* src/qpid/framing/ResumeHandler.cpp: Handle ack and resume logic

     for broker and client.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@580984 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 125 insertions, 0 deletions

diff --git a/cpp/src/qpid/framing/ResumeHandler.cpp b/cpp/src/qpid/framing/ResumeHandler.cpp
new file mode 100644
index 0000000000..9d2c971459
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+++ b/cpp/src/qpid/framing/ResumeHandler.cpp
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+/*
+ *
+ * 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 WARRANTIE4bS OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "ResumeHandler.h"
+#include "qpid/framing/reply_exceptions.h"
+
+#include <boost/bind.hpp>
+
+#include <algorithm>
+
+namespace qpid {
+namespace framing {
+
+void  ResumeHandler::ackReceived(SequenceNumber acked) {
+    if (lastSent < acked)
+        throw InvalidArgumentException("Invalid sequence number in ack");
+    size_t keep = lastSent - acked;
+    if (keep < unacked.size()) 
+        unacked.erase(unacked.begin(), unacked.end()-keep);
+}
+
+void ResumeHandler::resend() {
+    std::for_each(unacked.begin(), unacked.end(),
+                  boost::bind(&FrameHandler::handle,out->next, _1));
+}
+
+void ResumeHandler::handleIn(AMQFrame& f) {
+    ++lastReceived;
+    in.next->handle(f);
+}
+
+void ResumeHandler::handleOut(AMQFrame& f) {
+    ++lastSent;
+    unacked.push_back(f);
+    out.next->handle(f);
+}
+
+
+}} // namespace qpid::framing
diff --git a/cpp/src/qpid/framing/ResumeHandler.h b/cpp/src/qpid/framing/ResumeHandler.h
new file mode 100644
index 0000000000..c86a60b9cb
--- /dev/null
+++ b/cpp/src/qpid/framing/ResumeHandler.h
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+#ifndef QPID_FRAMING_RESUMEHANDLER_H
+#define QPID_FRAMING_RESUMEHANDLER_H
+
+/*
+ *
+ * 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/framing/AMQFrame.h"
+#include "qpid/framing/FrameHandler.h"
+#include "qpid/framing/SequenceNumber.h"
+
+#include <deque>
+
+namespace qpid {
+namespace framing {
+
+/**
+ * In/out handler pair for managing exactly-once session delivery.
+ * The same handler is used by client and broker.
+ * This handler only deals with TCP style SequenceNumber acks,
+ * not with fragmented SequenceNumberSet.
+ *
+ * THREAD UNSAFE. Expected to be used in a serialized context.
+ */
+class ResumeHandler : public FrameHandler::InOutHandler
+{
+  public:
+    /** Received acknowledgement for sent frames up to and including sentOk */
+    void ackReceived(SequenceNumber sentOk);
+
+    /** What was the last sequence number we received. */
+    SequenceNumber getLastReceived() { return lastReceived; }
+
+    /** Resend the unacked frames to the output handler */
+    void resend();
+
+  protected:
+    void handleIn(AMQFrame&);
+    void handleOut(AMQFrame&);
+    
+  private:
+    typedef std::deque<AMQFrame> Frames;
+    Frames unacked;
+    SequenceNumber lastReceived;
+    SequenceNumber lastSent;
+};
+
+
+}} // namespace qpid::common
+
+
+#endif  /*!QPID_FRAMING_RESUMEHANDLER_H*/