Koine Delayed Cache
Delayed Cache is a wrapper for Zend Cache. Sometimes you have parallel requests
want a cached result that was already started, but is still under construction.
Delayed cache will wait until it is ready and then it will return the result
for you., (*1)
Code information:, (*2)
, (*3)
Package information:, (*4)
, (*5)
Installing
Installing via Composer
Append the lib to your requirements key in your composer.json., (*6)
{
// composer.json
// [..]
require: {
// append this line to your requirements
"koine/delayed-cache": "dev-master"
}
}
Alternative install
Usage
$zendCache = $cache = \Zend\Cache\StorageFactory::adapterFactory(
'apc',
array('ttl' => 3600)
);
$delayedCache = new \Koine\DelayedCache\DelayedCache($zendCache);
// index.php, second 10:00:00 am
$cacheKey = 'veryExpansiveCalculation';
$veryExpansiveCalculation = function () {
sleep(60);
return '42';
};
// hasItem returns true in the false time
if (!$delayedCache->hasItem($cacheKey)) {
$delayedCache->setItem($cacheKey, $veryExpansiveCalculation);
}
$answer = $delayedCache->getItem($cacheKey);
echo 'answer is: ' . $answer;
// index.php, 10:00:10 am
$cacheKey = 'veryExpansiveCalculation';
$veryExpansiveCalculation = function () {
sleep(60);
return '42';
};
// although the result is not ready yet, hasItem will return true
if (!$delayedCache->hasItem($cacheKey)) {
$delayedCache->setItem($cacheKey, $veryExpansiveCalculation);
}
// Waits 50 seconds until the building of the cache is done and then returns
// The $veryExpansiveCalculation callback will not be executed twice, unless the
// cache is cleared
$answer = $delayedCache->getItem($cacheKey);
echo 'answer is: ' . $answer;
Alternatively you can use the short method:, (*7)
$cacheKey = 'veryExpansiveCalculation';
$veryExpansiveCalculation = function () {
sleep(60);
return '42';
};
// if cache is not set, it will set and then return the cached value
$answer = $delayedCache->getCachedItem($cacheKey, $veryExpansiveCalculation);
echo 'answer is: ' . $answer;
, (*8)
Issues/Features proposals
Here is the issue tracker., (*9)
Contributing
Only TDD code will be accepted. Please follow the PSR-2 code standard., (*10)
- Fork it
- Create your feature branch (
git checkout -b my-new-feature)
- Commit your changes (
git commit -am 'Add some feature')
- Push to the branch (
git push origin my-new-feature)
- Create new Pull Request
How to run the tests:
phpunit
To check the code standard run:
# Fixes code
./bin/php-cs-fix.sh
# outputs error
./bin/php-cs-fix.sh src true
./bin/php-cs-fix.sh test true
Lincense
MIT, (*11)
Authors
Wallogit.com
