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// Copyright (c) 2012 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 "chrome/browser/metrics/field_trial_synchronizer.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/threading/thread.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/render_messages.h"
#include "components/variations/variations_util.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
using content::BrowserThread;
namespace {
// This singleton instance should be constructed during the single threaded
// portion of main(). It initializes globals to provide support for all future
// calls. This object is created on the UI thread, and it is destroyed after
// all the other threads have gone away.
FieldTrialSynchronizer* g_field_trial_synchronizer = NULL;
} // namespace
FieldTrialSynchronizer::FieldTrialSynchronizer() {
DCHECK(g_field_trial_synchronizer == NULL);
g_field_trial_synchronizer = this;
base::FieldTrialList::AddObserver(this);
variations::SetVariationListCrashKeys();
}
void FieldTrialSynchronizer::NotifyAllRenderers(
const std::string& field_trial_name,
const std::string& group_name) {
// To iterate over RenderProcessHosts, or to send messages to the hosts, we
// need to be on the UI thread.
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Check that the sender's PID doesn't change between messages. We expect
// these IPCs to always be delivered from the same browser process, whose pid
// should not change.
// TODO(asvitkine): Remove this after http://crbug.com/359406 is fixed.
static base::ProcessId sender_pid = base::Process::Current().Pid();
for (content::RenderProcessHost::iterator it(
content::RenderProcessHost::AllHostsIterator());
!it.IsAtEnd(); it.Advance()) {
it.GetCurrentValue()->Send(new ChromeViewMsg_SetFieldTrialGroup(
field_trial_name, group_name, sender_pid));
}
}
void FieldTrialSynchronizer::OnFieldTrialGroupFinalized(
const std::string& field_trial_name,
const std::string& group_name) {
// TODO(asvitkine): Remove these CHECKs once http://crbug.com/359406 is fixed.
CHECK(!field_trial_name.empty() && !group_name.empty());
CHECK_EQ(group_name, base::FieldTrialList::FindFullName(field_trial_name))
<< field_trial_name << ":" << group_name << "=>"
<< base::FieldTrialList::FindFullName(field_trial_name);
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&FieldTrialSynchronizer::NotifyAllRenderers,
this,
field_trial_name,
group_name));
variations::SetVariationListCrashKeys();
}
FieldTrialSynchronizer::~FieldTrialSynchronizer() {
base::FieldTrialList::RemoveObserver(this);
g_field_trial_synchronizer = NULL;
}
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