add replication test and example

examples/replication.rb

@@ -0,0 +1,29 @@
+require 'rubygems'
+require 'bdb/database'
+require 'fileutils'
+
+role = ARGV.shift || 'client'
+
+MASTER = 'localhost:8888'
+CLIENT = 'localhost:9999'
+
+DIR = "/tmp/#{role}"
+FileUtils.rmtree DIR
+FileUtils.mkdir  DIR
+
+puts "Starting #{role}..."
+
+Bdb::Environment.replicate DIR, :from => MASTER, :to => CLIENT, :host => role == 'master' ? MASTER : CLIENT
+db = Bdb::Database.new('foo', :path => DIR)
+
+loop do
+  100.times do |i|
+    if role == 'master'
+      db.set(i, db[i].to_i + 1)
+      puts "#{i}: #{db[i]}"
+    else
+      puts "#{i}: #{db[i]}"
+    end
+    sleep 0.1
+  end
+end

test/replication_test.rb

@@ -0,0 +1,47 @@
+require File.dirname(__FILE__) + '/database_test_helper'
+
+MASTER_DIR = '/tmp/bdb_rep_test_master'
+CLIENT_DIR = '/tmp/bdb_rep_test_client'
+FileUtils.rmtree MASTER_DIR; FileUtils.mkdir MASTER_DIR; 
+FileUtils.rmtree CLIENT_DIR; FileUtils.mkdir CLIENT_DIR
+
+MASTER = 'localhost:8888'
+CLIENT = 'localhost:8889'
+
+N = 100
+
+class ReplicationTest < Test::Unit::TestCase
+  def setup
+    Bdb::Environment.replicate CLIENT_DIR, :from => MASTER, :to => CLIENT, :host => CLIENT #, :verbose => true
+    
+    @pid = Process.fork do
+      Bdb::Environment.replicate MASTER_DIR, :from => MASTER, :to => CLIENT, :host => MASTER #, :verbose => true
+      db = Bdb::Database.new('foo', :path => MASTER_DIR)
+
+      N.times do |i|
+        db.set(i, i + 1)
+        log "m"
+        sleep 0.1
+      end
+      sleep 10
+    end
+  end
+  
+  def teardown
+    Process.kill(9, @pid)
+  end
+
+  def test_single_process_replication
+    db = Bdb::Database.new('foo', :path => CLIENT_DIR)
+    N.times do |i|
+      sleep 0.2
+      assert_equal i + 1, db[i]
+      log "c"
+    end
+  end
+
+  def log(action)
+    print action
+    $stdout.flush
+  end
+end