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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/init.h"
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/base/status.h"
#include "mongo/logger/message_event_utf8_encoder.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"
#include "mongo/util/time_support.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;
/// This flag indicates whether the system providing a per-thread cache of ostringstreams
/// for use by LogstreamBuilder instances is initialized and ready for use. Until this
/// flag is true, LogstreamBuilder instances must not use the cache.
bool isThreadOstreamCacheInitialized = false;
MONGO_INITIALIZER(LogstreamBuilder)(InitializerContext*) {
isThreadOstreamCacheInitialized = true;
return Status::OK();
}
} // 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) {
if ( !_baseMessage.empty() ) _baseMessage.push_back(' ');
_baseMessage += _os->str();
MessageEventEphemeral message(curTimeMillis64(), _severity, _contextName, _baseMessage);
_domain->append(message);
if (_tee) {
_os->str("");
logger::MessageEventDetailsEncoder teeEncoder;
teeEncoder.encode(message, *_os);
_tee->write(_os->str());
}
_os->str("");
if (isThreadOstreamCacheInitialized && threadOstreamCache.getMake()->vector().empty()) {
threadOstreamCache.get()->mutableVector().push_back(_os);
}
else {
delete _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) {
if (isThreadOstreamCacheInitialized &&
!threadOstreamCache.getMake()->vector().empty()) {
std::vector<std::ostringstream*>& oses = threadOstreamCache.get()->mutableVector();
_os = oses.back();
oses.pop_back();
}
else {
_os = new std::ostringstream;
}
}
}
} // namespace logger
} // namespace mongo
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