1 files changed, 103 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/broker/TxBuffer.cpp b/qpid/cpp/src/qpid/broker/TxBuffer.cpp
new file mode 100644
index 0000000000..f7552f16a3
--- /dev/null
+++ b/qpid/cpp/src/qpid/broker/TxBuffer.cpp
@@ -0,0 +1,103 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "qpid/broker/TxBuffer.h"
+#include "qpid/broker/TransactionObserver.h"
+#include "qpid/log/Statement.h"
+#include "qpid/framing/reply_exceptions.h"
+
+#include <boost/mem_fn.hpp>
+#include <boost/bind.hpp>
+
+namespace qpid {
+namespace broker{
+
+using boost::mem_fn;
+using framing::InternalErrorException;
+
+TxBuffer::TxBuffer() : observer(new NullTransactionObserver) {}
+
+bool TxBuffer::prepare(TransactionContext* const ctxt)
+{
+    // The observer may call startCompleter to delay completion.
+    if (!observer->prepare()) return false;
+    for(op_iterator i = ops.begin(); i != ops.end(); i++){
+        if(!(*i)->prepare(ctxt)) return false;
+    }
+    // At this point prepare has succeeded locally but if completion is delayed,
+    // then completing threads may call setError to indicate an error.
+    return true;
+}
+
+void TxBuffer::commit()
+{
+    observer->commit();
+    std::for_each(ops.begin(), ops.end(), mem_fn(&TxOp::commit));
+    ops.clear();
+}
+
+void TxBuffer::rollback()
+{
+    observer->rollback();
+    std::for_each(ops.begin(), ops.end(), mem_fn(&TxOp::rollback));
+    ops.clear();
+}
+
+void TxBuffer::enlist(TxOp::shared_ptr op)
+{
+    op->callObserver(observer);
+    ops.push_back(op);
+}
+
+void TxBuffer::startCommit(TransactionalStore* const store)
+{
+    if (!store) throw Exception("Can't commit transaction, no store.");
+    txContext.reset(store->begin().release());
+    if (!prepare(txContext.get()))
+        setError("Transaction prepare failed.");
+}
+
+// Called when async completion is complete.
+std::string TxBuffer::endCommit(TransactionalStore* const store) {
+    std::string e;
+    {
+        sys::Mutex::ScopedLock l(errorLock);
+        e = error;
+    }
+    if (!e.empty()) {
+        store->abort(*txContext);
+        rollback();
+        throw InternalErrorException(e);
+    }
+    else {
+        store->commit(*txContext);
+        commit();
+    }
+    return std::string();       // There is no result from tx.commit
+}
+
+void TxBuffer::setError(const std::string& e) {
+    QPID_LOG(error, "Asynchronous transaction error: " << e);
+    sys::Mutex::ScopedLock l(errorLock);
+    if (!error.empty()) error += " ";
+    error += e;
+}
+
+}} // namespace qpid::broker