/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999,2008 Oracle.  All rights reserved.
 *
 * $Id: qam_method.c,v 12.19 2008/01/08 20:58:47 bostic Exp $
 */

#include "db_config.h"

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_am.h"
#include "dbinc/lock.h"
#include "dbinc/mp.h"
#include "dbinc/qam.h"
#include "dbinc/txn.h"

static int __qam_rr __P((DB *, DB_TXN *,
	       const char *, const char *, const char *, qam_name_op));
static int __qam_set_extentsize __P((DB *, u_int32_t));

/*
 * __qam_db_create --
 *	Queue specific initialization of the DB structure.
 *
 * PUBLIC: int __qam_db_create __P((DB *));
 */
int
__qam_db_create(dbp)
	DB *dbp;
{
	QUEUE *t;
	int ret;

	/* Allocate and initialize the private queue structure. */
	if ((ret = __os_calloc(dbp->env, 1, sizeof(QUEUE), &t)) != 0)
		return (ret);
	dbp->q_internal = t;
	dbp->get_q_extentsize = __qam_get_extentsize;
	dbp->set_q_extentsize = __qam_set_extentsize;

	t->re_pad = ' ';

	return (0);
}

/*
 * __qam_db_close --
 *	Queue specific discard of the DB structure.
 *
 * PUBLIC: int __qam_db_close __P((DB *, u_int32_t));
 */
int
__qam_db_close(dbp, flags)
	DB *dbp;
	u_int32_t flags;
{
	DB_MPOOLFILE *mpf;
	MPFARRAY *array;
	QUEUE *t;
	struct __qmpf *mpfp;
	u_int32_t i;
	int ret, t_ret;

	ret = 0;
	if ((t = dbp->q_internal) == NULL)
		return (0);

	array = &t->array1;
again:
	mpfp = array->mpfarray;
	if (mpfp != NULL) {
		for (i = array->low_extent;
		    i <= array->hi_extent; i++, mpfp++) {
			mpf = mpfp->mpf;
			mpfp->mpf = NULL;
			if (mpf != NULL && (t_ret = __memp_fclose(mpf,
			    LF_ISSET(DB_AM_DISCARD) ? DB_MPOOL_DISCARD : 0))
			    != 0 && ret == 0)
				ret = t_ret;
		}
		__os_free(dbp->env, array->mpfarray);
	}
	if (t->array2.n_extent != 0) {
		array = &t->array2;
		array->n_extent = 0;
		goto again;
	}

	if (LF_ISSET(DB_AM_DISCARD) &&
	     (t_ret = __qam_nameop(dbp, NULL,
	     NULL, QAM_NAME_DISCARD)) != 0 && ret == 0)
		ret = t_ret;

	if (t->path != NULL)
		__os_free(dbp->env, t->path);
	__os_free(dbp->env, t);
	dbp->q_internal = NULL;

	return (ret);
}

/*
 * __qam_get_extentsize --
 *	The DB->q_get_extentsize method.
 *
 * PUBLIC: int __qam_get_extentsize __P((DB *, u_int32_t *));
 */
int
__qam_get_extentsize(dbp, q_extentsizep)
	DB *dbp;
	u_int32_t *q_extentsizep;
{
	*q_extentsizep = ((QUEUE*)dbp->q_internal)->page_ext;
	return (0);
}

static int
__qam_set_extentsize(dbp, extentsize)
	DB *dbp;
	u_int32_t extentsize;
{
	DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_extentsize");

	if (extentsize < 1) {
		__db_errx(dbp->env, "Extent size must be at least 1");
		return (EINVAL);
	}

	((QUEUE*)dbp->q_internal)->page_ext = extentsize;

	return (0);
}

/*
 * __queue_pageinfo -
 *	Given a dbp, get first/last page information about a queue.
 *
 * PUBLIC: int __queue_pageinfo __P((DB *, db_pgno_t *, db_pgno_t *,
 * PUBLIC:       int *, int, u_int32_t));
 */
int
__queue_pageinfo(dbp, firstp, lastp, emptyp, prpage, flags)
	DB *dbp;
	db_pgno_t *firstp, *lastp;
	int *emptyp;
	int prpage;
	u_int32_t flags;
{
	DB_MPOOLFILE *mpf;
	DB_THREAD_INFO *ip;
	QMETA *meta;
	db_pgno_t first, i, last;
	int empty, ret, t_ret;

	mpf = dbp->mpf;
	ENV_GET_THREAD_INFO(dbp->env, ip);

	/* Find out the page number of the last page in the database. */
	i = PGNO_BASE_MD;
	if ((ret = __memp_fget(mpf, &i, ip, NULL, 0, &meta)) != 0)
		return (ret);

	first = QAM_RECNO_PAGE(dbp, meta->first_recno);
	last = QAM_RECNO_PAGE(
	    dbp, meta->cur_recno == 1 ? 1 : meta->cur_recno - 1);

	empty = meta->cur_recno == meta->first_recno;
	if (firstp != NULL)
		*firstp = first;
	if (lastp != NULL)
		*lastp = last;
	if (emptyp != NULL)
		*emptyp = empty;
#ifdef HAVE_STATISTICS
	if (prpage)
		ret = __db_prpage(dbp, (PAGE *)meta, flags);
#else
	COMPQUIET(prpage, 0);
	COMPQUIET(flags, 0);
#endif

	if ((t_ret = __memp_fput(mpf,
	    ip, meta, dbp->priority)) != 0 && ret == 0)
		ret = t_ret;

	return (ret);
}

#ifdef HAVE_STATISTICS
/*
 * __db_prqueue --
 *	Print out a queue
 *
 * PUBLIC: int __db_prqueue __P((DB *, u_int32_t));
 */
int
__db_prqueue(dbp, flags)
	DB *dbp;
	u_int32_t flags;
{
	DBC *dbc;
	DB_THREAD_INFO *ip;
	PAGE *h;
	db_pgno_t first, i, last, pg_ext, stop;
	int empty, ret, t_ret;

	if ((ret = __queue_pageinfo(dbp, &first, &last, &empty, 1, flags)) != 0)
		return (ret);

	if (empty || ret != 0)
		return (ret);

	ENV_GET_THREAD_INFO(dbp->env, ip);
	if ((ret = __db_cursor(dbp, ip, NULL, &dbc, 0)) != 0)
		return (ret);
	i = first;
	if (first > last)
		stop = QAM_RECNO_PAGE(dbp, UINT32_MAX);
	else
		stop = last;

	/* Dump each page. */
	pg_ext = ((QUEUE *)dbp->q_internal)->page_ext;
begin:
	for (; i <= stop; ++i) {
		if ((ret = __qam_fget(dbc, &i, 0, &h)) != 0) {
			if (pg_ext == 0) {
				if (ret == DB_PAGE_NOTFOUND && first == last)
					ret = 0;
				goto err;
			}
			if (ret == ENOENT || ret == DB_PAGE_NOTFOUND) {
				i += (pg_ext - ((i - 1) % pg_ext)) - 1;
				ret = 0;
				continue;
			}
			goto err;
		}
		(void)__db_prpage(dbp, h, flags);
		if ((ret = __qam_fput(dbc, i, h, dbp->priority)) != 0)
			goto err;
	}

	if (first > last) {
		i = 1;
		stop = last;
		first = last;
		goto begin;
	}

err:
	if ((t_ret = __dbc_close(dbc)) != 0 && ret == 0)
		ret = t_ret;
	return (ret);
}
#endif

/*
 * __qam_remove --
 *	Remove method for a Queue.
 *
 * PUBLIC: int __qam_remove __P((DB *, DB_TXN *, const char *, const char *));
 */
int
__qam_remove(dbp, txn, name, subdb)
	DB *dbp;
	DB_TXN *txn;
	const char *name, *subdb;
{
	return (__qam_rr(dbp, txn, name, subdb, NULL, QAM_NAME_REMOVE));
}

/*
 * __qam_rename --
 *	Rename method for a Queue.
 *
 * PUBLIC: int __qam_rename __P((DB *,
 * PUBLIC:         DB_TXN *, const char *, const char *, const char *));
 */
int
__qam_rename(dbp, txn, name, subdb, newname)
	DB *dbp;
	DB_TXN *txn;
	const char *name, *subdb, *newname;
{
	return (__qam_rr(dbp, txn, name, subdb, newname, QAM_NAME_RENAME));
}

/*
 * __qam_rr --
 *	Remove/Rename method for a Queue.
 */
static int
__qam_rr(dbp, txn, name, subdb, newname, op)
	DB *dbp;
	DB_TXN *txn;
	const char *name, *subdb, *newname;
	qam_name_op op;
{
	DB *tmpdbp;
	DB_THREAD_INFO *ip;
	ENV *env;
	QUEUE *qp;
	int ret, t_ret;

	env = dbp->env;
	ret = 0;

	if (subdb != NULL && name != NULL) {
		__db_errx(env,
		    "Queue does not support multiple databases per file");
		return (EINVAL);
	}
	ENV_GET_THREAD_INFO(env, ip);

	/*
	 * Since regular rename no longer opens the database, we may have
	 * to do it here.
	 */
	if (F_ISSET(dbp, DB_AM_OPEN_CALLED))
		tmpdbp = dbp;
	else {
		if ((ret = __db_create_internal(&tmpdbp, env, 0)) != 0)
			return (ret);

		/*
		 * We need to make sure we don't self-deadlock, so give
		 * this dbp the same locker as the incoming one.
		 */
		tmpdbp->locker = dbp->locker;
		if ((ret = __db_open(tmpdbp, ip, txn,
		    name, NULL, DB_QUEUE, DB_RDONLY, 0, PGNO_BASE_MD)) != 0)
			goto err;
	}

	qp = (QUEUE *)tmpdbp->q_internal;
	if (qp->page_ext != 0)
		ret = __qam_nameop(tmpdbp, txn, newname, op);

	if (!F_ISSET(dbp, DB_AM_OPEN_CALLED)) {
err:		/*
		 * Since we copied the locker ID from the dbp, we'd better not
		 * free it here.
		 */
		tmpdbp->locker = NULL;

		/* We need to remove the lock event we associated with this. */
		if (txn != NULL)
			__txn_remlock(env,
			    txn, &tmpdbp->handle_lock, DB_LOCK_INVALIDID);

		if (txn == NULL ) {
			if ((t_ret = __db_close(tmpdbp,
			    txn, DB_NOSYNC)) != 0 && ret == 0)
				ret = t_ret;
		} else {
			if ((t_ret = __txn_closeevent(env,
			    txn, tmpdbp)) != 0 && ret == 0)
				ret = t_ret;
		}
	}
	return (ret);
}

/*
 * __qam_map_flags --
 *	Map queue-specific flags from public to the internal values.
 *
 * PUBLIC: void __qam_map_flags __P((DB *, u_int32_t *, u_int32_t *));
 */
void
__qam_map_flags(dbp, inflagsp, outflagsp)
	DB *dbp;
	u_int32_t *inflagsp, *outflagsp;
{
	COMPQUIET(dbp, NULL);

	if (FLD_ISSET(*inflagsp, DB_INORDER)) {
		FLD_SET(*outflagsp, DB_AM_INORDER);
		FLD_CLR(*inflagsp, DB_INORDER);
	}
}

/*
 * __qam_set_flags --
 *	Set queue-specific flags.
 *
 * PUBLIC: int __qam_set_flags __P((DB *, u_int32_t *flagsp));
 */
int
__qam_set_flags(dbp, flagsp)
	DB *dbp;
	u_int32_t *flagsp;
{

	__qam_map_flags(dbp, flagsp, &dbp->flags);
	return (0);
}