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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 "chrome/browser/policy/logging_work_scheduler.h"
#include <algorithm>
#include "base/compiler_specific.h"
#include "content/browser/browser_thread.h"
namespace policy {
EventLogger::Task::Task() {
}
EventLogger::Task::Task(int64 trigger_time,
int64 secondary_key,
linked_ptr<base::Closure> callback)
: trigger_time_(trigger_time),
secondary_key_(secondary_key),
callback_(callback) {
}
EventLogger::Task::~Task() {
}
bool EventLogger::Task::operator< (const Task& rhs) const {
if (trigger_time_ == rhs.trigger_time_) {
return secondary_key_ < rhs.secondary_key_;
} else {
return trigger_time_ > rhs.trigger_time_;
}
}
int64 EventLogger::Task::trigger_time() const {
return trigger_time_;
}
base::Closure EventLogger::Task::GetAndResetCallback() {
// Make a copy.
base::Closure callback = *(callback_.get());
// Reset the original callback, which is shared with LoggingTaskScheduler.
callback_->Reset();
return callback;
}
EventLogger::EventLogger()
: step_task_(NULL),
ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
current_time_(0),
task_counter_(0) {
}
EventLogger::~EventLogger() {
}
void EventLogger::PostDelayedWork(
linked_ptr<base::Closure> callback,
int64 delay) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
int64 trigger_time = current_time_ + delay;
task_counter_++;
scheduled_tasks_.push(Task(trigger_time, task_counter_, callback));
if (!step_task_) {
step_task_ = method_factory_.NewRunnableMethod(&EventLogger::Step);
MessageLoop::current()->PostTask(FROM_HERE, step_task_);
}
}
void EventLogger::RegisterEvent() {
events_.push_back(current_time_);
}
void EventLogger::Swap(std::vector<int64>* events) {
std::swap(events_, *events);
}
// static
// Counts the number of elements in a sorted integer vector that are
// >= |start| but < |start| + |length|.
int EventLogger::CountEvents(const std::vector<int64>& events,
int64 start, int64 length) {
// The first interesting event.
std::vector<int64>::const_iterator begin_it =
std::lower_bound(events.begin(), events.end(), start);
// The event after the last interesting event.
std::vector<int64>::const_iterator end_it =
std::lower_bound(begin_it, events.end(), start + length);
return end_it - begin_it;
}
void EventLogger::Step() {
DCHECK(step_task_);
step_task_ = NULL;
if (scheduled_tasks_.empty())
return;
// Take the next scheduled task from the queue.
Task next = scheduled_tasks_.top();
scheduled_tasks_.pop();
base::Closure callback = next.GetAndResetCallback();
int64 trigger_time = next.trigger_time();
DCHECK(trigger_time >= current_time_);
// Execute the next scheduled task if it was not cancelled.
if (!callback.is_null()) {
current_time_ = trigger_time;
callback.Run(); // Note: new items may be added to scheduled_tasks_ here.
}
// Trigger calling this method if there are remaining tasks.
if (!step_task_ && !scheduled_tasks_.empty()) {
step_task_ = method_factory_.NewRunnableMethod(&EventLogger::Step);
MessageLoop::current()->PostTask(FROM_HERE, step_task_);
}
}
DummyWorkScheduler::DummyWorkScheduler() {
}
DummyWorkScheduler::~DummyWorkScheduler() {
CancelDelayedWork();
}
void DummyWorkScheduler::PostDelayedWork(
const base::Closure& callback, int64 delay) {
DelayedWorkScheduler::PostDelayedWork(callback, 0);
}
LoggingWorkScheduler::LoggingWorkScheduler(EventLogger* logger)
: logger_(logger) {
}
LoggingWorkScheduler::~LoggingWorkScheduler() {
if (callback_.get())
callback_->Reset();
}
void LoggingWorkScheduler::PostDelayedWork(
const base::Closure& callback, int64 delay) {
DCHECK(!callback_.get() || callback_->is_null());
callback_.reset(new base::Closure(callback));
logger_->PostDelayedWork(callback_, delay);
}
void LoggingWorkScheduler::CancelDelayedWork() {
if (!callback_.get()) return;
callback_->Reset(); // Erase the callback to the delayed work.
callback_.reset(NULL); // Erase the pointer to the callback.
}
} // namespace policy
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