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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* LibMemcached
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
* Copyright (C) 2006-2009 Brian Aker
* 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.
*
* * The names of its contributors may not 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
* OWNER 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.
*
*/
#include <libmemcached/common.h>
#define memcached_set_purging(__object, __value) ((__object)->state.is_purging= (__value))
class Purge
{
public:
Purge(Memcached* arg) :
_memc(arg)
{
memcached_set_purging(_memc, true);
}
~Purge()
{
memcached_set_purging(_memc, false);
}
private:
Memcached* _memc;
};
class PollTimeout
{
public:
PollTimeout(Memcached* arg) :
_timeout(arg->poll_timeout),
_origin(arg->poll_timeout)
{
_origin = 2000;
}
~PollTimeout()
{
_origin= _timeout;
}
private:
int32_t _timeout;
int32_t& _origin;
};
bool memcached_purge(org::libmemcached::Instance* ptr)
{
Memcached *root= (Memcached *)ptr->root;
if (memcached_is_purging(ptr->root) || /* already purging */
(memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
(ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
memcached_server_response_count(ptr) < 2))
{
return true;
}
/*
memcached_io_write and memcached_response may call memcached_purge
so we need to be able stop any recursion..
*/
Purge set_purge(root);
WATCHPOINT_ASSERT(ptr->fd != INVALID_SOCKET);
/*
Force a flush of the buffer to ensure that we don't have the n-1 pending
requests buffered up..
*/
if (memcached_io_write(ptr) == false)
{
memcached_set_error(*ptr, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
return false;
}
WATCHPOINT_ASSERT(ptr->fd != INVALID_SOCKET);
bool is_successful= true;
uint32_t no_msg= memcached_server_response_count(ptr) - 1;
if (no_msg > 0)
{
memcached_result_st result;
/*
* We need to increase the timeout, because we might be waiting for
* data to be sent from the server (the commands was in the output buffer
* and just flushed
*/
PollTimeout poll_timeout(ptr->root);
memcached_result_st* result_ptr= memcached_result_create(root, &result);
assert(result_ptr);
for (uint32_t x= 0; x < no_msg; x++)
{
memcached_result_reset(result_ptr);
memcached_return_t rc= memcached_read_one_response(ptr, result_ptr);
/*
* Purge doesn't care for what kind of command results that is received.
* The only kind of errors I care about if is I'm out of sync with the
* protocol or have problems reading data from the network..
*/
if (rc== MEMCACHED_PROTOCOL_ERROR or rc == MEMCACHED_UNKNOWN_READ_FAILURE or rc == MEMCACHED_READ_FAILURE)
{
WATCHPOINT_ERROR(rc);
memcached_io_reset(ptr);
is_successful= false;
}
if (ptr->root->callbacks != NULL)
{
memcached_callback_st cb = *ptr->root->callbacks;
if (memcached_success(rc))
{
for (uint32_t y= 0; y < cb.number_of_callback; y++)
{
if (memcached_fatal((*cb.callback[y])(ptr->root, result_ptr, cb.context)))
{
break;
}
}
}
}
}
memcached_result_free(result_ptr);
}
return is_successful;
}
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