node.h 2.52 KB
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/*
Marcus Winter committed
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 * Copyright (c) 2014-2016, Siemens AG. All rights reserved.
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 *
 * 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_NODE_H_
#define EMBB_DATAFLOW_INTERNAL_NODE_H_

#include <cstddef>
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#include <embb/base/exceptions.h>
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#include <embb/dataflow/internal/scheduler.h>
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#include <embb/dataflow/internal/clock_listener.h>
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namespace embb {
namespace dataflow {
namespace internal {

class Node {
 public:
  Node() : sched_(NULL) {}
  virtual ~Node() {}
  virtual bool HasInputs() const { return false; }
  virtual bool HasOutputs() const { return false; }
  virtual void Run(int clock) = 0;
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  virtual bool IsFullyConnected() = 0;
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  virtual bool IsSequential() { return true; }
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  virtual bool HasCycle() { return false; }
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  virtual bool Start(int /*clock*/) {
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    EMBB_THROW(embb::base::ErrorException,
      "Nodes are started implicitly.");
  }
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  void SetScheduler(Scheduler * sched) {
    sched_ = sched;
    if (NULL != sched_) {
      SetSlices(sched_->GetSlices());
    } else {
      SetSlices(0);
    }
  }
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 protected:
  Scheduler * sched_;
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  static int next_process_id_;

  static int GetNextProcessID() { return next_process_id_++; }
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  virtual void SetSlices(int /*slices*/) {}
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};

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

#endif // EMBB_DATAFLOW_INTERNAL_NODE_H_