From 8879baa96b917d81b39fee0c2e2cc9e5021865bc Mon Sep 17 00:00:00 2001
From: jprocter <jprocter@compbio.dundee.ac.uk>
Date: Tue, 27 Feb 2007 22:19:12 +0000
Subject: [PATCH] ensured single instance of vamsasarchive io handler to
 prevent lock contention.

git-svn-id: https://svn.lifesci.dundee.ac.uk/svn/repository/trunk@346 be28352e-c001-0410-b1a7-c7978e42abec
---
 .../ac/vamsas/client/simpleclient/SimpleClient.java   |   17 +++++++++--------
 .../ac/vamsas/client/simpleclient/VamsasSession.java  |   13 +++++++++++--
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/src/uk/ac/vamsas/client/simpleclient/SimpleClient.java b/src/uk/ac/vamsas/client/simpleclient/SimpleClient.java
index ad74209..677094c 100644
--- a/src/uk/ac/vamsas/client/simpleclient/SimpleClient.java
+++ b/src/uk/ac/vamsas/client/simpleclient/SimpleClient.java
@@ -321,20 +321,13 @@ public class SimpleClient implements IClient {
           _session.slog.warn("Session Document updated but may not be valid (false return from org.vamsas.simpleclient.ClientDocument.updateSessionDocument()");
         }
         log.debug("Document update successful.");
+        _session.setUnsavedFlag();
       }
       catch (IOException e) {
         log.warn("IO Problems when updating document!",e);
         _session.slog.error("IO problems when attempting to update document.");
       }
     }
-    try {
-      _session.setUnsavedFlag();
-      _session.unlockVamsasDocument();
-      evgen.enableDocumentWatch();
-    } catch (IOException e) {
-      log.warn("IO Problems when releasing lock on session document!",e);
-      _session.slog.error("IO problems when attempting to release lock on session document.");
-    }
     // garbage collect the ClientDocument instance.
     try {
       log.debug("Finalizing ClientDocument instance.");
@@ -343,6 +336,14 @@ public class SimpleClient implements IClient {
       log.error("Exception when trying to garbage collect ClientDocument for "+session.getSessionUrn(), e);
     }
     cdocument = null; // this is probably done by finalize
+
+    try {
+      _session.unlockVamsasDocument();
+      evgen.enableDocumentWatch();
+    } catch (IOException e) {
+      log.warn("IO Problems when releasing lock on session document!",e);
+      _session.slog.error("IO problems when attempting to release lock on session document.");
+    }
   }
   
   /*
diff --git a/src/uk/ac/vamsas/client/simpleclient/VamsasSession.java b/src/uk/ac/vamsas/client/simpleclient/VamsasSession.java
index c849893..05014ab 100644
--- a/src/uk/ac/vamsas/client/simpleclient/VamsasSession.java
+++ b/src/uk/ac/vamsas/client/simpleclient/VamsasSession.java
@@ -294,7 +294,10 @@ public class VamsasSession {
     newdoc.unlockFile();
     log.debug("Transfer complete.");
   }
-  
+  /**
+	 * extant archive IO handler
+	 */
+  VamsasArchive _va=null;
   /**
    * Creates a VamsasArchive Vobject for accessing and updating document
    * Note: this will lock the Vamsas Document for exclusive access to the client.
@@ -302,7 +305,9 @@ public class VamsasSession {
    * @throws IOException if locks fail or vamsas document read fails.
    */
   protected VamsasArchive getVamsasDocument() throws IOException {
-    // TODO: check we haven't already done this once - probably should be done by caller
+    // check we haven't already done this once - probably should be done by caller
+    if (_va!=null)
+      return _va;
     // patiently wait for a lock on the document. (from ArchiveClient.getUpdateable())
     long tries=5000;
     while (vamArchive.getLock()==null && --tries>0) {
@@ -321,8 +326,12 @@ public class VamsasSession {
    * @throws IOException
    */
   protected void unlockVamsasDocument() throws IOException {
+    if (_va!=null)
+      _va.closeArchive();
+    _va=null;
     if (vamArchive!=null)
       vamArchive.unLock();
+    
   }
   /**
    * create a uniquely named uk.ac.vamsas.client.simpleclient.ClientsFile.addClient(ClientHandle)ile in the session Directory
-- 
1.7.10.2