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// Copyright 2014 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 "base/metrics/user_metrics.h"
#include <stddef.h>
#include <vector>
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
namespace base {
namespace {
LazyInstance<std::vector<ActionCallback>> g_callbacks =
LAZY_INSTANCE_INITIALIZER;
LazyInstance<scoped_refptr<SingleThreadTaskRunner>> g_task_runner =
LAZY_INSTANCE_INITIALIZER;
} // namespace
void RecordAction(const UserMetricsAction& action) {
RecordComputedAction(action.str_);
}
void RecordComputedAction(const std::string& action) {
if (!g_task_runner.Get()) {
DCHECK(g_callbacks.Get().empty());
return;
}
if (!g_task_runner.Get()->BelongsToCurrentThread()) {
g_task_runner.Get()->PostTask(FROM_HERE,
Bind(&RecordComputedAction, action));
return;
}
for (const ActionCallback& callback : g_callbacks.Get()) {
callback.Run(action);
}
}
void AddActionCallback(const ActionCallback& callback) {
// Only allow adding a callback if the task runner is set.
DCHECK(g_task_runner.Get());
DCHECK(g_task_runner.Get()->BelongsToCurrentThread());
g_callbacks.Get().push_back(callback);
}
void RemoveActionCallback(const ActionCallback& callback) {
DCHECK(g_task_runner.Get());
DCHECK(g_task_runner.Get()->BelongsToCurrentThread());
std::vector<ActionCallback>* callbacks = g_callbacks.Pointer();
for (size_t i = 0; i < callbacks->size(); ++i) {
if ((*callbacks)[i].Equals(callback)) {
callbacks->erase(callbacks->begin() + i);
return;
}
}
}
void SetRecordActionTaskRunner(
scoped_refptr<SingleThreadTaskRunner> task_runner) {
DCHECK(task_runner->BelongsToCurrentThread());
DCHECK(!g_task_runner.Get() || g_task_runner.Get()->BelongsToCurrentThread());
g_task_runner.Get() = task_runner;
}
} // namespace base
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