Merge branch 'feature/lazy-loading' into dev

lib/redistat/finder.rb

@@ -2,97 +2,7 @@ module Redistat
   class Finder
     include Database
     
-    attr_reader :options
-    
-    def initialize(options = {})
-      @options = options
-    end
-    
-    def db
-      super(@options[:connection_ref])
-    end
-    
-    def valid_options?
-      return true if !@options[:scope].blank? && !@options[:label].blank? && !@options[:from].blank? && !@options[:till].blank?
-      false
-    end
-    
-    def find(options = {})
-      @options.merge!(options)
-      raise InvalidOptions.new if !valid_options?
-      if @options[:interval].nil? || !@options[:interval]
-        find_by_magic
-      else
-        find_by_interval
-      end
-    end
-    
-    def find_by_interval(options = {})
-      @options.merge!(options)
-      raise InvalidOptions.new if !valid_options?
-      key = build_key
-      col = Collection.new(@options)
-      col.total = Result.new(@options)
-      build_date_sets.each do |set|
-        set[:add].each do |date|
-          result = Result.new
-          result.date = Date.new(date).to_time
-          db.hgetall("#{key.prefix}#{date}").each do |k, v|
-            result[k] = v
-            col.total.set_or_incr(k, v.to_i)
-          end
-          col << result
-        end
-      end
-      col
-    end
-    
-    def find_by_magic(options = {})
-      @options.merge!(options)
-      raise InvalidOptions.new if !valid_options?
-      key = Key.new(@options[:scope], @options[:label])
-      col = Collection.new(@options)
-      col.total = Result.new(@options)
-      col << col.total
-      build_date_sets.each do |set|
-        sum = Result.new
-        sum = summarize_add_keys(set[:add], key, sum)
-        sum = summarize_rem_keys(set[:rem], key, sum)
-        sum.each do |k, v|
-          col.total.set_or_incr(k, v.to_i)
-        end
-      end
-      col
-    end
-    
-    def build_date_sets
-      Finder::DateSet.new(@options[:from], @options[:till], @options[:depth], @options[:interval])
-    end
-    
-    def build_key
-      Key.new(@options[:scope], @options[:label])
-    end
-    
-    def summarize_add_keys(sets, key, sum)
-      sets.each do |date|
-        db.hgetall("#{key.prefix}#{date}").each do |k, v|
-          sum.set_or_incr(k, v.to_i)
-        end
-      end
-      sum
-    end
-    
-    def summarize_rem_keys(sets, key, sum)
-      sets.each do |date|
-        db.hgetall("#{key.prefix}#{date}").each do |k, v|
-          sum.set_or_incr(k, -v.to_i)
-        end
-      end
-      sum
-    end
-    
     class << self
-    
       def find(*args)
         new.find(*args)
       end
@@ -126,15 +36,49 @@ module Redistat
       def interval(unit)
         new.interval(unit)
       end
-      
+    end
+    
+    attr_reader :options
+    
+    def initialize(options = {})
+      @options = options
+    end
+    
+    def all(reload = false)
+      @result = nil if reload
+      @result ||= find
+    end
+    
+    def total
+      all.total
+    end
+    
+    def each(&block)
+      all.each(&block)
+    end
+    
+    def map(&block)
+      all.map(&block)
+    end
+    
+    def each_with_index(&block)
+      all.each_with_index(&block)
+    end
+    
+    def connection_ref(ref)
+      reset! if @options[:connection_ref] != ref
+      @options[:connection_ref] = ref
+      self
     end
     
     def scope(scope)
+      reset! if @options[:scope] != scope
       @options[:scope] = scope
       self
     end
     
     def label(label)
+      reset! if @options[:label] != label
       @options[:label] = label
       self
     end
@@ -145,25 +89,124 @@ module Redistat
     alias :date :dates
     
     def from(date)
+      reset! if @options[:from] != date
       @options[:from] = date
       self
     end
     
     def till(date)
+      reset! if @options[:till] != date
       @options[:till] = date
       self
     end
     alias :until :till
     
     def depth(unit)
+      reset! if @options[:depth] != unit
       @options[:depth] = unit
       self
     end
     
     def interval(unit)
+      reset! if @options[:interval] != unit
       @options[:interval] = unit
       self
     end
     
+    def find(options = {})
+      set_options(options)
+      raise InvalidOptions.new if !valid_options?
+      if @options[:interval].nil? || !@options[:interval]
+        find_by_magic
+      else
+        find_by_interval
+      end
+    end
+    
+    private
+    
+    def set_options(opts = {})
+      opts = opts.clone
+      opts.each do |key, value|
+        self.send(key, opts.delete(key)) if self.respond_to?(key)
+      end
+      @options.merge!(opts)
+    end
+    
+    def find_by_interval(options = {})
+      raise InvalidOptions.new if !valid_options?
+      key = build_key
+      col = Collection.new(@options)
+      col.total = Result.new(@options)
+      build_date_sets.each do |set|
+        set[:add].each do |date|
+          result = Result.new
+          result.date = Date.new(date).to_time
+          db.hgetall("#{key.prefix}#{date}").each do |k, v|
+            result[k] = v
+            col.total.set_or_incr(k, v.to_i)
+          end
+          col << result
+        end
+      end
+      col
+    end
+    
+    def find_by_magic(options = {})
+      raise InvalidOptions.new if !valid_options?
+      key = Key.new(@options[:scope], @options[:label])
+      col = Collection.new(@options)
+      col.total = Result.new(@options)
+      col << col.total
+      build_date_sets.each do |set|
+        sum = Result.new
+        sum = summarize_add_keys(set[:add], key, sum)
+        sum = summarize_rem_keys(set[:rem], key, sum)
+        sum.each do |k, v|
+          col.total.set_or_incr(k, v.to_i)
+        end
+      end
+      col
+    end
+
+    def reset!
+      @result = nil
+    end
+    
+    def valid_options?
+      return true if !@options[:scope].blank? && !@options[:label].blank? && !@options[:from].blank? && !@options[:till].blank?
+      false
+    end
+    
+    def build_date_sets
+      Finder::DateSet.new(@options[:from], @options[:till], @options[:depth], @options[:interval])
+    end
+    
+    def build_key
+      Key.new(@options[:scope], @options[:label])
+    end
+    
+    def summarize_add_keys(sets, key, sum)
+      sets.each do |date|
+        db.hgetall("#{key.prefix}#{date}").each do |k, v|
+          sum.set_or_incr(k, v.to_i)
+        end
+      end
+      sum
+    end
+    
+    def summarize_rem_keys(sets, key, sum)
+      sets.each do |date|
+        db.hgetall("#{key.prefix}#{date}").each do |k, v|
+          sum.set_or_incr(k, -v.to_i)
+        end
+      end
+      sum
+    end
+    
+    def db
+      super(@options[:connection_ref])
+    end
+    
   end
 end

lib/redistat/model.rb

@@ -6,31 +6,36 @@ module Redistat
       base.extend(self)
     end
     
+    #
+    # statistics store/fetch methods
+    # 
+    
     def store(label, stats = {}, date = nil, meta = {}, opts = {})
       Event.new(name, label, date, stats, options.merge(opts), meta).save
     end
     alias :event :store
+
+    def fetch(label, from, till, opts = {})
+      find(label, from, till, opts).all
+    end
+    alias :lookup :fetch
+
+    def find(label, from, till, opts = {})
+      Finder.new( { :scope => name,
+                    :label => label,
+                    :from  => from,
+                    :till  => till }.merge(options.merge(opts)) )
+    end
+    
+    #
+    # options methods
+    #
     
     def connect_to(opts = {})
       Connection.create(opts.merge(:ref => name))
       options[:connection_ref] = name
     end
     
-    def connection
-      db(options[:connection_ref])
-    end
-    alias :redis :connection
-    
-    def fetch(label, from, till, opts = {})
-      Finder.find({
-        :scope => name,
-        :label => label,
-        :from  => from,
-        :till  => till
-      }.merge(options.merge(opts)))
-    end
-    alias :lookup :fetch
-    
     def hashed_label(boolean = nil)
       if !boolean.nil?
         options[:hashed_label] = boolean
@@ -64,15 +69,22 @@ module Redistat
       end
     end
     
+    #
+    # resource access methods
+    #
+    
+    def connection
+      db(options[:connection_ref])
+    end
+    alias :redis :connection
+    
     def options
       @options ||= {}
     end
     
-    private
-    
     def name
       options[:class_name] || (@name ||= self.to_s)
     end
-    
+      
   end
 end

spec/finder_spec.rb

@@ -19,6 +19,10 @@ describe Redistat::Finder do
     
     finder = Redistat::Finder.new(options)
     finder.options.should == options
+    
+    finder = Redistat::Finder.new
+    finder.send(:set_options, options)
+    finder.options.should == options
 
     finder = Redistat::Finder.dates(two_hours_ago, one_hour_ago).scope("PageViews").label("Label").depth(:hour).interval(:hour)
     finder.options.should == options
@@ -85,6 +89,65 @@ describe Redistat::Finder do
     lambda { Redistat::Finder.find(:from => 3.hours.ago) }.should raise_error(Redistat::InvalidOptions)
   end
   
+  describe "Lazy-Loading" do
+    
+    before(:each) do
+      @first_stat, @last_stat = create_example_stats
+
+      @finder = Redistat::Finder.new
+      @finder.from(@first_stat).till(@last_stat).scope(@scope).label(@label).depth(:hour)
+      
+      @match = [{}, {"visitors"=>"4", "views"=>"6"},
+                    {"visitors"=>"2", "views"=>"3"},
+                    {"visitors"=>"2", "views"=>"3"}, {}]
+    end
+    
+    it "should lazy-load" do
+
+      @finder.instance_variable_get("@result").should be_nil
+      stats = @finder.all
+      @finder.instance_variable_get("@result").should_not be_nil
+      
+      stats.should == @finder.find # find method directly fetches results
+      stats.total.should == @finder.total
+      stats.total.should == { "views" => 12, "visitors" => 8 }
+      stats.total.from.should == @first_stat
+      stats.total.till.should == @last_stat
+      stats.first.should == stats.total
+
+      @finder.all.object_id.should == stats.object_id
+      @finder.from(@first_stat + 2.hours)
+      @finder.instance_variable_get("@result").should be_nil
+      @finder.all.object_id.should_not == stats.object_id
+      stats = @finder.all
+      stats.total.should == { "views" => 6, "visitors" => 4 }
+    end
+    
+    it "should handle #map" do
+      @finder.interval(:hour)
+      @finder.map { |r| r }.should == @match
+    end
+    
+    it "should handle #each" do
+      @finder.interval(:hour)
+      
+      res = []
+      @finder.each { |r| res << r }
+      res.should == @match
+    end
+    
+    it "should handle #each_with_index" do
+      @finder.interval(:hour)
+      
+      res = {}
+      match = {}
+      @finder.each_with_index { |r, i| res[i] = r }
+      @match.each_with_index { |r, i| match[i] = r }
+      res.should == match
+    end
+    
+  end
+  
   
   # helper methods
   
@@ -93,7 +156,7 @@ describe Redistat::Finder do
     Redistat::Summary.update(key, @stats, :hour)
     key = Redistat::Key.new(@scope, @label, Time.parse("2010-05-14 13:53"))
     Redistat::Summary.update(key, @stats, :hour)
-    key = Redistat::Key.new(@scope, @label, Time.parse("2010-05-14 14:32"))
+    key = Redistat::Key.new(@scope, @label, Time.parse("2010-05-14 14:52"))
     Redistat::Summary.update(key, @stats, :hour)
     key = Redistat::Key.new(@scope, @label, (last = Time.parse("2010-05-14 15:02")))
     Redistat::Summary.update(key, @stats, :hour)

spec/model_spec.rb

@@ -17,6 +17,17 @@ describe Redistat::Model do
     ModelHelper2.send(:name).should == "ModelHelper2"
   end
   
+  it "should return a Finder" do
+    two_hours_ago = 2.hours.ago
+    one_hour_ago  = 1.hour.ago
+    finder = ModelHelper1.find('label', two_hours_ago, one_hour_ago)
+    finder.should be_a(Redistat::Finder)
+    finder.options[:scope].should == 'ModelHelper1'
+    finder.options[:label].should == 'label'
+    finder.options[:from].should  == two_hours_ago
+    finder.options[:till].should  == one_hour_ago
+  end
+  
   it "should listen to model-defined options" do
     ModelHelper2.depth.should == :day
     ModelHelper2.store_event.should == true