Query: poet::cache
OS: debian
Section: 3pm
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
Poet::Cache(3pm) User Contributed Perl Documentation Poet::Cache(3pm)NAMEPoet::Cache -- Poet caching with CHISYNOPSIS# In a conf file... cache: defaults: driver: Memcached servers: ["10.0.0.15:11211", "10.0.0.15:11212"] # In a script... use Poet::Script qw($cache); # In a module... use Poet qw($cache); # In a component... my $cache = $m->cache; # For an arbitrary namespace... my $cache = Poet::Cache->new(namespace => 'Some::Namespace') # then... my $customer = $cache->get($name); if ( !defined $customer ) { $customer = get_customer_from_db($name); $cache->set( $name, $customer, "10 minutes" ); } my $customer2 = $cache->compute($name2, "10 minutes", sub { get_customer_from_db($name2) });DESCRIPTIONPoet::Cache is a subclass of CHI. CHI provides a unified caching API over a variety of storage backends, such as memory, plain files, memory mapped files, memcached, and DBI. Each package and Mason component uses its own CHI namespace so that caches remain separate.CONFIGURATIONThe Poet configuration entry 'cache', if any, will be passed to Poet::Cache->config(). This can go in any Poet conf file, e.g. "local.cfg" or "global/cache.cfg". Here's a simple configuration that caches everything to files under "data/cache". This is also the default if no configuration is present. cache: defaults: driver: File root_dir: ${root}/data/cache Here's a more involved configuration that defines several "storage types" and assigns each namespace a storage type. cache: defaults: expires_variance: 0.2 storage: file: driver: File root_dir: ${root}/data/cache memcached: driver: Memcached servers: ["10.0.0.15:11211", "10.0.0.15:11212"] compress_threshold: 4096 namespace: /some/component: { storage: file, expires_in: 5min } /some/other/component: { storage: memcached, expires_in: 1h } Some::Library: { storage: memcached, expires_in: 10min } Given the configuration above, and the code package Some::Library; use Poet qw($cache); this $cache will be created with properties driver: Memcached servers: ["10.0.0.15:11211", "10.0.0.15:11212"] compress_threshold: 4096 expires_in: 10minUSAGEObtaining cache handle o In a script (namespace will be 'main'): use Poet::Script qw($cache); o In a module "MyApp::Foo" (namespace will be 'MyApp::Foo'): use Poet qw($cache); o In a component "/foo/bar" (namespace will be '/foo/bar'): my $cache = $m->cache; o Manually for an arbitrary namespace: my $cache = Poet::Cache->new(namespace => 'Some::Namespace'); # or my $cache = MyApp::Cache->new(category => 'Some::Namespace'); Using cache handle my $customer = $cache->get($name); if ( !defined $customer ) { $customer = get_customer_from_db($name); $cache->set( $name, $customer, "10 minutes" ); } my $customer2 = $cache->compute($name2, "10 minutes", sub { get_customer_from_db($name2) }); See CHI and Mason::Plugin::Cache for more details.MODIFIABLE METHODSThese methods are not intended to be called externally, but may be useful to override or modify with method modifiers in subclasses. initialize_caching Called once when the Poet environment is initialized. By default, calls "__PACKAGE__->config" with the configuration entry 'cache'.SEE ALSOPoetAUTHORJonathan Swartz <swartz@pobox.com>COPYRIGHT AND LICENSEThis software is copyright (c) 2012 by Jonathan Swartz. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-06-05 Poet::Cache(3pm)
Related Man Pages |
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chi::driver::fastmmap(3pm) - debian |
chi::driver::rawmemory(3pm) - debian |
mason::plugin::cache(3pm) - debian |
poet::cache(3pm) - debian |
poet::import(3pm) - debian |
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