convenience method to access connection pool info

Author: agirbal

src/main/com/mongodb/DBPortPool.java

@@ -29,7 +29,7 @@
 import java.lang.management.*;
 import javax.management.*;
 
-class DBPortPool extends SimplePool<DBPort> {
+public class DBPortPool extends SimplePool<DBPort> {
 
     static class Holder {
 

src/main/com/mongodb/DBTCPConnector.java

@@ -25,7 +25,7 @@
 
 import org.bson.*;
 
-class DBTCPConnector implements DBConnector {
+public class DBTCPConnector implements DBConnector {
 
     static Logger _logger = Logger.getLogger( Bytes.LOGGER.getName() + ".tcp" );
     static Logger _createLogger = Logger.getLogger( _logger.getName() + ".connect" );
@@ -445,11 +445,26 @@ public void close(){
         _myPort = null;
     }
 
-    void updatePortPool(ServerAddress addr) {
+    /**
+     * Assigns a new DBPortPool for a given ServerAddress.
+     * This is used to obtain a new pool when the resolved IP of a host changes, for example.
+     * User application should not have to call this method directly.
+     * @param addr
+     */
+    public void updatePortPool(ServerAddress addr) {
         // just remove from map, a new pool will be created lazily
         _portHolder._pools.remove(addr);
     }
 
+    /**
+     * Gets the DBPortPool associated with a ServerAddress.
+     * @param addr
+     * @return
+     */
+    public DBPortPool getDBPortPool(ServerAddress addr) {
+        return _portHolder.get(addr);
+    }
+
     public boolean isOpen(){
         return ! _closed;
     }

src/main/com/mongodb/Mongo.java

@@ -399,7 +399,7 @@ public String getConnectPoint(){
      * Gets the underlying TCP connector
      * @return
      */
-    DBTCPConnector getConnector() {
+    public DBTCPConnector getConnector() {
         return _connector;
     }