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/* Copyright 2013 10gen Inc.
*
* Licensed 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 "mongo/platform/basic.h"
#include "mongo/logger/logstream_builder.h"
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/logger/tee.h"
#include "mongo/util/assert_util.h" // TODO: remove apple dep for this in threadlocal.h
#include "mongo/util/concurrency/threadlocal.h"
namespace mongo {
namespace {
/// Type of per-thread cache for storing pre-constructed ostringstreams. While its type is
/// vector, it should only ever contain 0 or 1 item. It is a vector rather than just a
/// thread_specific_ptr<> because of the high cost of thread_specific_ptr<>::reset().
typedef OwnedPointerVector<std::ostringstream> OwnedOstreamVector;
} // namespace
TSP_DECLARE(OwnedOstreamVector, threadOstreamCache);
TSP_DEFINE(OwnedOstreamVector, threadOstreamCache);
namespace logger {
LogstreamBuilder::LogstreamBuilder(MessageLogDomain* domain,
const std::string& contextName,
LogSeverity severity)
: _domain(domain),
_contextName(contextName),
_severity(severity),
_os(NULL),
_tee(NULL) {
}
LogstreamBuilder::LogstreamBuilder(logger::MessageLogDomain* domain,
const std::string& contextName,
LabeledLevel labeledLevel)
: _domain(domain),
_contextName(contextName),
_severity(labeledLevel),
_os(NULL),
_tee(NULL) {
setBaseMessage(labeledLevel.getLabel());
}
LogstreamBuilder::LogstreamBuilder(const LogstreamBuilder& other)
: _domain(other._domain),
_contextName(other._contextName),
_severity(other._severity),
_baseMessage(other._baseMessage),
_os(NULL),
_tee(NULL) {
if (other._os || other._tee)
abort();
}
LogstreamBuilder::~LogstreamBuilder() {
if (_os) {
_baseMessage += _os->str();
_domain->append(MessageEventEphemeral(_severity, _contextName, _baseMessage));
if (_tee)
_tee->write(_baseMessage);
_os->str("");
std::vector<std::ostringstream*>& cache = threadOstreamCache.getMake()->mutableVector();
if (!cache.empty()) {
cache.push_back(_os);
}
}
}
void LogstreamBuilder::operator<<(Tee* tee) {
makeStream(); // Adding a Tee counts for purposes of deciding to make a log message.
// TODO: dassert(!_tee);
_tee = tee;
}
void LogstreamBuilder::makeStream() {
if (!_os) {
std::vector<std::ostringstream*>& oses = threadOstreamCache.getMake()->mutableVector();
if (oses.empty()) {
_os = new std::ostringstream;
}
else {
_os = oses.back();
oses.pop_back();
}
}
}
} // namespace logger
} // namespace mongo
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