Added a mechanism to perform a bulk change without intermediate save().

This allows us to define more setter methods on configuration values, which in turn improves the ability to make programatic changes to the configuration, which in turn improves testability.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11515 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/ProxyConfiguration.java

@@ -2,6 +2,7 @@ package hudson;
 
 import com.thoughtworks.xstream.XStream;
 import hudson.model.Hudson;
+import hudson.model.Saveable;
 import hudson.util.XStream2;
 import hudson.util.Scrambler;
 
@@ -20,7 +21,7 @@ import java.net.URL;
  *
  * @see Hudson#proxy
  */
-public final class ProxyConfiguration {
+public final class ProxyConfiguration implements Saveable {
     public final String name;
     public final int port;
 
@@ -54,6 +55,7 @@ public final class ProxyConfiguration {
     }
 
     public void save() throws IOException {
+        if(BulkChange.contains(this))   return;
         getXmlFile().write(this);
     }