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#include "Bounds.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace client {
using sys::Monitor;
Bounds::Bounds(size_t maxSize) : max(maxSize), current(0) {}
bool Bounds::expand(size_t sizeRequired, bool block)
{
if (max) {
Monitor::ScopedLock l(lock);
current += sizeRequired;
if (block) {
while (current > max) {
QPID_LOG(debug, "Waiting for bounds: " << *this);
lock.wait();
}
QPID_LOG(debug, "Bounds ok: " << *this);
}
return current <= max;
} else {
return true;
}
}
void Bounds::reduce(size_t size)
{
if (!max || size == 0) return;
Monitor::ScopedLock l(lock);
if (current == 0) return;
bool needNotify = current > max;
current -= std::min(size, current);
if (needNotify && current < max) {
//todo: notify one at a time, but ensure that all threads are
//eventually notified
lock.notifyAll();
}
}
size_t Bounds::getCurrentSize()
{
Monitor::ScopedLock l(lock);
return current;
}
std::ostream& operator<<(std::ostream& out, const Bounds& bounds) {
out << "current=" << bounds.current << ", max=" << bounds.max << " [" << &bounds << "]";
return out;
}
}} // namespace qpid::client
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