message_debug.h

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/* -*- c++ -*- */
/*
 * Copyright 2005,2012-2013 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_MESSAGE_DEBUG_H
#define INCLUDED_GR_MESSAGE_DEBUG_H

#include <gnuradio/block.h>
#include <gnuradio/blocks/api.h>

namespace gr {
namespace blocks {

/*!
 * \brief Debug block for the message passing system.
 * \ingroup message_tools_blk
 * \ingroup measurement_tools_blk
 * \ingroup debug_tools_blk
 *
 * \details
 * The message debug block is used to capture and print or store
 * messages as they are received. Any block that generates a
 * message may connect that message port to one or more of the
 * three message input ports of this debug block. The message
 * ports are:
 *
 * \li print: prints the message directly to standard out.
 * \li store: stores the message in an internal vector. May be
 *            access using the get_message function.
 * \li print_pdu: specifically designed to handle formatted PDUs
 *                (see pdu.h).
 */
class BLOCKS_API message_debug : virtual public block
{
public:
    // gr::blocks::message_debug::sptr
    typedef boost::shared_ptr<message_debug> sptr;

    /*!
     * \brief Build the message debug block. It takes no parameters
     * and has three message ports: print, store, and
     * print_pdu.
     */
    static sptr make();

    /*!
     * \brief Reports the number of messages received by this block.
     */
    virtual int num_messages() = 0;

    /*!
     * \brief Get a message (as a PMT) from the message vector at index \p i.
     *
     * Messages passed to the 'store' port will be stored in a
     * vector. This function retrieves those messages by index. They
     * are index in order of when they were received (all messages
     * are just pushed onto the back of a vector). This is mostly
     * useful in debugging message passing graphs and in QA code.
     *
     * \param i The index in the vector for the message to retrieve.
     *
     * \return a message at index \p i as a pmt_t.
     */
    virtual pmt::pmt_t get_message(int i) = 0;
};

} /* namespace blocks */
} /* namespace gr */

#endif /* INCLUDED_GR_MESSAGE_DEBUG_H */