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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_MSG_DIRECTMESSENGER_H
#define CEPH_MSG_DIRECTMESSENGER_H
#include "msg/SimplePolicyMessenger.h"
#include "common/Semaphore.h"
class DispatchStrategy;
/**
* DirectMessenger provides a direct path between two messengers
* within a process. A pair of DirectMessengers share their
* DispatchStrategy with each other, and calls to send_message()
* forward the message directly to the other.
*
* This is for testing and i/o injection only, and cannot be used
* for normal messengers with ms_type.
*/
class DirectMessenger : public SimplePolicyMessenger {
private:
/// strategy for local dispatch
std::unique_ptr<DispatchStrategy> dispatchers;
/// peer instance for comparison in get_connection()
entity_inst_t peer_inst;
/// connection that sends to the peer's dispatchers
ConnectionRef peer_connection;
/// connection that sends to my own dispatchers
ConnectionRef loopback_connection;
/// semaphore for signalling wait() from shutdown()
Semaphore sem;
public:
DirectMessenger(CephContext *cct, entity_name_t name,
string mname, uint64_t nonce,
DispatchStrategy *dispatchers);
~DirectMessenger();
/// attach to a peer messenger. must be called before start()
int set_direct_peer(DirectMessenger *peer);
// Messenger interface
/// sets the addr. must not be called after set_direct_peer() or start()
int bind(const entity_addr_t& bind_addr) override;
/// sets the addr. must not be called after set_direct_peer() or start()
int client_bind(const entity_addr_t& bind_addr) override;
/// starts dispatchers
int start() override;
/// breaks connections, stops dispatchers, and unblocks callers of wait()
int shutdown() override;
/// blocks until shutdown() completes
void wait() override;
/// returns a connection to the peer instance, a loopback connection to our
/// own instance, or null if not connected
ConnectionRef get_connection(const entity_inst_t& dst) override;
/// returns a loopback connection that dispatches to this messenger
ConnectionRef get_loopback_connection() override;
/// dispatches a message to the peer instance if connected
int send_message(Message *m, const entity_inst_t& dst) override;
/// mark down the connection for the given address
void mark_down(const entity_addr_t& a) override;
/// mark down all connections
void mark_down_all() override;
// unimplemented Messenger interface
void set_addr_unknowns(const entity_addr_t &addr) override {}
void set_addr(const entity_addr_t &addr) override {}
int get_dispatch_queue_len() override { return 0; }
double get_dispatch_queue_max_age(utime_t now) override { return 0; }
void set_cluster_protocol(int p) override {}
};
#endif
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