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/**************************************************************
*
* 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.
*
*************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sd.hxx"
#include "tools/TimerBasedTaskExecution.hxx"
#include "tools/AsynchronousTask.hxx"
#include <tools/time.hxx>
#include <osl/diagnose.h>
#include <boost/weak_ptr.hpp>
#undef VERBOSE
namespace sd { namespace tools {
/** Used by the shared_ptr instead of the private destructor.
*/
class TimerBasedTaskExecution::Deleter
{
public:
void operator() (TimerBasedTaskExecution* pObject)
{
delete pObject;
}
};
::boost::shared_ptr<TimerBasedTaskExecution> TimerBasedTaskExecution::Create (
const ::boost::shared_ptr<AsynchronousTask>& rpTask,
sal_uInt32 nMillisecondsBetweenSteps,
sal_uInt32 nMaxTimePerStep)
{
::boost::shared_ptr<TimerBasedTaskExecution> pExecution(
new TimerBasedTaskExecution(rpTask,nMillisecondsBetweenSteps,nMaxTimePerStep),
Deleter());
// Let the new object have a shared_ptr to itself, so that it can
// release itself when the AsynchronousTask has been executed
// completely.
pExecution->SetSelf(pExecution);
return pExecution;
}
void TimerBasedTaskExecution::Release (void)
{
maTimer.Stop();
mpSelf.reset();
}
//static
void TimerBasedTaskExecution::ReleaseTask (
const ::boost::weak_ptr<TimerBasedTaskExecution>& rpExecution)
{
if ( ! rpExecution.expired())
{
try
{
::boost::shared_ptr<tools::TimerBasedTaskExecution> pExecution (rpExecution);
pExecution->Release();
}
catch (::boost::bad_weak_ptr)
{
// When a bad_weak_ptr has been thrown then the object pointed
// to by rpTask has been released right after we checked that it
// still existed. Too bad, but that means, that we have nothing
// more do.
}
}
}
TimerBasedTaskExecution::TimerBasedTaskExecution (
const ::boost::shared_ptr<AsynchronousTask>& rpTask,
sal_uInt32 nMillisecondsBetweenSteps,
sal_uInt32 nMaxTimePerStep)
: mpTask(rpTask),
maTimer(),
mpSelf(),
mnMaxTimePerStep(nMaxTimePerStep)
{
Link aLink(LINK(this,TimerBasedTaskExecution,TimerCallback));
maTimer.SetTimeoutHdl(aLink);
maTimer.SetTimeout(nMillisecondsBetweenSteps);
maTimer.Start();
}
TimerBasedTaskExecution::~TimerBasedTaskExecution (void)
{
maTimer.Stop();
}
void TimerBasedTaskExecution::SetSelf (
const ::boost::shared_ptr<TimerBasedTaskExecution>& rpSelf)
{
if (mpTask.get() != NULL)
mpSelf = rpSelf;
}
IMPL_LINK(TimerBasedTaskExecution,TimerCallback, Timer*,EMPTYARG)
{
if (mpTask.get() != NULL)
{
if (mpTask->HasNextStep())
{
// Execute as many steps as fit into the time span of length
// mnMaxTimePerStep. Note that the last step may take longer
// than allowed.
sal_uInt32 nStartTime (Time().GetMSFromTime());
#ifdef VERBOSE
OSL_TRACE("starting TimerBasedTaskExecution at %d", nStartTime);
#endif
do
{
mpTask->RunNextStep();
sal_uInt32 nDuration (Time().GetMSFromTime()-nStartTime);
#ifdef VERBOSE
OSL_TRACE("executed step in %d", nDuration);
#endif
if (nDuration > mnMaxTimePerStep)
break;
}
while (mpTask->HasNextStep());
#ifdef VERBOSE
OSL_TRACE("TimerBasedTaskExecution sleeping");
#endif
maTimer.Start();
}
else
mpSelf.reset();
}
return 0;
}
} } // end of namespace ::sd::tools
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