gistfile1.txt

~/projects/jruby ➔ jruby -J-Xrunjdwp:transport=dt_socket,server=y,address=12345,suspend=n -S jirb
Listening for transport dt_socket at address: 12345
irb(main):001:0> require 'java'
=> true
irb(main):002:0> vmm = com.sun.jdi.Bootstrap.virtual_machine_manager
=> com.sun.tools.jdi.VirtualMachineManagerImpl@67fc9fee
irb(main):003:0> vmm.attaching_connectors
=> [com.sun.jdi.SocketAttach (defaults: timeout=, hostname=charles-nutters-macbook-pro.local, port=), com.sun.jdi.ProcessAttach (defaults: pid=, timeout=)]
irb(main):004:0> sock_attach = vmm.attaching_connectors[0]
=> com.sun.jdi.SocketAttach (defaults: timeout=, hostname=charles-nutters-macbook-pro.local, port=)
irb(main):005:0> sock_attach.default_arguments
=> {timeout=timeout=, hostname=hostname=charles-nutters-macbook-pro.local, port=port=}
irb(main):006:0> args = _                                                 
=> {timeout=timeout=, hostname=hostname=charles-nutters-macbook-pro.local, port=port=}
irb(main):007:0> args['port'].value = "12345"
=> "12345"
irb(main):008:0> vm = sock_attach.attach(args)
=> com.sun.tools.jdi.VirtualMachineImpl@1f183871
irb(main):009:0> my_struct = Struct.new(:blah)
=> #<Class:01x67ce08c7>
irb(main):010:0> structs = Array.new(10) {my_struct.new('hello')}
=> [#<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">, #<struct #<Class:01x67ce08c7> blah="hello">]
irb(main):011:0> struct_ref = vm.classes_by_name("org.jruby.RubyStruct")
=> [class org.jruby.RubyStruct (no class loader)]
irb(main):012:0> struct_ref = struct_ref[0]
=> class org.jruby.RubyStruct (no class loader)
irb(main):013:0> struct_ref.class
=> Java::ComSunToolsJdi::ClassTypeImpl
irb(main):014:0> struct_ref.instances(20)
=> [instance of org.jruby.RubyStruct(id=57), instance of org.jruby.RubyStruct(id=58), instance of org.jruby.RubyStruct(id=59), instance of org.jruby.RubyStruct(id=60), instance of org.jruby.RubyStruct(id=61), instance of org.jruby.RubyStruct(id=62), instance of org.jruby.RubyStruct(id=63), instance of org.jruby.RubyStruct(id=64), instance of org.jruby.RubyStruct(id=65), instance of org.jruby.RubyStruct(id=66)]
irb(main):015:0>