add: user and platform cache

app/services/cache/user_pullrequest_count_service.rb

@@ -0,0 +1,43 @@
+class Cache::UserPullrequestCountService < ApplicationService 
+  attr_reader :user, :increment_count
+
+  def initialize(user, increment_count=0)
+    @user = user
+    @increment_count = increment_count
+  end
+
+  def call 
+    set_user_pullrequest_count
+
+    user_pullrequest_count
+  end
+
+  def reset 
+    reset_user_pullrequest_count
+
+    user_pullrequest_count
+  end
+
+  private 
+
+  def user_pullrequest_count_key 
+    "user-pullrequest-count-#{user.id}"
+  end
+
+  def user_pullrequest_count 
+    $redis_cache.get(user_pullrequest_count_key).to_i
+  end
+
+  def set_user_pullrequest_count 
+    if $redis_cache.exists(user_pullrequest_count_key)
+      $redis_cache.incrby(user_pullrequest_count_key, increment_count)
+    else
+      reset_user_pullrequest_count
+    end
+  end
+
+  def reset_user_pullrequest_count
+    return if user.nil?
+    $redis_cache.set(user_pullrequest_count_key, PullRequest.where(user_id: user.id).count)
+  end
+end