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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
* Belgium
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* In addition, as a special exception, the copyright holders of this
* program give permission to link the code of its release with the
* OpenSSL project's "OpenSSL" library (or with modified versions of it
* that use the same license as the "OpenSSL" library), and distribute
* the linked executables. You must obey the GNU General Public License
* in all respects for all of the code used other than "OpenSSL". If you
* modify file(s) with this exception, you may extend this exception to
* your version of the file(s), but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source files
* in the program, then also delete it here.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
#include "../PrecompiledHeaders.h"
#include "ThreadedCommandProcessor.h"
#include "../OrthancException.h"
namespace Orthanc
{
static const int32_t TIMEOUT = 10;
void ThreadedCommandProcessor::Processor(ThreadedCommandProcessor* that)
{
while (!that->done_)
{
std::auto_ptr<IDynamicObject> command(that->queue_.Dequeue(TIMEOUT));
if (command.get() != NULL)
{
bool success = false;
try
{
if (that->success_)
{
// No command has failed so far
if (that->cancel_)
{
// The commands have been canceled. Skip the execution
// of this command, yet mark it as succeeded.
success = true;
}
else
{
success = dynamic_cast<ICommand&>(*command).Execute();
}
}
else
{
// A command has already failed. Skip the execution of this command.
}
}
catch (OrthancException)
{
}
{
boost::mutex::scoped_lock lock(that->mutex_);
assert(that->remainingCommands_ > 0);
that->remainingCommands_--;
if (!success)
{
if (!that->cancel_ && that->listener_ && that->success_)
{
// This is the first command that fails
that->listener_->SignalFailure();
}
that->success_ = false;
}
else
{
if (!that->cancel_ && that->listener_)
{
if (that->remainingCommands_ == 0)
{
that->listener_->SignalSuccess(that->totalCommands_);
}
else
{
that->listener_->SignalProgress(that->totalCommands_ - that->remainingCommands_,
that->totalCommands_);
}
}
}
that->processedCommand_.notify_all();
}
}
}
}
ThreadedCommandProcessor::ThreadedCommandProcessor(unsigned int numThreads)
{
if (numThreads < 1)
{
throw OrthancException(ErrorCode_ParameterOutOfRange);
}
listener_ = NULL;
success_ = true;
done_ = false;
cancel_ = false;
threads_.resize(numThreads);
remainingCommands_ = 0;
totalCommands_ = 0;
for (unsigned int i = 0; i < numThreads; i++)
{
threads_[i] = new boost::thread(Processor, this);
}
}
ThreadedCommandProcessor::~ThreadedCommandProcessor()
{
done_ = true;
for (unsigned int i = 0; i < threads_.size(); i++)
{
boost::thread* t = threads_[i];
if (t != NULL)
{
if (t->joinable())
{
t->join();
}
delete t;
}
}
}
void ThreadedCommandProcessor::Post(ICommand* command)
{
if (command == NULL)
{
throw OrthancException(ErrorCode_ParameterOutOfRange);
}
boost::mutex::scoped_lock lock(mutex_);
queue_.Enqueue(command);
remainingCommands_++;
totalCommands_++;
}
bool ThreadedCommandProcessor::Join()
{
boost::mutex::scoped_lock lock(mutex_);
while (!remainingCommands_ == 0)
{
processedCommand_.wait(lock);
}
if (cancel_ && listener_)
{
listener_->SignalCancel();
}
// Reset the sequence counters for subsequent commands
bool hasSucceeded = success_;
success_ = true;
totalCommands_ = 0;
cancel_ = false;
return hasSucceeded;
}
void ThreadedCommandProcessor::Cancel()
{
boost::mutex::scoped_lock lock(mutex_);
cancel_ = true;
}
void ThreadedCommandProcessor::SetListener(IListener& listener)
{
boost::mutex::scoped_lock lock(mutex_);
listener_ = &listener;
}
}
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