transferred Code Ocean from original repository to GitHub

lib/port_pool.rb

@@ -0,0 +1,16 @@
+class PortPool
+  PORT_RANGE = DockerClient.config[:ports]
+
+  @available_ports = PORT_RANGE.to_a
+  @mutex = Mutex.new
+
+  def self.available_port
+    @mutex.synchronize do
+      @available_ports.delete(@available_ports.sample)
+    end
+  end
+
+  def self.release(port)
+    @available_ports << port if PORT_RANGE.include?(port) && !@available_ports.include?(port)
+  end
+end