From d8f0ca3bdf783b00ea7360eed51bd49f5e8a7f8b Mon Sep 17 00:00:00 2001
From: Doug MacEachern <dougm@hyperic.com>
Date: Mon, 28 Feb 2005 00:31:41 +0000
Subject: [PATCH] only create one instance

---
 .../net/hyperic/sigar/OperatingSystem.java    | 26 ++++++++++++-------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/bindings/java/src/net/hyperic/sigar/OperatingSystem.java b/bindings/java/src/net/hyperic/sigar/OperatingSystem.java
index 85e8fcdc..813b7161 100644
--- a/bindings/java/src/net/hyperic/sigar/OperatingSystem.java
+++ b/bindings/java/src/net/hyperic/sigar/OperatingSystem.java
@@ -13,6 +13,8 @@ public class OperatingSystem {
     private static final String ETC =
         System.getProperty("sigar.etc.dir", "/etc") + "/";
 
+    private static OperatingSystem instance = null;
+
     private String name;
     private String version;
     private String arch;
@@ -23,19 +25,23 @@ public class OperatingSystem {
     private OperatingSystem() {
     }
 
-    public static OperatingSystem getInstance() {
-        OperatingSystem os = new OperatingSystem();
-        Properties props = System.getProperties();
-        os.name = props.getProperty("os.name");
-        os.version = props.getProperty("os.version");
-        os.arch = props.getProperty("os.arch");
-        os.patchLevel = props.getProperty("sun.os.patch.level");
+    public static synchronized OperatingSystem getInstance() {
+        if (instance == null) {
+            OperatingSystem os = new OperatingSystem();
+            Properties props = System.getProperties();
+            os.name = props.getProperty("os.name");
+            os.version = props.getProperty("os.version");
+            os.arch = props.getProperty("os.arch");
+            os.patchLevel = props.getProperty("sun.os.patch.level");
 
-        if (os.name.equals("Linux")) {
-            os.getLinuxInfo();
+            if (os.name.equals("Linux")) {
+                os.getLinuxInfo();
+            }
+
+            instance = os;
         }
 
-        return os;
+        return instance;
     }
 
     public String getName() {