Fix memory usage

Gemfile

@@ -2,9 +2,3 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in truc.gemspec
 gemspec
-
-group :test do
-  gem 'hashery', '~> 2.1.1'
-  gem "yajl-ruby", require: 'yajl', platforms: [:ruby_19, :ruby_20, :ruby_21]
-end
-

Gemfile.lock

@@ -2,39 +2,36 @@ PATH
   remote: .
   specs:
     prismic.io (1.8.2)
-      hashery (~> 2.1.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.5.0)
-    hashery (2.1.2)
-    mini_portile2 (2.8.2)
-    nokogiri (1.15.2)
+    diff-lcs (1.6.2)
+    mini_portile2 (2.8.9)
+    nokogiri (1.19.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.15.2-java)
+    nokogiri (1.19.3-java)
       racc (~> 1.4)
-    nokogiri (1.15.2-x86_64-darwin)
+    nokogiri (1.19.3-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.15.2-x86_64-linux)
+    nokogiri (1.19.3-x86_64-linux-gnu)
       racc (~> 1.4)
-    racc (1.7.0)
-    racc (1.7.0-java)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.2)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.3)
+    racc (1.8.1)
+    racc (1.8.1-java)
+    rspec (3.13.2)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.5)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.8)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.0)
-    yajl-ruby (1.4.1)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.7)
 
 PLATFORMS
   java
@@ -43,12 +40,10 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  hashery (~> 2.1.1)
-  nokogiri (~> 1.6)
+  nokogiri
   prismic.io!
-  rspec (~> 3.12)
-  rspec-core (~> 3.12)
-  yajl-ruby
+  rspec
+  rspec-core
 
 BUNDLED WITH
-   2.2.20
+  4.0.12

lib/prismic/cache/lru.rb

@@ -1,7 +1,3 @@
-# encoding: utf-8
-
-require 'hashery'
-
 module Prismic
   # This is a simple cache class provided with the prismic.io Ruby kit.
   #
@@ -14,13 +10,12 @@ module Prismic
   # you can create your API object like this: `Prismic.api(url, cache:
   # Prismic::DefaultCache)`
   class LruCache
-
-    # @return [LRUHash<String,Object>]
     attr_reader :intern
 
     # @param max_size [Fixnum] (100) The default maximum of keys to store
-    def initialize(max_size=100)
-      @intern = Hashery::LRUHash.new(max_size)
+    def initialize(max_size = 100)
+      @max_size = max_size
+      @intern = {}
     end
 
     # Add a cache entry.
@@ -30,7 +25,9 @@ def initialize(max_size=100)
     #
     # @return [Object] The stored value
     def set(key, value, expired_in = nil)
-      @intern.store(key, { :data => value, :expired_in => expired_in = expired_in && Time.now.getutc.to_i + expired_in })
+      @intern.delete(key)
+      @intern[key] = { data: value, expired_in: expired_in && Time.now.getutc.to_i + expired_in }
+      @intern.delete(@intern.keys.first) while @intern.size > @max_size
       value
     end
 
@@ -45,16 +42,18 @@ def []=(key, value)
     # @return [Object] The cache object as was stored
     def get(key)
       return delete(key) if expired?(key)
-      include?(key) ? @intern[key][:data] : nil
+      return nil unless include?(key)
+
+      entry = @intern.delete(key)
+      @intern[key] = entry
+      entry[:data]
     end
-    alias :[] :get
+    alias [] get
 
     def get_or_set(key, value = nil, expired_in = nil)
-      if include?(key) && !expired?(key)
-        return get(key)
-      else
-        set(key, block_given? ? yield : value, expired_in)
-      end
+      return get(key) if include?(key) && !expired?(key)
+
+      set(key, block_given? ? yield : value, expired_in)
     end
 
     def delete(key)
@@ -70,10 +69,10 @@ def delete(key)
     def has_key?(key)
       @intern.has_key?(key)
     end
-    alias :include? :has_key?
+    alias include? has_key?
 
     def expired?(key)
-      if include?(key) && @intern[key][:expired_in] != nil
+      if include?(key) && !@intern[key][:expired_in].nil?
         expired_in = @intern[key][:expired_in]
         expired_in && expired_in < Time.now.getutc.to_i
       else
@@ -85,7 +84,7 @@ def expired?(key)
     def invalidate_all!
       @intern.clear
     end
-    alias :clear! :invalidate_all!
+    alias clear! invalidate_all!
 
     # Expose the Hash keys
     #
@@ -102,20 +101,17 @@ def keys
     def size
       @intern.size
     end
-    alias :length :size
-
+    alias length size
   end
 
   # Available as an api cache for testing purposes (no caching)
   class BasicNullCache
-    def get(key)
-    end
+    def get(key); end
 
-    def set(key, value = nil, expired_in = nil)
+    def set(_key, value = nil, _expired_in = nil)
       block_given? ? yield : value
     end
-    alias_method :get_or_set, :set
-
+    alias get_or_set set
   end
 
   # This default instance is used by the API to avoid creating a new instance