Mir goes GPL

[mir.git] / source / mircoders / storage / DatabaseBreaking.java

diff --git a/source/mircoders/storage/DatabaseBreaking.java b/source/mircoders/storage/DatabaseBreaking.java
index 2a9ad58..97959eb 100755 (executable)
--- a/source/mircoders/storage/DatabaseBreaking.java
+++ b/source/mircoders/storage/DatabaseBreaking.java
@@ -1,3 +1,34 @@
+/*
+ * Copyright (C) 2001, 2002  The Mir-coders group
+ *
+ * This file is part of Mir.
+ *
+ * Mir is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Mir 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mir; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * In addition, as a special exception, The Mir-coders gives permission to link
+ * the code of this program with the com.oreilly.servlet library, any library
+ * licensed under the Apache Software License, The Sun (tm) Java Advanced
+ * Imaging library (JAI), The Sun JIMI library (or with modified versions of
+ * the above that use the same license as the above), and distribute linked
+ * combinations including the two.  You must obey the GNU General Public
+ * License in all respects for all of the code used other than the above
+ * mentioned libraries.  If you modify this file, you may extend this exception
+ * to your version of the file, but you are not obligated to do so.  If you do
+ * not wish to do so, delete this exception statement from your version.
+ */
+
 package mircoders.storage;
 
 import java.lang.*;
@@ -19,26 +50,30 @@ import mir.misc.*;
 
 public class DatabaseBreaking extends Database implements StorageObject{
 
-       private static DatabaseBreaking instance;
-
-       public static DatabaseBreaking getInstance() throws StorageObjectException {
-               if (instance == null) {
-                       instance = new DatabaseBreaking();
-                       instance.myselfDatabase = instance;
-               }
-               return instance;
-       }
-
-       private DatabaseBreaking() throws StorageObjectException
-       {
-               super();
-               this.cache = new HashMap();
-               this.theTable="breaking";
-               try {
-                       this.theEntityClass = Class.forName("mir.entity.EntityBreaking");
-               }
-               catch (Exception e) { throw new StorageObjectException(e.toString());   }
-       }
+  private static DatabaseBreaking instance;
+
+  // the following *has* to be sychronized cause this static method
+  // could get preemted and we could end up with 2 instances of DatabaseFoo..
+  // see the "Singletons with needles and thread" article at JavaWorld -mh
+  public synchronized static DatabaseBreaking getInstance() 
+    throws StorageObjectException {
+    if (instance == null) {
+      instance = new DatabaseBreaking();
+      instance.myselfDatabase = instance;
+    }
+    return instance;
+  }
+
+  private DatabaseBreaking() throws StorageObjectException
+  {
+    super();
+    //this.cache = new DatabaseCache(4);
+    this.theTable="breaking";
+    try {
+      this.theEntityClass = Class.forName("mircoders.entity.EntityBreaking");
+    }
+    catch (Exception e) { throw new StorageObjectException(e.toString()); }
+  }
 
 
 }