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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 "qpid/broker/Credit.h"
namespace qpid {
namespace broker {
const uint32_t CreditBalance::INFINITE_CREDIT(0xFFFFFFFF);
CreditBalance::CreditBalance() : balance(0) {}
CreditBalance::~CreditBalance() {}
void CreditBalance::clear() { balance = 0; }
void CreditBalance::grant(uint32_t value)
{
if (balance != INFINITE_CREDIT) {
if (value == INFINITE_CREDIT) {
balance = INFINITE_CREDIT;
} else if (INFINITE_CREDIT - balance > value) {
balance += value;
} else {
balance = INFINITE_CREDIT - 1;
}
}
}
void CreditBalance::consume(uint32_t value) { if (!unlimited()) balance -= value; }
bool CreditBalance::check(uint32_t required) const { return balance >= required; }
uint32_t CreditBalance::remaining() const { return balance; }
uint32_t CreditBalance::allocated() const { return balance; }
bool CreditBalance::unlimited() const { return balance == INFINITE_CREDIT; }
CreditWindow::CreditWindow() : used(0) {}
bool CreditWindow::check(uint32_t required) const { return CreditBalance::check(used + required); }
void CreditWindow::consume(uint32_t value) { if (!unlimited()) used += value; }
void CreditWindow::move(uint32_t value) { if (!unlimited()) used -= value; }
uint32_t CreditWindow::remaining() const { return allocated() - used; }
uint32_t CreditWindow::consumed() const { return used; }
Credit::Credit() : windowing(true) {}
void Credit::setWindowMode(bool b) { windowing = b; }
bool Credit::isWindowMode() const { return windowing; }
void Credit::addByteCredit(uint32_t value)
{
bytes().grant(value);
}
void Credit::addMessageCredit(uint32_t value)
{
messages().grant(value);
}
void Credit::cancel()
{
messages().clear();
bytes().clear();
}
void Credit::moveWindow(uint32_t m, uint32_t b)
{
if (windowing) {
window.messages.move(m);
window.bytes.move(b);
}
}
void Credit::consume(uint32_t m, uint32_t b)
{
messages().consume(m);
bytes().consume(b);
}
bool Credit::check(uint32_t m, uint32_t b) const
{
return messages().check(m) && bytes().check(b);
}
CreditPair<uint32_t> Credit::used() const
{
CreditPair<uint32_t> result;
if (windowing) {
result.messages = window.messages.consumed();
result.bytes = window.bytes.consumed();
} else {
result.messages = 0;
result.bytes = 0;
}
return result;
}
CreditPair<uint32_t> Credit::allocated() const
{
CreditPair<uint32_t> result;
result.messages = messages().allocated();
result.bytes = bytes().allocated();
return result;
}
Credit::operator bool() const
{
return check(1,1);
}
CreditBalance& Credit::messages()
{
if (windowing) return window.messages;
else return balance.messages;
}
CreditBalance& Credit::bytes()
{
if (windowing) return window.bytes;
else return balance.bytes;
}
const CreditBalance& Credit::messages() const
{
if (windowing) return window.messages;
else return balance.messages;
}
const CreditBalance& Credit::bytes() const
{
if (windowing) return window.bytes;
else return balance.bytes;
}
std::ostream& operator<<(std::ostream& out, const CreditBalance& b)
{
if (b.unlimited()) return out << "unlimited";
else return out << b.balance;
}
std::ostream& operator<<(std::ostream& out, const CreditWindow& w)
{
if (w.unlimited()) return out << ((CreditBalance) w);
else return out << w.remaining() << " (from window of " << w.allocated() << ")";
}
template <class T>
std::ostream& operator<<(std::ostream& out, const CreditPair<T>& pair)
{
return out << "messages: " << pair.messages << " bytes: " << pair.bytes;
}
std::ostream& operator<<(std::ostream& out, const Credit& c)
{
if (c.windowing) return out << c.window;
else return out << c.balance;
}
}} // namespace qpid::broker
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