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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 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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