text: /*
   * AbstractTimedResourceStream.cpp
   *
   * Copyright (C) 2020 by RStudio, PBC
   *
   * Unless you have received this program directly from RStudio pursuant to the terms of a commercial license agreement
   * with RStudio, then this program is licensed to you under the following terms:
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
   * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
   * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
   * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   */
  
  #include <api/stream/AbstractTimedResourceStream.hpp>
  
  #include <system/Asio.hpp>
  
  namespace rstudio {
  namespace launcher_plugins {
  namespace api {
  
  typedef std::shared_ptr<AbstractTimedResourceStream> SharedThis;
  typedef std::weak_ptr<AbstractTimedResourceStream> WeakThis;
  
  struct AbstractTimedResourceStream::Impl
  {
     explicit Impl(system::TimeDuration&& in_frequency) :
        Frequency(in_frequency)
     {
     }
  
     system::TimeDuration Frequency;
  
     system::AsyncTimedEvent TimedEvent;
  };
  
  PRIVATE_IMPL_DELETER_IMPL(AbstractTimedResourceStream);
  
  AbstractTimedResourceStream::~AbstractTimedResourceStream()
  {
     try
     {
        m_timedBaseImpl->TimedEvent.cancel();
     }
     catch (...)
     {
        // Swallow exceptions because destructors must not throw.
     }
  }
  
  AbstractTimedResourceStream::AbstractTimedResourceStream(
     system::TimeDuration in_frequency,
     const ConstJobPtr& in_job,
     comms::AbstractLauncherCommunicatorPtr in_launcherCommunicator) :
        AbstractResourceStream(in_job, in_launcherCommunicator),
        m_timedBaseImpl(new Impl(std::move(in_frequency)))
  {
  }
  
  Error AbstractTimedResourceStream::initialize()
  {
     Error error = onInitialize();
     if (error)
        return error;
  
     WeakThis weakThis = weak_from_this();
     system::AsioFunction onTimer = [weakThis]()
     {
        if (SharedThis sharedThis = weakThis.lock())
        {
           ResourceUtilData data;
           Error error = sharedThis->pollResourceUtilData(data);
           if (error)
           {
              // No need to report the error twice, but cancel the timed event on error.
              sharedThis->reportError(error);
              sharedThis->m_timedBaseImpl->TimedEvent.cancel();
           }
           else
              sharedThis->reportData(data);
        }
     };
  
     m_timedBaseImpl->TimedEvent.start(m_timedBaseImpl->Frequency, onTimer);
  
     return Success();
  }
  
  Error AbstractTimedResourceStream::onInitialize()
  {
     return Success();
  }
  
  } // namespace api 
  } // namespace launcher_plugins 
  } // namespace rstudio 
  