constant_source.h

/*
 * Copyright (c) 2014-2015, Siemens AG. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef EMBB_DATAFLOW_INTERNAL_CONSTANT_SOURCE_H_
#define EMBB_DATAFLOW_INTERNAL_CONSTANT_SOURCE_H_

#include <embb/dataflow/internal/signal.h>
#include <embb/dataflow/internal/node.h>
#include <embb/dataflow/internal/outputs.h>

namespace embb {
namespace dataflow {
namespace internal {

template <typename Type>
class ConstantSource
  : public Node {
 public:
  typedef Outputs<Type> OutputsType;

 private:
  OutputsType outputs_;
  Type value_;

 public:
  explicit ConstantSource(Type value) : value_(value) {}

  virtual bool HasOutputs() const {
    return outputs_.Size() > 0;
  }

  virtual void Run(int clock) {
    GetOutput<0>().Send(Signal<Type>(clock, value_));
  }

  virtual void Init(InitData * init_data) {
    SetScheduler(init_data->sched);
    GetOutput<0>().SendInit(init_data);
  }

  virtual bool Start(int clock) {
    Run(clock);
    return true;
  }

  OutputsType & GetOutputs() {
    return outputs_;
  }

  template <int Index>
  typename TypeAt<typename OutputsType::Types, Index>::Result & GetOutput() {
    return outputs_.template Get<Index>();
  }

  template <typename T>
  void operator >> (T & target) {
    GetOutput<0>() >> target.template GetInput<0>();
  }
};

} // namespace internal
} // namespace dataflow
} // namespace embb

#endif // EMBB_DATAFLOW_INTERNAL_CONSTANT_SOURCE_H_