git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/behavior.c

   1 /* LibMemcached
   2  * Copyright (C) 2006-2009 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary: Change the behavior of the memcached connection.
   9  *
  10  */
  11
  12 #include "common.h"
  13 #include <time.h>
  14 #include <sys/types.h>
  15
  16 static bool set_flag(uint64_t data)
  17 {
  18   // Wordy :)
  19   return data ? true : false;
  20 }
  21
  22 /*
  23   This function is used to modify the behavior of running client.
  24
  25   We quit all connections so we can reset the sockets.
  26 */
  27
  28 memcached_return_t memcached_behavior_set(memcached_st *ptr,
  29                                           const memcached_behavior_t flag,
  30                                           uint64_t data)
  31 {
  32   switch (flag)
  33   {
  34   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
  35     ptr->number_of_replicas= (uint32_t)data;
  36     break;
  37   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
  38     ptr->io_msg_watermark= (uint32_t) data;
  39     break;
  40   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
  41     ptr->io_bytes_watermark= (uint32_t)data;
  42     break;
  43   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
  44     ptr->io_key_prefetch = (uint32_t)data;
  45     break;
  46   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
  47     ptr->snd_timeout= (int32_t)data;
  48     break;
  49   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
  50     ptr->rcv_timeout= (int32_t)data;
  51     break;
  52   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
  53     ptr->server_failure_limit= (uint32_t)data;
  54     break;
  55   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
  56     memcached_quit(ptr); // We need t shutdown all of the connections to make sure we do the correct protocol
  57     if (data)
  58     {
  59       ptr->flags.verify_key= false;
  60     }
  61     ptr->flags.binary_protocol= set_flag(data);
  62     break;
  63   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
  64     ptr->flags.support_cas= set_flag(data);
  65     break;
  66   case MEMCACHED_BEHAVIOR_NO_BLOCK:
  67     ptr->flags.no_block= set_flag(data);
  68     memcached_quit(ptr);
  69     break;
  70   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
  71     ptr->flags.buffer_requests= set_flag(data);
  72     memcached_quit(ptr);
  73     break;
  74   case MEMCACHED_BEHAVIOR_USE_UDP:
  75     if (memcached_server_count(ptr))
  76     {
  77       return MEMCACHED_FAILURE;
  78     }
  79     ptr->flags.use_udp= set_flag(data);
  80     if (data)
  81     {
  82       ptr->flags.no_reply= set_flag(data);
  83     }
  84     break;
  85   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
  86     ptr->flags.tcp_nodelay= set_flag(data);
  87     memcached_quit(ptr);
  88     break;
  89   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
  90     ptr->flags.tcp_keepalive= set_flag(data);
  91     memcached_quit(ptr);
  92     break;
  93   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
  94     return memcached_behavior_set_distribution(ptr, (memcached_server_distribution_t)data);
  95   case MEMCACHED_BEHAVIOR_KETAMA:
  96     {
  97       if (data) // Turn on
  98         return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
  99
 100       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_MODULA);
 101     }
 102   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 103     {
 104       (void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_MD5);
 105       (void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_MD5);
 106       ptr->flags.ketama_weighted= set_flag(data);
 107       /**
 108         @note We try to keep the same distribution going. This should be deprecated and rewritten.
 109       */
 110       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
 111     }
 112   case MEMCACHED_BEHAVIOR_HASH:
 113     return memcached_behavior_set_key_hash(ptr, (memcached_hash_t)(data));
 114   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 115     return memcached_behavior_set_distribution_hash(ptr, (memcached_hash_t)(data));
 116   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 117     ptr->flags.use_cache_lookups= set_flag(data);
 118     memcached_quit(ptr);
 119     break;
 120   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 121     if (ptr->flags.binary_protocol)
 122       return memcached_set_error_string(ptr, MEMCACHED_FAILURE,
 123                                         memcached_string_with_size("MEMCACHED_BEHAVIOR_VERIFY_KEY if the binary protocol has been enabled."));
 124     ptr->flags.verify_key= set_flag(data);
 125     break;
 126   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 127     {
 128       ptr->flags.use_sort_hosts= set_flag(data);
 129       run_distribution(ptr);
 130
 131       break;
 132     }
 133   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 134     ptr->poll_timeout= (int32_t)data;
 135     break;
 136   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 137     ptr->connect_timeout= (int32_t)data;
 138     break;
 139   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 140     ptr->retry_timeout= (int32_t)data;
 141     break;
 142   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 143     ptr->send_size= (int32_t)data;
 144     memcached_quit(ptr);
 145     break;
 146   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 147     ptr->recv_size= (int32_t)data;
 148     memcached_quit(ptr);
 149     break;
 150   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 151     ptr->tcp_keepidle= (uint32_t)data;
 152     memcached_quit(ptr);
 153     break;
 154   case MEMCACHED_BEHAVIOR_USER_DATA:
 155     return memcached_set_error_string(ptr, MEMCACHED_FAILURE,
 156                                       memcached_string_with_size("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 157   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 158     ptr->flags.hash_with_prefix_key= set_flag(data);
 159     break;
 160   case MEMCACHED_BEHAVIOR_NOREPLY:
 161     ptr->flags.no_reply= set_flag(data);
 162     break;
 163   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 164     ptr->flags.auto_eject_hosts= set_flag(data);
 165     break;
 166   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 167       srandom((uint32_t) time(NULL));
 168       ptr->flags.randomize_replica_read= set_flag(data);
 169       break;
 170   case MEMCACHED_BEHAVIOR_CORK:
 171       {
 172 #ifdef HAVE_MSG_MORE
 173       break;
 174 #else
 175       return memcached_set_error_string(ptr, MEMCACHED_NOT_SUPPORTED,
 176                                         memcached_string_with_size("MEMCACHED_BEHAVIOR_CORK is not supported on this platform."));
 177 #endif
 178       }
 179       break;
 180   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 181       return memcached_set_error_string(ptr, MEMCACHED_INVALID_ARGUMENTS,
 182                                         memcached_string_with_size("MEMCACHED_BEHAVIOR_LOAD_FROM_FILE can not be set with memcached_behavior_set()"));
 183   case MEMCACHED_BEHAVIOR_MAX:
 184   default:
 185     /* Shouldn't get here */
 186     WATCHPOINT_ASSERT(0);
 187     return memcached_set_error_string(ptr, MEMCACHED_INVALID_ARGUMENTS,
 188                                       memcached_string_with_size("Invalid behavior passed to memcached_behavior_set()"));
 189   }
 190
 191   return MEMCACHED_SUCCESS;
 192 }
 193
 194 bool _is_auto_eject_host(const memcached_st *ptr)
 195 {
 196   return ptr->flags.auto_eject_hosts;
 197 }
 198
 199 uint64_t memcached_behavior_get(memcached_st *ptr,
 200                                 const memcached_behavior_t flag)
 201 {
 202   switch (flag)
 203   {
 204   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
 205     return ptr->number_of_replicas;
 206   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
 207     return ptr->io_msg_watermark;
 208   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
 209     return ptr->io_bytes_watermark;
 210   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
 211     return ptr->io_key_prefetch;
 212   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
 213     return ptr->flags.binary_protocol;
 214   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
 215     return ptr->flags.support_cas;
 216   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 217     return ptr->flags.use_cache_lookups;
 218   case MEMCACHED_BEHAVIOR_NO_BLOCK:
 219     return ptr->flags.no_block;
 220   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
 221     return ptr->flags.buffer_requests;
 222   case MEMCACHED_BEHAVIOR_USE_UDP:
 223     return ptr->flags.use_udp;
 224   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
 225     return ptr->flags.tcp_nodelay;
 226   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 227     return ptr->flags.verify_key;
 228   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 229     return ptr->flags.ketama_weighted;
 230   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
 231     return ptr->distribution;
 232   case MEMCACHED_BEHAVIOR_KETAMA:
 233     return (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA) ? (uint64_t) 1 : 0;
 234   case MEMCACHED_BEHAVIOR_HASH:
 235     return hashkit_get_function(&ptr->hashkit);
 236   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 237     return hashkit_get_function(&ptr->distribution_hashkit);
 238   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
 239     return ptr->server_failure_limit;
 240   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 241     return ptr->flags.use_sort_hosts;
 242   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 243     return (uint64_t)ptr->poll_timeout;
 244   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 245     return (uint64_t)ptr->connect_timeout;
 246   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 247     return (uint64_t)ptr->retry_timeout;
 248   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
 249     return (uint64_t)ptr->snd_timeout;
 250   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
 251     return (uint64_t)ptr->rcv_timeout;
 252   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 253     return (uint64_t)ptr->tcp_keepidle;
 254   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 255     {
 256       int sock_size= 0;
 257       socklen_t sock_length= sizeof(int);
 258       memcached_server_write_instance_st instance;
 259
 260       if (ptr->send_size != -1) // If value is -1 then we are using the default
 261         return (uint64_t) ptr->send_size;
 262
 263       instance= memcached_server_instance_fetch(ptr, 0);
 264
 265       if (instance) // If we have an instance we test, otherwise we just set and pray
 266       {
 267         /* REFACTOR */
 268         /* We just try the first host, and if it is down we return zero */
 269         if ((memcached_connect(instance)) != MEMCACHED_SUCCESS)
 270         {
 271           return 0;
 272         }
 273
 274         if (memcached_io_wait_for_write(instance) != MEMCACHED_SUCCESS)
 275         {
 276           return 0;
 277         }
 278
 279         if (getsockopt(instance->fd, SOL_SOCKET, SO_SNDBUF, &sock_size, &sock_length) < 0)
 280         {
 281           memcached_set_errno(ptr, errno, NULL);
 282           return 0; /* Zero means error */
 283         }
 284       }
 285
 286       return (uint64_t) sock_size;
 287     }
 288   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 289     {
 290       int sock_size= 0;
 291       socklen_t sock_length= sizeof(int);
 292       memcached_server_write_instance_st instance;
 293
 294       if (ptr->recv_size != -1) // If value is -1 then we are using the default
 295         return (uint64_t) ptr->recv_size;
 296
 297       instance= memcached_server_instance_fetch(ptr, 0);
 298
 299       /**
 300         @note REFACTOR
 301       */
 302       if (instance)
 303       {
 304         /* We just try the first host, and if it is down we return zero */
 305         if ((memcached_connect(instance)) != MEMCACHED_SUCCESS)
 306         {
 307           return 0;
 308         }
 309
 310         if (memcached_io_wait_for_write(instance) != MEMCACHED_SUCCESS)
 311         {
 312           return 0;
 313         }
 314
 315         if (getsockopt(instance->fd, SOL_SOCKET, SO_RCVBUF, &sock_size, &sock_length) < 0)
 316         {
 317           memcached_set_errno(ptr, errno, NULL);
 318           return 0; /* Zero means error */
 319         }
 320
 321       }
 322
 323       return (uint64_t) sock_size;
 324     }
 325   case MEMCACHED_BEHAVIOR_USER_DATA:
 326     return memcached_set_error_string(ptr, MEMCACHED_FAILURE,
 327                                       memcached_string_with_size("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 328   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 329     return ptr->flags.hash_with_prefix_key;
 330   case MEMCACHED_BEHAVIOR_NOREPLY:
 331     return ptr->flags.no_reply;
 332   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 333     return ptr->flags.auto_eject_hosts;
 334   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 335     return ptr->flags.randomize_replica_read;
 336   case MEMCACHED_BEHAVIOR_CORK:
 337 #ifdef HAVE_MSG_MORE
 338     return true;
 339 #else
 340     return false;
 341 #endif
 342   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
 343     return ptr->flags.tcp_keepalive;
 344   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 345     return ptr->configure.filename ? true : false;
 346   case MEMCACHED_BEHAVIOR_MAX:
 347   default:
 348     WATCHPOINT_ASSERT(0); /* Programming mistake if it gets this far */
 349     return 0;
 350   }
 351
 352   /* NOTREACHED */
 353 }
 354
 355
 356 memcached_return_t memcached_behavior_set_distribution(memcached_st *ptr, memcached_server_distribution_t type)
 357 {
 358   if (type < MEMCACHED_DISTRIBUTION_CONSISTENT_MAX)
 359   {
 360     ptr->distribution= type;
 361     run_distribution(ptr);
 362     return MEMCACHED_SUCCESS;
 363   }
 364
 365   return memcached_set_error_string(ptr, MEMCACHED_INVALID_ARGUMENTS,
 366                                     memcached_string_with_size("Invalid memcached_server_distribution_t"));
 367 }
 368
 369
 370 memcached_server_distribution_t memcached_behavior_get_distribution(memcached_st *ptr)
 371 {
 372   return ptr->distribution;
 373 }
 374
 375 memcached_return_t memcached_behavior_set_key_hash(memcached_st *ptr, memcached_hash_t type)
 376 {
 377   if (hashkit_set_function(&ptr->hashkit, (hashkit_hash_algorithm_t)type) == HASHKIT_SUCCESS)
 378     return MEMCACHED_SUCCESS;
 379
 380   return memcached_set_error_string(ptr, MEMCACHED_INVALID_ARGUMENTS,
 381                                     memcached_string_with_size("Invalid memcached_hash_t()"));
 382 }
 383
 384 memcached_hash_t memcached_behavior_get_key_hash(memcached_st *ptr)
 385 {
 386   return (memcached_hash_t)hashkit_get_function(&ptr->hashkit);
 387 }
 388
 389 memcached_return_t memcached_behavior_set_distribution_hash(memcached_st *ptr, memcached_hash_t type)
 390 {
 391   if (hashkit_set_function(&ptr->distribution_hashkit, (hashkit_hash_algorithm_t)type) == HASHKIT_SUCCESS)
 392     return MEMCACHED_SUCCESS;
 393
 394   return memcached_set_error_string(ptr, MEMCACHED_INVALID_ARGUMENTS,
 395                                     memcached_string_with_size("Invalid memcached_hash_t()"));
 396 }
 397
 398 memcached_hash_t memcached_behavior_get_distribution_hash(memcached_st *ptr)
 399 {
 400   return (memcached_hash_t)hashkit_get_function(&ptr->distribution_hashkit);
 401 }
 402
 403 const char *libmemcached_string_behavior(const memcached_behavior_t flag)
 404 {
 405   switch (flag)
 406   {
 407   case MEMCACHED_BEHAVIOR_NO_BLOCK: return "MEMCACHED_BEHAVIOR_NO_BLOCK";
 408   case MEMCACHED_BEHAVIOR_TCP_NODELAY: return "MEMCACHED_BEHAVIOR_TCP_NODELAY";
 409   case MEMCACHED_BEHAVIOR_HASH: return "MEMCACHED_BEHAVIOR_HASH";
 410   case MEMCACHED_BEHAVIOR_KETAMA: return "MEMCACHED_BEHAVIOR_KETAMA";
 411   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE";
 412   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE";
 413   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS: return "MEMCACHED_BEHAVIOR_CACHE_LOOKUPS";
 414   case MEMCACHED_BEHAVIOR_SUPPORT_CAS: return "MEMCACHED_BEHAVIOR_SUPPORT_CAS";
 415   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT: return "MEMCACHED_BEHAVIOR_POLL_TIMEOUT";
 416   case MEMCACHED_BEHAVIOR_DISTRIBUTION: return "MEMCACHED_BEHAVIOR_DISTRIBUTION";
 417   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS: return "MEMCACHED_BEHAVIOR_BUFFER_REQUESTS";
 418   case MEMCACHED_BEHAVIOR_USER_DATA: return "MEMCACHED_BEHAVIOR_USER_DATA";
 419   case MEMCACHED_BEHAVIOR_SORT_HOSTS: return "MEMCACHED_BEHAVIOR_SORT_HOSTS";
 420   case MEMCACHED_BEHAVIOR_VERIFY_KEY: return "MEMCACHED_BEHAVIOR_VERIFY_KEY";
 421   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT: return "MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT";
 422   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT: return "MEMCACHED_BEHAVIOR_RETRY_TIMEOUT";
 423   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED: return "MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED";
 424   case MEMCACHED_BEHAVIOR_KETAMA_HASH: return "MEMCACHED_BEHAVIOR_KETAMA_HASH";
 425   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL: return "MEMCACHED_BEHAVIOR_BINARY_PROTOCOL";
 426   case MEMCACHED_BEHAVIOR_SND_TIMEOUT: return "MEMCACHED_BEHAVIOR_SND_TIMEOUT";
 427   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT: return "MEMCACHED_BEHAVIOR_RCV_TIMEOUT";
 428   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT: return "MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT";
 429   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK";
 430   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK";
 431   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH: return "MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH";
 432   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY: return "MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY";
 433   case MEMCACHED_BEHAVIOR_NOREPLY: return "MEMCACHED_BEHAVIOR_NOREPLY";
 434   case MEMCACHED_BEHAVIOR_USE_UDP: return "MEMCACHED_BEHAVIOR_USE_UDP";
 435   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS: return "MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS";
 436   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS: return "MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS";
 437   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ: return "MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ";
 438   case MEMCACHED_BEHAVIOR_CORK: return "MEMCACHED_BEHAVIOR_CORK";
 439   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE: return "MEMCACHED_BEHAVIOR_TCP_KEEPALIVE";
 440   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE: return "MEMCACHED_BEHAVIOR_TCP_KEEPIDLE";
 441   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE: return "MEMCACHED_BEHAVIOR_LOAD_FROM_FILE";
 442   default:
 443   case MEMCACHED_BEHAVIOR_MAX: return "INVALID memcached_behavior_t";
 444   }
 445 }
 446
 447 const char *libmemcached_string_distribution(const memcached_server_distribution_t flag)
 448 {
 449   switch (flag)
 450   {
 451   case MEMCACHED_DISTRIBUTION_MODULA: return "MEMCACHED_DISTRIBUTION_MODULA";
 452   case MEMCACHED_DISTRIBUTION_CONSISTENT: return "MEMCACHED_DISTRIBUTION_CONSISTENT";
 453   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA";
 454   case MEMCACHED_DISTRIBUTION_RANDOM: return "MEMCACHED_DISTRIBUTION_RANDOM";
 455   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY";
 456   default:
 457   case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX: return "INVALID memcached_server_distribution_t";
 458   }
 459 }