B: Active Support API Reference in Java

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Appendix B: Active Support API Reference
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compression To turn on compression either pass :compress => true in the initializer or to fetch or write To specify the threshold at which to compress values, set :compress_threshold The default threshold is 32K
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cleanup(options = nil)
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Cleanup the cache by removing expired entries Not all cache implementations may support this method Options are passed to the underlying cache implementation
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clear(options = nil)
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Clear the entire cache Not all cache implementations may support this method You should be careful with this method since it could affect other processes if you are using a shared cache Options are passed to the underlying cache implementation
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decrement(name, amount = 1, options = nil)
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Decrement an integer value in the cache Options are passed to the underlying cache implementation
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delete(name, options = nil)
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Delete an entry in the cache Returns true if there was an entry to delete Options are passed to the underlying cache implementation
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delete matched(matcher, options = nil)
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Delete all entries whose keys match a pattern Options are passed to the underlying cache implementation
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>> => >> => >> => >> => Railscachewrite :color, :red true Railscacheread :color :red Railscachedelete_matched "c" ["city", "color", "USA/FL/Jacksonville"] Railscacheread :color nil
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exist (name, options = nil)
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Return true if the cache contains an entry with this name Options are passed to the underlying cache implementation
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fetch(name, options = nil)
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Fetches data from the cache, using the given key If there is data in the cache with the given key, then that data is returned
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ActiveSupport::Cache::Store
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If there is no such data in the cache (a cache miss occurred), then nil will be returned However, if a block has been passed, then that block will be run in the event of a cache miss The return value of the block will be written to the cache under the given cache key, and that return value will be returned
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cachewrite("today", "Monday") cachefetch("today") # => "Monday" cachefetch("city") # => nil cachefetch("city") do "Duckburgh" end cachefetch("city") # => "Duckburgh"
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Active Support
You may also specify additional options via the options argument Setting :force => true will force a cache miss:
cachewrite("today", "Monday") cachefetch("today", :force => true) # => nil
Setting :compress will store a large cache entry set by the call in a compressed format Setting :expires_in will set an expiration time on the cache entry if it is set by call Setting :race_condition_ttl will invoke logic on entries set with an :expires_ in option If an entry is found in the cache that is expired and it has been expired for less than the number of seconds specified by this option and a block was passed to the method call, then the expiration future time of the entry in the cache will be updated to that many seconds in the and the block will be evaluated and written to the cache This is very useful in situations in which a cache entry is used very frequently under heavy load The first process to find an expired cache entry will then become responsible for regenerating that entry while other processes continue to use the slightly out of date entry This can prevent race conditions where too many processes are trying to regenerate the entry all at once If the process regenerating the entry errors out, the entry will be regenerated after the specified number of seconds
# Set all values to expire after one minute cache = ActiveSupport::Cache::MemoryCachenew(:expires_in => 1minute) cachewrite("foo", "original value") val_1 = nil val_2 = nil sleep 60
Appendix B: Active Support API Reference
Threadnew do val_1 = cachefetch("foo", :race_condition_ttl => 10) do sleep 1 "new value 1" end end Threadnew do val_2 = cachefetch("foo", :race_condition_ttl => 10) do "new value 2" end end # val_1 => "new value 1" # val_2 => "original value" # cachefetch("foo") => "new value 1"
Other options will be handled by the specific cache store implementation Internally, fetch calls read_entry, and calls write_entry on a cache miss Options will be passed to the read and write calls For example, MemCacheStore s write method supports the :raw option, which tells the memcached server to store all values as strings We can use this option with fetch too:
cache = ActiveSupport::Cache::MemCacheStorenew cachefetch("foo", :force => true, :raw => true) do :bar end cachefetch("foo") # => "bar"
increment(name, amount = 1, options = nil)