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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <drizzled/global.h>
#include <string.h>
#include <mysys/hash.h>
#include <drizzled/xid.h>
XID::XID()
{}
bool XID::eq(XID *xid)
{
return eq(xid->gtrid_length, xid->bqual_length, xid->data);
}
bool XID::eq(long g, long b, const char *d)
{
return g == gtrid_length && b == bqual_length && !memcmp(d, data, g+b);
}
void XID::set(XID *xid)
{
memcpy(this, xid, xid->length());
}
void XID::set(long f, const char *g, long gl, const char *b, long bl)
{
formatID= f;
memcpy(data, g, gtrid_length= gl);
memcpy(data+gl, b, bqual_length= bl);
}
void XID::set(uint64_t xid)
{
my_xid tmp;
formatID= 1;
set(DRIZZLE_XID_PREFIX_LEN, 0, DRIZZLE_XID_PREFIX);
memcpy(data+DRIZZLE_XID_PREFIX_LEN, &server_id, sizeof(server_id));
tmp= xid;
memcpy(data+DRIZZLE_XID_OFFSET, &tmp, sizeof(tmp));
gtrid_length=DRIZZLE_XID_GTRID_LEN;
}
void XID::set(long g, long b, const char *d)
{
formatID= 1;
gtrid_length= g;
bqual_length= b;
memcpy(data, d, g+b);
}
bool XID::is_null()
{
return formatID == -1;
}
void XID::null()
{
formatID= -1;
}
my_xid XID::quick_get_my_xid()
{
my_xid tmp;
memcpy(&tmp, data+DRIZZLE_XID_OFFSET, sizeof(tmp));
return tmp;
}
my_xid XID::get_my_xid()
{
return gtrid_length == DRIZZLE_XID_GTRID_LEN && bqual_length == 0 &&
!memcmp(data+DRIZZLE_XID_PREFIX_LEN, &server_id, sizeof(server_id)) &&
!memcmp(data, DRIZZLE_XID_PREFIX, DRIZZLE_XID_PREFIX_LEN) ?
quick_get_my_xid() : 0;
}
uint32_t XID::length()
{
return sizeof(formatID)+sizeof(gtrid_length)+sizeof(bqual_length)+
gtrid_length+bqual_length;
}
unsigned char *XID::key()
{
return (unsigned char *)>rid_length;
}
uint32_t XID::key_length()
{
return sizeof(gtrid_length)+sizeof(bqual_length)+gtrid_length+bqual_length;
}
/***************************************************************************
Handling of XA id cacheing
***************************************************************************/
pthread_mutex_t LOCK_xid_cache;
HASH xid_cache;
extern "C" unsigned char *xid_get_hash_key(const unsigned char *, size_t *, bool);
extern "C" void xid_free_hash(void *);
unsigned char *xid_get_hash_key(const unsigned char *ptr, size_t *length,
bool )
{
*length=((XID_STATE*)ptr)->xid.key_length();
return ((XID_STATE*)ptr)->xid.key();
}
void xid_free_hash(void *ptr)
{
if (!((XID_STATE*)ptr)->in_session)
free((unsigned char*)ptr);
}
bool xid_cache_init()
{
pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
return hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
xid_get_hash_key, xid_free_hash, 0) != 0;
}
void xid_cache_free()
{
if (hash_inited(&xid_cache))
{
hash_free(&xid_cache);
pthread_mutex_destroy(&LOCK_xid_cache);
}
}
XID_STATE *xid_cache_search(XID *xid)
{
pthread_mutex_lock(&LOCK_xid_cache);
XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
pthread_mutex_unlock(&LOCK_xid_cache);
return res;
}
bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
XID_STATE *xs;
bool res;
pthread_mutex_lock(&LOCK_xid_cache);
if (hash_search(&xid_cache, xid->key(), xid->key_length()))
res=0;
else if (!(xs=(XID_STATE *)malloc(sizeof(*xs))))
res=1;
else
{
xs->xa_state=xa_state;
xs->xid.set(xid);
xs->in_session=0;
res=my_hash_insert(&xid_cache, (unsigned char*)xs);
}
pthread_mutex_unlock(&LOCK_xid_cache);
return res;
}
bool xid_cache_insert(XID_STATE *xid_state)
{
pthread_mutex_lock(&LOCK_xid_cache);
assert(hash_search(&xid_cache, xid_state->xid.key(),
xid_state->xid.key_length())==0);
bool res=my_hash_insert(&xid_cache, (unsigned char*)xid_state);
pthread_mutex_unlock(&LOCK_xid_cache);
return res;
}
void xid_cache_delete(XID_STATE *xid_state)
{
pthread_mutex_lock(&LOCK_xid_cache);
hash_delete(&xid_cache, (unsigned char *)xid_state);
pthread_mutex_unlock(&LOCK_xid_cache);
}
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