3 * Copyright 2006 Free Software Foundation, Inc.
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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>
27 #include <boost/enable_shared_from_this.hpp>
31 * Abstract class implementing visitor pattern
37 virtual ~mb_visitor();
38 virtual bool operator()(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,
49 public boost::enable_shared_from_this<mb_mblock>
52 mb_mblock_impl_sptr d_impl; // implementation details
54 friend class mb_runtime;
55 friend class mb_mblock_impl;
59 * \brief mblock constructor.
61 * Initializing all mblocks in the system is a 3 step procedure.
63 * The top level mblock's constructor is run. That constructor (a)
64 * registers all of its ports using define_port, (b) constructs and
65 * registers any subcomponents it may have via the define_component
66 * method, and then (c) issues connect calls to wire its
67 * 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();
82 * \brief Called by the runtime system when there's a message to handle.
84 * Override this to define your behavior.
86 * Do not issue any potentially blocking calls in this method. This
87 * includes things such reads or writes on sockets, pipes or slow
90 virtual void handle_message(mb_message_sptr msg);
93 * \brief Define a port.
95 * EXTERNAL and RELAY ports are part of our peer interface.
96 * INTERNAL ports are used to talk to sub-components.
98 * \param port_name The name of the port (must be unique within this mblock).
99 * \param protocol_class_name The name of the protocol class associated with
100 * this port. It must already be defined.
101 * \param conjugated Are the incoming and outgoing message sets swapped?
102 * \param port_type INTERNAL, EXTERNAL or RELAY.
105 define_port(const std::string &port_name,
106 const std::string &protocol_class_name,
108 mb_port::port_type_t port_type);
111 * \brief Define a subcomponent by name.
113 * Called within the constructor to tell the system the
114 * names and identities of our sub-component mblocks.
116 * \param component_name The name of the sub-component (must be unique with this mblock).
117 * \param component The sub-component instance.
120 define_component(const std::string &component_name,
121 mb_mblock_sptr component);
124 * \brief connect endpoint_1 to endpoint_2
126 * \param comp_name1 component on one end of the connection
127 * \param port_name1 the name of the port on comp1
128 * \param comp_name2 component on the other end of the connection
129 * \param port_name2 the name of the port on comp2
131 * An endpoint is specified by the component's local name (given as
132 * component_name in the call to register_component) and the name of
133 * the port on that component.
135 * To connect an internal or relay port, use "self" as the component name.
138 connect(const std::string &comp_name1, const std::string &port_name1,
139 const std::string &comp_name2, const std::string &port_name2);
142 * \brief disconnect endpoint_1 from endpoint_2
144 * \param comp_name1 component on one end of the connection
145 * \param port_name1 the name of the port on comp1
146 * \param comp_name2 component on the other end of the connection
147 * \param port_name2 the name of the port on comp2
149 * An endpoint is specified by the component's local name (given as
150 * component_name in the call to register_component) and the name of
151 * the port on that component.
153 * To disconnect an internal or relay port, use "self" as the component name.
156 disconnect(const std::string &comp_name1, const std::string &port_name1,
157 const std::string &comp_name2, const std::string &port_name2);
160 * \brief disconnect all connections to specified component
161 * \param component_name component to disconnect
164 disconnect_component(const std::string component_name);
167 * \brief disconnect all connections to all components
173 * \brief Return number of connections (QA mostly)
176 nconnections() const;
180 virtual ~mb_mblock();
182 void set_fullname(const std::string name);
184 //! Return full name of this block
185 std::string fullname() const;
187 //! Return the parent of this mblock, or 0 if we're the top-level block.
188 mb_mblock *parent() const;
191 * \brief Perform a pre-order depth-first traversal of the hierarchy.
193 * The traversal stops and returns false if any call to visitor returns false.
196 walk_tree(mb_visitor *visitor, const std::string &path="top");
202 impl() const { return d_impl; }
207 #endif /* INCLUDED_MB_MBLOCK_H */