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/**
* Copyright (C) 2017 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/db/operation_context_group.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
namespace mongo {
namespace {
using ContextTable = std::vector<ServiceContext::UniqueOperationContext>;
auto find(ContextTable& contexts, OperationContext* cp) {
auto it = std::find_if(
contexts.begin(), contexts.end(), [cp](auto const& opCtx) { return opCtx.get() == cp; });
invariant(it != contexts.end());
return it;
}
void interruptOne(OperationContext* opCtx, ErrorCodes::Error code) {
stdx::lock_guard<Client> lk(*opCtx->getClient());
opCtx->getServiceContext()->killOperation(opCtx, code);
}
} // namespace
// OperationContextGroup::Context
OperationContextGroup::Context::Context(OperationContext& ctx, OperationContextGroup& group)
: _opCtx(ctx), _ctxGroup(group) {}
void OperationContextGroup::Context::discard() {
if (!_movedFrom) {
stdx::lock_guard<stdx::mutex> lk(_ctxGroup._lock);
auto it = find(_ctxGroup._contexts, &_opCtx);
_ctxGroup._contexts.erase(it);
_movedFrom = true;
}
}
// OperationContextGroup
auto OperationContextGroup::makeOperationContext(Client& client) -> Context {
return adopt(client.makeOperationContext());
}
auto OperationContextGroup::adopt(UniqueOperationContext opCtx) -> Context {
auto cp = opCtx.get();
invariant(cp);
stdx::lock_guard<stdx::mutex> lk(_lock);
_contexts.emplace_back(std::move(opCtx));
if (_interrupted) {
interruptOne(cp, _interrupted);
}
return Context(*cp, *this);
}
auto OperationContextGroup::take(Context ctx) -> Context {
if (ctx._movedFrom || &ctx._ctxGroup == this) {
return ctx;
}
{
stdx::lock_guard<stdx::mutex> lk(_lock);
auto it = find(ctx._ctxGroup._contexts, &ctx._opCtx);
_contexts.emplace_back(std::move(*it));
ctx._ctxGroup._contexts.erase(it);
}
ctx._movedFrom = true;
return Context(ctx._opCtx, *this);
}
void OperationContextGroup::interrupt(ErrorCodes::Error code) {
invariant(code);
stdx::lock_guard<stdx::mutex> lk(_lock);
_interrupted = code;
for (auto&& uniqueOperationContext : _contexts) {
interruptOne(uniqueOperationContext.get(), code);
}
}
void OperationContextGroup::resetInterrupt() {
stdx::lock_guard<stdx::mutex> lk(_lock);
_interrupted = ErrorCodes::Error{};
}
bool OperationContextGroup::isEmpty() {
stdx::lock_guard<stdx::mutex> lk(_lock);
return _contexts.empty();
}
} // namespace mongo
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