1 /* Copyright (c) 2012-2016. 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. */
7 #include "routing_table.h"
9 #include "simgrid/msg.h"
11 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_kademlia_routing_table, "Messages specific for this msg example");
13 /** @brief Initialization of a node routing table. */
14 routing_table_t routing_table_init(unsigned int node_id)
17 routing_table_t table = xbt_new(s_routing_table_t, 1);
18 table->buckets = xbt_new(s_bucket_t, identifier_size + 1);
19 for (i = 0; i < identifier_size + 1; i++) {
20 table->buckets[i].nodes = xbt_dynar_new(sizeof(unsigned int), NULL);
21 table->buckets[i].id = i;
27 /** @brief Frees the routing table */
28 void routing_table_free(routing_table_t table)
32 for (i = 0; i <= identifier_size; i++) {
33 xbt_dynar_free(&table->buckets[i].nodes);
35 xbt_free(table->buckets);
39 /** Returns if the routing table contains the id. */
40 unsigned int routing_table_contains(routing_table_t table, unsigned int node_id)
42 bucket_t bucket = routing_table_find_bucket(table, node_id);
43 return bucket_contains(bucket, node_id);
46 /**@brief prints the routing table, to debug stuff. */
47 void routing_table_print(routing_table_t table)
49 unsigned int i, j, value;
50 XBT_INFO("Routing table of %08x:", table->id);
52 for (i = 0; i <= identifier_size; i++) {
53 if (!xbt_dynar_is_empty(table->buckets[i].nodes)) {
54 XBT_INFO("Bucket number %d: ", i);
55 xbt_dynar_foreach(table->buckets[i].nodes, j, value) {
56 XBT_INFO("Element %d: %08x", j, value);
62 /** @brief Finds an identifier in a bucket and returns its position or returns -1 if it doesn't exists
63 * @param bucket the bucket in which we try to find our identifier
66 unsigned int bucket_find_id(bucket_t bucket, unsigned int id)
68 unsigned int i, current_id;
69 xbt_dynar_foreach(bucket->nodes, i, current_id){
70 if (id == current_id){
77 /** Returns if the bucket contains an identifier. */
78 unsigned int bucket_contains(bucket_t bucket, unsigned int id)
80 return xbt_dynar_member(bucket->nodes, &id);
83 /** @brief Finds the corresponding bucket in a routing table for a given identifier
84 * @param table the routing table
85 * @param id the identifier
86 * @return the bucket in which the the identifier would be.
88 bucket_t routing_table_find_bucket(routing_table_t table, unsigned int id)
90 unsigned int xor_number = table->id ^ id;
91 unsigned int prefix = get_node_prefix(xor_number, identifier_size);
92 xbt_assert(prefix >= 0 && prefix <= identifier_size, "Tried to return a bucket that doesn't exist.");
93 bucket_t bucket = &table->buckets[prefix];