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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/base/tracer.h"
#include <list>
#include "base/basictypes.h"
#include "base/condition_variable.h"
#include "base/message_loop.h"
#include "base/rand_util.h"
#include "base/ref_counted.h"
#include "base/stl_util-inl.h"
#include "base/thread.h"
#include "base/time.h"
namespace remoting {
namespace {
class OutputLogger {
public:
OutputLogger()
: thread_("logging_thread"),
stopped_(false),
wake_(&lock_) {
thread_.Start();
thread_.message_loop()->PostTask(
FROM_HERE,
NewRunnableMethod(this, &OutputLogger::PrintLogs));
}
void OutputTrace(TraceBuffer* buffer) {
scoped_ptr<TraceBuffer> buffer_ref_(buffer);
AutoLock l(lock_);
// Drop messages if we're overwhelming the logger.
if (buffers_.size() < 10) {
buffers_.push_front(buffer_ref_.release());
wake_.Signal();
} else {
// TODO(ajwong): Remove this cause it just overwhelms the logging more.
LOG(WARNING) << "Message dropped.";
}
}
void LogOneTrace(TraceBuffer* buffer) {
LOG(INFO) << "Trace: " << buffer->name();
base::Time last_timestamp;
for (int i = 0; i < buffer->record_size(); ++i) {
const TraceRecord& record = buffer->record(i);
base::Time timestamp = base::Time::FromInternalValue(record.timestamp());
if (i == 0) {
LOG(INFO) << " TS: " << record.timestamp()
<< " msg: " << record.annotation();
} else {
base::TimeDelta delta = timestamp - last_timestamp;
LOG(INFO) << " TS: " << record.timestamp()
<< " msg: " << record.annotation()
<< " [ " << delta.InMilliseconds() << "ms ]";
}
last_timestamp = timestamp;
}
}
void PrintLogs() {
while(!stopped_) {
TraceBuffer* buffer = NULL;
{
AutoLock l(lock_);
if (buffers_.size() == 0) {
wake_.Wait();
}
// Check again since we might have woken for a stop signal.
if (buffers_.size() != 0) {
buffer = buffers_.back();
buffers_.pop_back();
}
}
if (buffer) {
LogOneTrace(buffer);
delete buffer;
}
}
}
private:
friend struct DefaultSingletonTraits<OutputLogger>;
~OutputLogger() {
{
AutoLock l(lock_);
stopped_ = true;
wake_.Signal();
}
thread_.Stop();
STLDeleteElements(&buffers_);
}
Lock lock_;
base::Thread thread_;
bool stopped_;
ConditionVariable wake_;
std::list<TraceBuffer*> buffers_;
};
} // namespace
Tracer::Tracer(const std::string& name, double sample_percent) {
if (sample_percent > base::RandDouble()) {
buffer_.reset(new TraceBuffer());
buffer_->set_name(name);
}
}
void Tracer::PrintString(const std::string& s) {
AutoLock l(lock_);
if (!buffer_.get()) {
return;
}
TraceRecord* record = buffer_->add_record();
record->set_annotation(s);
record->set_timestamp(base::Time::Now().ToInternalValue());
// Take the pointer for the current messageloop as identifying for the
// current thread.
record->set_thread_id(static_cast<uint64>(PlatformThread::CurrentId()));
}
Tracer::~Tracer() {
AutoLock l(lock_);
if (buffer_.get()) {
Singleton<OutputLogger>::get()->OutputTrace(buffer_.release());
}
}
} // namespace remoting
DISABLE_RUNNABLE_METHOD_REFCOUNT(remoting::OutputLogger);
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