threads

19F/Threads.rb

@@ -0,0 +1,25 @@
+# Thread  - a light weight process.
+# Threads which belongs to a process shares the resources of that process.
+#
+# In Ruby - Thread class can be used to create thread.
+t1 = Time.now
+def sum(array)
+  sleep(2)
+  sum = 0
+  array.each do | i |
+    sum += i
+  end
+  sum
+end
+
+@item1 = [1,2,3,4,5]
+@item2 = [6,7,8,9,10]
+@item3 = [11,12,13,14,15]
+
+puts "item1 #{sum(@item1)}"
+puts "item2 #{sum(@item2)}"
+puts "item3 #{sum(@item3)}"
+
+t2 = Time.now
+
+puts "Total time taken to complete the prg is #{t2 - t1}"

19F/thread3.rb

@@ -0,0 +1,29 @@
+class A
+  class << self
+    attr_accessor :price
+  end
+  @price = 0
+end
+
+mutex = Mutex.new
+
+thread = (1..10).map do | i |
+
+  Thread.new(i) do | i |
+    mutex.synchronize do
+      items = A.price
+      sleep(rand(0..2))
+      items += 10
+      sleep(rand(0..2))
+      A.price = items
+    end
+  end
+end
+
+
+thread.each {|t| t.join}
+
+puts A.price
+
+
+Thread.abort_on_exception = true

19F/use_thread.rb

@@ -0,0 +1,25 @@
+t1 = Time.now
+def sum(array)
+  sleep(2)
+  sum = 0
+  array.each do | i |
+    sum += i
+  end
+  sum
+end
+
+@item1 = [1,2,3,4,5]
+@item2 = [6,7,8,9,10]
+@item3 = [11,12,13,14,15]
+
+thread = (1..3).map do | i |
+  Thread.new(i) do | i |
+    items = instance_variable_get("@item#{i}")
+    puts "item#{i} #{sum(items)}"
+  end
+end
+thread.each {|t| t.join}
+
+t2 = Time.now
+
+puts "Total time taken to complete the prg is #{t2 - t1}"

demo_app/Gemfile

@@ -10,6 +10,7 @@ gem 'autoprefixer-rails'
 gem "paperclip"
 gem 'rspec'
 gem 'rspec-rails'
+gem 'httparty'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.1.6'
 # Use sqlite3 as the database for Active Record

demo_app/Gemfile.lock

@@ -83,6 +83,8 @@ GEM
     ffi (1.9.25)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
+    httparty (0.14.0)
+      multi_xml (>= 0.5.2)
     i18n (1.1.1)
       concurrent-ruby (~> 1.0)
     jbuilder (2.8.0)
@@ -106,6 +108,7 @@ GEM
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multi_json (1.13.1)
+    multi_xml (0.6.0)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (5.0.2)
@@ -234,6 +237,7 @@ DEPENDENCIES
   capistrano
   capybara (~> 2.13)
   coffee-rails (~> 4.2)
+  httparty
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   paperclip