From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/lib/drb/gw.rb | 160 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 jni/ruby/lib/drb/gw.rb

(limited to 'jni/ruby/lib/drb/gw.rb')

diff --git a/jni/ruby/lib/drb/gw.rb b/jni/ruby/lib/drb/gw.rb
new file mode 100644
index 0000000..b3568ab
--- /dev/null
+++ b/jni/ruby/lib/drb/gw.rb
@@ -0,0 +1,160 @@
+require 'drb/drb'
+require 'monitor'
+
+module DRb
+
+  # Gateway id conversion forms a gateway between different DRb protocols or
+  # networks.
+  #
+  # The gateway needs to install this id conversion and create servers for
+  # each of the protocols or networks it will be a gateway between.  It then
+  # needs to create a server that attaches to each of these networks.  For
+  # example:
+  #
+  #   require 'drb/drb'
+  #   require 'drb/unix'
+  #   require 'drb/gw'
+  #
+  #   DRb.install_id_conv DRb::GWIdConv.new
+  #   gw = DRb::GW.new
+  #   s1 = DRb::DRbServer.new 'drbunix:/path/to/gateway', gw
+  #   s2 = DRb::DRbServer.new 'druby://example:10000', gw
+  #
+  #   s1.thread.join
+  #   s2.thread.join
+  #
+  # Each client must register services with the gateway, for example:
+  #
+  #   DRb.start_service 'drbunix:', nil # an anonymous server
+  #   gw = DRbObject.new nil, 'drbunix:/path/to/gateway'
+  #   gw[:unix] = some_service
+  #   DRb.thread.join
+
+  class GWIdConv < DRbIdConv
+    def to_obj(ref) # :nodoc:
+      if Array === ref && ref[0] == :DRbObject
+        return DRbObject.new_with(ref[1], ref[2])
+      end
+      super(ref)
+    end
+  end
+
+  # The GW provides a synchronized store for participants in the gateway to
+  # communicate.
+
+  class GW
+    include MonitorMixin
+
+    # Creates a new GW
+
+    def initialize
+      super()
+      @hash = {}
+    end
+
+    # Retrieves +key+ from the GW
+
+    def [](key)
+      synchronize do
+        @hash[key]
+      end
+    end
+
+    # Stores value +v+ at +key+ in the GW
+
+    def []=(key, v)
+      synchronize do
+        @hash[key] = v
+      end
+    end
+  end
+
+  class DRbObject # :nodoc:
+    def self._load(s)
+      uri, ref = Marshal.load(s)
+      if DRb.uri == uri
+        return ref ? DRb.to_obj(ref) : DRb.front
+      end
+
+      self.new_with(DRb.uri, [:DRbObject, uri, ref])
+    end
+
+    def _dump(lv)
+      if DRb.uri == @uri
+        if Array === @ref && @ref[0] == :DRbObject
+          Marshal.dump([@ref[1], @ref[2]])
+        else
+          Marshal.dump([@uri, @ref]) # ??
+        end
+      else
+        Marshal.dump([DRb.uri, [:DRbObject, @uri, @ref]])
+      end
+    end
+  end
+end
+
+=begin
+DRb.install_id_conv(DRb::GWIdConv.new)
+
+front = DRb::GW.new
+
+s1 = DRb::DRbServer.new('drbunix:/tmp/gw_b_a', front)
+s2 = DRb::DRbServer.new('drbunix:/tmp/gw_b_c', front)
+
+s1.thread.join
+s2.thread.join
+=end
+
+=begin
+# foo.rb
+
+require 'drb/drb'
+
+class Foo
+  include DRbUndumped
+  def initialize(name, peer=nil)
+    @name = name
+    @peer = peer
+  end
+
+  def ping(obj)
+    puts "#{@name}: ping: #{obj.inspect}"
+    @peer.ping(self) if @peer
+  end
+end
+=end
+
+=begin
+# gw_a.rb
+require 'drb/unix'
+require 'foo'
+
+obj = Foo.new('a')
+DRb.start_service("drbunix:/tmp/gw_a", obj)
+
+robj = DRbObject.new_with_uri('drbunix:/tmp/gw_b_a')
+robj[:a] = obj
+
+DRb.thread.join
+=end
+
+=begin
+# gw_c.rb
+require 'drb/unix'
+require 'foo'
+
+foo = Foo.new('c', nil)
+
+DRb.start_service("drbunix:/tmp/gw_c", nil)
+
+robj = DRbObject.new_with_uri("drbunix:/tmp/gw_b_c")
+
+puts "c->b"
+a = robj[:a]
+sleep 2
+
+a.ping(foo)
+
+DRb.thread.join
+=end
+
-- 
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