source: source/ariba/overlay/modules/chord/Chord.h@ 5785

Last change on this file since 5785 was 5756, checked in by mies, 15 years ago
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1// [License]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
6// Institute of Telematics
7// UniversitÀt Karlsruhe (TH)
8// Zirkel 2, 76128 Karlsruhe
9// Germany
10//
11// Redistribution and use in source and binary forms, with or without
12// modification, are permitted provided that the following conditions are
13// met:
14//
15// 1. Redistributions of source code must retain the above copyright
16// notice, this list of conditions and the following disclaimer.
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
22// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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30// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33// The views and conclusions contained in the software and documentation
34// are those of the authors and should not be interpreted as representing
35// official policies, either expressed or implied, of the Institute of
36// Telematics.
37// [License]
38
39#ifndef CHORD_H_
40#define CHORD_H_
41
42#include "ariba/utility/system/Timer.h"
43#include "ariba/utility/logging/Logging.h"
44#include "ariba/communication/EndpointDescriptor.h"
45#include "../OverlayInterface.h"
46#include <vector>
47
48class chord_routing_table;
49
50namespace ariba {
51namespace overlay {
52
53using ariba::communication::EndpointDescriptor;
54using ariba::utility::Timer;
55
56using namespace std;
57
58/**
59 * This class implements a structured overlay inspired by chord.
60 * It differs to the original form of chord in the following manner:
61 *
62 * (1) The graph is bidirectional
63 * (2) Stabilization is done in a reactive manner
64 *
65 * It therefore can be considered as a kind of Chorded-Kademlia :)
66 *
67 * The resulting overlay graph has a diameter of O(log N).
68 *
69 * @author Sebastian Mies <mies@tm.uka.de>
70 */
71class Chord : public OverlayInterface, protected Timer {
72 use_logging_h( Chord );
73private:
74 chord_routing_table* table;
75 int orphan_removal_counter;
76 int stabilize_counter;
77 int stabilize_finger;
78 vector<LinkID> bootstrapLinks;
79 vector<NodeID> pending;
80 int discovery_count;
81
82 class back_route {
83 public:
84 NodeID id;
85 LinkID link;
86 time_t lastseen;
87 };
88 vector<back_route> back_routes;
89
90 const LinkID& get_next_hop( const NodeID& id ) const;
91
92 // helper: sets up a link using the "base overlay"
93 LinkID setup( const EndpointDescriptor& endp,
94 const NodeID& node = NodeID::UNSPECIFIED,
95 const NodeID& remoteRelay = NodeID::UNSPECIFIED );
96
97 // helper: sends a message using the "base overlay"
98 seqnum_t send( Message* msg, const LinkID& link );
99
100 // stabilization: sends a discovery message to the specified neighborhood
101 void send_discovery_to( const NodeID& destination, int ttl = 3 );
102
103 void discover_neighbors( const LinkID& lnk );
104
105public:
106 Chord(BaseOverlay& _baseoverlay, const NodeID& _nodeid,
107 OverlayStructureEvents* _eventsReceiver, const OverlayParameterSet& param);
108 virtual ~Chord();
109
110 /// @see OverlayInterface.h
111 virtual const LinkID& getNextLinkId( const NodeID& id ) const;
112
113 /// @see OverlayInterface.h
114 virtual void createOverlay();
115
116 /// @see OverlayInterface.h
117 virtual void deleteOverlay();
118
119 /// @see OverlayInterface.h
120 virtual void joinOverlay(
121 const EndpointDescriptor& boot = EndpointDescriptor::UNSPECIFIED()
122 );
123
124 /// @see OverlayInterface.h
125 virtual void leaveOverlay();
126
127 /// @see OverlayInterface.h
128 virtual const EndpointDescriptor& resolveNode( const NodeID& node );
129
130 /// @see OverlayInterface.h
131 virtual void routeMessage( const NodeID& destnode, Message* msg );
132
133 /// @see OverlayInterface.h
134 virtual void routeMessage(const NodeID& node, const LinkID& link, Message* msg);
135
136 /// @see OverlayInterface.h
137 virtual NodeList getKnownNodes(bool deep = true) const;
138
139 /// @see CommunicationListener.h or @see OverlayInterface.h
140 virtual void onLinkUp(const LinkID& lnk, const NodeID& remote);
141
142 /// @see CommunicationListener.h or @see OverlayInterface.h
143 virtual void onLinkDown(const LinkID& lnk, const NodeID& remote);
144
145 /// @see CommunicationListener.h or @see OverlayInterface.h
146 virtual void onMessage(const DataMessage& msg, const NodeID& remote,
147 const LinkID& lnk = LinkID::UNSPECIFIED);
148
149
150
151 /// @see Timer.h
152 virtual void eventFunction();
153};
154
155}}
156
157#endif /* CHORD_H_ */
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