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Vendor whales
Package cache
Short Description Caching library
License

Keywords cache caching

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Example code of whales/cache

Informations about the package cache

Cache

Examples

Stampede Protection

Object Instantiation

Object Composition

Explanation

Assumption: The $persistentCache is primed so that there will always be some data returned even while the new data is being retrieved/regenerated.

When a request comes into $cachedService it will attempt to find the item in the cache
- The call to find will get passed on through:
  - LockReleaseOnSettingCacheMap, which delegates to:
  - LinkedNodeCacheMap
    - Here it will first check the $transientCache and either:
      - Hit, in which case it will return the cached value all the way back up to the original caller.
      - Miss and then:
        
        Check the $persistentCache, which is primed and should result in a hit, however since the LockAffectedCacheMap is wrapping the $persistentCache it will report a cache miss since the lock is available (i.e. nobody else is currently working on regenerating the data for the cache)
        
        The cache miss is then propogated all the way back up to CallableServiceCachingDecorator.
- Since the iterator returned from find is empty, the code then needs to call into the actual service to retrieve the fresh data.
  - The call to the service will pass through the MutexLockAcquiringDecorator object which will acquire the lock and let all future requests to the service know that someone is currently retrieving the data from the original datasource and regenerating the new cache data.
  - While the lock is held, all future requests will retrieve data from the stale $persistentCache. Remember that since this is wrapped in the LockAffectedCacheMap and the lock is now unavailable the $persistentCache will now report a cache hit and return it's stale data.
- After the service is called and the fresh data is returned back up to CallableServiceCachingDecorator, we then set the cache to reflect the new data.
- The call to set passes through LockReleaseOnSettingCacheMap which delegates the setting to LinkedNodeCacheMap which then will add the new data to both the $transientCache and $persistentCache (future stale cache).
- After setting the new values, the lock is then released.
- Finally the fresh data is passed out to the top-level caller.

All versions of cache with dependencies

PHP Build Version

Package Version

Version 0.2.0 Release 01. Nov 2014
create-project require 0 people chose require and
0 people chose create-project.

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