From fd69619118c808b2c30af3dbb4a9882f192237b3 Mon Sep 17 00:00:00 2001
From: Gordon Sim <gsim@apache.org>
Date: Tue, 7 Nov 2006 16:58:31 +0000
Subject: Modified TransactionalStore to return the txn ctxt as an auto_ptr to
 make ownership more obvious.

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@472166 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/broker/NullMessageStore.cpp |  4 ++--
 cpp/src/qpid/broker/NullMessageStore.h   |  2 +-
 cpp/src/qpid/broker/TransactionalStore.h |  6 +++++-
 cpp/src/qpid/broker/TxBuffer.cpp         | 20 ++++++++++++--------
 4 files changed, 20 insertions(+), 12 deletions(-)

(limited to 'cpp/src/qpid')

diff --git a/cpp/src/qpid/broker/NullMessageStore.cpp b/cpp/src/qpid/broker/NullMessageStore.cpp
index 3a07961670..87df407ad8 100644
--- a/cpp/src/qpid/broker/NullMessageStore.cpp
+++ b/cpp/src/qpid/broker/NullMessageStore.cpp
@@ -46,8 +46,8 @@ void NullMessageStore::committed(const string * const){
 void NullMessageStore::aborted(const string * const){
     std::cout << "WARNING: Persistence not enabled." << std::endl;
 }
-TransactionContext* NullMessageStore::begin(){
-    return 0;
+std::auto_ptr<TransactionContext> NullMessageStore::begin(){
+    return std::auto_ptr<TransactionContext>();
 }
 void NullMessageStore::commit(TransactionContext*){
 }
diff --git a/cpp/src/qpid/broker/NullMessageStore.h b/cpp/src/qpid/broker/NullMessageStore.h
index 9b89920416..3b34a7f6a0 100644
--- a/cpp/src/qpid/broker/NullMessageStore.h
+++ b/cpp/src/qpid/broker/NullMessageStore.h
@@ -39,7 +39,7 @@ namespace qpid {
             void dequeue(TransactionContext* ctxt, Message::shared_ptr& msg, const Queue& queue, const string * const xid);
             void committed(const string * const xid);
             void aborted(const string * const xid);
-            TransactionContext* begin();
+            std::auto_ptr<TransactionContext> begin();
             void commit(TransactionContext* ctxt);
             void abort(TransactionContext* ctxt);
             ~NullMessageStore(){}
diff --git a/cpp/src/qpid/broker/TransactionalStore.h b/cpp/src/qpid/broker/TransactionalStore.h
index 57dc411cd8..f11c5de31b 100644
--- a/cpp/src/qpid/broker/TransactionalStore.h
+++ b/cpp/src/qpid/broker/TransactionalStore.h
@@ -18,8 +18,12 @@
 #ifndef _TransactionalStore_
 #define _TransactionalStore_
 
+#include <memory>
+
 namespace qpid {
     namespace broker {
+        struct InvalidTransactionContextException : public std::exception {};
+
         class TransactionContext{
         public:
             virtual ~TransactionContext(){}
@@ -27,7 +31,7 @@ namespace qpid {
 
         class TransactionalStore{
         public:
-            virtual TransactionContext* begin() = 0;
+            virtual std::auto_ptr<TransactionContext> begin() = 0;
             virtual void commit(TransactionContext*) = 0;
             virtual void abort(TransactionContext*) = 0;
 
diff --git a/cpp/src/qpid/broker/TxBuffer.cpp b/cpp/src/qpid/broker/TxBuffer.cpp
index fe2ea8fbb1..920b9862b0 100644
--- a/cpp/src/qpid/broker/TxBuffer.cpp
+++ b/cpp/src/qpid/broker/TxBuffer.cpp
@@ -20,27 +20,31 @@
 using std::mem_fun;
 using namespace qpid::broker;
 
-bool TxBuffer::prepare(TransactionalStore* const store){
-    TransactionContext* ctxt(0);
+bool TxBuffer::prepare(TransactionalStore* const store)
+{
+    std::auto_ptr<TransactionContext> ctxt;
     if(store) ctxt = store->begin();
     for(op_iterator i = ops.begin(); i < ops.end(); i++){
-        if(!(*i)->prepare(ctxt)){
-            if(store) store->abort(ctxt);
+        if(!(*i)->prepare(ctxt.get())){
+            if(store) store->abort(ctxt.get());
             return false;
         }
     }
-    if(store) store->commit(ctxt);
+    if(store) store->commit(ctxt.get());
     return true;
 }
 
-void TxBuffer::commit(){
+void TxBuffer::commit()
+{
     for_each(ops.begin(), ops.end(), mem_fun(&TxOp::commit));
 }
 
-void TxBuffer::rollback(){
+void TxBuffer::rollback()
+{
     for_each(ops.begin(), ops.end(), mem_fun(&TxOp::rollback));
 }
 
-void TxBuffer::enlist(TxOp* const op){
+void TxBuffer::enlist(TxOp* const op)
+{
     ops.push_back(op);
 }
-- 
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