git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_behavior.pod

   1 =head1 NAME
   2
   3 memcached_behavior_get memcached_behavior_set
   4
   5 =head1 LIBRARY
   6
   7 C Client Library for memcached (libmemcached, -lmemcached)
   8
   9 =head1 SYNOPSIS
  10
  11   #include <memcached.h>
  12
  13   unsigned long long
  14     memcached_behavior_get (memcached_st *ptr,
  15                             memcached_behavior flag);
  16
  17   memcached_return
  18     memcached_behavior_set (memcached_st *ptr,
  19                             memcached_behavior flag,
  20                             void *data);
  21
  22 =head1 DESCRIPTION
  23
  24 libmemcached(3) behavior can be modified by use memcached_behavior_set().
  25 Default behavior is the library strives to be quick and accurate. Some
  26 behavior, while being faster, can also result in not entirely accurate
  27 behavior (for instance, memcached_set() will always respond with
  28 C<MEMCACHED_SUCCESS>).
  29
  30 memcached_behavior_get() takes a behavior flag and returns whether or not
  31 that behavior is currently enabled in the client.
  32
  33 memcached_behavior_set() changes the value of a particular option of the
  34 client. It takes both a flag (listed below) and a value. For simple on or
  35 off options you just need to pass in a value of 1. Calls to
  36 memcached_behavior_set() will flush and reset all connections.
  37
  38 =over 4
  39
  40 =item MEMCACHED_BEHAVIOR_NO_BLOCK
  41
  42 Causes libmemcached(3) to use asychronous IO. This is the fastest transport
  43 available for storage functions. For read operations it is currently
  44 similar in performance to the non-blocking method (this is being
  45 looked into).
  46
  47 =item MEMCACHED_BEHAVIOR_TCP_NODELAY
  48
  49 Turns on the no-delay feature for connecting sockets (may be faster in some
  50 environments).
  51
  52 =item MEMCACHED_BEHAVIOR_HASH
  53
  54 Makes the default hashing algorithm for keys use MD5. The value can be set to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, MEMCACHED_HASH_FNV1A_32, MEMCACHED_HASH_KETAMA. The behavior for all hashes but MEMCACHED_HASH_DEFAULT is identitical to the Java driver written by Dustin Sallings.
  55
  56 =item MEMCACHED_BEHAVIOR_DISTRIBUTION
  57
  58 Using this you can enable different means of distributing values to servers.
  59 The default method is MEMCACHED_DISTRIBUTION_MODULA. You can enable
  60 consistent hashing by setting MEMCACHED_DISTRIBUTION_CONSISTENT.
  61 Consistent hashing delivers better distribution and allows servers to be
  62 added to the cluster with minimal cache losses.
  63
  64 =item MEMCACHED_BEHAVIOR_CACHE_LOOKUPS
  65
  66 Memcached can cache named lookups so that DNS lookups are made only once.
  67
  68 =item MEMCACHED_BEHAVIOR_SUPPORT_CAS
  69
  70 Support CAS operations (this is not enabled by default at this point in the server since it imposes a slight performance penalty).
  71
  72 =item MEMCACHED_BEHAVIOR_POLL_TIMEOUT
  73
  74 Modify the timeout value that is used by poll(). The default value is -1. An signed int pointer must be passed to memcached_behavior_set() to change this value. For memcached_behavior_get() a signed int value will be cast and returned as the unsigned long long.
  75
  76 =item MEMCACHED_BEHAVIOR_USER_DATA
  77
  78 This allows you to store a pointer to a specifc piece of data. This can be
  79 retrieved from inside of memcached_fetch_execute(). Cloning a memcached_st
  80 will copy the pointer to the clone. This was deprecated in 0.14 in favor
  81 of memcached_callback_set(3). This will be removed in 0.15.
  82
  83 =item MEMCACHED_BEHAVIOR_BUFFER_REQUESTS
  84
  85 Enabling buffered IO causes commands to "buffer" instead of being sent. Any
  86 action that gets data causes this buffer to be be sent to the remote
  87 connection. Quiting the connection or closing down the connection will also
  88 cause the buffered data to be pushed to the remote connection.
  89
  90 =back
  91
  92 =head1 RETURN
  93
  94 memcached_behavior_get() returns either the current value of the get, or 0
  95 or 1 on simple flag behaviors (1 being enabled). memcached_behavior_set()
  96 returns whether or not the behavior was enabled.
  97
  98 =head1 HOME
  99
 100 To find out more information please check:
 101 L<http://tangent.org/552/libmemcached.html>
 102
 103 =head1 AUTHOR
 104
 105 Brian Aker, E<lt>brian@tangent.orgE<gt>
 106
 107 =head1 SEE ALSO
 108
 109 memcached(1) libmemcached(3) memcached_strerror(3)
 110
 111 =cut
 112