From 4fa2a3baef3b39cdc96cf2fdaae64a9d457573e6 Mon Sep 17 00:00:00 2001
From: moitoius_cp <7bd20ad30720b36bd251fb928c419f8754d57bfcCkJyHhZD>
Date: Tue, 1 Jan 2008 12:43:47 +0000
Subject: [PATCH] made a simple staging system

---
 .../Cosmos/Cosmos.Kernel/Cosmos.Kernel.csproj |  6 +-
 .../Staging/DefaultStageQueue.cs              | 11 ++++
 source/Cosmos/Cosmos.Kernel/Staging/IStage.cs | 27 +++++++++
 .../Cosmos.Kernel/Staging/StageQueue.cs       | 59 +++++++++++++++++++
 4 files changed, 100 insertions(+), 3 deletions(-)
 create mode 100644 source/Cosmos/Cosmos.Kernel/Staging/DefaultStageQueue.cs
 create mode 100644 source/Cosmos/Cosmos.Kernel/Staging/IStage.cs
 create mode 100644 source/Cosmos/Cosmos.Kernel/Staging/StageQueue.cs

diff --git a/source/Cosmos/Cosmos.Kernel/Cosmos.Kernel.csproj b/source/Cosmos/Cosmos.Kernel/Cosmos.Kernel.csproj
index 3578b7c83..d45813210 100644
--- a/source/Cosmos/Cosmos.Kernel/Cosmos.Kernel.csproj
+++ b/source/Cosmos/Cosmos.Kernel/Cosmos.Kernel.csproj
@@ -67,9 +67,9 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="FileSystem\Ext2.Structs.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Staging\" />
+    <Compile Include="Staging\DefaultStageQueue.cs" />
+    <Compile Include="Staging\IStage.cs" />
+    <Compile Include="Staging\StageQueue.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/source/Cosmos/Cosmos.Kernel/Staging/DefaultStageQueue.cs b/source/Cosmos/Cosmos.Kernel/Staging/DefaultStageQueue.cs
new file mode 100644
index 000000000..f6989d888
--- /dev/null
+++ b/source/Cosmos/Cosmos.Kernel/Staging/DefaultStageQueue.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Cosmos.Kernel.Staging {
+        public class DefaultStageQueue : StageQueue {
+                public DefaultStageQueue() : base() {
+                        
+                }
+        }
+}
diff --git a/source/Cosmos/Cosmos.Kernel/Staging/IStage.cs b/source/Cosmos/Cosmos.Kernel/Staging/IStage.cs
new file mode 100644
index 000000000..78178f292
--- /dev/null
+++ b/source/Cosmos/Cosmos.Kernel/Staging/IStage.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Cosmos.Kernel.Staging {
+        /// <summary>
+        /// Represents a kernel stage.
+        /// </summary>
+        public interface IStage {
+                /// <summary>
+                /// Gets the name of the stage.
+                /// </summary>
+                string Name {
+                        get;
+                }
+
+                /// <summary>
+                /// Initializes the stage.
+                /// </summary>
+                void Initialize();
+
+                /// <summary>
+                /// Tears the stage down.
+                /// </summary>
+                void Teardown();
+        }
+}
diff --git a/source/Cosmos/Cosmos.Kernel/Staging/StageQueue.cs b/source/Cosmos/Cosmos.Kernel/Staging/StageQueue.cs
new file mode 100644
index 000000000..ee22a27cd
--- /dev/null
+++ b/source/Cosmos/Cosmos.Kernel/Staging/StageQueue.cs
@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Cosmos.Kernel.Staging {
+        /// <summary>
+        /// Represents a stage queue.
+        /// </summary>
+        public class StageQueue {
+                /// <summary>
+                /// The list of initialize stages.
+                /// </summary>
+                private Queue<IStage> _initialize = new Queue<IStage> ();
+
+                /// <summary>
+                /// The list of teardown stages.
+                /// </summary>
+                private Queue<IStage> _teardown = new Queue<IStage> ();
+
+                private IStage _current;
+                /// <summary>
+                /// Gets the current kernel stage.
+                /// </summary>
+                public IStage Current {
+                        get {
+                                return _current;
+                        }
+                }
+
+                /// <summary>
+                /// Enqueues a stage.
+                /// </summary>
+                /// <param name="stage"></param>
+                public void Enqueue(IStage stage) {
+                        _initialize.Enqueue (stage);
+                }
+
+                /// <summary>
+                /// Runs the tasks.
+                /// </summary>
+                public void Run() {
+                        while (_initialize.Count != 0) {
+                                _current = _initialize.Dequeue ();
+                                _current.Initialize ();
+                                _teardown.Enqueue (_current);
+                        }
+                }
+
+                /// <summary>
+                /// Runs the teardown.
+                /// </summary>
+                public void Teardown() {
+                        while (_teardown.Count != 0) {
+                                _current = _teardown.Dequeue ();
+                                _current.Teardown ();
+                        }
+                }
+        }
+}