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Diffstat (limited to 'cpp/src/qpid/sys/Timer.cpp')
| -rw-r--r-- | cpp/src/qpid/sys/Timer.cpp | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/cpp/src/qpid/sys/Timer.cpp b/cpp/src/qpid/sys/Timer.cpp deleted file mode 100644 index fdb2e8c6bb..0000000000 --- a/cpp/src/qpid/sys/Timer.cpp +++ /dev/null @@ -1,205 +0,0 @@ -/* - * - * Licensed to the Apache Software Foundation (ASF) under one - * or more contributor license agreements. See the NOTICE file - * distributed with this work for additional information - * regarding copyright ownership. The ASF licenses this file - * to you under the Apache License, Version 2.0 (the - * "License"); you may not use this file except in compliance - * with the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, - * software distributed under the License is distributed on an - * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY - * KIND, either express or implied. See the License for the - * specific language governing permissions and limitations - * under the License. - * - */ -#include "qpid/sys/Timer.h" -#include "qpid/sys/Mutex.h" -#include "qpid/log/Statement.h" - -#include <numeric> - -using boost::intrusive_ptr; -using std::max; - -namespace qpid { -namespace sys { - -TimerTask::TimerTask(Duration timeout, const std::string& n) : - name(n), - sortTime(AbsTime::FarFuture()), - period(timeout), - nextFireTime(AbsTime::now(), timeout), - cancelled(false) -{} - -TimerTask::TimerTask(AbsTime time, const std::string& n) : - name(n), - sortTime(AbsTime::FarFuture()), - period(0), - nextFireTime(time), - cancelled(false) -{} - -TimerTask::~TimerTask() {} - -bool TimerTask::readyToFire() const { - return !(nextFireTime > AbsTime::now()); -} - -void TimerTask::fireTask() { - cancelled = true; - fire(); -} - -// This can only be used to setup the next fire time. After the Timer has already fired -void TimerTask::setupNextFire() { - if (period && readyToFire()) { - nextFireTime = max(AbsTime::now(), AbsTime(nextFireTime, period)); - cancelled = false; - } else { - QPID_LOG(error, name << " couldn't setup next timer firing: " << Duration(nextFireTime, AbsTime::now()) << "[" << period << "]"); - } -} - -// Only allow tasks to be delayed -void TimerTask::restart() { nextFireTime = max(nextFireTime, AbsTime(AbsTime::now(), period)); } - -void TimerTask::cancel() { - ScopedLock<Mutex> l(callbackLock); - cancelled = true; -} - -Timer::Timer() : - active(false), - late(50 * TIME_MSEC), - overran(2 * TIME_MSEC), - lateCancel(500 * TIME_MSEC), - warn(5 * TIME_SEC) -{ - start(); -} - -Timer::~Timer() -{ - stop(); -} - -// TODO AStitcher 21/08/09 The threshholds for emitting warnings are a little arbitrary -void Timer::run() -{ - Monitor::ScopedLock l(monitor); - while (active) { - if (tasks.empty()) { - monitor.wait(); - } else { - intrusive_ptr<TimerTask> t = tasks.top(); - tasks.pop(); - assert(!(t->nextFireTime < t->sortTime)); - - // warn on extreme lateness - AbsTime start(AbsTime::now()); - Duration delay(t->sortTime, start); - { - ScopedLock<Mutex> l(t->callbackLock); - if (t->cancelled) { - { - Monitor::ScopedUnlock u(monitor); - drop(t); - } - if (delay > lateCancel) { - QPID_LOG(debug, t->name << " cancelled timer woken up " << - delay / TIME_MSEC << "ms late"); - } - continue; - } else if(Duration(t->nextFireTime, start) >= 0) { - { - Monitor::ScopedUnlock u(monitor); - fire(t); - } - // Warn if callback overran next timer's start. - AbsTime end(AbsTime::now()); - Duration overrun (0); - if (!tasks.empty()) { - overrun = Duration(tasks.top()->nextFireTime, end); - } - bool warningsEnabled; - QPID_LOG_TEST(warning, warningsEnabled); - if (warningsEnabled) { - if (overrun > overran) { - if (delay > overran) // if delay is significant to an overrun. - warn.lateAndOverran(t->name, delay, overrun, Duration(start, end)); - else - warn.overran(t->name, overrun, Duration(start, end)); - } - else if (delay > late) - warn.late(t->name, delay); - } - continue; - } else { - // If the timer was adjusted into the future it might no longer - // be the next event, so push and then get top to make sure - // You can only push events into the future - t->sortTime = t->nextFireTime; - tasks.push(t); - } - } - assert(!tasks.empty()); - monitor.wait(tasks.top()->sortTime); - } - } -} - -void Timer::add(intrusive_ptr<TimerTask> task) -{ - Monitor::ScopedLock l(monitor); - task->sortTime = task->nextFireTime; - tasks.push(task); - monitor.notify(); -} - -void Timer::start() -{ - Monitor::ScopedLock l(monitor); - if (!active) { - active = true; - runner = Thread(this); - } -} - -void Timer::stop() -{ - { - Monitor::ScopedLock l(monitor); - if (!active) return; - active = false; - monitor.notifyAll(); - } - runner.join(); -} - -// Allow subclasses to override behavior when firing a task. -void Timer::fire(boost::intrusive_ptr<TimerTask> t) { - try { - t->fireTask(); - } catch (const std::exception& e) { - QPID_LOG(error, "Exception thrown by timer task " << t->getName() << ": " << e.what()); - } -} - -// Provided for subclasses: called when a task is droped. -void Timer::drop(boost::intrusive_ptr<TimerTask>) {} - -bool operator<(const intrusive_ptr<TimerTask>& a, - const intrusive_ptr<TimerTask>& b) -{ - // Lower priority if time is later - return a.get() && b.get() && a->sortTime > b->sortTime; -} - -}} |