X-Git-Url: https://git.m6w6.name/?a=blobdiff_plain;f=libmemcached%2Fmemcached_hash.c;h=29c8d04850a2d7d3d2b8e69a83153ebd62bce116;hb=99ba76f7596ab5b861e68034ae3007cccf73a5d2;hp=fb8bd63dd8c253a848abd589667d4da5eab2db89;hpb=a9b22f8a1c9f98eef8becdbef11d8e20d43dd23c;p=awesomized%2Flibmemcached

diff --git a/libmemcached/memcached_hash.c b/libmemcached/memcached_hash.c
index fb8bd63d..29c8d048 100644
--- a/libmemcached/memcached_hash.c
+++ b/libmemcached/memcached_hash.c
@@ -84,6 +84,11 @@ uint32_t generate_hash_value(const char *key, size_t key_length, memcached_hash
       hash= murmur_hash(key, key_length);
       break;
     }
+    case MEMCACHED_HASH_JENKINS:
+    {
+      hash=jenkins_hash(key, key_length, 13);
+      break;
+    }
   }
   return hash;
 }
@@ -116,37 +121,25 @@ static uint32_t dispatch_host(memcached_st *ptr, uint32_t hash)
       hash= hash;
       memcached_continuum_item_st *begin, *end, *left, *right, *middle;
       begin= left= ptr->continuum;
-      end= right= ptr->continuum + (num - 1);
+      end= right= ptr->continuum + num;
 
-      while (1)
+      while (left < right)
       {
-        memcached_continuum_item_st *rmiddle;
-
-        middle = left + (right - left) / 2;
-
-        if (middle==end)
-          return begin->index;
-
-        if (middle==begin)
-          return end->index;
-
-        rmiddle = middle+1;
-
-        if (hash<rmiddle->value && hash>=middle->value)
-          return middle->index;
-
+        middle= left + (right - left) / 2;
         if (middle->value < hash)
-          left = middle + 1;
-        else if (middle->value > hash)
-          right = middle - 1;
-
-        if (left>right)
-          return left->index;
+          left= middle + 1;
+        else
+          right= middle;
       }
+      if (right == end)
+        right= begin;
+      return right->index;
     } 
     break;
   case MEMCACHED_DISTRIBUTION_MODULA:
     return hash % ptr->number_of_hosts;
+  case MEMCACHED_DISTRIBUTION_RANDOM:
+    return random() % ptr->number_of_hosts;
   default:
     WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
     return hash % ptr->number_of_hosts;
@@ -169,7 +162,19 @@ uint32_t memcached_generate_hash(memcached_st *ptr, const char *key, size_t key_
   if (ptr->number_of_hosts == 1)
     return 0;
 
-  hash= generate_hash(ptr, key, key_length);
+  if (ptr->flags & MEM_HASH_WITH_PREFIX_KEY)
+  {
+    int temp_len= ptr->prefix_key_length + key_length;
+    char *temp= (char *)malloc(temp_len);
+    strncpy(temp, ptr->prefix_key, ptr->prefix_key_length);
+    strncpy(temp + ptr->prefix_key_length, key, key_length);
+    hash= generate_hash(ptr, temp, temp_len);
+    free(temp);
+  }
+  else
+  {
+    hash= generate_hash(ptr, key, key_length);
+  }
 
   WATCHPOINT_ASSERT(hash);