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#include "Bounds.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Waitable.h"
namespace qpid {
namespace client {
using sys::Waitable;
Bounds::Bounds(size_t maxSize) : max(maxSize), current(0) {}
bool Bounds::expand(size_t sizeRequired, bool block) {
if (!max) return true;
Waitable::ScopedLock l(lock);
current += sizeRequired;
if (block) {
Waitable::ScopedWait w(lock);
while (current > max)
lock.wait();
}
return current <= max;
}
void Bounds::reduce(size_t size) {
if (!max || size == 0) return;
Waitable::ScopedLock l(lock);
if (current == 0) return;
current -= std::min(size, current);
if (current < max && lock.hasWaiters()) {
assert(lock.hasWaiters() == 1);
lock.notify();
}
}
size_t Bounds::getCurrentSize() {
Waitable::ScopedLock l(lock);
return current;
}
std::ostream& operator<<(std::ostream& out, const Bounds& bounds) {
out << "current=" << bounds.current << ", max=" << bounds.max << " [" << &bounds << "]";
return out;
}
void Bounds::setException(const sys::ExceptionHolder& e) {
Waitable::ScopedLock l(lock);
lock.setException(e);
lock.waitWaiters(); // Wait for waiting threads to exit.
}
}} // namespace qpid::client
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