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#ifndef QPID_BROKER_CREDIT_H
#define QPID_BROKER_CREDIT_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/sys/IntegerTypes.h"
#include <memory>
#include <ostream>
namespace qpid {
namespace broker {
class CreditBalance {
public:
CreditBalance();
virtual ~CreditBalance();
void clear();
void grant(uint32_t value);
virtual void consume(uint32_t value);
virtual bool check(uint32_t required) const;
virtual uint32_t remaining() const;
uint32_t allocated() const;
bool unlimited() const;
static const uint32_t INFINITE_CREDIT;
friend std::ostream& operator<<(std::ostream&, const CreditBalance&);
private:
uint32_t balance;
};
class CreditWindow : public CreditBalance {
public:
CreditWindow();
bool check(uint32_t required) const;
void consume(uint32_t value);
void move(uint32_t value);
uint32_t remaining() const;
uint32_t consumed() const;
friend std::ostream& operator<<(std::ostream&, const CreditWindow&);
private:
uint32_t used;
};
template<class T> struct CreditPair
{
T messages;
T bytes;
};
class Credit {
public:
Credit();
void setWindowMode(bool);
bool isWindowMode() const;
void addByteCredit(uint32_t);
void addMessageCredit(uint32_t);
void consume(uint32_t messages, uint32_t bytes);
void moveWindow(uint32_t messages, uint32_t bytes);
bool check(uint32_t messages, uint32_t bytes) const;
void cancel();
operator bool() const;
CreditPair<uint32_t> allocated() const;
CreditPair<uint32_t> used() const;
friend std::ostream& operator<<(std::ostream&, const Credit&);
private:
CreditPair<CreditBalance> balance;
CreditPair<CreditWindow> window;
bool windowing;
CreditBalance& bytes();
CreditBalance& messages();
const CreditBalance& bytes() const;
const CreditBalance& messages() const;
};
std::ostream& operator<<(std::ostream&, const Credit&);
}} // namespace qpid::broker
#endif /*!QPID_BROKER_CREDIT_H*/
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