Class: VisitCounter::Store::RedisStore

Inherits:
AbstractStore show all
Defined in:
lib/visit-counter/store/redis_store.rb

Constant Summary collapse

@@redis = 
nil

Class Method Summary collapse

Class Method Details

.acquire_lock(object) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 41

def acquire_lock(object)
  redis.setnx(lock_key(object), 1)
end

.get(key) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 29

def get(key)
  redis.get(key).to_i
end

.incr(key) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 25

def incr(key)
  redis.incr(key).to_i
end

.lock_key(object) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 49

def lock_key(object)
  "#{object.class.name.downcase}_#{object.id}_object_cache_lock"
end

.nullify(key) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 33

def nullify(key)
  redis.set(key, 0)
end

.redis ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 17

def redis
  if @@redis.nil? && defined?($redis)
    @@redis = $redis
  else
    @@redis
  end
end

.redis=(r) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 9

def redis=(r)
  if r.is_a?(Redis)
    @@redis = r
  else
    @@redis = Redis.new(r)
  end
end

.substract(key, by) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 37

def substract(key, by)
  redis.decrby(key, by)
end

.unlock!(object) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 45

def unlock!(object)
  redis.del(lock_key(object))
end

.with_lock(object, &block) ⇒ Object 



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# File 'lib/visit-counter/store/redis_store.rb', line 53

def with_lock(object, &block)
  if acquire_lock(object)
    begin
      yield
    ensure
      unlock!(object)
    end
  end
end