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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/memcached|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: eggs]] [[toc:]] == memcached === Description The {{memcached}} library contains procedures that implement the client side of the Memcached protocol. [[http://memcached.org/|Memcached]] is a distributed in-memory key-value store for small chunks of arbitrary data. The Chicken {{memcached}} library uses the {{base64-encode}} procedure from the [[base64]] library to compute hashes for given key objects, and the {{read}} and {{write}} procedures to store Scheme objects in a Memcached instance. === Library procedures <procedure>(connect HOST PORT)</procedure> Connects to the Memcached server instance running on {{HOST}} at {{PORT}}. Returns a server handle object (see below). <procedure>(disconnect H)</procedure> Disconnects the given server handle from its host. <procedure>(stats H)</procedure> Invokes the statistics command on the server indicated by handle {{H}}. Returns an alist of statistics information. <procedure>(set H KEY VAL [HASH])</procedure> Set storage command on the server indicated by handle {{H}}. {{KEY}} and {{VAL}} can be any serializable Scheme object. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. <procedure>(add H KEY VAL [HASH])</procedure> Add storage command on the server indicated by handle {{H}}. {{KEY}} and {{VAL}} can be any serializable Scheme object. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. <procedure>(replace H KEY VAL [HASH])</procedure> Replace storage command on the server indicated by handle {{H}}. {{KEY}} and {{VAL}} can be any serializable Scheme object. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. <procedure>(get H KEY [HASH])</procedure> Get command on the server indicated by handle {{H}}. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns the deserialized object if the key is found, {{#f}} otherwise. <procedure>(get H KEY [HASH])</procedure> Delete command on the server indicated by handle {{H}}. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. <procedure>(incr H KEY DELTA [HASH])</procedure> Increment key command on the server indicated by handle {{H}}. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. <procedure>(decr H KEY DELTA [HASH])</procedure> Decrement key command on the server indicated by handle {{H}}. The hash value for {{KEY}} is obtained by the {{HASH}} procedure, which defaults to the one provided by the Chicken SRFI-69 implementation. Returns {{#t}} on success, {{#f}} otherwise. ==== Server handles All procedures in this library operate on a server handle object, which is created by the {{connect}} procedure. The following predicate and accessors are available for accessing a server handle: <procedure>(server-handle? H)</procedure> Returns {{#t}} is {{H}} is a Memcached server handle, {{#f}} otherwise. <procedure>(server-handle-host H)</procedure> Returns the host name of the given handle. <procedure>(server-handle-port H)</procedure> Returns the port number of the given handle. ==== Convenience macro <macro>(with-server-connection H HOST PORT CMD ...)</macro> A convenience macro for creating and destroying a connection for a given set of commands. {{H}} is the name of the server handle that will be created. The connection is created before any of the forms {{CMD...}} are executed, and is destroyed after the last command is executed. === Example (with-server-connection h "localhost" 11211 (let ((foo 4)) (let ((success (set h "foo" foo))) (let ((foo1 (get h "foo"))) (equal? foo foo1))))) === Version History * 2.0 Using base64 for key hashes; removed dependency on s11n; added procedures gets, cas, append-to, prepend-to [thanks to Seth Alves] * 1.3 Detect if test script is run as root and attempt to start memcached as chicken user in that case * 1.2 Ensure that test script returns non-zero if the unit tests fail (thanks to mario) * 1.1 Importing chicken unit without get (thanks to felix) * 1.0 Initial release === License Based on the [[http://github.com/olegkat/haskell-memcached|Haskell Memcached library]] by Evan Martin <martine@danga.com>. Copyright 2011-2019 Ivan Raikov and Seth Alves. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Description of your changes:

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