From dfe0cff3084d638892f30d7a880c4fc9947d5f9f Mon Sep 17 00:00:00 2001
From: Eliot Horowitz <eliot@10gen.com>
Date: Fri, 27 Feb 2009 12:51:49 -0500
Subject: [PATCH] lastmod

---
 s/shard.cpp | 25 ++++++++++++++++++-------
 s/shard.h   |  8 ++++++--
 2 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/s/shard.cpp b/s/shard.cpp
index 46dfbd5b9e5..0924cf6e5d3 100644
--- a/s/shard.cpp
+++ b/s/shard.cpp
@@ -32,7 +32,7 @@ namespace mongo {
 
     void Shard::setServer( string s ){
         _server = s;
-        _modified = true;
+        _markModified();
     }
     
     bool Shard::contains( const BSONObj& obj ){
@@ -54,9 +54,9 @@ namespace mongo {
         s->_min = m.getOwned();
         s->_max = _max;
         
-        s->_modified = true;
-        _modified = true;
-
+        s->_markModified();
+        _markModified();
+        
         _manager->_shards.push_back( s );
         
         _max = m.getOwned(); 
@@ -74,19 +74,22 @@ namespace mongo {
     void Shard::getFilter( BSONObjBuilder& b ){
         _manager->_key.getFilter( b , _min , _max );
     }
-
+    
     void Shard::serialize(BSONObjBuilder& to){
         to << "ns" << _ns;
         to << "min" << _min;
         to << "max" << _max;
         to << "server" << _server;
+        if ( _lastmod )
+            to.appendDate( "lastmod" , _lastmod );
     }
-
+    
     void Shard::unserialize(const BSONObj& from){
         _ns = from.getStringField( "ns" );
         _min = from.getObjectField( "min" ).getOwned();
         _max = from.getObjectField( "max" ).getOwned();
         _server = from.getStringField( "server" );
+        _lastmod = from.hasField( "lastmod" ) ? from["lastmod"].date() : 0;
         
         uassert( "Shard needs a ns" , ! _ns.empty() );
         uassert( "Shard needs a server" , ! _ns.empty() );
@@ -100,6 +103,14 @@ namespace mongo {
         return configServer.modelServer();
     }
     
+    void Shard::_markModified(){
+        _modified = true;
+
+        unsigned long long t = time(0);
+        t *= 1000;
+        _lastmod = t;
+    }
+
     string Shard::toString() const {
         stringstream ss;
         ss << "shard  ns:" << _ns << " server: " << _server << " min: " << _min << " max: " << _max;
@@ -127,7 +138,7 @@ namespace mongo {
             s->_min = _key.globalMin();
             s->_max = _key.globalMax();
             s->_server = config->getPrimary();
-            s->_modified = true;
+            s->_markModified();
 
             _shards.push_back( s );
 
diff --git a/s/shard.h b/s/shard.h
index 09f12e8fb32..3b5a1343bcb 100644
--- a/s/shard.h
+++ b/s/shard.h
@@ -79,15 +79,19 @@ namespace mongo {
         Shard( ShardManager * info );
         
     private:
+        
+        void _markModified();
+
         ShardManager * _manager;
         
         string _ns;
         BSONObj _min;
         BSONObj _max;
         string _server;
-        
-        bool _modified;
+        unsigned long long _lastmod;
 
+        bool _modified;
+        
         void _split( BSONObj& middle );
 
         friend class ShardManager;