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-rw-r--r--libibex/ChangeLog69
-rw-r--r--libibex/Makefile.am2
-rw-r--r--libibex/block.c210
-rw-r--r--libibex/block.h7
-rw-r--r--libibex/disktail.c27
-rw-r--r--libibex/dumpindex.c27
-rw-r--r--libibex/hash.c95
-rw-r--r--libibex/ibex_block.c13
-rw-r--r--libibex/ibex_internal.h3
-rw-r--r--libibex/index.h15
-rw-r--r--libibex/wordindex.c11
-rw-r--r--libibex/wordindex.h7
-rw-r--r--libibex/wordindexmem.c721
13 files changed, 1121 insertions, 86 deletions
diff --git a/libibex/ChangeLog b/libibex/ChangeLog
index 53187c03c6..5318e935c4 100644
--- a/libibex/ChangeLog
+++ b/libibex/ChangeLog
@@ -1,14 +1,83 @@
+2000-10-25 Not Zed <NotZed@HelixCode.com>
+
+ * ibex_internal.h (IBEX_VERSION): Bumped to another version. The
+ file format hasn't changed, but earlier bugs may create invalid
+ files.
+
+ * block.c (ibex_block_read): Use the root data directly.
+ (ibex_block_cache_open): As well.
+ (ibex_block_get): And here too.
+ (ibex_block_cache_sync): Sync the root block directly here.
+
+ * block.h: Pad root block out to 1024 bytes.
+ Added root block to struct _memcache.
+
+ * disktail.c (tail_get): Dirty the root block.
+ (tail_get): Fix for changes to root access.
+ (disk_remove): And here too.
+
+ * wordindexmem.c (sync_cache_entry): Handle the case of not having
+ any files in the list, which can happen now.
+ (word_index_pre): Make sure we set the wordid on the new cache
+ entry.
+
+ * ibex_block.c (ibex_save): Sigh. Pass the right argument to
+ index_post.
+
2000-10-24 JP Rosevear <jpr@helixcode.com>
* .cvsignore: Shush
2000-10-24 Not Zed <NotZed@HelixCode.com>
+ * block.c (ibex_block_cache_open): Create a word_index_mem for
+ indexing the words, rather than a word_index.
+
+ * ibex_block.c (ibex_index_buffer): If we haven't called index_pre
+ yet, do it before indexing anything.
+ (ibex_save): If wehave called index_pre previously, call
+ index_post.
+ (ibex_close): And same for here.
+
+ * index.h: Added a cursor class, and cursor retrieval function for
+ iterating through an index's keys.
+
+ * wordindexmem.c (ibex_create_word_index_mem): New word class,
+ similar to wordindex, but meant to be faster for updates.
+ (word_index_pre): Implement. We load all keys into memory.
+ (word_index_post): Implement. We sync and free all keys.
+ (find): Remove lru code, its no longer a cache, but a lookup
+ table.
+ (add_index_cache): Remove lru code here too.
+ (find_name): And here.
+ (word_flush): Flush the hashtable direct.
+ (word_close): Call flush to flush, rather than doing it ourselves.
+ (add_index_cache): If we are in an index state, we can assume a
+ cache miss == a new word.
+ (word_index_post): Maintain whether or not we are in an index
+ state, and the depth of the state.
+ (word_index_pre): Likewise. Dont reread the index if we have
+ already.
+ (cache_sanity): Fixed for struct changes.
+
+ * wordindex.h (IBEXWordClass): Added functions to prepare/cleanup
+ for lots of indexing. i.e. can be used to optimise indexing speed
+ at the cost of extra memory usage during the indexing process.
+
* dumpindex.c: Dumps the contents of indexs.
* hash.c (ibex_hash_dump_rec): Also print the word count.
+ (hash_cursor_create): Create a new cursor for iterating through a
+ hashtable.
+ (hash_cursor_close): 'close' the cursor. It is upto the
+ application to close any cursors it creates.
+ (hash_cursor_next): Goto the next key id.
+ (hash_cursor_next_key): Goto the next key, reutrn the key.
+ (hash_get_cursor): Return a cursor object.
* wordindex.c (unindex_name): Cross-check the cache as well.
+ (word_index_post):
+ (word_index_pre): Added (empty) callbacks for pre/post functions.
2000-10-12 Not Zed <NotZed@HelixCode.com>
diff --git a/libibex/Makefile.am b/libibex/Makefile.am
index fdde10aca3..6cc88186d6 100644
--- a/libibex/Makefile.am
+++ b/libibex/Makefile.am
@@ -3,7 +3,7 @@
noinst_LTLIBRARIES = libibex.la
libibex_la_SOURCES = \
- wordindex.c \
+ wordindex.c wordindexmem.c \
block.c ibex.h \
hash.c \
disktail.c \
diff --git a/libibex/block.c b/libibex/block.c
index 8e10a116cb..52a79d27ae 100644
--- a/libibex/block.c
+++ b/libibex/block.c
@@ -30,11 +30,18 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
-
+#include <errno.h>
+#include <string.h>
#include <glib.h>
#include "block.h"
+/*#define MALLOC_CHECK*/
+
+#ifdef MALLOC_CHECK
+#include <mcheck.h>
+#endif
+
#define d(x)
/*#define DEBUG*/
@@ -113,6 +120,27 @@ add_miss(struct _memcache *index, int id)
}
#endif /* IBEX_STATS */
+#ifdef MALLOC_CHECK
+static void
+checkmem(void *p)
+{
+ if (p) {
+ int status = mprobe(p);
+
+ switch (status) {
+ case MCHECK_HEAD:
+ printf("Memory underrun at %p\n", p);
+ abort();
+ case MCHECK_TAIL:
+ printf("Memory overrun at %p\n", p);
+ abort();
+ case MCHECK_FREE:
+ printf("Double free %p\n", p);
+ abort();
+ }
+ }
+}
+#endif
/* simple list routines (for simplified memory management of cache/lists) */
@@ -187,6 +215,29 @@ memblock_addr(struct _block *block)
return (struct _memblock *)(((char *)block) - G_STRUCT_OFFSET(struct _memblock, data));
}
+/* read/sync the rootblock into the block_cache structure */
+static int
+ibex_block_read_root(struct _memcache *block_cache)
+{
+ lseek(block_cache->fd, 0, SEEK_SET);
+ if (read(block_cache->fd, &block_cache->root, sizeof(block_cache->root)) != sizeof(block_cache->root)) {
+
+ return -1;
+ }
+ return 0;
+}
+
+static int
+ibex_block_sync_root(struct _memcache *block_cache)
+{
+ lseek(block_cache->fd, 0, SEEK_SET);
+ if (write(block_cache->fd, &block_cache->root, sizeof(block_cache->root)) != sizeof(block_cache->root)) {
+ return -1;
+ }
+ return fsync(block_cache->fd);
+}
+
+
/**
* ibex_block_dirty:
* @block:
@@ -224,27 +275,22 @@ sync_block(struct _memcache *block_cache, struct _memblock *memblock)
void
ibex_block_cache_sync(struct _memcache *block_cache)
{
- struct _memblock *memblock, *rootblock = 0;
+ struct _memblock *memblock;
memblock = (struct _memblock *)block_cache->nodes.head;
while (memblock->next) {
- if (memblock->block == 0) {
- rootblock = memblock;
- } else {
- if (memblock->flags & BLOCK_DIRTY) {
- sync_block(block_cache, memblock);
- }
+#ifdef MALLOC_CHECK
+ checkmem(memblock);
+#endif
+ if (memblock->flags & BLOCK_DIRTY) {
+ sync_block(block_cache, memblock);
}
memblock = memblock->next;
}
- if (rootblock) {
- struct _root *root = (struct _root *)&rootblock->data;
- root->flags |= IBEX_ROOT_SYNCF;
- sync_block(block_cache, rootblock);
- }
- if (fsync(block_cache->fd) == 0) {
- block_cache->flags |= IBEX_ROOT_SYNCF;
+ block_cache->root.flags |= IBEX_ROOT_SYNCF;
+ if (ibex_block_sync_root(block_cache) != 0) {
+ block_cache->root.flags &= ~IBEX_ROOT_SYNCF;
}
#ifdef IBEX_STATS
@@ -253,6 +299,25 @@ ibex_block_cache_sync(struct _memcache *block_cache)
}
+#ifdef MALLOC_CHECK
+static void
+check_cache(struct _memcache *block_cache)
+{
+ struct _memblock *mw, *mn;
+
+ checkmem(block_cache);
+ checkmem(block_cache->index);
+
+ mw = (struct _memblock *)block_cache->nodes.head;
+ mn = mw->next;
+ while (mn) {
+ checkmem(mw);
+ mw = mn;
+ mn = mn->next;
+ }
+}
+#endif
+
/**
* ibex_block_cache_flush:
* @block_cache:
@@ -278,7 +343,6 @@ ibex_block_cache_flush(struct _memcache *block_cache)
ibex_list_new(&block_cache->nodes);
}
-
/**
* ibex_block_read:
* @block_cache:
@@ -296,32 +360,39 @@ ibex_block_read(struct _memcache *block_cache, blockid_t blockid)
{
struct _memblock *memblock;
- {
- /* assert blockid<roof */
- if (blockid > 0) {
- struct _root *root = (struct _root *)ibex_block_read(block_cache, 0);
- g_assert(blockid < root->roof);
- }
- }
+#ifdef MALLOC_CHECK
+ check_cache(block_cache);
+#endif
+
+ /* nothing can read the root block directly */
+ g_assert(blockid != 0);
+ g_assert(blockid < block_cache->root.roof);
memblock = g_hash_table_lookup(block_cache->index, (void *)blockid);
+
+#ifdef MALLOC_CHECK
+ check_cache(block_cache);
+#endif
+
if (memblock) {
d(printf("foudn blockid in cache %d = %p\n", blockid, &memblock->data));
-#if 0
- if (blockid == 0) {
- struct _root *root = &memblock->data;
- d(printf("superblock state:\n"
- " roof = %d\n free = %d\n words = %d\n names = %d\n tail = %d",
- root->roof, root->free, root->words, root->names, root->tail));
-
- }
-#endif
+
/* 'access' page */
ibex_list_remove((struct _listnode *)memblock);
ibex_list_addtail(&block_cache->nodes, (struct _listnode *)memblock);
+
+#ifdef MALLOC_CHECK
+ check_cache(block_cache);
+#endif
+
#ifdef IBEX_STATS
add_hit(block_cache, memblock->block);
#endif
+
+#ifdef MALLOC_CHECK
+ check_cache(block_cache);
+#endif
+
return &memblock->data;
}
#ifdef IBEX_STATS
@@ -338,6 +409,7 @@ ibex_block_read(struct _memcache *block_cache, blockid_t blockid)
lseek(block_cache->fd, blockid, SEEK_SET);
memset(&memblock->data, 0, sizeof(memblock->data));
read(block_cache->fd, &memblock->data, sizeof(memblock->data));
+
ibex_list_addtail(&block_cache->nodes, (struct _listnode *)memblock);
g_hash_table_insert(block_cache->index, (void *)blockid, memblock);
if (block_cache->count >= CACHE_SIZE) {
@@ -347,18 +419,14 @@ ibex_block_read(struct _memcache *block_cache, blockid_t blockid)
ibex_list_remove((struct _listnode *)old);
if (old->flags & BLOCK_DIRTY) {
/* are we about to un-sync the file? update root and sync it */
- if (block_cache->flags & IBEX_ROOT_SYNCF) {
- /* TODO: put the rootblock in the block_cache struct, not in the cache */
- struct _memblock *rootblock = g_hash_table_lookup(block_cache->index, (void *)0);
- struct _root *root = (struct _root *)&rootblock->data;
-
+ if (block_cache->root.flags & IBEX_ROOT_SYNCF) {
printf("Unsyncing root block\n");
- g_assert(rootblock != NULL);
- root->flags &= ~IBEX_ROOT_SYNCF;
- sync_block(block_cache, rootblock);
- if (fsync(block_cache->fd) == 0)
- block_cache->flags &= ~IBEX_ROOT_SYNCF;
+ block_cache->root.flags &= ~IBEX_ROOT_SYNCF;
+ if (ibex_block_sync_root(block_cache) != 0) {
+ /* what do we do? i dont know! */
+ g_warning("Could not sync root block of index: %s", strerror(errno));
+ }
}
sync_block(block_cache, old);
}
@@ -369,6 +437,9 @@ ibex_block_read(struct _memcache *block_cache, blockid_t blockid)
d(printf(" --- cached blocks : %d\n", block_cache->count));
+#ifdef MALLOC_CHECK
+ check_cache(block_cache);
+#endif
return &memblock->data;
}
@@ -389,7 +460,6 @@ ibex_block_read(struct _memcache *block_cache, blockid_t blockid)
struct _memcache *
ibex_block_cache_open(const char *name, int flags, int mode)
{
- struct _root *root;
struct _memcache *block_cache = g_malloc0(sizeof(*block_cache));
d(printf("opening ibex file: %s", name));
@@ -406,33 +476,33 @@ ibex_block_cache_open(const char *name, int flags, int mode)
return NULL;
}
- root = (struct _root *)ibex_block_read(block_cache, 0);
- if (root->roof == 0
- || memcmp(root->version, "ibx4", 4)
- || ((root->flags & IBEX_ROOT_SYNCF) == 0)) {
+ ibex_block_read_root(block_cache);
+ if (block_cache->root.roof == 0
+ || memcmp(block_cache->root.version, "ibx5", 4)
+ || ((block_cache->root.flags & IBEX_ROOT_SYNCF) == 0)) {
(printf("Initialising superblock\n"));
/* reset root data */
- memcpy(root->version, "ibx4", 4);
- root->roof = 1024;
- root->free = 0;
- root->words = 0;
- root->names = 0;
- root->tail = 0; /* list of tail blocks */
- root->flags = 0;
- ibex_block_dirty((struct _block *)root);
+ memcpy(block_cache->root.version, "ibx5", 4);
+ block_cache->root.roof = 1024;
+ block_cache->root.free = 0;
+ block_cache->root.words = 0;
+ block_cache->root.names = 0;
+ block_cache->root.tail = 0; /* list of tail blocks */
+ block_cache->root.flags = 0;
+ ibex_block_sync_root(block_cache);
/* reset the file contents */
ftruncate(block_cache->fd, 1024);
} else {
(printf("superblock already initialised:\n"
- " roof = %d\n free = %d\n words = %d\n names = %d\n tail = %d",
- root->roof, root->free, root->words, root->names, root->tail));
+ " roof = %d\n free = %d\n words = %d\n names = %d\n tail = %d\n",
+ block_cache->root.roof, block_cache->root.free,
+ block_cache->root.words, block_cache->root.names, block_cache->root.tail));
}
- block_cache->flags = root->flags;
- /* this should be moved higher up */
+ /* FIXME: this should be moved higher up in the object tree */
{
- struct _IBEXWord *ibex_create_word_index(struct _memcache *bc, blockid_t *wordroot, blockid_t *nameroot);
+ struct _IBEXWord *ibex_create_word_index_mem(struct _memcache *bc, blockid_t *wordroot, blockid_t *nameroot);
- block_cache->words = ibex_create_word_index(block_cache, &root->words, &root->names);
+ block_cache->words = ibex_create_word_index_mem(block_cache, &block_cache->root.words,&block_cache->root.names);
}
#ifdef IBEX_STATS
@@ -480,12 +550,10 @@ ibex_block_cache_close(struct _memcache *block_cache)
void
ibex_block_free(struct _memcache *block_cache, blockid_t blockid)
{
- struct _root *root = (struct _root *)ibex_block_read(block_cache, 0);
struct _block *block = ibex_block_read(block_cache, blockid);
- block->next = block_number(root->free);
- root->free = blockid;
- ibex_block_dirty((struct _block *)root);
+ block->next = block_number(block_cache->root.free);
+ block_cache->root.free = blockid;
ibex_block_dirty((struct _block *)block);
}
@@ -502,19 +570,18 @@ ibex_block_free(struct _memcache *block_cache, blockid_t blockid)
blockid_t
ibex_block_get(struct _memcache *block_cache)
{
- struct _root *root = (struct _root *)ibex_block_read(block_cache, 0);
struct _block *block;
blockid_t head;
- if (root->free) {
- head = root->free;
+ if (block_cache->root.free) {
+ head = block_cache->root.free;
block = ibex_block_read(block_cache, head);
- root->free = block_location(block->next);
+ block_cache->root.free = block_location(block->next);
} else {
/* TODO: check the block will fit first */
/* TODO: no need to read this block, can allocate it manually (saves a syscall/read) */
- head = root->roof;
- root->roof += BLOCK_SIZE;
+ head = block_cache->root.roof;
+ block_cache->root.roof += BLOCK_SIZE;
block = ibex_block_read(block_cache, head);
}
@@ -524,6 +591,5 @@ ibex_block_get(struct _memcache *block_cache)
block->next = 0;
block->used = 0;
ibex_block_dirty(block);
- ibex_block_dirty((struct _block *)root);
return head;
}
diff --git a/libibex/block.h b/libibex/block.h
index deb6494231..6de33281b4 100644
--- a/libibex/block.h
+++ b/libibex/block.h
@@ -27,6 +27,9 @@ struct _root {
blockid_t names; /* root of names index */
char flags; /* state flags */
+
+ /* makes structure fill up to 1024 bytes */
+ char dummy[1024 - (sizeof(char)*5) - (sizeof(blockid_t)*5)];
};
#define IBEX_ROOT_SYNCF (1<<0) /* file is synced */
@@ -74,11 +77,11 @@ struct _memcache {
GHashTable *index; /* blockid->memblock mapping */
int fd; /* file fd */
- int flags; /* flags (mirror of root->flags) */
-
#ifdef IBEX_STATS
GHashTable *stats;
#endif
+ struct _root root; /* root block */
+
/* temporary here */
struct _IBEXWord *words; /* word index */
};
diff --git a/libibex/disktail.c b/libibex/disktail.c
index 90562889de..9f5a0dbea2 100644
--- a/libibex/disktail.c
+++ b/libibex/disktail.c
@@ -214,7 +214,6 @@ tail_dump(struct _memcache *blocks, blockid_t tailid)
static blockid_t
tail_get(struct _memcache *blocks, int size)
{
- struct _root *root = (struct _root *)ibex_block_read(blocks, 0);
blockid_t tailid;
struct _tailblock *tail;
int freeindex;
@@ -225,22 +224,30 @@ tail_get(struct _memcache *blocks, int size)
/* look for a node with enough space, if we dont find it fairly
quickly, just quit. needs a better free algorithm i think ... */
- tailid = root->tail;
+ tailid = blocks->root.tail;
while (tailid && count<5) {
int space;
d(printf(" checking tail node %d\n", tailid));
tail = (struct _tailblock *)ibex_block_read(blocks, tailid);
+
if (tail->used == 0) {
/* assume its big enough ... */
tail->used = 1;
tail->tb_offset[0] = sizeof(tail->tb_data)/sizeof(tail->tb_data[0]) - size;
d(printf("allocated %d (%d), used %d\n", tailid, tailid, tail->used));
ibex_block_dirty((struct _block *)tail);
+
+ g_assert(&tail->tb_offset[tail->used-1]
+ < &tail->tb_data[tail->tb_offset[tail->used-1]]);
+
return tailid;
}
+ g_assert(&tail->tb_offset[tail->used-1]
+ < &tail->tb_data[tail->tb_offset[tail->used-1]]);
+
/* see if we have a free slot first */
freeindex = -1;
end = &tail->tb_data[sizeof(tail->tb_data)/sizeof(tail->tb_data[0])];
@@ -280,16 +287,18 @@ tail_get(struct _memcache *blocks, int size)
}
d(printf("allocating new data node for tail data\n"));
- /* didn't find one, setup a new one */
- root = (struct _root *)ibex_block_read(blocks, 0);
tailid = ibex_block_get(blocks);
tail = (struct _tailblock *)ibex_block_read(blocks, tailid);
- tail->next = block_number(root->tail);
- root->tail = tailid;
+ tail->next = block_number(blocks->root.tail);
+ blocks->root.tail = tailid;
tail->used = 1;
tail->tb_offset[0] = sizeof(tail->tb_data)/sizeof(tail->tb_data[0]) - size;
ibex_block_dirty((struct _block *)tail);
d(printf("allocated %d (%d), used %d\n", tailid, TAIL_KEY(tailid, 0), tail->used));
+
+ g_assert(&tail->tb_offset[tail->used-1]
+ < &tail->tb_data[tail->tb_offset[tail->used-1]]);
+
return TAIL_KEY(tailid, 0);
}
@@ -578,15 +587,13 @@ disk_remove(struct _IBEXStore *store, blockid_t *headptr, blockid_t *tailptr, na
start->used--;
block->bl_data[i] = start->bl_data[start->used];
if (start->used == 0) {
- struct _root *root = (struct _root *)ibex_block_read(store->blocks, 0);
blockid_t new;
d(printf("dropping block %d, new head = %d\n", head, start->next));
new = block_location(start->next);
- start->next = block_number(root->free);
- root->free = head;
+ start->next = block_number(store->blocks->root.free);
+ store->blocks->root.free = head;
head = new;
- ibex_block_dirty((struct _block *)root);
}
ibex_block_dirty(block);
ibex_block_dirty(start);
diff --git a/libibex/dumpindex.c b/libibex/dumpindex.c
index 92f4b08845..cf4f02cc8a 100644
--- a/libibex/dumpindex.c
+++ b/libibex/dumpindex.c
@@ -9,6 +9,30 @@
extern void ibex_hash_dump(struct _IBEXIndex *index);
+static void
+index_iterate(struct _IBEXIndex *index)
+{
+ struct _IBEXCursor *idc;
+ int len;
+ char *key;
+ int total = 0, totallen = 0;
+
+ idc = index->klass->get_cursor(index);
+ key = idc->klass->next_key(idc, &len);
+ while (len) {
+ total++;
+ totallen += len;
+ printf("%s\n", key);
+ g_free(key);
+ key = idc->klass->next_key(idc, &len);
+ }
+ g_free(key);
+
+ idc->klass->close(idc);
+
+ printf("Iterate Totals: %d items, total bytes %d\n", total, totallen);
+}
+
int main(int argc, char **argv)
{
ibex *ib;
@@ -26,6 +50,9 @@ int main(int argc, char **argv)
ibex_hash_dump(ib->words->wordindex);
ibex_hash_dump(ib->words->nameindex);
+ index_iterate(ib->words->wordindex);
+ index_iterate(ib->words->nameindex);
+
ibex_close(ib);
return 0;
diff --git a/libibex/hash.c b/libibex/hash.c
index 9395e1e00b..0581d22fcb 100644
--- a/libibex/hash.c
+++ b/libibex/hash.c
@@ -42,6 +42,14 @@
typedef guint32 hashid_t;
+struct _HASHCursor {
+ struct _IBEXCursor cursor;
+
+ hashid_t block;
+ unsigned int index;
+ unsigned int size;
+};
+
static struct _IBEXIndex *hash_create(struct _memcache *bc, int size);
static struct _IBEXIndex *hash_open(struct _memcache *bc, blockid_t root);
static int hash_sync(struct _IBEXIndex *index);
@@ -53,6 +61,12 @@ static hashid_t hash_insert(struct _IBEXIndex *index, const char *key, int keyle
static char *hash_get_key(struct _IBEXIndex *index, hashid_t hashbucket, int *len);
static void hash_set_data_block(struct _IBEXIndex *index, hashid_t keyid, blockid_t blockid, blockid_t tail);
static blockid_t hash_get_data_block(struct _IBEXIndex *index, hashid_t keyid, blockid_t *tail);
+static struct _IBEXCursor *hash_get_cursor(struct _IBEXIndex *index);
+
+static struct _IBEXCursor *hash_cursor_create(struct _IBEXIndex *);
+static void hash_cursor_close(struct _IBEXCursor *);
+static guint32 hash_cursor_next(struct _IBEXCursor *);
+static char *hash_cursor_next_key(struct _IBEXCursor *, int *keylenptr);
struct _IBEXIndexClass ibex_hash_class = {
hash_create, hash_open,
@@ -63,6 +77,13 @@ struct _IBEXIndexClass ibex_hash_class = {
hash_get_key,
hash_set_data_block,
hash_get_data_block,
+ hash_get_cursor,
+};
+
+struct _IBEXCursorClass ibex_hash_cursor_class = {
+ hash_cursor_close,
+ hash_cursor_next,
+ hash_cursor_next_key
};
/* the reason we have the tail here is that otherwise we need to
@@ -197,6 +218,12 @@ static int hash_close(struct _IBEXIndex *index)
return 0;
}
+/* get an iterator class */
+static struct _IBEXCursor *hash_get_cursor(struct _IBEXIndex *index)
+{
+ return hash_cursor_create(index);
+}
+
/* convert a hashbucket id into a name */
static char *
hash_get_key(struct _IBEXIndex *index, hashid_t hashbucket, int *len)
@@ -620,6 +647,74 @@ hash_insert(struct _IBEXIndex *index, const char *key, int keylen)
return HASH_KEY(keybucket, 0);
}
+/* hash cursor functions */
+static struct _IBEXCursor *
+hash_cursor_create(struct _IBEXIndex *idx)
+{
+ struct _HASHCursor *idc;
+ struct _hashroot *hashroot;
+
+ idc = g_malloc(sizeof(*idc));
+ idc->cursor.klass = &ibex_hash_cursor_class;
+ idc->cursor.index = idx;
+ idc->block = 0;
+ idc->index = 0;
+
+ hashroot = (struct _hashroot *)ibex_block_read(idx->blocks, idx->root);
+ idc->size = hashroot->size;
+
+ return &idc->cursor;
+}
+
+static void
+hash_cursor_close(struct _IBEXCursor *idc)
+{
+ g_free(idc);
+}
+
+static guint32
+hash_cursor_next(struct _IBEXCursor *idc)
+{
+ struct _HASHCursor *hc = (struct _HASHCursor *)idc;
+ struct _hashroot *hashroot;
+ struct _hashblock *bucket;
+ struct _hashtableblock *table;
+
+ /* get the next bucket chain */
+ if (hc->block != 0) {
+ int ind;
+
+ bucket = (struct _hashblock *)ibex_block_read(idc->index->blocks, HASH_BLOCK(hc->block));
+ ind = HASH_INDEX(hc->block);
+
+ g_assert(ind < bucket->used);
+
+ hc->block = bucket->hb_keys[ind].next;
+ }
+
+ if (hc->block == 0) {
+ hashroot = (struct _hashroot *)ibex_block_read(idc->index->blocks, idc->index->root);
+ while (hc->block == 0 && hc->index < hc->size) {
+ table = (struct _hashtableblock *)
+ ibex_block_read(idc->index->blocks,
+ hashroot->table[hc->index / (BLOCK_SIZE/sizeof(blockid_t))]);
+ hc->block = table->buckets[hc->index % (BLOCK_SIZE/sizeof(blockid_t))];
+
+ hc->index++;
+ }
+ }
+
+ return hc->block;
+}
+
+static char *
+hash_cursor_next_key(struct _IBEXCursor *idc, int *keylenptr)
+{
+ /* TODO: this could be made slightly mroe efficient going to the structs direct.
+ but i'm lazy today */
+ return idc->index->klass->get_key(idc->index, idc->klass->next(idc), keylenptr);
+}
+
/* debug */
void ibex_hash_dump(struct _IBEXIndex *index);
static void ibex_hash_dump_rec(struct _IBEXIndex *index, int *words, int *wordslen);
diff --git a/libibex/ibex_block.c b/libibex/ibex_block.c
index 8a042cd2cf..7540d48789 100644
--- a/libibex/ibex_block.c
+++ b/libibex/ibex_block.c
@@ -217,6 +217,10 @@ ibex_index_buffer (ibex *ib, char *name, char *buffer, size_t len, size_t *unrea
}
done:
d(printf("name %s count %d size %d\n", name, wordlist->len, len));
+ if (!ib->predone) {
+ ib->words->klass->index_pre(ib->words);
+ ib->predone = TRUE;
+ }
ib->words->klass->add_list(ib->words, name, wordlist);
ret = 0;
error:
@@ -249,6 +253,10 @@ ibex *ibex_open (char *file, int flags, int mode)
int ibex_save (ibex *ib)
{
printf("syncing database\n");
+ if (ib->predone) {
+ ib->words->klass->index_post(ib->words);
+ ib->predone = FALSE;
+ }
ib->words->klass->sync(ib->words);
/* FIXME: some return */
ibex_block_cache_sync(ib->blocks);
@@ -261,6 +269,11 @@ int ibex_close (ibex *ib)
printf("closing database\n");
+ if (ib->predone) {
+ ib->words->klass->index_post(ib->words);
+ ib->predone = FALSE;
+ }
+
ib->words->klass->close(ib->words);
ibex_block_cache_close(ib->blocks);
g_free(ib);
diff --git a/libibex/ibex_internal.h b/libibex/ibex_internal.h
index bd5d1cbea4..db772e4062 100644
--- a/libibex/ibex_internal.h
+++ b/libibex/ibex_internal.h
@@ -24,10 +24,11 @@
#include "block.h"
#include "wordindex.h"
-#define IBEX_VERSION "ibx4"
+#define IBEX_VERSION "ibx5"
struct ibex {
char *path;
struct _memcache *blocks;
struct _IBEXWord *words;
+ int predone;
};
diff --git a/libibex/index.h b/libibex/index.h
index c3c83c1bcf..0cef7948b3 100644
--- a/libibex/index.h
+++ b/libibex/index.h
@@ -27,6 +27,18 @@
#define INDEX_STAT
+struct _IBEXCursor {
+ struct _IBEXCursorClass *klass;
+ struct _IBEXIndex *index;
+};
+
+struct _IBEXCursorClass {
+ void (*close)(struct _IBEXCursor *);
+
+ guint32 (*next)(struct _IBEXCursor *);
+ char *(*next_key)(struct _IBEXCursor *, int *keylenptr);
+};
+
struct _IBEXIndex {
struct _IBEXIndexClass *klass;
struct _memcache *blocks;
@@ -62,6 +74,9 @@ struct _IBEXIndexClass {
/* get the key contents based on the keyid */
blockid_t (*get_data)(struct _IBEXIndex *, guint32 keyid, blockid_t *tail);
+
+ /* get a cursor for iterating over all contents */
+ struct _IBEXCursor *(*get_cursor)(struct _IBEXIndex *);
};
/* a storage class, stores lists of lists of id's */
diff --git a/libibex/wordindex.c b/libibex/wordindex.c
index 62e8859e15..43a91f4342 100644
--- a/libibex/wordindex.c
+++ b/libibex/wordindex.c
@@ -82,9 +82,12 @@ static void add_list(struct _IBEXWord *, const char *name, GPtrArray *words);/*
static int word_sync(struct _IBEXWord *idx);
static int word_flush(struct _IBEXWord *idx);
static int word_close(struct _IBEXWord *idx);
+static void word_index_pre(struct _IBEXWord *idx);
+static void word_index_post(struct _IBEXWord *idx);
struct _IBEXWordClass ibex_word_index_class = {
word_sync, word_flush, word_close,
+ word_index_pre, word_index_post,
unindex_name, contains_name,
find, find_name,
add, add_list
@@ -138,6 +141,14 @@ cache_sanity(struct _wordcache *head)
}
#endif
+static void word_index_pre(struct _IBEXWord *idx)
+{
+}
+
+static void word_index_post(struct _IBEXWord *idx)
+{
+}
+
/* unindex all entries for name */
static void unindex_name(struct _IBEXWord *idx, const char *name)
{
diff --git a/libibex/wordindex.h b/libibex/wordindex.h
index d222ff5a87..353f4dddc6 100644
--- a/libibex/wordindex.h
+++ b/libibex/wordindex.h
@@ -38,6 +38,9 @@ struct _IBEXWordClass {
int (*flush)(struct _IBEXWord *);
int (*close)(struct _IBEXWord *);
+ void (*index_pre)(struct _IBEXWord *); /* get ready for doing a lot of indexing. may be a nop */
+ void (*index_post)(struct _IBEXWord *);
+
void (*unindex_name)(struct _IBEXWord *, const char *name); /* unindex all entries for name */
gboolean (*contains_name)(struct _IBEXWord *, const char *name); /* index contains data for name */
GPtrArray *(*find)(struct _IBEXWord *, const char *word); /* returns all matches for word */
@@ -57,9 +60,13 @@ struct _IBEXWord {
GHashTable *wordcache; /* word->struct _wordcache mapping */
struct _list wordnodes; /* LRU list of wordcache structures */
int wordcount; /* how much space used in cache */
+ int precount;
};
struct _IBEXWord *ibex_create_word_index(struct _memcache *bc, blockid_t *wordroot, blockid_t *nameroot);
+/* alternate implemenation */
+struct _IBEXWord *ibex_create_word_index_mem(struct _memcache *bc, blockid_t *wordroot, blockid_t *nameroot);
+
#endif /* !_WORDINDEX_H */
diff --git a/libibex/wordindexmem.c b/libibex/wordindexmem.c
new file mode 100644
index 0000000000..f0cc7336f8
--- /dev/null
+++ b/libibex/wordindexmem.c
@@ -0,0 +1,721 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2000 Helix Code, Inc.
+ *
+ * Authors: Michael Zucchi <notzed@helixcode.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License
+ * as published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the Gnome Library; see the file COPYING.LIB. If not,
+ * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* this is the same as wordindex.c, but it doesn't have an LRU cache
+ for word names. it has a lookup tab le that is only loaded if
+ index-pre is called, otherwise it always hits disk */
+
+/* code to manage a word index */
+/* includes a cache for word index writes,
+ but not for name index writes (currently), or any reads.
+
+Note the word cache is only needed during indexing of lots
+of words, and could then be discarded (:flush()).
+
+*/
+
+#include <stdio.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <glib.h>
+
+#include "block.h"
+#include "index.h"
+#include "wordindex.h"
+
+/*#define MALLOC_CHECK*/
+
+#ifdef MALLOC_CHECK
+#include <mcheck.h>
+#endif
+
+#define d(x)
+
+/*#define WORDCACHE_SIZE (256)*/
+#define WORDCACHE_SIZE (4096)
+
+extern struct _IBEXStoreClass ibex_diskarray_class;
+extern struct _IBEXIndexClass ibex_hash_class;
+
+/* need 2 types of hash key?
+ one that just stores the wordid / wordblock
+ and one that stores the filecount/files?
+*/
+
+
+#define CACHE_FILE_COUNT (62)
+
+struct _wordcache {
+ nameid_t wordid; /* disk wordid */
+ blockid_t wordblock; /* head of disk list */
+ blockid_t wordtail; /* and the tail data */
+ short filecount; /* how many valid items in files[] */
+ short filealloc; /* how much allocated space in files[] */
+ union {
+ nameid_t *files; /* memory cache of files */
+ nameid_t file0; /* if filecount == 1 && filealloc == 0, store directly */
+ } file;
+ char word[1]; /* actual word follows */
+};
+
+static void unindex_name(struct _IBEXWord *, const char *name); /* unindex all entries for name */
+static gboolean contains_name(struct _IBEXWord *, const char *name); /* index contains data for name */
+static GPtrArray *find(struct _IBEXWord *, const char *word); /* returns all matches for word */
+static gboolean find_name(struct _IBEXWord *, const char *name, const char *word); /* find if name contains word */
+static void add(struct _IBEXWord *, const char *name, const char *word); /* adds a single word to name (slow) */
+static void add_list(struct _IBEXWord *, const char *name, GPtrArray *words);/* adds a bunch of words to a given name */
+static int word_sync(struct _IBEXWord *idx);
+static int word_flush(struct _IBEXWord *idx);
+static int word_close(struct _IBEXWord *idx);
+static void word_index_pre(struct _IBEXWord *idx);
+static void word_index_post(struct _IBEXWord *idx);
+
+static void sync_cache_entry(struct _IBEXWord *idx, struct _wordcache *cache);
+
+struct _IBEXWordClass ibex_word_index_mem_class = {
+ word_sync, word_flush, word_close,
+ word_index_pre, word_index_post,
+ unindex_name, contains_name,
+ find, find_name,
+ add, add_list
+};
+
+#ifdef MALLOC_CHECK
+static void
+checkmem(void *p)
+{
+ if (p) {
+ int status = mprobe(p);
+
+ switch (status) {
+ case MCHECK_HEAD:
+ printf("Memory underrun at %p\n", p);
+ abort();
+ case MCHECK_TAIL:
+ printf("Memory overrun at %p\n", p);
+ abort();
+ case MCHECK_FREE:
+ printf("Double free %p\n", p);
+ abort();
+ }
+ }
+}
+#endif
+
+/* this interface isn't the best, but it'll do for now */
+struct _IBEXWord *
+ibex_create_word_index_mem(struct _memcache *bc, blockid_t *wordroot, blockid_t *nameroot)
+{
+ struct _IBEXWord *idx;
+
+ idx = g_malloc0(sizeof(*idx));
+ idx->wordcache = g_hash_table_new(g_str_hash, g_str_equal);
+ ibex_list_new(&idx->wordnodes);
+ idx->wordcount = 0;
+ idx->precount = 0;
+ idx->klass = &ibex_word_index_mem_class;
+
+ /* we use the same block array storage for both indexes at the moment */
+ idx->wordstore = ibex_diskarray_class.create(bc);
+ idx->namestore = idx->wordstore;
+
+ /* but not the same indexes! */
+ if (*wordroot) {
+ printf("opening wordindex root = %d\n", *wordroot);
+ idx->wordindex = ibex_hash_class.open(bc, *wordroot);
+ } else {
+ idx->wordindex = ibex_hash_class.create(bc, 2048);
+ *wordroot = idx->wordindex->root;
+ printf("creating wordindex root = %d\n", *wordroot);
+ }
+ if (*nameroot) {
+ printf("opening nameindex root = %d\n", *nameroot);
+ idx->nameindex = ibex_hash_class.open(bc, *nameroot);
+ } else {
+ idx->nameindex = ibex_hash_class.create(bc, 2048);
+ *nameroot = idx->nameindex->root;
+ printf("creating nameindex root = %d\n", *nameroot);
+ }
+ return idx;
+}
+
+static void
+node_sanity(char *key, struct _wordcache *node, void *data)
+{
+ g_assert(node->filecount <= node->filealloc || (node->filecount == 1 && node->filealloc == 0));
+ g_assert(strlen(node->word) != 0);
+#ifdef MALLOC_CHECK
+ checkmem(node);
+ if (node->filealloc)
+ checkmem(node->file.files);
+#endif
+}
+
+static void
+cache_sanity(struct _IBEXWord *idx)
+{
+#ifdef MALLOC_CHECK
+ checkmem(idx);
+#endif
+ g_hash_table_foreach(idx->wordcache, (GHFunc)node_sanity, idx);
+}
+
+static void word_index_pre(struct _IBEXWord *idx)
+{
+ struct _IBEXCursor *idc;
+ struct _wordcache *cache;
+ nameid_t wordid;
+ char *key;
+ int len;
+
+ idx->precount ++;
+ if (idx->precount > 1)
+ return;
+
+ /* want to load all words into the cache lookup table */
+ printf("pre-loading all word info into memory\n");
+ idc = idx->wordindex->klass->get_cursor(idx->wordindex);
+ while ( (wordid = idc->klass->next(idc)) ) {
+ key = idc->index->klass->get_key(idc->index, wordid, &len);
+ /*d(printf("Adding word %s\n", key));*/
+ cache = g_malloc0(sizeof(*cache) + strlen(key));
+ strcpy(cache->word, key);
+ g_free(key);
+ cache->wordid = wordid;
+ cache->wordblock = idc->index->klass->get_data(idc->index, wordid, &cache->wordtail);
+ cache->filecount = 0;
+ cache->filealloc = 0;
+ g_hash_table_insert(idx->wordcache, cache->word, cache);
+ idx->wordcount++;
+ }
+
+#ifdef MALLOC_CHECK
+ cache_sanity(idx);
+#endif
+
+ idc->klass->close(idc);
+
+ printf("done\n");
+}
+
+static gboolean
+sync_free_value(void *key, void *value, void *data)
+{
+ struct _wordcache *cache = (struct _wordcache *)value;
+ struct _IBEXWord *idx = (struct _IBEXWord *)data;
+
+ sync_cache_entry(idx, cache);
+ if (cache->filealloc)
+ g_free(cache->file.files);
+ g_free(cache);
+
+ return TRUE;
+}
+
+static void
+sync_value(void *key, void *value, void *data)
+{
+ struct _wordcache *cache = (struct _wordcache *)value;
+ struct _IBEXWord *idx = (struct _IBEXWord *)data;
+
+ sync_cache_entry(idx, cache);
+}
+
+static void word_index_post(struct _IBEXWord *idx)
+{
+ idx->precount--;
+ if (idx->precount > 0)
+ return;
+ idx->precount = 0;
+
+#ifdef MALLOC_CHECK
+ cache_sanity(idx);
+#endif
+
+ g_hash_table_foreach_remove(idx->wordcache, sync_free_value, idx);
+ idx->wordcount = 0;
+}
+
+/* unindex all entries for name */
+static void unindex_name(struct _IBEXWord *idx, const char *name)
+{
+ GArray *words;
+ int i;
+ nameid_t nameid, wordid;
+ blockid_t nameblock, wordblock, newblock, nametail, wordtail, newtail;
+ char *word;
+ struct _wordcache *cache;
+
+ d(printf("unindexing %s\n", name));
+
+ /* lookup the hash key */
+ nameid = idx->nameindex->klass->find(idx->nameindex, name, strlen(name));
+ /* get the block for this key */
+ nameblock = idx->nameindex->klass->get_data(idx->nameindex, nameid, &nametail);
+ /* and the data for this block */
+ words = idx->namestore->klass->get(idx->namestore, nameblock, nametail);
+ /* walk it ... */
+ for (i=0;i<words->len;i++) {
+ /* get the word */
+ wordid = g_array_index(words, nameid_t, i);
+ d(printf(" word %d\n", wordid));
+ /* get the data block */
+ wordblock = idx->wordindex->klass->get_data(idx->wordindex, wordid, &wordtail);
+ /* clear this name from it */
+ newblock = wordblock;
+ newtail = wordtail;
+ idx->wordstore->klass->remove(idx->wordstore, &newblock, &newtail, nameid);
+ if (newblock != wordblock || newtail != wordtail)
+ idx->wordindex->klass->set_data(idx->wordindex, wordid, newblock, newtail);
+
+ /* now check the cache as well */
+ word = idx->nameindex->klass->get_key(idx->wordindex, wordid, NULL);
+ if (word) {
+ cache = g_hash_table_lookup(idx->wordcache, word);
+ if (cache) {
+ /* its there, update our head/tail pointers */
+ cache->wordblock = newblock;
+ cache->wordtail = newtail;
+
+ /* now check that we have a data entry in it */
+ if (cache->filealloc == 0 && cache->filecount == 1) {
+ if (cache->file.file0 == nameid) {
+ cache->filecount = 0;
+ }
+ } else {
+ int j;
+
+ for (j=0;j<cache->filecount;j++) {
+ if (cache->file.files[j] == nameid) {
+ cache->file.files[j] = cache->file.files[cache->filecount-1];
+ cache->filecount--;
+ break;
+ }
+ }
+ }
+ }
+ g_free(word);
+ }
+ }
+ g_array_free(words, TRUE);
+
+ /* and remove name data and itself */
+ idx->namestore->klass->free(idx->namestore, nameblock, nametail);
+ idx->nameindex->klass->remove(idx->nameindex, name, strlen(name));
+}
+
+/* index contains (any) data for name */
+static gboolean contains_name(struct _IBEXWord *idx, const char *name)
+{
+ return idx->nameindex->klass->find(idx->nameindex, name, strlen(name)) != 0;
+}
+
+/* returns all matches for word */
+static GPtrArray *find(struct _IBEXWord *idx, const char *word)
+{
+ nameid_t wordid, nameid;
+ GPtrArray *res;
+ GArray *names;
+ int i;
+ char *new;
+ struct _wordcache *cache;
+ blockid_t wordblock, wordtail;
+
+ res = g_ptr_array_new();
+
+ cache = g_hash_table_lookup(idx->wordcache, word);
+ if (cache) {
+#if 0
+ /* freshen cache entry if we touch it */
+ ibex_list_remove((struct _listnode *)cache);
+ ibex_list_addtail(&idx->wordnodes, (struct _listnode *)cache);
+#endif
+ wordid = cache->wordid;
+ wordblock = cache->wordblock;
+ wordtail = cache->wordtail;
+ } else {
+ /* lookup the hash key */
+ wordid = idx->wordindex->klass->find(idx->wordindex, word, strlen(word));
+ /* get the block for this key */
+ wordblock = idx->wordindex->klass->get_data(idx->wordindex, wordid, &wordtail);
+ }
+ /* and the data for this block */
+ names = idx->wordstore->klass->get(idx->wordstore, wordblock, wordtail);
+ /* .. including any memory-only data */
+ if (cache) {
+ if (cache->filealloc == 0 && cache->filecount == 1)
+ g_array_append_val(names, cache->file.file0);
+ else
+ g_array_append_vals(names, cache->file.files, cache->filecount);
+ }
+
+ /* walk it ... converting id's back to strings */
+ g_ptr_array_set_size(res, names->len);
+ for (i=0;i<names->len;i++) {
+ nameid = g_array_index(names, nameid_t, i);
+ new = idx->nameindex->klass->get_key(idx->nameindex, nameid, NULL);
+ res->pdata[i] = new;
+ }
+ g_array_free(names, TRUE);
+ return res;
+}
+
+/* find if name contains word */
+static gboolean find_name(struct _IBEXWord *idx, const char *name, const char *word)
+{
+ nameid_t wordid, nameid;
+ blockid_t nameblock, nametail;
+ struct _wordcache *cache;
+ int i;
+
+ /* lookup the hash key for the name */
+ nameid = idx->nameindex->klass->find(idx->nameindex, name, strlen(name));
+ /* get the block for this name */
+ nameblock = idx->nameindex->klass->get_data(idx->nameindex, nameid, &nametail);
+
+ /* check if there is an in-memory cache for this word, check its file there first */
+ cache = g_hash_table_lookup(idx->wordcache, word);
+ if (cache) {
+#if 0
+ /* freshen cache entry if we touch it */
+ ibex_list_remove((struct _listnode *)cache);
+ ibex_list_addtail(&idx->wordnodes, (struct _listnode *)cache);
+#endif
+ if (cache->filecount == 1 && cache->filealloc == 0) {
+ if (cache->file.file0 == nameid)
+ return TRUE;
+ } else {
+ for (i=0;i<cache->filecount;i++) {
+ if (cache->file.files[i] == nameid)
+ return TRUE;
+ }
+ }
+ /* not there? well we can use the wordid anyway */
+ wordid = cache->wordid;
+ } else {
+ /* lookup the hash key for word */
+ wordid = idx->wordindex->klass->find(idx->wordindex, word, strlen(word));
+ }
+
+ /* see if wordid is in nameblock */
+ return idx->namestore->klass->find(idx->namestore, nameblock, nametail, wordid);
+}
+
+/* cache helper functions */
+/* flush a cache entry to disk, and empty it out */
+static void
+sync_cache_entry(struct _IBEXWord *idx, struct _wordcache *cache)
+{
+ GArray array; /* just use this as a header */
+ blockid_t oldblock, oldtail;
+
+ if (cache->filecount == 0)
+ return;
+
+ d(printf("syncing cache entry '%s' used %d\n", cache->word, cache->filecount));
+ if (cache->filecount == 1 && cache->filealloc == 0)
+ array.data = (char *)&cache->file.file0;
+ else
+ array.data = (char *)cache->file.files;
+ array.len = cache->filecount;
+ oldblock = cache->wordblock;
+ oldtail = cache->wordtail;
+ idx->wordstore->klass->add_list(idx->wordstore, &cache->wordblock, &cache->wordtail, &array);
+ if (oldblock != cache->wordblock || oldtail != cache->wordtail) {
+ idx->wordindex->klass->set_data(idx->wordindex, cache->wordid, cache->wordblock, cache->wordtail);
+ }
+ cache->filecount = 0;
+}
+
+/* create a new key in an index, returning its id and head block */
+static void
+add_index_key(struct _IBEXIndex *wordindex, const char *word, nameid_t *wordid, blockid_t *wordblock, blockid_t *wordtail)
+{
+ /* initialise cache entry - id of word entry and head block */
+ *wordid = wordindex->klass->find(wordindex, word, strlen(word));
+
+ if (*wordid == 0) {
+ *wordid = wordindex->klass->insert(wordindex, word, strlen(word));
+ *wordblock = 0;
+ *wordtail = 0;
+ } else {
+ *wordblock = wordindex->klass->get_data(wordindex, *wordid, wordtail);
+ }
+}
+
+/* create a new key in a cached index (only word cache so far), flushing old keys
+ if too much space is being used */
+static struct _wordcache *
+add_index_cache(struct _IBEXWord *idx, const char *word)
+{
+ struct _wordcache *cache;
+
+ cache = g_hash_table_lookup(idx->wordcache, word);
+ if (cache == 0) {
+ /*d(printf("adding %s to cache\n", word));*/
+
+#if 0
+ /* see if we have to flush off the last entry */
+ if (idx->wordcount >= WORDCACHE_SIZE) {
+ struct _wordcache *mincache;
+ int min, count=0;
+ /* remove last entry, and flush it */
+ cache = (struct _wordcache *)idx->wordnodes.tailpred;
+ mincache = cache;
+ min = mincache->filecount;
+
+ d(printf("flushing word from cache %s\n", cache->word));
+ /* instead of just using the last entry, we try and find an entry with
+ with only 1 item (failing that, the smallest in the range we look at) */
+ /* this could probably benefit greatly from a more sophisticated aging algorithm */
+ while (cache->next && count < 100) {
+ if (cache->filecount == 1) {
+ mincache = cache;
+ break;
+ }
+ if (cache->filecount > 0 && cache->filecount < min) {
+ mincache = cache;
+ min = cache->filecount;
+ }
+ cache = cache->next;
+ count++;
+ }
+ ibex_list_remove((struct _listnode *)mincache);
+ g_hash_table_remove(idx->wordcache, mincache->word);
+ sync_cache_entry(idx, mincache);
+ if (mincache->filealloc)
+ g_free(mincache->file.files);
+ g_free(mincache);
+ idx->wordcount--;
+ }
+#endif
+ cache = g_malloc0(sizeof(*cache)+strlen(word));
+ /* if we're in an index state, we can assume we dont have it if we dont have it in memory */
+ if (idx->precount == 0) {
+ /* initialise cache entry - id of word entry and head block */
+ add_index_key(idx->wordindex, word, &cache->wordid, &cache->wordblock, &cache->wordtail);
+ } else {
+ cache->wordid = idx->wordindex->klass->insert(idx->wordindex, word, strlen(word));
+ }
+ /* other fields */
+ strcpy(cache->word, word);
+ cache->filecount = 0;
+ g_hash_table_insert(idx->wordcache, cache->word, cache);
+#if 0
+ ibex_list_addhead(&idx->wordnodes, (struct _listnode *)cache);
+#endif
+ idx->wordcount++;
+ } else {
+ /*d(printf("already have %s in cache\n", word));*/
+#if 0
+ /* move cache bucket ot the head of the cache list */
+ ibex_list_remove((struct _listnode *)cache);
+ ibex_list_addhead(&idx->wordnodes, (struct _listnode *)cache);
+#endif
+ }
+ return cache;
+}
+
+/* adds a single word to name (slow) */
+static void add(struct _IBEXWord *idx, const char *name, const char *word)
+{
+ nameid_t nameid;
+ blockid_t nameblock, newblock, nametail, newtail;
+ struct _wordcache *cache;
+
+ g_error("Dont use wordindex::add()");
+ abort();
+
+ cache = add_index_cache(idx, word);
+
+ /* get the nameid and block start for this name */
+ add_index_key(idx->nameindex, name, &nameid, &nameblock, &nametail);
+
+ /* check for repeats of the last name - dont add anything */
+ if (cache->filecount == 1 && cache->filealloc == 0) {
+ if (cache->file.file0 == nameid)
+ return;
+ } else {
+ if (cache->file.files[cache->filecount] == nameid)
+ return;
+ }
+
+ /* see if we are setting the first, drop it in the union */
+ if (cache->filecount == 0 && cache->filealloc == 0) {
+ cache->file.file0 = nameid;
+ } else if (cache->filecount == 1 && cache->filealloc == 0) {
+ nameid_t saveid;
+ /* we need to allocate space for words */
+ saveid = cache->file.file0;
+ cache->file.files = g_malloc(sizeof(cache->file.files[0]) * CACHE_FILE_COUNT);
+ /* this could possibly grow as needed, but i wont for now */
+ cache->filealloc = CACHE_FILE_COUNT;
+ cache->file.files[0] = saveid;
+ cache->file.files[1] = nameid;
+ } else {
+ cache->file.files[cache->filecount] = nameid;
+ }
+
+ cache->filecount++;
+
+ /* if we are full, force a flush now */
+ if (cache->filealloc && cache->filecount >= cache->filealloc) {
+ sync_cache_entry(idx, cache);
+ }
+
+ newtail = nametail;
+ newblock = nameblock;
+ idx->namestore->klass->add(idx->namestore, &newblock, &newtail, cache->wordid);
+ if (newblock != nameblock || newtail != nametail) {
+ idx->nameindex->klass->set_data(idx->nameindex, nameid, newblock, newtail);
+ }
+}
+
+/* adds a bunch of words to a given name */
+static void add_list(struct _IBEXWord *idx, const char *name, GPtrArray *words)
+{
+ int i;
+ GArray *data = g_array_new(0, 0, sizeof(nameid_t));
+ blockid_t nameblock, newblock, nametail, newtail;
+ nameid_t nameid;
+ struct _wordcache *cache;
+
+ d(printf("Adding words to name %s\n", name));
+
+ d(cache_sanity(idx));
+
+ /* get the nameid and block start for this name */
+ add_index_key(idx->nameindex, name, &nameid, &nameblock, &nametail);
+
+ d(cache_sanity(idx));
+
+ for (i=0;i<words->len;i++) {
+ char *word = words->pdata[i];
+
+ cache = add_index_cache(idx, word);
+
+ /*d(cache_sanity(idx));*/
+
+ /* check for duplicates; doesn't catch duplicates over an overflow boundary. Watch me care. */
+ if (cache->filecount == 0
+ /* the 1 item case */
+ || (cache->filecount == 1 && cache->filealloc == 0 && cache->file.file0 != nameid)
+ /* the normal case */
+ || (cache->filealloc > 0 && cache->file.files[cache->filecount-1] != nameid)) {
+
+ /* see if we are setting the first, drop it in the union */
+ if (cache->filecount == 0 && cache->filealloc == 0) {
+ cache->file.file0 = nameid;
+ } else if (cache->filecount == 1 && cache->filealloc == 0) {
+ nameid_t saveid;
+ /* we need to allocate space for words */
+ saveid = cache->file.file0;
+ cache->file.files = g_malloc(sizeof(cache->file.files[0]) * CACHE_FILE_COUNT);
+ /* this could possibly grow as needed, but i wont for now */
+ cache->filealloc = CACHE_FILE_COUNT;
+ cache->file.files[0] = saveid;
+ cache->file.files[1] = nameid;
+ } else {
+ cache->file.files[cache->filecount] = nameid;
+ }
+
+ cache->filecount++;
+
+ /* if we are full, force a flush now */
+ if (cache->filealloc && cache->filecount >= cache->filealloc) {
+ sync_cache_entry(idx, cache);
+ }
+
+ /*d(cache_sanity(idx));*/
+
+ /* and append this wordid for this name in memory */
+ g_array_append_val(data, cache->wordid);
+ }
+
+ /*d(cache_sanity(idx));*/
+ }
+
+ d(cache_sanity(idx));
+
+ /* and append these word id's in one go */
+ newblock = nameblock;
+ newtail = nametail;
+ idx->namestore->klass->add_list(idx->namestore, &newblock, &newtail, data);
+ if (newblock != nameblock || newtail != nametail) {
+ idx->nameindex->klass->set_data(idx->nameindex, nameid, newblock, newtail);
+ }
+
+ d(cache_sanity(idx));
+
+ g_array_free(data, TRUE);
+}
+
+/* sync any in-memory data to disk */
+static int
+word_sync(struct _IBEXWord *idx)
+{
+ /* we just flush also, save memory */
+ word_flush(idx);
+
+#if 0
+ struct _wordcache *cache = (struct _wordcache *)idx->wordnodes.head;
+
+ while (cache->next) {
+ sync_cache_entry(idx, cache);
+ cache = cache->next;
+ }
+
+ /*ibex_hash_dump(idx->wordindex);*/
+ /*ibex_hash_dump(idx->nameindex);*/
+#endif
+ return 0;
+}
+
+/* sync and flush any in-memory data to disk and free it */
+static int
+word_flush(struct _IBEXWord *idx)
+{
+ d(cache_sanity(idx));
+
+ g_hash_table_foreach_remove(idx->wordcache, sync_free_value, idx);
+ idx->wordcount = 0;
+ return 0;
+}
+
+static int word_close(struct _IBEXWord *idx)
+{
+ idx->klass->flush(idx);
+
+ idx->namestore->klass->close(idx->namestore);
+ idx->nameindex->klass->close(idx->nameindex);
+ /*same as namestore:
+ idx->wordstore->klass->close(idx->wordstore);*/
+ idx->wordindex->klass->close(idx->wordindex);
+ g_hash_table_destroy(idx->wordcache);
+ g_free(idx);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 23:45:27 +0800