线程安全问题

designer-base/src/com/fr/design/mainframe/DesignerFrameFileDealerPane.java

@@ -53,7 +53,7 @@ public class DesignerFrameFileDealerPane extends JPanel implements FileToolbarSt
     
     private static final String FILE = "file";
     
-    private static DesignerFrameFileDealerPane THIS;
+    private static volatile DesignerFrameFileDealerPane THIS;
     
     private CardLayout card;
     
@@ -84,9 +84,13 @@ public class DesignerFrameFileDealerPane extends JPanel implements FileToolbarSt
 
     public static final DesignerFrameFileDealerPane getInstance() {
 
+        if (THIS == null) {
+            synchronized (DesignerFrameFileDealerPane.class) {
                 if (THIS == null) {
                     THIS = new DesignerFrameFileDealerPane();
                 }
+            }
+        }
         return THIS;
     }
     

designer-base/src/com/fr/design/mainframe/EastRegionContainerPane.java

@@ -30,7 +30,7 @@ import java.util.Map;
 import java.util.Set;
 
 public class EastRegionContainerPane extends UIEastResizableContainer {
-    private static EastRegionContainerPane THIS;
+    private static volatile EastRegionContainerPane THIS;
     private Map<String, PropertyItem> propertyItemMap;
     private CardLayout propertyCard;
     private JPanel leftPane;
@@ -83,14 +83,18 @@ public class EastRegionContainerPane extends UIEastResizableContainer {
      * @return
      */
     public static EastRegionContainerPane getInstance() {
+        if (THIS == null) {
+            synchronized (EastRegionContainerPane.class) {
                 if (THIS == null) {
                     THIS = new EastRegionContainerPane();
                     THIS.setLastContainerWidth(DesignerEnvManager.getEnvManager().getLastEastRegionContainerWidth());
                 }
+            }
+        }
         return THIS;
     }
 
-    public EastRegionContainerPane() {
+    private EastRegionContainerPane() {
         super();
         initPropertyItemList();
         defaultPane = getDefaultPane(Inter.getLocText("FR-Designer_No_Settings_Available"));

designer-realize/src/com/fr/design/mainframe/CellElementPropertyPane.java

@@ -68,13 +68,17 @@ public class CellElementPropertyPane extends DockingView {
 
 
     public synchronized static CellElementPropertyPane getInstance() {
+        if (singleton == null) {
+            synchronized (CellElementPropertyPane.class) {
                 if (singleton == null) {
                     singleton = new CellElementPropertyPane();
                 }
+            }
+        }
         return singleton;
     }
 
-    private static CellElementPropertyPane singleton;
+    private static volatile CellElementPropertyPane singleton;
 
     private CellElementEditPane cellElementEditPane;