From 082fa377137d1a73382a0c3f1ab22b5abe6cb485 Mon Sep 17 00:00:00 2001
From: Gordon Sim <gsim@apache.org>
Date: Tue, 25 Aug 2009 17:57:34 +0000
Subject: QPID-664: Initial checkin of high level messaging api for c++

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@807731 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp | 146 ++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp

(limited to 'cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp')

diff --git a/cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp b/cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp
new file mode 100644
index 0000000000..e6ed4bfc4e
--- /dev/null
+++ b/cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp
@@ -0,0 +1,146 @@
+/*
+ *
+ * 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 "ReceiverImpl.h"
+#include "MessageSource.h"
+#include "SessionImpl.h"
+#include "qpid/messaging/MessageListener.h"
+#include "qpid/messaging/Receiver.h"
+
+namespace qpid {
+namespace client {
+namespace amqp0_10 {
+
+using qpid::messaging::Receiver;
+
+void ReceiverImpl::received(qpid::messaging::Message&)
+{
+    //TODO: should this be configurable
+    if (capacity && --window <= capacity/2) {
+        session.sendCompletion();
+        window = capacity;
+    }
+}
+
+bool ReceiverImpl::get(qpid::messaging::Message& message, qpid::sys::Duration timeout)
+{
+    return parent.get(*this, message, timeout);
+}
+    
+qpid::messaging::Message ReceiverImpl::get(qpid::sys::Duration timeout) 
+{
+    qpid::messaging::Message result;
+    if (!get(result, timeout)) throw Receiver::NoMessageAvailable();
+    return result;
+}
+
+bool ReceiverImpl::fetch(qpid::messaging::Message& message, qpid::sys::Duration timeout)
+{
+    if (capacity == 0 && !cancelled) {
+        session.messageFlow(destination, CREDIT_UNIT_MESSAGE, 1);
+        if (!started) session.messageFlow(destination, CREDIT_UNIT_BYTE, byteCredit);
+    }
+    
+    if (get(message, timeout)) {
+        return true;
+    } else {
+        if (!cancelled) {
+            sync(session).messageFlush(destination);
+            start();//reallocate credit
+        }
+        return get(message, 0);
+    }
+}
+    
+qpid::messaging::Message ReceiverImpl::fetch(qpid::sys::Duration timeout) 
+{
+    qpid::messaging::Message result;
+    if (!fetch(result, timeout)) throw Receiver::NoMessageAvailable();
+    return result;
+}
+
+void ReceiverImpl::cancel() 
+{ 
+    if (!cancelled) {
+        //TODO: should syncronicity be an optional argument to this call?
+        source->cancel(session, destination);
+        //need to be sure cancel is complete and all incoming
+        //framesets are processed before removing the receiver
+        parent.receiverCancelled(destination);
+        cancelled = true;
+    }
+}
+
+void ReceiverImpl::start()
+{
+    if (!cancelled) {
+        started = true;
+        session.messageSetFlowMode(destination, capacity > 0);
+        session.messageFlow(destination, CREDIT_UNIT_MESSAGE, capacity);
+        session.messageFlow(destination, CREDIT_UNIT_BYTE, byteCredit);
+        window = capacity;
+    }
+}
+
+void ReceiverImpl::stop()
+{
+    session.messageStop(destination);
+    started = false;
+}
+
+void ReceiverImpl::subscribe()
+{
+    source->subscribe(session, destination);
+}
+
+void ReceiverImpl::setSession(qpid::client::AsyncSession s) 
+{ 
+    session = s;
+    if (!cancelled) {
+        subscribe();
+        //if we were in started state before the session was changed,
+        //start again on this new session
+        //TODO: locking if receiver is to be threadsafe...
+        if (started) start();
+    }
+}
+
+void ReceiverImpl::setCapacity(uint32_t c)
+{
+    if (c != capacity) {
+        capacity = c;
+        if (!cancelled && started) {
+            stop();
+            start();
+        }
+    }
+}
+
+void ReceiverImpl::setListener(qpid::messaging::MessageListener* l) { listener = l; }
+qpid::messaging::MessageListener* ReceiverImpl::getListener() { return listener; }
+
+const std::string& ReceiverImpl::getName() const { return destination; }
+
+ReceiverImpl::ReceiverImpl(SessionImpl& p, const std::string& name, std::auto_ptr<MessageSource> s) : 
+    parent(p), source(s), destination(name), byteCredit(0xFFFFFFFF), 
+    capacity(0), started(false), cancelled(false), listener(0), window(0) {}
+
+
+}}} // namespace qpid::client::amqp0_10
-- 
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