mirror of https://gitee.com/bigwinds/arangodb
486 lines
15 KiB
C
486 lines
15 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief (binary) shape collection
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2011 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Copyright 2011, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "shape-collection.h"
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#include <BasicsC/conversions.h>
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#include <BasicsC/files.h>
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#include <BasicsC/logging.h>
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#include <BasicsC/strings.h>
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates a journal
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////////////////////////////////////////////////////////////////////////////////
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static bool CreateJournal (TRI_shape_collection_t* collection) {
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TRI_col_header_marker_t cm;
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TRI_datafile_t* journal;
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TRI_df_marker_t* position;
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bool ok;
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int res;
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char* filename;
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char* jname;
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char* number;
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number = TRI_StringUInt32(TRI_NewTickVocBase());
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if (!number) {
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return false;
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}
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jname = TRI_Concatenate3String("journal-", number, ".db");
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TRI_FreeString(TRI_CORE_MEM_ZONE, number);
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filename = TRI_Concatenate2File(collection->base._directory, jname);
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TRI_FreeString(TRI_CORE_MEM_ZONE, jname);
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journal = TRI_CreateDatafile(filename, collection->base._maximalSize);
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// check that a journal was created
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if (journal == NULL) {
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if (TRI_errno() == TRI_ERROR_OUT_OF_MEMORY_MMAP) {
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collection->base._lastError = TRI_set_errno(TRI_ERROR_OUT_OF_MEMORY_MMAP);
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collection->base._state = TRI_COL_STATE_READ;
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}
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else {
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collection->base._lastError = TRI_set_errno(TRI_ERROR_ARANGO_NO_JOURNAL);
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collection->base._state = TRI_COL_STATE_WRITE_ERROR;
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}
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LOG_ERROR("cannot create new journal '%s': %s", filename, TRI_last_error());
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TRI_FreeString(TRI_CORE_MEM_ZONE, filename);
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return false;
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}
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TRI_FreeString(TRI_CORE_MEM_ZONE, filename);
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LOG_TRACE("created a new journal '%s'", journal->_filename);
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// and use the correct name
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number = TRI_StringUInt32(journal->_fid);
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jname = TRI_Concatenate3String("journal-", number, ".db");
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filename = TRI_Concatenate2File(collection->base._directory, jname);
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TRI_FreeString(TRI_CORE_MEM_ZONE, number);
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TRI_FreeString(TRI_CORE_MEM_ZONE, jname);
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ok = TRI_RenameDatafile(journal, filename);
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if (! ok) {
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LOG_WARNING("failed to rename the journal to '%s': %s", filename, TRI_last_error());
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}
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else {
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LOG_TRACE("renamed journal to '%s'", filename);
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}
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TRI_FreeString(TRI_UNKNOWN_MEM_ZONE, filename);
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// create a collection header
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res = TRI_ReserveElementDatafile(journal, sizeof(TRI_col_header_marker_t), &position);
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if (res != TRI_ERROR_NO_ERROR) {
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TRI_FreeDatafile(journal);
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LOG_ERROR("cannot create document header in journal '%s': %s",
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journal->_filename,
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TRI_last_error());
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return false;
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}
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// create a header
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memset(&cm, 0, sizeof(cm));
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cm.base._size = sizeof(TRI_col_header_marker_t);
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cm.base._type = TRI_COL_MARKER_HEADER;
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cm.base._tick = TRI_NewTickVocBase();
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cm._cid = collection->base._cid;
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TRI_FillCrcMarkerDatafile(&cm.base, sizeof(cm), 0, 0);
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// on journal creation, always use waitForSync = true
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res = TRI_WriteElementDatafile(journal, position, &cm.base, sizeof(cm), 0, 0, true);
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if (res != TRI_ERROR_NO_ERROR) {
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TRI_FreeDatafile(journal);
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LOG_ERROR("cannot create document header in journal '%s': %s",
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journal->_filename,
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TRI_last_error());
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return false;
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}
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// that's it
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TRI_PushBackVectorPointer(&collection->base._journals, journal);
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief closes a journal
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////////////////////////////////////////////////////////////////////////////////
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static bool CloseJournal (TRI_shape_collection_t* collection, TRI_datafile_t* journal) {
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bool ok;
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char* dname;
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char* filename;
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char* number;
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int res;
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size_t i;
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size_t n;
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// remove datafile from list of journals
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n = collection->base._journals._length;
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for (i = 0; i < n; ++i) {
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TRI_datafile_t* df;
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df = collection->base._journals._buffer[i];
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if (journal == df) {
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break;
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}
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}
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if (i == n) {
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TRI_set_errno(TRI_ERROR_ARANGO_NO_JOURNAL);
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return false;
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}
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// seal and rename datafile
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res = TRI_SealDatafile(journal);
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if (res != TRI_ERROR_NO_ERROR) {
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collection->base._state = TRI_COL_STATE_WRITE_ERROR;
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return false;
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}
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number = TRI_StringUInt32(journal->_fid);
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dname = TRI_Concatenate3String("datafile-", number, ".db");
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filename = TRI_Concatenate2File(collection->base._directory, dname);
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TRI_FreeString(TRI_CORE_MEM_ZONE, dname);
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TRI_FreeString(TRI_CORE_MEM_ZONE, number);
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ok = TRI_RenameDatafile(journal, filename);
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if (! ok) {
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collection->base._state = TRI_COL_STATE_WRITE_ERROR;
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return false;
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}
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LOG_TRACE("closed journal '%s'", journal->_filename);
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TRI_RemoveVectorPointer(&collection->base._journals, i);
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TRI_PushBackVectorPointer(&collection->base._datafiles, journal);
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief selects a journal
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////////////////////////////////////////////////////////////////////////////////
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static TRI_datafile_t* SelectJournal (TRI_shape_collection_t* collection,
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TRI_voc_size_t size,
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TRI_df_marker_t** result) {
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TRI_datafile_t* datafile;
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bool ok;
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int res;
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size_t n;
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// need to create a new journal?
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n = collection->base._journals._length;
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if (n == 0) {
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ok = CreateJournal(collection);
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n = collection->base._journals._length;
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if (! ok || n == 0) {
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return NULL;
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}
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}
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// select first datafile
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datafile = collection->base._journals._buffer[0];
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// try to reserve space
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res = TRI_ReserveElementDatafile(datafile, size, result);
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while (res == TRI_ERROR_ARANGO_DATAFILE_FULL) {
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ok = CloseJournal(collection, datafile);
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if (! ok) {
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return NULL;
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}
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ok = CreateJournal(collection);
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n = collection->base._journals._length;
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if (! ok || n == 0) {
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return NULL;
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}
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datafile = collection->base._journals._buffer[0];
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res = TRI_ReserveElementDatafile(datafile, size, result);
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}
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if (res != TRI_ERROR_NO_ERROR) {
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collection->base._state = TRI_COL_STATE_WRITE_ERROR;
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return NULL;
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}
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// we got enough space
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return datafile;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief writes an element to a given position
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////////////////////////////////////////////////////////////////////////////////
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static int WriteElement (TRI_shape_collection_t* collection,
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TRI_datafile_t* journal,
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TRI_df_marker_t* position,
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TRI_df_marker_t* marker,
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TRI_voc_size_t markerSize,
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void const* body,
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size_t bodySize) {
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int res;
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bool waitForSync;
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if (marker->_type == TRI_DF_MARKER_SHAPE) {
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// this is a shape. we will honor the collection's waitForSync attribute
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// which is determined by the global forceSyncShape flag and the actual collection's
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// waitForSync flag
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waitForSync = collection->base._waitForSync;
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}
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else {
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// this is an attribute. we will not sync the data now, but when the shape information
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// containing the attribute is written (that means we defer the sync until the TRI_DF_MARKER_SHAPE
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// marker is written)
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waitForSync = false;
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}
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res = TRI_WriteElementDatafile(journal, position, marker, markerSize, body, bodySize, waitForSync);
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if (res != TRI_ERROR_NO_ERROR) {
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collection->base._state = TRI_COL_STATE_WRITE_ERROR;
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}
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates a new collection
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////////////////////////////////////////////////////////////////////////////////
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TRI_shape_collection_t* TRI_CreateShapeCollection (TRI_vocbase_t* vocbase,
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char const* path,
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TRI_col_parameter_t* parameter) {
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TRI_col_info_t info;
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TRI_shape_collection_t* shape;
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TRI_collection_t* collection;
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shape = TRI_Allocate(TRI_UNKNOWN_MEM_ZONE, sizeof(TRI_shape_collection_t), false);
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if (shape == NULL) {
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return NULL;
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}
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memset(&info, 0, sizeof(info));
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info._version = TRI_COL_VERSION;
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info._type = TRI_COL_TYPE_SHAPE;
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info._cid = TRI_NewTickVocBase();
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TRI_CopyString(info._name, parameter->_name, sizeof(info._name));
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info._maximalSize = parameter->_maximalSize;
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info._waitForSync = (vocbase->_forceSyncShapes || parameter->_waitForSync);
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collection = TRI_CreateCollection(vocbase, &shape->base, path, &info);
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if (collection == NULL) {
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TRI_Free(TRI_UNKNOWN_MEM_ZONE, shape);
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return NULL;
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}
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TRI_InitMutex(&shape->_lock);
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return shape;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief frees the memory allocated, but does not free the pointer
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///
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/// Note that the collection must be closed first.
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////////////////////////////////////////////////////////////////////////////////
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void TRI_DestroyShapeCollection (TRI_shape_collection_t* collection) {
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assert(collection);
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TRI_DestroyMutex(&collection->_lock);
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TRI_DestroyCollection(&collection->base);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief frees the memory allocated and frees the pointer
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////////////////////////////////////////////////////////////////////////////////
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void TRI_FreeShapeCollection (TRI_shape_collection_t* collection) {
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assert(collection);
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TRI_DestroyShapeCollection(collection);
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TRI_Free(TRI_UNKNOWN_MEM_ZONE, collection);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief writes an element splitted into marker and body to file
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////////////////////////////////////////////////////////////////////////////////
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int TRI_WriteShapeCollection (TRI_shape_collection_t* collection,
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TRI_df_marker_t* marker,
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TRI_voc_size_t markerSize,
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void const* body,
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TRI_voc_size_t bodySize,
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TRI_df_marker_t** result) {
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TRI_datafile_t* journal;
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int res;
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// generate a new tick
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marker->_tick = TRI_NewTickVocBase();
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// generate crc
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TRI_FillCrcMarkerDatafile(marker, markerSize, body, bodySize);
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// lock the collection
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TRI_LockMutex(&collection->_lock);
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if (collection->base._state != TRI_COL_STATE_WRITE) {
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if (collection->base._state == TRI_COL_STATE_READ) {
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TRI_UnlockMutex(&collection->_lock);
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return TRI_ERROR_ARANGO_READ_ONLY;
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}
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TRI_UnlockMutex(&collection->_lock);
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return TRI_ERROR_ARANGO_ILLEGAL_STATE;
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}
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// find and select a journal
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journal = SelectJournal(collection, markerSize + bodySize, result);
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if (journal == NULL) {
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TRI_UnlockMutex(&collection->_lock);
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return TRI_ERROR_ARANGO_NO_JOURNAL;
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}
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// and write marker and shape
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res = WriteElement(collection, journal, *result, marker, markerSize, body, bodySize);
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// release lock on collection
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TRI_UnlockMutex(&collection->_lock);
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief opens an existing collection
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////////////////////////////////////////////////////////////////////////////////
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TRI_shape_collection_t* TRI_OpenShapeCollection (TRI_vocbase_t* vocbase,
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char const* path) {
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TRI_shape_collection_t* shape;
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TRI_collection_t* collection;
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shape = TRI_Allocate(TRI_UNKNOWN_MEM_ZONE, sizeof(TRI_shape_collection_t), false);
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if (shape == NULL) {
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return NULL;
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}
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collection = TRI_OpenCollection(vocbase, &shape->base, path);
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if (collection == NULL) {
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TRI_Free(TRI_UNKNOWN_MEM_ZONE, shape);
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return NULL;
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}
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TRI_InitMutex(&shape->_lock);
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return shape;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief closes a collection
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_CloseShapeCollection (TRI_shape_collection_t* collection) {
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return TRI_CloseCollection(&collection->base);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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