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From "Kim Ebert (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CTAKES-151) LVG is not thread safe for multiple instances inside of a single JVM.
Date Tue, 02 Apr 2013 19:27:18 GMT

    [ https://issues.apache.org/jira/browse/CTAKES-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620159#comment-13620159
] 

Kim Ebert edited comment on CTAKES-151 at 4/2/13 7:26 PM:
----------------------------------------------------------

In my patch I convert the Out to be a local variable, but this still doesn't allow multiple
threads to do a read at the same time.

--- old/sources/gov/nih/nlm/nls/lvg/Api/LvgCmdApi.java  2013-01-09 23:10:44 +0000
+++ new/sources/gov/nih/nlm/nls/lvg/Api/LvgCmdApi.java  2013-01-10 01:05:39 +0000
@@ -43,6 +43,9 @@
 public class LvgCmdApi extends SystemOption
 {
     // public constructor
+
+       Out out = new Out();
+
     /**
     * Creates an LvgCmdApi object and initiate related data (default).
     * This constructor is consider as a preprocess method.
@@ -290,10 +304,10 @@
     */
     public String MutateToString(String inTerm) throws Exception
     {
-        Out.ResetOutString();
+       out.ResetOutString();
         // Process the mutation on the input term
         Process(inTerm, true);
-        return Out.GetOutString();
+        return out.GetOutString();
     }

=== modified file 'sources/gov/nih/nlm/nls/lvg/Util/Out.java'
--- old/sources/gov/nih/nlm/nls/lvg/Util/Out.java       2013-01-09 23:10:44 +0000
+++ new/sources/gov/nih/nlm/nls/lvg/Util/Out.java       2013-01-09 23:13:13 +0000
@@ -19,7 +19,7 @@
     * @param   msg  massage for printing out
     * @param   toStringFlag  a boolean flag for sending output to a String
     */
-    public static void Print(BufferedWriter outWriter, String msg,
+    public void Print(BufferedWriter outWriter, String msg,
         boolean fileOutput, boolean toStringFlag) throws IOException
     {
         if(toStringFlag == true)    // output to a String
@@ -50,7 +50,7 @@
     * @param   msg  massage for printing out
     * @param   toStringFlag  a boolean flag for sending output to a String
     */
-    public static void Println(BufferedWriter outWriter, String msg,
+    public void Println(BufferedWriter outWriter, String msg,
         boolean fileOutput, boolean toStringFlag) throws IOException
     {
         if(toStringFlag == true)    // output to a String
@@ -85,17 +85,17 @@
     /**
     * Reset the output string
     */
-    public static void ResetOutString()
+    public void ResetOutString()
     {
         outString_ = null;
     }
     /**
     * Get the output String
     */
-    public static String GetOutString()
+    public String GetOutString()
     {
         return outString_;
     }
     // data member
-    private static String outString_ = null;
+    private String outString_ = null;
 }

                
      was (Author: kim.ebert):
    In my patch I convert the Out to be a local variable, but this still doesn't allow multiple
threads to do a read at the same time.

--- old/sources/gov/nih/nlm/nls/lvg/Api/LvgCmdApi.java  2013-01-09 23:10:44 +0000
+++ new/sources/gov/nih/nlm/nls/lvg/Api/LvgCmdApi.java  2013-01-10 01:05:39 +0000
@@ -43,6 +43,9 @@
 public class LvgCmdApi extends SystemOption
 {
     // public constructor
+
+       Out out = new Out();
+
     /**
     * Creates an LvgCmdApi object and initiate related data (default).
     * This constructor is consider as a preprocess method.
@@ -290,10 +304,10 @@
     */
     public String MutateToString(String inTerm) throws Exception
     {
-        Out.ResetOutString();
+       out.ResetOutString();
         // Process the mutation on the input term
         Process(inTerm, true);
-        return Out.GetOutString();
+        return out.GetOutString();
     }


                  
> LVG is not thread safe for multiple instances inside of a single JVM.
> ---------------------------------------------------------------------
>
>                 Key: CTAKES-151
>                 URL: https://issues.apache.org/jira/browse/CTAKES-151
>             Project: cTAKES
>          Issue Type: Sub-task
>          Components: ctakes-lvg
>    Affects Versions: future enhancement, 3.0-incubating, 3.1-incubating
>            Reporter: Kim Ebert
>            Priority: Critical
>         Attachments: lvg_static_fix.patch
>
>
> The LVG library is not thread safe. It uses global variables, so between multiple instances,
the data will become corrupted.

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