3 * Copyright 2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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21 #ifndef INCLUDED_MB_MBLOCK_H
22 #define INCLUDED_MB_MBLOCK_H
24 #include <mb_common.h>
25 #include <mb_message.h>
30 * Abstract class implementing visitor pattern
36 virtual ~mb_visitor();
37 bool operator()(mb_mblock *mblock, const std::string &path) { return visit(mblock, path); }
38 virtual bool visit(mb_mblock *mblock, const std::string &path) = 0;
41 // ----------------------------------------------------------------------
44 * \brief Parent class for all message passing blocks
46 * Subclass this to define your mblocks.
48 class mb_mblock : boost::noncopyable
51 mb_mblock_impl_sptr d_impl; // implementation details
53 friend class mb_runtime;
54 friend class mb_mblock_impl;
58 * \brief mblock constructor.
60 * Initializing all mblocks in the system is a 3 step procedure.
62 * The top level mblock's constructor is run. That constructor (a)
63 * registers all of its ports using define_port, (b) constructs and
64 * registers any subcomponents it may have via the define_component
65 * method, and then (c) issues connect calls to wire its
66 * subcomponents together.
71 * \brief Called by the runtime system to execute the initial
72 * transition of the finite state machine.
74 * Override this to initialize your finite state machine.
76 virtual void init_fsm();
79 * \brief Called by the runtime system when there's a message to handle.
81 * Override this to define your behavior.
83 * Do not issue any potentially blocking calls in this method. This
84 * includes things such reads or writes on sockets, pipes or slow
87 virtual void handle_message(mb_message_sptr msg);
90 * \brief Define a port.
92 * EXTERNAL and RELAY ports are part of our peer interface.
93 * INTERNAL ports are used to talk to sub-components.
95 * \param port_name The name of the port (must be unique within this mblock).
96 * \param protocol_class_name The name of the protocol class associated with
97 * this port. It must already be defined.
98 * \param conjugated Are the incoming and outgoing message sets swapped?
99 * \param port_type INTERNAL, EXTERNAL or RELAY.
102 define_port(const std::string &port_name,
103 const std::string &protocol_class_name,
105 mb_port::port_type_t port_type);
108 * \brief Define a subcomponent by name.
110 * Called within the constructor to tell the system the
111 * names and identities of our sub-component mblocks.
113 * \param component_name The name of the sub-component (must be unique with this mblock).
114 * \param component The sub-component instance.
117 define_component(const std::string &component_name,
118 mb_mblock_sptr component);
121 * \brief connect endpoint_1 to endpoint_2
123 * \param comp_name1 component on one of the connection
124 * \param port_name1 the name of the port on comp1
125 * \param comp_name2 component on the other end the connection
126 * \param port_name2 the name of the port on comp2
128 * An endpoint is specified by the component's local name (given as
129 * component_name in the call to register_component) and the name of
130 * the port on that component.
132 * To connect an internal or relay port, use "self" as the component name.
135 connect(const std::string &comp_name1, const std::string &port_name1,
136 const std::string &comp_name2, const std::string &port_name2);
139 * \brief disconnect endpoint_1 from endpoint_2
141 * \param comp_name1 component on one of the connection
142 * \param port_name1 the name of the port on comp1
143 * \param comp_name2 component on the other end the connection
144 * \param port_name2 the name of the port on comp2
146 * An endpoint is specified by the component's local name (given as
147 * component_name in the call to register_component) and the name of
148 * the port on that component.
150 * To disconnect an internal or relay port, use "self" as the component name.
153 disconnect(const std::string &comp_name1, const std::string &port_name1,
154 const std::string &comp_name2, const std::string &port_name2);
157 * \brief disconnect all connections to specified component
158 * \param component_name component to disconnect
161 disconnect_component(const std::string component_name);
164 * \brief disconnect all connections to all components
170 * \brief Return number of connections (QA mostly)
173 nconnections() const;
177 virtual ~mb_mblock();
180 * \brief Perform a pre-order depth-first traversal of the hierarchy.
182 * The traversal stops and returns false if any call to visitor returns false.
184 bool walk_tree(mb_visitor *visitor, const std::string &path="");
188 #endif /* INCLUDED_MB_MBLOCK_H */