start background splitter work

SConstruct

@@ -469,7 +469,7 @@ coreServerFiles += scriptingFiles
 
 coreShardFiles = [ "s/config.cpp" , "s/grid.cpp" , "s/chunk.cpp" , "s/shard.cpp" , "s/shardkey.cpp" ]
 shardServerFiles = coreShardFiles + Glob( "s/strategy*.cpp" ) + [ "s/commands_admin.cpp" , "s/commands_public.cpp" , "s/request.cpp" ,  "s/cursors.cpp" ,  "s/server.cpp" , "s/config_migrate.cpp" , "s/s_only.cpp" , "s/stats.cpp" , "s/balance.cpp" , "s/balancer_policy.cpp" , "db/cmdline.cpp" , "s/writeback_listener.cpp" , "s/shard_version.cpp" ]
-serverOnlyFiles += coreShardFiles + [ "s/d_logic.cpp" , "s/d_writeback.cpp" , "s/d_migrate.cpp" , "s/d_state.cpp" , "s/d_split.cpp" , "client/distlock_test.cpp" ]
+serverOnlyFiles += coreShardFiles + [ "s/d_logic.cpp" , "s/d_writeback.cpp" , "s/d_migrate.cpp" , "s/d_state.cpp" , "s/d_split.cpp" , "client/distlock_test.cpp" , "s/d_background_splitter.cpp" ]
 
 serverOnlyFiles += [ "db/module.cpp" ] + Glob( "db/modules/*.cpp" )
 

s/d_background_splitter.cpp

@@ -0,0 +1,36 @@
+// @file d_background_splitter.cpp
+
+/**
+*    Copyright (C) 2010 10gen Inc.
+*
+*    This program is free software: you can redistribute it and/or  modify
+*    it under the terms of the GNU Affero General Public License, version 3,
+*    as published by the Free Software Foundation.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU Affero General Public License for more details.
+*
+*    You should have received a copy of the GNU Affero General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pch.h"
+
+#include "../util/time_support.h"
+
+#include "d_background_splitter.h"
+
+namespace mongo {
+
+void Splitter::run() {
+    while ( ! inShutdown() ) {
+
+        log() << "splitter not implemented yet" << endl;
+
+        sleepsecs(60);
+    }
+}
+
+} // namespace mongo

s/d_background_splitter.h

@@ -0,0 +1,44 @@
+// @file d_background_splitter.h
+
+/**
+*    Copyright (C) 2010 10gen Inc.
+*
+*    This program is free software: you can redistribute it and/or  modify
+*    it under the terms of the GNU Affero General Public License, version 3,
+*    as published by the Free Software Foundation.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU Affero General Public License for more details.
+*
+*    You should have received a copy of the GNU Affero General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "../pch.h"
+
+#include "../util/background.h"
+
+namespace mongo {
+
+    /**
+     * Traverses continuously this shard's chunk and splits the ones that are above the 
+     * maximum desired size
+     */
+    class Splitter : public BackgroundJob {
+    public:
+        Splitter();
+        virtual ~Splitter();
+
+        // BackgroundJob methods
+
+        virtual void run();
+
+        virtual string name() const { return "BackgroundSplitter"; }
+    };
+
+} // namespace mongo    
+