1 files changed, 117 insertions, 0 deletions
diff --git a/common/dhash/dhash_example.c b/common/dhash/dhash_example.c
new file mode 100644
index 000000000..af46ca889
--- /dev/null
+++ b/common/dhash/dhash_example.c
@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "dhash.h"
+
+struct my_data_t {
+    int foo;
+    char bar[128];
+};
+
+void delete_callback(hash_entry_t *entry)
+{
+    if (entry->value.type == HASH_VALUE_PTR) free(entry->value.ptr);
+}
+
+bool visit_callback(hash_entry_t *entry, void *user_data)
+{
+    unsigned long *count = (unsigned long *)user_data;
+    struct my_data_t *my_data = (struct my_data_t *) entry->value.ptr;
+
+    (*count)++;
+
+    printf("%s = [foo=%d bar=%s]\n", entry->key.str, my_data->foo, my_data->bar);
+    return true;
+}
+
+struct my_data_t *new_data(int foo, char *bar)
+{
+    struct my_data_t *my_data = malloc(sizeof(struct my_data_t));
+    my_data->foo = foo;
+    strncpy(my_data->bar, bar, sizeof(my_data->bar));
+    return my_data;
+}
+int main(int argc, char **argv)
+{
+    static hash_table_t *table = NULL;
+    hash_key_t key, *keys;
+    hash_value_t value;
+    struct hash_iter_context_t *iter;
+    hash_entry_t *entry;
+    unsigned long i, n_entries;
+    int error;
+    struct my_data_t *my_data = new_data(1024, "Hello World!");
+    unsigned long count;
+
+    /* Create a hash table */
+    if ((error = hash_create(10, &table, delete_callback)) != HASH_SUCCESS) {
+        fprintf(stderr, "cannot create hash table (%s)\n", hash_error_string(error));
+        return error;
+    }
+
+    /* Enter a key named "My Data" and specify it's value as a pointer to my_data */
+    key.type = HASH_KEY_STRING;
+    key.str = "My Data";
+    value.type = HASH_VALUE_PTR;
+    value.ptr = my_data;
+
+    if ((error = hash_enter(table, &key, &value)) != HASH_SUCCESS) {
+        fprintf(stderr, "cannot add to table \"%s\" (%s)\n", key.str, hash_error_string(error));
+        return error;
+    }
+
+    /* Get a list of keys and print them out, free the list when we're done */
+    if ((error = hash_keys(table, &count, &keys)) != HASH_SUCCESS) {
+        fprintf(stderr, "cannot get key list (%s)\n", hash_error_string(error));
+        return error;
+    }
+
+    for (i = 0; i < count; i++)
+        printf("key: %s\n", keys[i].str);
+    free(keys);
+
+    /* Lookup the key named "My Data" */
+    key.type = HASH_KEY_STRING;
+    key.str = "My Data";
+    if ((error = hash_lookup(table, &key, &value)) != HASH_SUCCESS) {
+        fprintf(stderr, "cannot find key \"%s\" (%s)\n", key.str, hash_error_string(error));
+    }
+
+    /* Visit each entry in the table, callback will increment count on each visit */
+    printf("Iterate using callback\n");
+    count = 0;
+    hash_iterate(table, visit_callback, &count);
+
+    /* Assure number of visits equal the table size */
+    assert(count == hash_count(table));
+
+    /* Visit each entry using iterator object */
+    printf("Iterate using iterator\n");
+    n_entries = 0;
+    iter = new_hash_iter_context(table);
+    while ((entry = iter->next(iter)) != NULL) {
+        struct my_data_t *my_data = (struct my_data_t *) entry->value.ptr;
+
+        printf("%s = [foo=%d bar=%s]\n", entry->key.str, my_data->foo, my_data->bar);
+        n_entries++;
+    }
+    free(iter);
+    /* Assure number of visits equal the table size */
+    assert(n_entries == hash_count(table));
+
+    /* Remove the entry, deletion callback will be invoked */
+    key.type = HASH_KEY_STRING;
+    key.str = "My Data";
+    if ((error = hash_delete(table, &key)) != HASH_SUCCESS) {
+        fprintf(stderr, "cannot delete from table (%s)\n", hash_error_string(error));
+    }
+
+    /* Assure key is no longer in table */
+    assert (!hash_has_key(table, &key));
+
+    /* Free the table */
+    hash_destroy(table);
+
+    return 0;
+}