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// Copyright (c) 2011 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 "content/browser/trace_controller.h"
#include "base/task.h"
#include "content/browser/browser_message_filter.h"
#include "content/browser/trace_message_filter.h"
#include "content/common/child_process_messages.h"
#include "gpu/common/gpu_trace_event.h"
TraceController::TraceController() :
pending_ack_count_(0),
is_tracing_(false),
subscriber_(NULL) {
gpu::TraceLog::GetInstance()->SetOutputCallback(
NewCallback(this, &TraceController::OnTraceDataCollected));
}
TraceController::~TraceController() {
gpu::TraceLog::GetInstance()->SetOutputCallback(NULL);
}
//static
TraceController* TraceController::GetInstance() {
return Singleton<TraceController>::get();
}
bool TraceController::BeginTracing(TraceSubscriber* subscriber) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!can_begin_tracing() ||
(subscriber_ != NULL && subscriber != subscriber_))
return false;
subscriber_ = subscriber;
// Enable tracing
is_tracing_ = true;
gpu::TraceLog::GetInstance()->SetEnabled(true);
// Notify all child processes.
for (FilterMap::iterator it = filters_.begin(); it != filters_.end(); ++it) {
it->get()->SendBeginTracing();
}
return true;
}
bool TraceController::EndTracingAsync(TraceSubscriber* subscriber) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!can_end_tracing() || subscriber != subscriber_)
return false;
// There could be a case where there are no child processes and filters_
// is empty. In that case we can immediately tell the subscriber that tracing
// has ended. To avoid recursive calls back to the subscriber, we will just
// use the existing asynchronous OnEndTracingAck code.
// Count myself (local trace) in pending_ack_count_, acked below.
pending_ack_count_ = filters_.size() + 1;
// Handle special case of zero child processes.
if (pending_ack_count_ == 1) {
// Ack asynchronously now, because we don't have any children to wait for.
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::OnEndTracingAck));
}
// Notify all child processes.
for (FilterMap::iterator it = filters_.begin(); it != filters_.end(); ++it) {
it->get()->SendEndTracing();
}
return true;
}
void TraceController::CancelSubscriber(TraceSubscriber* subscriber) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (subscriber == subscriber_) {
subscriber_ = NULL;
// End tracing if necessary.
if (is_tracing_ && pending_ack_count_ == 0)
EndTracingAsync(NULL);
}
}
void TraceController::AddFilter(TraceMessageFilter* filter) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::AddFilter,
make_scoped_refptr(filter)));
return;
}
filters_.insert(filter);
if (is_tracing_enabled()) {
filter->SendBeginTracing();
}
}
void TraceController::RemoveFilter(TraceMessageFilter* filter) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::RemoveFilter,
make_scoped_refptr(filter)));
return;
}
filters_.erase(filter);
}
void TraceController::OnEndTracingAck() {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::OnEndTracingAck));
return;
}
if (--pending_ack_count_ == 0) {
// All acks have been received.
is_tracing_ = false;
// Disable local trace. During this call, our OnTraceDataCollected will be
// called with the last of the local trace data. Since we are on the UI
// thread, the call to OnTraceDataCollected will be synchronous, so we can
// immediately call OnEndTracingComplete below.
gpu::TraceLog::GetInstance()->SetEnabled(false);
// Trigger callback if one is set.
if (subscriber_ != NULL) {
subscriber_->OnEndTracingComplete();
// Clear subscriber so that others can use TraceController.
subscriber_ = NULL;
}
}
if (pending_ack_count_ == 1) {
// The last ack represents local trace, so we need to ack it now. Note that
// this code only executes if there were child processes.
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::OnEndTracingAck));
}
}
void TraceController::OnTraceDataCollected(const std::string& data) {
// OnTraceDataCollected may be called from any browser thread, either by the
// local event trace system or from child processes bia TraceMessageFilter.
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
NewRunnableMethod(this, &TraceController::OnTraceDataCollected, data));
return;
}
if (subscriber_) {
subscriber_->OnTraceDataCollected(data);
}
}
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