[Techne-dev-commit] SF.net SVN: techne-dev: [85] sandbox/rickles/org.digivitality.techne.core/ src/org/digivitality/techne/core/ContainerFactory.java

[<to...@us...>]

Revision: 85
          http://techne-dev.svn.sourceforge.net/techne-dev/?rev=85&view=rev
Author:   tonit
Date:     2007-02-27 11:10:48 -0800 (Tue, 27 Feb 2007)

Log Message:
-----------
added doublecheck locking

Modified Paths:
--------------
    sandbox/rickles/org.digivitality.techne.core/src/org/digivitality/techne/core/ContainerFactory.java

Modified: sandbox/rickles/org.digivitality.techne.core/src/org/digivitality/techne/core/ContainerFactory.java
===================================================================
--- sandbox/rickles/org.digivitality.techne.core/src/org/digivitality/techne/core/ContainerFactory.java	2007-02-27 18:59:06 UTC (rev 84)
+++ sandbox/rickles/org.digivitality.techne.core/src/org/digivitality/techne/core/ContainerFactory.java	2007-02-27 19:10:48 UTC (rev 85)
@@ -1,8 +1,8 @@
 package org.digivitality.techne.core;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
 
-
 public class ContainerFactory {
 
 	// this will be replaced by techne.properties
@@ -10,42 +10,46 @@
 	private int quantity;
 	private List containerInstances = new ArrayList();
 	private static ContainerFactory instance;
-	
+
 	private ContainerFactory() {
-		
+
 	}
-	
-	public Object clone() throws CloneNotSupportedException
-    {
-        throw new CloneNotSupportedException("Cloning a singleton is not allowed."); 
-    }
-	
-	static synchronized public ContainerFactory getInstance() 
-	{
-		if (instance==null) {
-			instance = new ContainerFactory();
+
+	public Object clone() throws CloneNotSupportedException {
+		throw new CloneNotSupportedException(
+				"Cloning a singleton is not allowed.");
+	}
+
+	static synchronized public ContainerFactory getInstance() {
+		if (instance == null) {
+			synchronized (ContainerFactory.class) {
+				if (instance == null) {
+					instance = new ContainerFactory();
+				}
+			}
 		}
-	    return instance;
+
+		return instance;
 	}
-	
+
 	public void init() {
 		if (quantity == 0) {
 			quantity = DEFAULT_QUANTITY;
 		}
-		for (int i = 0; i < quantity; i++ ) {
+		for (int i = 0; i < quantity; i++) {
 			containerInstances.add(new ContainerIntanceImpl());
 		}
 	}
-	
+
 	public void setQuantity(int parm) {
 		this.quantity = parm;
 	}
-	
+
 	public int getQuantity() {
 		return containerInstances.size();
 	}
-	
+
 	public List getContainerInstances() {
-	    return containerInstances;	
+		return containerInstances;
 	}
 }


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