applications faster by learning how to write more scalable code and ways to cache your important information.
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[CHILDREN]
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The following guide describes the common ways to speed your SilverStripe website up. The general rules for getting
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the best performance out of SilverStripe include running the latest versions of PHP alongside a
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[opcode](http://en.wikipedia.org/wiki/Opcode) cache such as [XCache](http://xcache.lighttpd.net/) or
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[APC](http://nz2.php.net/manual/en/intro.apc.php).
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## How-to
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If you're running shared hosting, make sure your host meets the minimum system requirements and has activated one of the
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PHP opcode caches to achieve the best results for your application. Once your hardware is performing it's best, dig
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into the guides below to see what you can do.
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[CHILDREN How_To]
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[CHILDREN Exclude=How_Tos]
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@ -1,13 +1,13 @@
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title: Command Line Interface
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summary: Automate SilverStripe, run Cron Jobs or sync with other platforms through the Command Line Interface.
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introduction: Automate SilverStripe, run Cron Jobs or sync with other platforms through the Command Line Interface.
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# Command Line
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SilverStripe can call [Controllers](../controllers) through a command line interface (CLI) just as easily as through a
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web browser. This functionality can be used to automate tasks with cron jobs, run unit tests, or anything else that
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needs to interface over the command line.
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SilverStripe can call [controllers](../controllers) through a command line interface (CLI) just as easily as through a
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web browser. This can be used to automate tasks with cron jobs, run unit tests, or anything else that needs to interface
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over the command line.
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The main entry point for any command line execution is `cli-script.php`. For example, to run a database rebuild
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from the command line, use this command:
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The main entry point for any command line execution is `framework/cli-script.php`. For example, to run a database
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rebuild from the command line, use this command:
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:::bash
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cd your-webroot/
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@ -19,76 +19,86 @@ more). This can be a good thing, your CLI can be configured to use higher memory
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to have.
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</div>
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## Sake: SilverStripe Make
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## Sake - SilverStripe Make
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Sake is a simple wrapper around `cli-script.php`. It also tries to detect which `php` executable to use if more than one
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are available.
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<div class="info" markdown='1'>
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If you are using a debian server: Check you have the php-cli package installed for sake to work. If you get an error
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If you are using a Debian server: Check you have the php-cli package installed for sake to work. If you get an error
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when running the command php -v, then you may not have php-cli installed so sake won't work.
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</div>
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### Installation
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You can copy the `sake` file into `/usr/bin/sake` for easier access (this is optional):
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`sake` can be invoked using `./framework/sake`. For easier access, copy the `sake` file into `/usr/bin/sake`.
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cd your-webroot/
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sudo ./framework/sake installsake
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<div class="warning">
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This currently only works on UNIX-like systems, not on Windows.
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This currently only works on UNIX like systems, not on Windows.
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</div>
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### Configuration
|
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Sometimes SilverStripe needs to know the URL of your site, for example, when sending an email or generating static
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files. When you're visiting your site in a web browser this is easy to work out, but if you're executing scripts on the
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command line, it has no way of knowing.
|
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To work this out, you should add lines of this form to your [_ss_environment.php](/getting_started/environment_management)
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file.
|
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Sometimes SilverStripe needs to know the URL of your site. For example, when sending an email or generating static
|
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files. When you're visiting the site in a web browser this is easy to work out, but when executing scripts on the
|
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command line, it has no way of knowing. To work this out, add lines to your
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[_ss_environment.php](/getting_started/environment_management) file.
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:::php
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global $_FILE_TO_URL_MAPPING;
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$_FILE_TO_URL_MAPPING['/Users/sminnee/Sites'] = 'http://localhost';
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The above statement tells SilverStripe that anything executed under the `/Users/sminnee/Sites` directly will have the
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base URL `http://localhost`.
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The above statement tells SilverStripe that anything executed under the `/Users/sminnee/Sites` directory will have the
|
||||
base URL `http://localhost`. The site `/Users/sminnee/Sites/my_silverstripe_project` will translate to the URL
|
||||
`http://localhost/my_silverstripe_project`.
|
||||
|
||||
You can add multiple file to url mapping definitions. The most specific mapping will be used. For example:
|
||||
You can add multiple file to url mapping definitions. The most specific mapping will be used.
|
||||
|
||||
:::php
|
||||
global $_FILE_TO_URL_MAPPING;
|
||||
|
||||
$_FILE_TO_URL_MAPPING['/Users/sminnee/Sites'] = 'http://localhost';
|
||||
$_FILE_TO_URL_MAPPING['/Users/sminnee/Sites/mysite'] = 'http://mysite.localhost';
|
||||
$_FILE_TO_URL_MAPPING['/Users/sminnee/Sites/my_silverstripe_project'] = 'http://project.localhost';
|
||||
|
||||
### Usage
|
||||
|
||||
Sake is particularly useful for running build tasks
|
||||
Sake can run any controller by passing the relative URL to that controller.
|
||||
|
||||
:::bash
|
||||
sake /
|
||||
# returns the homepage
|
||||
|
||||
sake dev/
|
||||
# shows a list of development operations
|
||||
|
||||
Sake is particularly useful for running build tasks.
|
||||
|
||||
:::bash
|
||||
cd /your/site/folder
|
||||
sake dev/build "flush=1"
|
||||
|
||||
Or running unit tests..
|
||||
|
||||
:::bash
|
||||
sake dev/tests/all
|
||||
|
||||
It can also be handy if you have a long running script.
|
||||
It can also be handy if you have a long running script..
|
||||
|
||||
:::bash
|
||||
cd /your/site/folder
|
||||
sake dev/tasks/MyReallyLongTask
|
||||
|
||||
### Running processes
|
||||
|
||||
You can use sake to make daemon processes for your application.
|
||||
`sake` can be used to make daemon processes for your application.
|
||||
|
||||
Step 1: Make a task or controller class that runs a loop. To avoid memory leaks, you should make the PHP process exit
|
||||
when it hits some reasonable memory limit. Sake will automatically restart your process whenever it exits.
|
||||
Make a task or controller class that runs a loop. To avoid memory leaks, you should make the PHP process exit when it
|
||||
hits some reasonable memory limit. Sake will automatically restart your process whenever it exits.
|
||||
|
||||
Step 2: Include some appropriate sleep()s so that your process doesn't hog the system. The best thing to do is to have
|
||||
a short sleep when the process is in the middle of doing things, and a long sleep when doesn't have anything to do.
|
||||
Include some appropriate sleep()s so that your process doesn't hog the system. The best thing to do is to have a short
|
||||
sleep when the process is in the middle of doing things, and a long sleep when doesn't have anything to do.
|
||||
|
||||
This code provides a good template:
|
||||
|
||||
@ -115,22 +125,21 @@ This code provides a good template:
|
||||
}
|
||||
}
|
||||
|
||||
Step 3: Install the "daemon" command-line tool on your server.
|
||||
|
||||
Step 4: Use sake to start and stop your process
|
||||
Then the process can be managed through `sake`
|
||||
|
||||
:::bash
|
||||
sake -start MyProcess
|
||||
sake -stop MyProcess
|
||||
|
||||
|
||||
|
||||
<div class="notice">
|
||||
Sake stores Pid and log files in the site root directory.
|
||||
`sake` stores `pid` and log files in the site root directory.
|
||||
</div>
|
||||
|
||||
## GET parameters as arguments
|
||||
## Arguments
|
||||
|
||||
You can add parameters to the command by using normal form encoding. All parameters will be available in `$_GET` within
|
||||
SilverStripe. Using the `cli-script.php` directly:
|
||||
Parameters can be added to the command. All parameters will be available in `$_GET` array on the server.
|
||||
|
||||
:::bash
|
||||
cd your-webroot/
|
||||
@ -143,8 +152,10 @@ Or if you're using `sake`
|
||||
|
||||
## Running Regular Tasks With Cron
|
||||
|
||||
On a UNIX machine, you can typically run a scheduled task with a [cron job](http://en.wikipedia.org/wiki/Cron). You can
|
||||
execute any `BuildTask` in SilverStripe as a cron job using `Sake`.
|
||||
On a UNIX machine, you can typically run a scheduled task with a [cron job](http://en.wikipedia.org/wiki/Cron). Run
|
||||
`BuildTask` in SilverStripe as a cron job using `sake`.
|
||||
|
||||
The following will run `MyTask` every minute.
|
||||
|
||||
:::bash
|
||||
* * * * * /your/site/folder/sake dev/tasks/MyTask
|
||||
|
||||
Loading…
Reference in New Issue
Block a user