Class: RedisCacheStore

Inherits:
Object
  • Object
show all
Defined in:
lib/cache_store_redis.rb

Overview

This class is used to implement a redis cache store.

Instance Method Summary collapse

Constructor Details

#initialize(namespace = nil, config = nil) ⇒ RedisCacheStore

Returns a new instance of RedisCacheStore.



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# File 'lib/cache_store_redis.rb', line 10

def initialize(namespace = nil, config = nil)
  unless RUBY_PLATFORM == 'java'
    require 'oj'
  end

  @namespace = namespace
  @config = config
  @queue = Queue.new

  @connections_created = 0
  @connections_in_use = 0
  @mutex = Mutex.new
  @enable_stats = false
end

Instance Method Details

#clean ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 82

def clean
  while @queue.length.positive?
    client = @queue.pop(true)
    client.close
  end
end

#configure(host = 'localhost', port = 6379, db = 'default', password = nil, driver: nil, url: nil, connect_timeout: 0.5, read_timeout: 1, write_timeout: 0.5) ⇒ Object

This method is called to configure the connection to the cache store.



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# File 'lib/cache_store_redis.rb', line 48

def configure(host = 'localhost',
              port = 6379,
              db = 'default',
              password = nil,
              driver: nil,
              url: nil,
              connect_timeout: 0.5,
              read_timeout: 1,
              write_timeout: 0.5)
  if !url.nil?
    @config = {}
    @config[:url] = url
    @config[:db] = db
  else
    @config = { host: host, port: port, db: db }
  end

  @config[:password] = password unless password.nil?
  @config[:driver] = driver unless driver.nil?

  @config[:connect_timeout] = connect_timeout
  @config[:read_timeout] = read_timeout
  @config[:write_timeout] = write_timeout
end

#decrement_using_stat ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 41

def decrement_using_stat
  @mutex.synchronize do
    @connections_in_use -= 1
  end
end

#enable_stats=(value) ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 25

def enable_stats=(value)
  @enable_stats = value
end

#exist?(key) ⇒ Boolean

This method is called to check if a value exists within this cache store for a specific key.

Parameters:

  • key (String) —

    This is the unique key to reference the value to check for within this cache store.

Returns:

  • (Boolean) —

    True or False to specify if the key exists in the cache store.



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# File 'lib/cache_store_redis.rb', line 176

def exist?(key)
  with_client do |client|
    client.exists(build_key(key))
  end
end

#fetch_client ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 73

def fetch_client
  begin
    @queue.pop(true)
  rescue
    increment_created_stat
    Redis.new(@config)
  end
end

#get(key, expires_in = 0, &block) ⇒ Object

This method is called to get a value from this cache store by it’s unique key.

(This is used in conjunction with the block to hydrate the cache key if it is empty.) when it is not found.

Parameters:

  • key (String) —

    This is the unique key to reference the value to fetch from within this cache store.

  • expires_in (Integer) (defaults to: 0) —

    This is the number of seconds from the current time that this value should expire.

  • &block (Block) —

    This block is provided to hydrate this cache store with the value for the request key

Returns:

  • (Object) —

    The value for the specified unique key within the cache store.



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# File 'lib/cache_store_redis.rb', line 142

def get(key, expires_in = 0, &block)
  k = build_key(key)

  value = with_client do |client|
    client.get(k)
  end

  if !value.nil? && value.delete('\"').strip.empty?
    value = nil
  else
    value = deserialize(value) unless value.nil?
  end

  if value.nil? && block_given?
    value = yield
    set(key, value, expires_in)
  end

  value
end

#increment_created_stat ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 29

def increment_created_stat
  @mutex.synchronize do
    @connections_created += 1
  end
end

#increment_using_stat ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 35

def increment_using_stat
  @mutex.synchronize do
    @connections_in_use += 1
  end
end

#log_stats ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 89

def log_stats
  return unless @enable_stats == true
  S1Logging.logger.debug do
    "[#{self.class}] - REDIS Connection Stats. Process: #{Process.pid} | " \
"Created: #{@connections_created} | Pending: #{@queue.length} | In use: #{@connections_in_use}"
  end
end

#ping ⇒ String

Ping the cache store.

Returns:

  • (String) —

    PONG



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# File 'lib/cache_store_redis.rb', line 185

def ping
  with_client do |client|
    client.ping
  end
end

#remove(key) ⇒ Object

This method is called to remove a value from this cache store by it’s unique key.

Parameters:

  • key (String) —

    This is the unique key to reference the value to remove from this cache store.



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# File 'lib/cache_store_redis.rb', line 166

def remove(key)
  with_client do |client|
    client.del(build_key(key))
  end
end

#set(key, value, expires_in = 0) ⇒ Object

This method is called to set a value within this cache store by it’s key.

Parameters:

  • key (String) —

    This is the unique key to reference the value being set within this cache store.

  • value (Object) —

    This is the value to set within this cache store.

  • expires_in (Integer) (defaults to: 0) —

    This is the number of seconds from the current time that this value should expire.



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# File 'lib/cache_store_redis.rb', line 116

def set(key, value, expires_in = 0)
  k = build_key(key)

  v = if value.nil? || (value.is_a?(String) && value.strip.empty?)
        nil
      else
        serialize(value)
      end

  with_client do |client|
    client.multi do
      client.set(k, v)

      client.expire(k, expires_in) if expires_in.positive?
    end
  end
end

#with_client ⇒ Object 



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# File 'lib/cache_store_redis.rb', line 97

def with_client
  log_stats
  begin
    client = fetch_client
    increment_using_stat
    log_stats
    yield client
  ensure
    @queue.push(client)
    decrement_using_stat
    log_stats
  end
end