Eventmachine support

[treeder]

The following use cases could/should be supported in the end:

Synchronous, like it is now, eg:

results = @sdb.select("select * from sdb")
results.each do |r|
    # do something
end

EM async, eg:

@sdb.select("select * from sdb") do |results|
  results.each do |r|
      # do something
  end
end

Concur style, eg:

results_future = executor.execute do 
  @sdb.select("select * from sdb")
end
# at some point when the results are needed
results = results_future.get
results.each do |r|
  # do something
end

OR another concur style, initializing with executor

@sdb = Aws::SdbInterface.new(TestCredentials.aws_access_key_id, TestCredentials.aws_secret_access_key, :executor=>executor)

then:

results_future = @sdb.select("select * from sdb")
# at some point when the results are needed
results = results_future.get
results.each do |r|
  # do something
end

OR to mix sync with async:

results_future = @sdb.select("select * from sdb", :executor=>executor)

[treeder]

@rkononov I just pushed some changes where I'm trying to use a second EventMachine adapter using concur. See test_performance.rb for usage, but the idea is to be able to queue up a bunch of requests using the concur executor pattern and then get the results from the futures so it's not so callback spaghetti'ish (to the user at least), it's definitely spaghetti going on behind the scenes right now though ;). You'll need to get the latest concur code and build/install the gem to get it working.

I think it's close, but not quite there.