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#ifndef QPID_MESSAGING_RECEIVER_H
#define QPID_MESSAGING_RECEIVER_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/Exception.h"
#include "qpid/client/ClientImportExport.h"
#include "qpid/client/Handle.h"
#include "qpid/sys/Time.h"
namespace qpid {
namespace client {
template <class> class PrivateImplRef;
}
namespace messaging {
class Message;
class ReceiverImpl;
/**
* Interface through which messages are received.
*/
class Receiver : public qpid::client::Handle<ReceiverImpl>
{
public:
struct NoMessageAvailable : qpid::Exception {};
QPID_CLIENT_EXTERN Receiver(ReceiverImpl* impl = 0);
QPID_CLIENT_EXTERN Receiver(const Receiver&);
QPID_CLIENT_EXTERN ~Receiver();
QPID_CLIENT_EXTERN Receiver& operator=(const Receiver&);
/**
* Retrieves a message from this receivers local queue, or waits
* for upto the specified timeout for a message to become
* available. Returns false if there is no message to give after
* waiting for the specified timeout.
*/
QPID_CLIENT_EXTERN bool get(Message& message, qpid::sys::Duration timeout=qpid::sys::TIME_INFINITE);
/**
* Retrieves a message from this receivers local queue, or waits
* for upto the specified timeout for a message to become
* available. Throws NoMessageAvailable if there is no
* message to give after waiting for the specified timeout.
*/
QPID_CLIENT_EXTERN Message get(qpid::sys::Duration timeout=qpid::sys::TIME_INFINITE);
/**
* Retrieves a message for this receivers subscription or waits
* for upto the specified timeout for one to become
* available. Unlike get() this method will check with the server
* that there is no message for the subscription this receiver is
* serving before returning false.
*/
QPID_CLIENT_EXTERN bool fetch(Message& message, qpid::sys::Duration timeout=qpid::sys::TIME_INFINITE);
/**
* Retrieves a message for this receivers subscription or waits
* for up to the specified timeout for one to become
* available. Unlike get() this method will check with the server
* that there is no message for the subscription this receiver is
* serving before throwing an exception.
*/
QPID_CLIENT_EXTERN Message fetch(qpid::sys::Duration timeout=qpid::sys::TIME_INFINITE);
/**
* Sets the capacity for the receiver. The capacity determines how
* many incoming messages can be held in the receiver before being
* requested by a client via fetch() (or pushed to a listener).
*/
QPID_CLIENT_EXTERN void setCapacity(uint32_t);
/**
* Returns the capacity of the receiver. The capacity determines
* how many incoming messages can be held in the receiver before
* being requested by a client via fetch() (or pushed to a
* listener).
*/
QPID_CLIENT_EXTERN uint32_t getCapacity();
/**
* Returns the number of messages received and waiting to be
* fetched.
*/
QPID_CLIENT_EXTERN uint32_t available();
/**
* Returns a count of the number of messages received on this
* receiver that have been acknowledged, but for which that
* acknowledgement has not yet been confirmed as processed by the
* server.
*/
QPID_CLIENT_EXTERN uint32_t pendingAck();
/**
* Cancels this receiver.
*/
QPID_CLIENT_EXTERN void cancel();
private:
friend class qpid::client::PrivateImplRef<Receiver>;
};
}} // namespace qpid::messaging
#endif /*!QPID_MESSAGING_RECEIVER_H*/
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