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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_MESSENGER_H
#define CEPH_MESSENGER_H
#include <map>
using namespace std;
#include "Message.h"
#include "Dispatcher.h"
#include "common/Mutex.h"
#include "common/Cond.h"
#include "include/Context.h"
#include "include/types.h"
class MDS;
class Timer;
class Messenger {
private:
list<Dispatcher*> dispatchers;
protected:
entity_name_t _my_name;
int default_send_priority;
atomic_t nref;
public:
Messenger(entity_name_t w) : default_send_priority(CEPH_MSG_PRIO_DEFAULT),
nref(1) {
_my_name = w;
}
void get() {
nref.inc();
}
void put() {
if (nref.dec() == 0)
delete this;
}
virtual void destroy() {
put();
}
// accessors
entity_name_t get_myname() { return _my_name; }
virtual entity_addr_t get_myaddr() = 0;
entity_inst_t get_myinst() { return entity_inst_t(get_myname(), get_myaddr()); }
void set_myname(const entity_name_t m) { _my_name = m; }
void set_default_send_priority(int p) { default_send_priority = p; }
int get_default_send_priority() { return default_send_priority; }
// hrmpf.
virtual int get_dispatch_queue_len() { return 0; };
// setup
void add_dispatcher_head(Dispatcher *d) {
bool first = dispatchers.empty();
dispatchers.push_front(d);
if (first)
ready();
}
void add_dispatcher_tail(Dispatcher *d) {
bool first = dispatchers.empty();
dispatchers.push_back(d);
if (first)
ready();
}
virtual void ready() { }
bool is_ready() { return !dispatchers.empty(); }
// dispatch incoming messages
void ms_deliver_dispatch(Message *m) {
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
if ((*p)->ms_dispatch(m))
return;
generic_dout(0) << "unhandled message " << m << " " << *m
<< " from " << m->get_source_inst()
<< dendl;
assert(0);
}
void ms_deliver_handle_connect(Connection *con) {
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
(*p)->ms_handle_connect(con);
}
void ms_deliver_handle_reset(Connection *con) {
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
if ((*p)->ms_handle_reset(con))
return;
}
void ms_deliver_handle_remote_reset(Connection *con) {
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
(*p)->ms_handle_remote_reset(con);
}
AuthAuthorizer *ms_deliver_get_authorizer(int peer_type, bool force_new) {
AuthAuthorizer *a = 0;
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
if ((*p)->ms_get_authorizer(peer_type, &a, force_new))
return a;
return NULL;
}
bool ms_deliver_verify_authorizer(Connection *con, int peer_type,
int protocol, bufferlist& authorizer, bufferlist& authorizer_reply,
bool& isvalid) {
for (list<Dispatcher*>::iterator p = dispatchers.begin();
p != dispatchers.end();
p++)
if ((*p)->ms_verify_authorizer(con, peer_type, protocol, authorizer, authorizer_reply, isvalid))
return true;
return false;
}
// shutdown
virtual int shutdown() = 0;
virtual void suicide() = 0;
// send message
virtual void prepare_dest(const entity_inst_t& inst) {}
virtual int send_message(Message *m, const entity_inst_t& dest) = 0;
virtual int send_message(Message *m, Connection *con) = 0;
virtual int lazy_send_message(Message *m, const entity_inst_t& dest) {
return send_message(m, dest);
}
virtual int lazy_send_message(Message *m, Connection *con) = 0;
virtual int send_keepalive(const entity_inst_t& dest) = 0;
virtual void mark_down(const entity_addr_t& a) = 0;
protected:
//destruction should be handled via destroy()
virtual ~Messenger() {
assert(nref.read() == 0);
}
};
#endif
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