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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include "avl.h"
#include "common.h"
#include "log.h"
#include "dictionary.h"
// ----------------------------------------------------------------------------
// name_value index
static int name_value_iterator(avl *a) { if(a) {}; return 0; }
static int name_value_compare(void* a, void* b) {
if(((NAME_VALUE *)a)->hash < ((NAME_VALUE *)b)->hash) return -1;
else if(((NAME_VALUE *)a)->hash > ((NAME_VALUE *)b)->hash) return 1;
else return strcmp(((NAME_VALUE *)a)->name, ((NAME_VALUE *)b)->name);
}
#define name_value_index_add(dict, cv) avl_insert(&((dict)->values_index), (avl *)(cv))
#define name_value_index_del(dict, cv) avl_remove(&((dict)->values_index), (avl *)(cv))
static NAME_VALUE *dictionary_name_value_index_find(DICTIONARY *dict, const char *name, uint32_t hash) {
NAME_VALUE *result = NULL, tmp;
tmp.hash = (hash)?hash:simple_hash(name);
tmp.name = (char *)name;
avl_search(&(dict->values_index), (avl *)&tmp, name_value_iterator, (avl **)&result);
return result;
}
// ----------------------------------------------------------------------------
static NAME_VALUE *dictionary_name_value_create(DICTIONARY *dict, const char *name, void *value, size_t value_len) {
debug(D_DICTIONARY, "Creating name value entry for name '%s', value '%s'.", name, value);
NAME_VALUE *nv = calloc(1, sizeof(NAME_VALUE));
if(!nv) {
fatal("Cannot allocate name_value of size %z", sizeof(NAME_VALUE));
exit(1);
}
nv->name = strdup(name);
if(!nv->name) fatal("Cannot allocate name_value.name of size %z", strlen(name));
nv->hash = simple_hash(nv->name);
nv->value = malloc(value_len);
if(!nv->value) fatal("Cannot allocate name_value.value of size %z", value_len);
memcpy(nv->value, value, value_len);
// link it
pthread_rwlock_wrlock(&dict->rwlock);
nv->next = dict->values;
dict->values = nv;
pthread_rwlock_unlock(&dict->rwlock);
// index it
name_value_index_add(dict, nv);
return nv;
}
static void dictionary_name_value_destroy(DICTIONARY *dict, NAME_VALUE *nv) {
debug(D_DICTIONARY, "Destroying name value entry for name '%s'.", nv->name);
pthread_rwlock_wrlock(&dict->rwlock);
if(dict->values == nv) dict->values = nv->next;
else {
NAME_VALUE *n = dict->values;
while(n && n->next && n->next != nv) nv = nv->next;
if(!n || n->next != nv) {
fatal("Cannot find name_value with name '%s' in dictionary.", nv->name);
exit(1);
}
n->next = nv->next;
nv->next = NULL;
}
pthread_rwlock_unlock(&dict->rwlock);
free(nv->value);
free(nv);
}
// ----------------------------------------------------------------------------
DICTIONARY *dictionary_create(void) {
debug(D_DICTIONARY, "Creating dictionary.");
DICTIONARY *dict = calloc(1, sizeof(DICTIONARY));
if(!dict) {
fatal("Cannot allocate DICTIONARY");
exit(1);
}
avl_init(&dict->values_index, name_value_compare);
pthread_rwlock_init(&dict->rwlock, NULL);
return dict;
}
void dictionary_destroy(DICTIONARY *dict) {
debug(D_DICTIONARY, "Destroying dictionary.");
pthread_rwlock_wrlock(&dict->rwlock);
while(dict->values) dictionary_name_value_destroy(dict, dict->values);
pthread_rwlock_unlock(&dict->rwlock);
free(dict);
}
// ----------------------------------------------------------------------------
void *dictionary_set(DICTIONARY *dict, const char *name, void *value, size_t value_len) {
debug(D_DICTIONARY, "SET dictionary entry with name '%s'.", name);
pthread_rwlock_rdlock(&dict->rwlock);
NAME_VALUE *nv = dictionary_name_value_index_find(dict, name, 0);
pthread_rwlock_unlock(&dict->rwlock);
if(!nv) {
debug(D_DICTIONARY, "Dictionary entry with name '%s' not found. Creating a new one.", name);
nv = dictionary_name_value_create(dict, name, value, value_len);
if(!nv) {
fatal("Cannot create name_value.");
exit(1);
}
return nv->value;
}
else {
debug(D_DICTIONARY, "Dictionary entry with name '%s' found. Changing its value.", name);
pthread_rwlock_wrlock(&dict->rwlock);
void *old = nv->value;
nv->value = malloc(value_len);
if(!nv->value) fatal("Cannot allocate value of size %z", value_len);
memcpy(nv->value, value, value_len);
pthread_rwlock_unlock(&dict->rwlock);
free(old);
}
return nv->value;
}
void *dictionary_get(DICTIONARY *dict, const char *name) {
debug(D_DICTIONARY, "GET dictionary entry with name '%s'.", name);
pthread_rwlock_rdlock(&dict->rwlock);
NAME_VALUE *nv = dictionary_name_value_index_find(dict, name, 0);
pthread_rwlock_unlock(&dict->rwlock);
if(!nv) {
debug(D_DICTIONARY, "Not found dictionary entry with name '%s'.", name);
return NULL;
}
debug(D_DICTIONARY, "Found dictionary entry with name '%s'.", name);
return nv->value;
}
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