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-rw-r--r--storage/tokudb/PerconaFT/ft/logger/logfilemgr.cc205
1 files changed, 205 insertions, 0 deletions
diff --git a/storage/tokudb/PerconaFT/ft/logger/logfilemgr.cc b/storage/tokudb/PerconaFT/ft/logger/logfilemgr.cc
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+++ b/storage/tokudb/PerconaFT/ft/logger/logfilemgr.cc
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+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
+#ident "$Id$"
+/*======
+This file is part of PerconaFT.
+
+
+Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
+
+ PerconaFT is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License, version 2,
+ as published by the Free Software Foundation.
+
+ PerconaFT 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 PerconaFT. If not, see <http://www.gnu.org/licenses/>.
+
+----------------------------------------
+
+ PerconaFT is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License, version 3,
+ as published by the Free Software Foundation.
+
+ PerconaFT 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
+======= */
+
+#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
+
+#include <my_global.h>
+#include "logger/log-internal.h"
+#include "logger/logcursor.h"
+#include "logger/logfilemgr.h"
+
+// for now, implement with singlely-linked-list
+// first = oldest (delete from beginning)
+// last = newest (add to end)
+
+struct lfm_entry {
+ TOKULOGFILEINFO lf_info;
+ struct lfm_entry *next;
+};
+
+struct toku_logfilemgr {
+ struct lfm_entry *first;
+ struct lfm_entry *last;
+ int n_entries;
+};
+
+int toku_logfilemgr_create(TOKULOGFILEMGR *lfm) {
+ // malloc a logfilemgr
+ TOKULOGFILEMGR XMALLOC(mgr);
+ mgr->first = NULL;
+ mgr->last = NULL;
+ mgr->n_entries = 0;
+ *lfm = mgr;
+ return 0;
+}
+
+int toku_logfilemgr_destroy(TOKULOGFILEMGR *lfm) {
+ int r=0;
+ if ( *lfm != NULL ) { // be tolerant of being passed a NULL
+ TOKULOGFILEMGR mgr = *lfm;
+ while ( mgr->n_entries > 0 ) {
+ toku_logfilemgr_delete_oldest_logfile_info(mgr);
+ }
+ toku_free(*lfm);
+ *lfm = NULL;
+ }
+ return r;
+}
+
+int toku_logfilemgr_init(TOKULOGFILEMGR lfm, const char *log_dir, TXNID *last_xid_if_clean_shutdown) {
+ invariant_notnull(lfm);
+ invariant_notnull(last_xid_if_clean_shutdown);
+
+ int r;
+ int n_logfiles;
+ char **logfiles;
+ r = toku_logger_find_logfiles(log_dir, &logfiles, &n_logfiles);
+ if (r!=0)
+ return r;
+
+ TOKULOGCURSOR cursor;
+ struct log_entry *entry;
+ TOKULOGFILEINFO lf_info;
+ long long index = -1;
+ char *basename;
+ LSN tmp_lsn = {0};
+ TXNID last_xid = TXNID_NONE;
+ for(int i=0;i<n_logfiles;i++){
+ XMALLOC(lf_info);
+ // find the index
+ // basename is the filename of the i-th logfile
+ basename = strrchr(logfiles[i], '/') + 1;
+ int version;
+ r = sscanf(basename, "log%lld.tokulog%d", &index, &version);
+ assert(r==2); // found index and version
+ assert(version>=TOKU_LOG_MIN_SUPPORTED_VERSION);
+ assert(version<=TOKU_LOG_VERSION);
+ lf_info->index = index;
+ lf_info->version = version;
+ // find last LSN in logfile
+ r = toku_logcursor_create_for_file(&cursor, log_dir, basename);
+ if (r!=0) {
+ return r;
+ }
+ r = toku_logcursor_last(cursor, &entry); // set "entry" to last log entry in logfile
+ if (r == 0) {
+ lf_info->maxlsn = toku_log_entry_get_lsn(entry);
+
+ invariant(lf_info->maxlsn.lsn >= tmp_lsn.lsn);
+ tmp_lsn = lf_info->maxlsn;
+ if (entry->cmd == LT_shutdown) {
+ last_xid = entry->u.shutdown.last_xid;
+ } else {
+ last_xid = TXNID_NONE;
+ }
+ }
+ else {
+ lf_info->maxlsn = tmp_lsn; // handle empty logfile (no LSN in file) case
+ }
+
+ // add to logfilemgr
+ toku_logfilemgr_add_logfile_info(lfm, lf_info);
+ toku_logcursor_destroy(&cursor);
+ }
+ toku_logger_free_logfiles(logfiles, n_logfiles);
+ *last_xid_if_clean_shutdown = last_xid;
+ return 0;
+}
+
+int toku_logfilemgr_num_logfiles(TOKULOGFILEMGR lfm) {
+ assert(lfm);
+ return lfm->n_entries;
+}
+
+int toku_logfilemgr_add_logfile_info(TOKULOGFILEMGR lfm, TOKULOGFILEINFO lf_info) {
+ assert(lfm);
+ struct lfm_entry *XMALLOC(entry);
+ entry->lf_info = lf_info;
+ entry->next = NULL;
+ if ( lfm->n_entries != 0 )
+ lfm->last->next = entry;
+ lfm->last = entry;
+ lfm->n_entries++;
+ if (lfm->n_entries == 1 ) {
+ lfm->first = lfm->last;
+ }
+ return 0;
+}
+
+TOKULOGFILEINFO toku_logfilemgr_get_oldest_logfile_info(TOKULOGFILEMGR lfm) {
+ assert(lfm);
+ return lfm->first->lf_info;
+}
+
+void toku_logfilemgr_delete_oldest_logfile_info(TOKULOGFILEMGR lfm) {
+ assert(lfm);
+ if ( lfm->n_entries > 0 ) {
+ struct lfm_entry *entry = lfm->first;
+ toku_free(entry->lf_info);
+ lfm->first = entry->next;
+ toku_free(entry);
+ lfm->n_entries--;
+ if ( lfm->n_entries == 0 ) {
+ lfm->last = lfm->first = NULL;
+ }
+ }
+}
+
+LSN toku_logfilemgr_get_last_lsn(TOKULOGFILEMGR lfm) {
+ assert(lfm);
+ if ( lfm->n_entries == 0 ) {
+ LSN lsn;
+ lsn.lsn = 0;
+ return lsn;
+ }
+ return lfm->last->lf_info->maxlsn;
+}
+
+void toku_logfilemgr_update_last_lsn(TOKULOGFILEMGR lfm, LSN lsn) {
+ assert(lfm);
+ assert(lfm->last!=NULL);
+ lfm->last->lf_info->maxlsn = lsn;
+}
+
+void toku_logfilemgr_print(TOKULOGFILEMGR lfm) {
+ assert(lfm);
+ printf("toku_logfilemgr_print [%p] : %d entries \n", lfm, lfm->n_entries);
+ struct lfm_entry *entry = lfm->first;
+ for (int i=0;i<lfm->n_entries;i++) {
+ printf(" entry %d : index = %" PRId64 ", maxlsn = %" PRIu64 "\n", i, entry->lf_info->index, entry->lf_info->maxlsn.lsn);
+ entry = entry->next;
+ }
+}
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