3 * Copyright 2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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8 * it under the terms of the GNU General Public License as published by
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
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18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #ifndef INCLUDED_MB_MBLOCK_H
22 #define INCLUDED_MB_MBLOCK_H
24 #include <mb_common.h>
25 #include <mb_message.h>
27 #include <boost/enable_shared_from_this.hpp>
31 * Abstract class implementing visitor pattern
37 virtual ~mb_visitor();
38 bool operator()(mb_mblock *mblock, const std::string &path) { return visit(mblock, path); }
39 virtual bool visit(mb_mblock *mblock, const std::string &path) = 0;
42 // ----------------------------------------------------------------------
45 * \brief Parent class for all message passing blocks
47 * Subclass this to define your mblocks.
49 class mb_mblock : boost::noncopyable,
50 public boost::enable_shared_from_this<mb_mblock>
53 mb_mblock_impl_sptr d_impl; // implementation details
55 friend class mb_runtime;
56 friend class mb_mblock_impl;
60 * \brief mblock constructor.
62 * Initializing all mblocks in the system is a 3 step procedure.
64 * The top level mblock's constructor is run. That constructor (a)
65 * registers all of its ports using define_port, (b) constructs and
66 * registers any subcomponents it may have via the define_component
67 * method, and then (c) issues connect calls to wire its
68 * subcomponents together.
73 * \brief Called by the runtime system to execute the initial
74 * transition of the finite state machine.
76 * Override this to initialize your finite state machine.
78 virtual void init_fsm();
81 * \brief Called by the runtime system when there's a message to handle.
83 * Override this to define your behavior.
85 * Do not issue any potentially blocking calls in this method. This
86 * includes things such reads or writes on sockets, pipes or slow
89 virtual void handle_message(mb_message_sptr msg);
92 * \brief Define a port.
94 * EXTERNAL and RELAY ports are part of our peer interface.
95 * INTERNAL ports are used to talk to sub-components.
97 * \param port_name The name of the port (must be unique within this mblock).
98 * \param protocol_class_name The name of the protocol class associated with
99 * this port. It must already be defined.
100 * \param conjugated Are the incoming and outgoing message sets swapped?
101 * \param port_type INTERNAL, EXTERNAL or RELAY.
104 define_port(const std::string &port_name,
105 const std::string &protocol_class_name,
107 mb_port::port_type_t port_type);
110 * \brief Define a subcomponent by name.
112 * Called within the constructor to tell the system the
113 * names and identities of our sub-component mblocks.
115 * \param component_name The name of the sub-component (must be unique with this mblock).
116 * \param component The sub-component instance.
119 define_component(const std::string &component_name,
120 mb_mblock_sptr component);
123 * \brief connect endpoint_1 to endpoint_2
125 * \param comp_name1 component on one end of the connection
126 * \param port_name1 the name of the port on comp1
127 * \param comp_name2 component on the other end of the connection
128 * \param port_name2 the name of the port on comp2
130 * An endpoint is specified by the component's local name (given as
131 * component_name in the call to register_component) and the name of
132 * the port on that component.
134 * To connect an internal or relay port, use "self" as the component name.
137 connect(const std::string &comp_name1, const std::string &port_name1,
138 const std::string &comp_name2, const std::string &port_name2);
141 * \brief disconnect endpoint_1 from endpoint_2
143 * \param comp_name1 component on one end of the connection
144 * \param port_name1 the name of the port on comp1
145 * \param comp_name2 component on the other end of the connection
146 * \param port_name2 the name of the port on comp2
148 * An endpoint is specified by the component's local name (given as
149 * component_name in the call to register_component) and the name of
150 * the port on that component.
152 * To disconnect an internal or relay port, use "self" as the component name.
155 disconnect(const std::string &comp_name1, const std::string &port_name1,
156 const std::string &comp_name2, const std::string &port_name2);
159 * \brief disconnect all connections to specified component
160 * \param component_name component to disconnect
163 disconnect_component(const std::string component_name);
166 * \brief disconnect all connections to all components
172 * \brief Return number of connections (QA mostly)
175 nconnections() const;
179 virtual ~mb_mblock();
182 * \brief Perform a pre-order depth-first traversal of the hierarchy.
184 * The traversal stops and returns false if any call to visitor returns false.
187 walk_tree(mb_visitor *visitor, const std::string &path="");
193 impl() const { return d_impl; }
198 #endif /* INCLUDED_MB_MBLOCK_H */