114 lines
4.9 KiB
C
114 lines
4.9 KiB
C
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/*---
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This software is copyrighted by the Regents of the University of
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California, and other parties. The following terms apply to all files
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associated with the software unless explicitly disclaimed in
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individual files.
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The authors hereby grant permission to use, copy, modify, distribute,
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and license this software and its documentation for any purpose,
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provided that existing copyright notices are retained in all copies
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and that this notice is included verbatim in any distributions. No
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written agreement, license, or royalty fee is required for any of the
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authorized uses. Modifications to this software may be copyrighted by
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their authors and need not follow the licensing terms described here,
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provided that the new terms are clearly indicated on the first page of
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each file where they apply.
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IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY
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FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
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DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND
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THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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GOVERNMENT USE: If you are acquiring this software on behalf of the
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U.S. government, the Government shall have only "Restricted Rights" in
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the software and related documentation as defined in the Federal
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Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you are
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acquiring the software on behalf of the Department of Defense, the
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software shall be classified as "Commercial Computer Software" and the
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Government shall have only "Restricted Rights" as defined in Clause
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252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the
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authors grant the U.S. Government and others acting in its behalf
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permission to use and distribute the software in accordance with the
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terms specified in this license.
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---*/
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#include <lladd/operations.h>
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#include <lladd/logger/logWriter.h>
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#include <lladd/bufferManager.h>
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#include <assert.h>
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Operation operationsTable[MAX_OPERATIONS];
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void doUpdate(const LogEntry * e) {
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operationsTable[e->contents.update.funcID].run(e->xid, e->contents.update.rid, getUpdateArgs(e));
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}
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void redoUpdate(const LogEntry * e) {
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if(e->type == UPDATELOG) {
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#ifdef DEBUGGING
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recordid rid = e->contents.update.rid;
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#endif
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if(e->LSN > readLSN(e->contents.update.rid.page)) {
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DEBUG("Redo, %ld {%d %d %d}\n", e->LSN, rid.page, rid.slot, rid.size);
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doUpdate(e);
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} else {
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DEBUG("Skipping redo, %ld {%d %d %d}\n", e->LSN, rid.page, rid.slot, rid.size);
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}
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} else if(e->type == CLRLOG) {
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LogEntry * f = readLSNEntry(e->contents.clr.thisUpdateLSN);
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#ifdef DEBUGGING
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recordid rid = f->contents.update.rid;
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#endif
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/* See if the page contains the result of the undo that this CLR is supposed to perform. If it
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doesn't, then undo the original operation. */
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if(f->LSN > readLSN(e->contents.update.rid.page)) {
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DEBUG("Undoing for clr, %ld {%d %d %d}\n", f->LSN, rid.page, rid.slot, rid.size);
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undoUpdate(f);
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} else {
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DEBUG("Skiping undo for clr, %ld {%d %d %d}\n", f->LSN, rid.page, rid.slot, rid.size);
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}
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} else {
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assert(0);
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}
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}
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void undoUpdate(const LogEntry * e) {
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int undo = operationsTable[e->contents.update.funcID].undo;
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/* printf("FuncID: %d Undo op: %d\n",e->contents.update.funcID, undo); fflush(NULL); */
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if(e->LSN <= readLSN(e->contents.update.rid.page)) {
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#ifdef DEBUGGING
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recordid rid = e->contents.update.rid;
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#endif
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/* Actually execute the undo */
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if(undo == NO_INVERSE) {
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/* Physical undo */
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DEBUG("Physical undo, %ld {%d %d %d}\n", e->LSN, rid.page, rid.slot, rid.size);
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/** @todo Why were we passing in RECOVERY_XID? */
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writeRecord(e->xid, e->contents.update.rid, getUpdatePreImage(e));
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} else {
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/* @see doUpdate() */
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/* printf("Logical undo"); fflush(NULL); */
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DEBUG("Logical undo, %ld {%d %d %d}\n", e->LSN, rid.page, rid.slot, rid.size);
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operationsTable[undo].run(e->xid, e->contents.update.rid, getUpdateArgs(e));
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}
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}
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/* printf("Undo done."); fflush(NULL); */
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}
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