From: cvs <cvs>
Date: Mon, 8 Apr 2002 17:50:39 +0000 (+0000)
Subject: forgot to synchronize some more DB instances
X-Git-Tag: prexmlproducerconfig~131
X-Git-Url: http://erislabs.org.uk/gitweb/?a=commitdiff_plain;h=d0c46424c8165575cb388e0f5812b24e2d1b8081;p=mir.git

forgot to synchronize some more DB instances
---

diff --git a/source/mircoders/storage/DatabaseContent.java b/source/mircoders/storage/DatabaseContent.java
index f4301bad..08b407e8 100755
--- a/source/mircoders/storage/DatabaseContent.java
+++ b/source/mircoders/storage/DatabaseContent.java
@@ -27,7 +27,10 @@ public class DatabaseContent extends Database implements StorageObject {
 
   // Contructors / Singleton
 
-  public static DatabaseContent getInstance()
+  // 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 DatabaseContent getInstance()
     throws StorageObjectException {
 
     if (instance == null ) {
diff --git a/source/mircoders/storage/DatabaseContentToMedia.java b/source/mircoders/storage/DatabaseContentToMedia.java
index 90854d72..5807ea5b 100755
--- a/source/mircoders/storage/DatabaseContentToMedia.java
+++ b/source/mircoders/storage/DatabaseContentToMedia.java
@@ -23,7 +23,10 @@ public class DatabaseContentToMedia extends Database implements StorageObject{
 
   private static DatabaseContentToMedia instance;
 
-  public static DatabaseContentToMedia getInstance()
+  // 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 DatabaseContentToMedia getInstance()
     throws StorageObjectException {
     if (instance == null) {
       instance = new DatabaseContentToMedia();
diff --git a/source/mircoders/storage/DatabaseContentToTopics.java b/source/mircoders/storage/DatabaseContentToTopics.java
index 8fb8a9ea..dc76e9d9 100755
--- a/source/mircoders/storage/DatabaseContentToTopics.java
+++ b/source/mircoders/storage/DatabaseContentToTopics.java
@@ -23,7 +23,10 @@ public class DatabaseContentToTopics extends Database implements StorageObject{
 
   private static DatabaseContentToTopics instance;
 
-  public static DatabaseContentToTopics getInstance()
+  // 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 DatabaseContentToTopics getInstance()
     throws StorageObjectException {
     if (instance == null) {
       instance = new DatabaseContentToTopics();