Fresh start

1 files changed, 93 insertions, 0 deletions

diff --git a/jni/ruby/lib/drb/extservm.rb b/jni/ruby/lib/drb/extservm.rb
new file mode 100644
index 0000000..8a7fc31
--- /dev/null
+++ b/jni/ruby/lib/drb/extservm.rb
@@ -0,0 +1,93 @@
+=begin
+ external service manager
+        Copyright (c) 2000 Masatoshi SEKI
+=end
+
+require 'drb/drb'
+require 'thread'
+require 'monitor'
+
+module DRb
+  class ExtServManager
+    include DRbUndumped
+    include MonitorMixin
+
+    @@command = {}
+
+    def self.command
+      @@command
+    end
+
+    def self.command=(cmd)
+      @@command = cmd
+    end
+
+    def initialize
+      super()
+      @cond = new_cond
+      @servers = {}
+      @waiting = []
+      @queue = Queue.new
+      @thread = invoke_thread
+      @uri = nil
+    end
+    attr_accessor :uri
+
+    def service(name)
+      synchronize do
+        while true
+          server = @servers[name]
+          return server if server && server.alive?
+          invoke_service(name)
+          @cond.wait
+        end
+      end
+    end
+
+    def regist(name, ro)
+      synchronize do
+        @servers[name] = ro
+        @cond.signal
+      end
+      self
+    end
+
+    def unregist(name)
+      synchronize do
+        @servers.delete(name)
+      end
+    end
+
+    private
+    def invoke_thread
+      Thread.new do
+        while true
+          name = @queue.pop
+          invoke_service_command(name, @@command[name])
+        end
+      end
+    end
+
+    def invoke_service(name)
+      @queue.push(name)
+    end
+
+    def invoke_service_command(name, command)
+      raise "invalid command. name: #{name}" unless command
+      synchronize do
+        return if @servers.include?(name)
+        @servers[name] = false
+      end
+      uri = @uri || DRb.uri
+      if command.respond_to? :to_ary
+        command = command.to_ary + [uri, name]
+        pid = spawn(*command)
+      else
+        pid = spawn("#{command} #{uri} #{name}")
+      end
+      th = Process.detach(pid)
+      th[:drb_service] = name
+      th
+    end
+  end
+end