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bin/gems/sass-embedded-1.83.4-x86_64-linux-gnu/lib/sass/compiler/dispatcher.rb

@@ -0,0 +1,116 @@
+# frozen_string_literal: true
+
+module Sass
+  class Compiler
+    # The {Dispatcher} class.
+    #
+    # It dispatches messages between multiple instances of {Host} and a single {Connection} to the compiler.
+    class Dispatcher
+      def initialize
+        @id = 1
+        @observers = {}.compare_by_identity
+        @mutex = Mutex.new
+        @connection = Connection.new
+        @connection.listen(self)
+        ForkTracker.add(self)
+      end
+
+      def subscribe(observer)
+        @mutex.synchronize do
+          raise Errno::EBUSY if _closed?
+
+          id = @id
+          @id = id.next
+          @observers[id] = observer
+          id
+        end
+      end
+
+      def unsubscribe(id)
+        @mutex.synchronize do
+          @observers.delete(id)
+
+          return unless @observers.empty?
+
+          if _closed?
+            Thread.new do
+              close
+            end
+          else
+            _idle
+          end
+        end
+      end
+
+      def close
+        @mutex.synchronize do
+          _close
+        end
+        @connection.close
+        ForkTracker.delete(self)
+      end
+
+      def closed?
+        @connection.closed?
+      end
+
+      def error(error)
+        observers = @mutex.synchronize do
+          _close
+          @observers.values
+        end
+
+        if observers.empty?
+          close
+        else
+          observers.each do |observer|
+            observer.error(error)
+          end
+        end
+      end
+
+      def receive_proto(id, proto)
+        case id
+        when 1...0xffffffff
+          @mutex.synchronize { @observers[id] }&.receive_proto(proto)
+        when 0
+          outbound_message = EmbeddedProtocol::OutboundMessage.decode(proto)
+          oneof = outbound_message.message
+          message = outbound_message.public_send(oneof)
+          @mutex.synchronize { @observers[message.id] }&.public_send(oneof, message)
+        when 0xffffffff
+          outbound_message = EmbeddedProtocol::OutboundMessage.decode(proto)
+          oneof = outbound_message.message
+          message = outbound_message.public_send(oneof)
+          raise Errno::EPROTO, message.message
+        else
+          raise Errno::EPROTO
+        end
+      end
+
+      def send_proto(...)
+        @connection.write(...)
+      end
+
+      private
+
+      def _close
+        @id = 0xffffffff
+      end
+
+      def _closed?
+        @id == 0xffffffff
+      end
+
+      def _idle
+        @id = 1
+      end
+
+      def _idle?
+        @id == 1
+      end
+    end
+
+    private_constant :Dispatcher
+  end
+end