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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.
*
*************************************************************/
#ifndef SD_TIMER_BASED_TASK_EXECUTION_HXX
#define SD_TIMER_BASED_TASK_EXECUTION_HXX
#include <vcl/timer.hxx>
#include <boost/shared_ptr.hpp>
namespace sd { namespace tools {
class AsynchronousTask;
/** Execute an AsynchronousTask timer based, i.e. every
nMillisecondsBetweenSteps milliseconds as much steps are executed as fit
into a nMaxTimePerStep millisecond intervall.
When a task is executed completely, i.e. HasNextStep() returns <FALSE/>,
the TimerBasedTaskExecution destroys itself. This, of course, works
only if the creating instance does not hold a shared_ptr to that object.
*/
class TimerBasedTaskExecution
{
public:
/** Create a new object of this class.
@param rpTask
The AsynchronousTask that is to be executed.
@param nMillisecondsBetweenSteps
Wait at least this long between the execution of steps. Note
that more than one step may be executed in succession.
@param nMaxTimePerStep
The maximal time for executing steps without yielding control.
*/
static ::boost::shared_ptr<TimerBasedTaskExecution> Create (
const ::boost::shared_ptr<AsynchronousTask>& rpTask,
sal_uInt32 nMillisecondsBetweenSteps,
sal_uInt32 nMaxTimePerStep);
/** Stop the execution of the task and release the shared pointer to
itself so that it will eventually be destroyed.
*/
void Release (void);
/** Convenience method that calls Release() on the given task. It
checks the given weak_ptr for being expired and catches bad_weak_ptr
exceptions.
*/
static void ReleaseTask (const ::boost::weak_ptr<TimerBasedTaskExecution>& rpTask);
private:
::boost::shared_ptr<AsynchronousTask> mpTask;
Timer maTimer;
/** This shared_ptr to this is used to destroy a TimerBasedTaskExecution
object when its task has been executed completely.
*/
::boost::shared_ptr<TimerBasedTaskExecution> mpSelf;
sal_uInt32 mnMaxTimePerStep;
TimerBasedTaskExecution (
const ::boost::shared_ptr<AsynchronousTask>& rpTask,
sal_uInt32 nMillisecondsBetweenSteps,
sal_uInt32 nMaxTimePerStep);
~TimerBasedTaskExecution (void);
void SetSelf (const ::boost::shared_ptr<TimerBasedTaskExecution>& rpSelf);
class Deleter;
friend class Deleter;
DECL_LINK(TimerCallback,Timer*);
};
} } // end of namespace ::sd::tools
#endif
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