1 /* Copyright (c) 2012-2013. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "routing_table.h"
10 #include "xbt/asserts.h"
11 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_kademlia_routing_table,
12 "Messages specific for this msg example");
14 * \brief Initialization of a node routing table.
16 routing_table_t routing_table_init(unsigned int node_id)
19 routing_table_t table = xbt_new(s_routing_table_t, 1);
20 table->buckets = xbt_new(s_bucket_t, identifier_size + 1);
21 for (i = 0; i < identifier_size + 1; i++) {
22 table->buckets[i].nodes = xbt_dynar_new(sizeof(unsigned int), NULL);
23 table->buckets[i].id = i;
30 * \brief Frees the routing table
32 void routing_table_free(routing_table_t table)
36 for (i = 0; i <= identifier_size; i++) {
37 xbt_dynar_free(&table->buckets[i].nodes);
39 xbt_free(table->buckets);
44 * Returns if the routing table contains the id.
46 unsigned int routing_table_contains(routing_table_t table, unsigned int node_id)
48 bucket_t bucket = routing_table_find_bucket(table, node_id);
49 return bucket_contains(bucket, node_id);
53 * @brief prints the routing table, to debug stuff.
55 void routing_table_print(routing_table_t table)
57 unsigned int i, j, value;
58 XBT_INFO("Routing table of %08x:", table->id);
60 for (i = 0; i <= identifier_size; i++) {
61 if (!xbt_dynar_is_empty(table->buckets[i].nodes)) {
62 XBT_INFO("Bucket number %d: ", i);
63 xbt_dynar_foreach(table->buckets[i].nodes, j, value) {
64 XBT_INFO("Element %d: %08x", j, value);
71 * Finds an identifier in a bucket and returns its position
72 * or returns -1 if it doesn't exists
73 * @param bucket the bucket in which we try to find our identifier
76 unsigned int bucket_find_id(bucket_t bucket, unsigned int id)
78 unsigned int i, length = xbt_dynar_length(bucket->nodes);
79 for (i = 0; i < length; i++) { //TODO: Use foreach maybe ?
80 if (id == xbt_dynar_get_as(bucket->nodes, i, unsigned int)) {
88 * Returns if the bucket contains an identifier.
90 unsigned int bucket_contains(bucket_t bucket, unsigned int id)
92 unsigned int length = xbt_dynar_length(bucket->nodes), i = 0;
93 for (i = 0; i < length; i++) {
94 if (id == xbt_dynar_get_as(bucket->nodes, i, unsigned int)) {
102 * Fins the corresponding bucket in a routing table for a given identifier
103 * @param table the routing table
104 * @param id the identifier
105 * @return the bucket in which the the identifier would be.
107 bucket_t routing_table_find_bucket(routing_table_t table, unsigned int id)
109 unsigned int xor_number = table->id ^ id;
110 unsigned int prefix = get_node_prefix(xor_number, identifier_size);
111 xbt_assert(prefix >= 0
112 && prefix <= identifier_size,
113 "Tried to return a bucket that doesn't exist.");
114 bucket_t bucket = &table->buckets[prefix];