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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/decoration_registry.h"
namespace mongo {
DecorationContainer::DecorationDescriptor DecorationRegistry::declareDecoration(
const size_t sizeBytes,
const size_t alignBytes,
const DecorationConstructorFn constructor,
const DecorationDestructorFn destructor) {
const size_t misalignment = _totalSizeBytes % alignBytes;
if (misalignment) {
_totalSizeBytes += alignBytes - misalignment;
}
DecorationContainer::DecorationDescriptor result(_totalSizeBytes);
_decorationInfo.push_back(DecorationInfo(result, constructor, destructor));
_totalSizeBytes += sizeBytes;
return result;
}
void DecorationRegistry::construct(DecorationContainer* decorable) const {
auto iter = _decorationInfo.cbegin();
try {
for (; iter != _decorationInfo.cend(); ++iter) {
iter->constructor(decorable->getDecoration(iter->descriptor));
}
} catch (...) {
try {
while (iter != _decorationInfo.cbegin()) {
--iter;
iter->destructor(decorable->getDecoration(iter->descriptor));
}
} catch (...) {
std::terminate();
}
throw;
}
}
void DecorationRegistry::destruct(DecorationContainer* decorable) const {
try {
for (DecorationInfoVector::const_reverse_iterator iter = _decorationInfo.rbegin(),
end = _decorationInfo.rend();
iter != end;
++iter) {
iter->destructor(decorable->getDecoration(iter->descriptor));
}
} catch (...) {
std::terminate();
}
}
DecorationRegistry::DecorationInfo::DecorationInfo(
DecorationContainer::DecorationDescriptor inDescriptor,
DecorationConstructorFn inConstructor,
DecorationDestructorFn inDestructor)
: descriptor(std::move(inDescriptor)),
constructor(std::move(inConstructor)),
destructor(std::move(inDestructor)) {}
} // namespace mongo
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