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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_CONNECTION_H
#define CEPH_CONNECTION_H
#include <stdlib.h>
#include <ostream>
#include <boost/intrusive_ptr.hpp>
// Because intusive_ptr clobbers our assert...
#include "include/assert.h"
#include "include/types.h"
#include "include/buffer.h"
#include "common/RefCountedObj.h"
#include "common/debug.h"
#include "common/config.h"
// ======================================================
// abstract Connection, for keeping per-connection state
class Message;
class Messenger;
struct Connection : public RefCountedObject {
mutable Mutex lock;
Messenger *msgr;
RefCountedObject *priv;
int peer_type;
entity_addr_t peer_addr;
utime_t last_keepalive, last_keepalive_ack;
private:
uint64_t features;
public:
bool failed; // true if we are a lossy connection that has failed.
int rx_buffers_version;
map<ceph_tid_t,pair<bufferlist,int> > rx_buffers;
friend class boost::intrusive_ptr<Connection>;
friend class PipeConnection;
public:
Connection(CephContext *cct, Messenger *m)
// we are managed exlusively by ConnectionRef; make it so you can
// ConnectionRef foo = new Connection;
: RefCountedObject(cct, 0),
lock("Connection::lock"),
msgr(m),
priv(NULL),
peer_type(-1),
features(0),
failed(false),
rx_buffers_version(0) {
}
virtual ~Connection() {
//generic_dout(0) << "~Connection " << this << dendl;
if (priv) {
//generic_dout(0) << "~Connection " << this << " dropping priv " << priv << dendl;
priv->put();
}
}
void set_priv(RefCountedObject *o) {
Mutex::Locker l(lock);
if (priv)
priv->put();
priv = o;
}
RefCountedObject *get_priv() {
Mutex::Locker l(lock);
if (priv)
return priv->get();
return NULL;
}
/**
* Used to judge whether this connection is ready to send. Usually, the
* implementation need to build a own shakehand or sesson then it can be
* ready to send.
*
* @return true if ready to send, or false otherwise
*/
virtual bool is_connected() = 0;
Messenger *get_messenger() {
return msgr;
}
/**
* Queue the given Message to send out on the given Connection.
* Success in this function does not guarantee Message delivery, only
* success in queueing the Message. Other guarantees may be provided based
* on the Connection policy.
*
* @param m The Message to send. The Messenger consumes a single reference
* when you pass it in.
*
* @return 0 on success, or -errno on failure.
*/
virtual int send_message(Message *m) = 0;
/**
* Send a "keepalive" ping along the given Connection, if it's working.
* If the underlying connection has broken, this function does nothing.
*
* @return 0, or implementation-defined error numbers.
*/
virtual void send_keepalive() = 0;
/**
* Mark down the given Connection.
*
* This will cause us to discard its outgoing queue, and if reset
* detection is enabled in the policy and the endpoint tries to
* reconnect they will discard their queue when we inform them of
* the session reset.
*
* It does not generate any notifications to the Dispatcher.
*/
virtual void mark_down() = 0;
/**
* Mark a Connection as "disposable", setting it to lossy
* (regardless of initial Policy). This does not immediately close
* the Connection once Messages have been delivered, so as long as
* there are no errors you can continue to receive responses; but it
* will not attempt to reconnect for message delivery or preserve
* your old delivery semantics, either.
*
* TODO: There's some odd stuff going on in our SimpleMessenger
* implementation during connect that looks unused; is there
* more of a contract that that's enforcing?
*/
virtual void mark_disposable() = 0;
int get_peer_type() const { return peer_type; }
void set_peer_type(int t) { peer_type = t; }
bool peer_is_mon() const { return peer_type == CEPH_ENTITY_TYPE_MON; }
bool peer_is_mds() const { return peer_type == CEPH_ENTITY_TYPE_MDS; }
bool peer_is_osd() const { return peer_type == CEPH_ENTITY_TYPE_OSD; }
bool peer_is_client() const { return peer_type == CEPH_ENTITY_TYPE_CLIENT; }
const entity_addr_t& get_peer_addr() const { return peer_addr; }
void set_peer_addr(const entity_addr_t& a) { peer_addr = a; }
uint64_t get_features() const { return features; }
bool has_feature(uint64_t f) const { return features & f; }
void set_features(uint64_t f) { features = f; }
void set_feature(uint64_t f) { features |= f; }
void post_rx_buffer(ceph_tid_t tid, bufferlist& bl) {
Mutex::Locker l(lock);
++rx_buffers_version;
rx_buffers[tid] = pair<bufferlist,int>(bl, rx_buffers_version);
}
void revoke_rx_buffer(ceph_tid_t tid) {
Mutex::Locker l(lock);
rx_buffers.erase(tid);
}
utime_t get_last_keepalive() const {
Mutex::Locker l(lock);
return last_keepalive;
}
void set_last_keepalive(utime_t t) {
Mutex::Locker l(lock);
last_keepalive = t;
}
utime_t get_last_keepalive_ack() const {
Mutex::Locker l(lock);
return last_keepalive_ack;
}
void set_last_keepalive_ack(utime_t t) {
Mutex::Locker l(lock);
last_keepalive_ack = t;
}
};
typedef boost::intrusive_ptr<Connection> ConnectionRef;
#endif /* CEPH_CONNECTION_H */
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