added a couple of comments regarding dependent gems. added initial sq…

…lite3 address book

address_books/csv_address_book.rb

@@ -11,9 +11,11 @@ def initialize
   end
 
   def configure(config)
-    CSV.open(config['file']) do |row|
-      @servers << {:host => row[1], :port => row[2].to_i}
-    end
+    @mutex.synchronize {
+      CSV.open(config['file']) do |row|
+        @servers << {:host => row[1], :port => row[2].to_i}
+      end
+    }
   end
 
   # this method should return an array of hosts which this request is qualified to connect to.

address_books/sqlite3_address_book.rb

@@ -0,0 +1,33 @@
+require 'singleton'
+require 'thread'
+require 'sqlite3' # gem install sqlite3-ruby
+
+class AddressBook
+  include Singleton
+
+  def initialize
+    @mutex = Mutex.new
+  end
+
+  def configure(config)
+    @db = SQLite3::Database.new(config['database'])
+    @query = config['finder_sql']
+  end
+
+  # this method should return an array of hosts which this request is qualified to connect to.
+  # which is determined based on the contents of the data passed
+  def lookup_addresses(data)
+    # TODO: make this use real parameters from the data payload
+    # Example:
+    # req_host = data['host']
+    # @db.execute(@query, req_host)
+    servers = []
+    @mutex.synchronize {
+      @db.execute(@query) do |row|
+        servers << {:host => row[0], :port => row[1]}
+      end
+    }
+    return servers if servers.any?
+    return nil
+  end
+end

panels/eventmachine_panel.rb

@@ -1,5 +1,5 @@
 require 'rubygems'
-require 'eventmachine'
+require 'eventmachine' # gem install eventmachine
 require 'stringio'
 
 class BackendRequest < EventMachine::Connection

panels/rev_panel.rb

@@ -1,5 +1,5 @@
 require 'rubygems'
-require 'rev'
+require 'rev' # gem install rev
 
 class BackendRequest < Rev::TCPSocket
   attr_accessor :frontend