Some small things like, reorganizing imports, accessing static variables

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

diff --git a/source/mircoders/storage/DatabaseMessages.java b/source/mircoders/storage/DatabaseMessages.java
index 2c96902..7a9848b 100755 (executable)
--- a/source/mircoders/storage/DatabaseMessages.java
+++ b/source/mircoders/storage/DatabaseMessages.java
@@ -1,15 +1,39 @@
-package mircoders.storage;
-
-import java.lang.*;
-import java.sql.*;
-import java.io.*;
-import java.util.*;
+/*
+ * 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.
+ */
 
-import freemarker.template.*;
+package mircoders.storage;
 
-import mir.storage.*;
-import mir.entity.*;
-import mir.misc.*;
+import mir.log.LoggerWrapper;
+import mir.storage.Database;
+import mir.storage.StorageObject;
 
 
 /**
@@ -24,22 +48,27 @@ import mir.misc.*;
 
 public class DatabaseMessages extends Database implements StorageObject{
 
-       private static DatabaseMessages instance;
-
-       public static DatabaseMessages getInstance() throws StorageObjectException {
-               if (instance == null) {
-                       instance = new DatabaseMessages();
-                       instance.myselfDatabase = instance;
-               }
-               return instance;
-       }
-
-       private DatabaseMessages() throws StorageObjectException
-       {
-               super();
-               this.cache = new HashMap();
-               this.theTable="messages";
-       }
+  private static DatabaseMessages 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 DatabaseMessages getInstance() {
+    if (instance == null) {
+      instance = new DatabaseMessages();
+      instance.myselfDatabase = instance;
+    }
+    return instance;
+  }
+
+  private DatabaseMessages()
+  {
+    super();
+
+    logger = new LoggerWrapper("Database.Messages");
+
+    this.theTable="messages";
+  }
 
 
 }