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-rw-r--r--examples/ASX/Event_Server/Event_Server/Peer_Router.h69
1 files changed, 42 insertions, 27 deletions
diff --git a/examples/ASX/Event_Server/Event_Server/Peer_Router.h b/examples/ASX/Event_Server/Event_Server/Peer_Router.h
index d9b7021f726..3369fe6415f 100644
--- a/examples/ASX/Event_Server/Event_Server/Peer_Router.h
+++ b/examples/ASX/Event_Server/Event_Server/Peer_Router.h
@@ -16,10 +16,10 @@ class Peer_Router;
class Peer_Router_Context;
class Peer_Handler : public ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_SYNCH>
+{
// = TITLE
// Receive input from a Peer and forward to the appropriate
- // <Peer_Router>.
-{
+ // <Peer_Router> (i.e., <Consumer_Router> or <Supplier_Router>).
public:
Peer_Handler (Peer_Router_Context * = 0);
// Initialization method.
@@ -29,28 +29,34 @@ public:
// object.
virtual int handle_input (ACE_HANDLE);
- // Receive input from the peer.
+ // Receive input from a peer.
virtual int put (ACE_Message_Block *, ACE_Time_Value *tv = 0);
- // Send output to a peer.
+ // Send output to a peer. Note that this implementation "blocks" if
+ // flow control occurs. This is undesirable for "real"
+ // applications. The best way around this is to make the
+ // <Peer_Handler> an Active Object, e.g., as done in the
+ // $ACE_ROOT/apps/Gateway/Gateway application.
protected:
- Peer_Router_Context *prc_;
- // Pointer to router context.
+ Peer_Router_Context *peer_router_context_;
+ // Pointer to router context. This maintains the state that is
+ // shared by both Tasks in a <Peer_Router> Module.
};
class Peer_Router_Context : public ACE_Acceptor<Peer_Handler, ACE_SOCK_ACCEPTOR>
+{
// = TITLE
// Defines state and behavior shared between both Tasks in a
- // Peer_Router Module.
+ // <Peer_Router> Module.
//
// = DESCRIPTION
- // This class also serves as an Acceptor, which creates
- // Peer_Handlers when Peers connect.
-{
+ // This class also serves as an <ACE_Acceptor>, which creates
+ // <Peer_Handlers> when Peers connect.
public:
// = Initialization and termination methods.
Peer_Router_Context (u_short port);
+ // Constructor.
virtual int unbind_peer (ROUTING_KEY);
// Remove the <Peer_Handler *> from the <PEER_MAP> that corresponds
@@ -61,29 +67,37 @@ public:
// <ROUTING_KEY>.
int send_peers (ACE_Message_Block *mb);
- // Send the <ACE_Message_Block> to the peer(s).
+ // Send the <ACE_Message_Block> to all the peers. Note that in a
+ // "real" application this logic would most likely be more
+ // selective, i.e., it would actually do "routing" based on
+ // addressing information passed in the <ACE_Message_Block>.
int make_svc_handler (Peer_Handler *&sh);
- // Create a new <Peer_Handler> for each connection.
+ // Factory Method that creates a new <Peer_Handler> for each
+ // connection. This method overrides the default behavior in
+ // <ACE_Acceptor>.
// = Set/Get Router Task.
- Peer_Router *peer_router ();
+ Peer_Router *peer_router (void);
void peer_router (Peer_Router *);
void release (void);
// Decrement the reference count and delete <this> when count == 0;
void duplicate (void);
- // Increment the reference count
+ // Increment the reference count.
private:
Peer_Router *peer_router_;
// Pointer to the <Peer_Router> that we are accepting for.
- // = Useful typedefs
- typedef ACE_Map_Manager <ROUTING_KEY, Peer_Handler *, ACE_SYNCH_RW_MUTEX> PEER_MAP;
- typedef ACE_Map_Iterator<ROUTING_KEY, Peer_Handler *, ACE_SYNCH_RW_MUTEX> PEER_ITERATOR;
- typedef ACE_Map_Entry<ROUTING_KEY, Peer_Handler *> PEER_ENTRY;
+ // = Useful typedefs.
+ typedef ACE_Map_Manager <ROUTING_KEY, Peer_Handler *, ACE_SYNCH_RW_MUTEX>
+ PEER_MAP;
+ typedef ACE_Map_Iterator<ROUTING_KEY, Peer_Handler *, ACE_SYNCH_RW_MUTEX>
+ PEER_ITERATOR;
+ typedef ACE_Map_Entry<ROUTING_KEY, Peer_Handler *>
+ PEER_ENTRY;
PEER_MAP peer_map_;
// Map used to keep track of active peers.
@@ -95,21 +109,22 @@ private:
// Private to ensure dynamic allocation.
friend class Friend_Of_Peer_Router_Context;
- // declare a friend class to avoid compiler warnings because the
+ // Declare a friend class to avoid compiler warnings because the
// destructor is private.
};
class Peer_Router : public ACE_Task<ACE_SYNCH>
+{
// = TITLE
// This abstract base class provides mechanisms for routing
- // messages to/from a ACE_Stream from/to one or more peers (which
+ // messages to/from a <ACE_Stream> from/to one or more peers (which
// are typically running on remote hosts).
//
// = DESCRIPTION
- // A subclass of Peer_Router overrides the open(), close(), and
- // put() methods in order to specialize the behavior of the router
- // to meet application-specific requirements.
-{
+ // Subclasses of <Peer_Router> (such as <Consumer_Router> or
+ // <Supplier_Router>) override the <open>, <close>, and
+ // <put> methods to specialize the behavior of the router to
+ // meet application-specific requirements.
protected:
Peer_Router (Peer_Router_Context *prc);
// Initialization method.
@@ -124,9 +139,9 @@ protected:
// Helpful typedef.
private:
- Peer_Router_Context *prc_;
- // Reference to the context shared by the writer and reader Tasks in
- // the Consumer and Supplier Modules.
+ Peer_Router_Context *peer_router_context_;
+ // Reference to the context shared by the writer and reader Tasks,
+ // e.g., in the <Consumer_Router> and <Supplier_Router> Modules.
// = Prevent copies and pass-by-value.
Peer_Router (const Peer_Router &);