mirror of https://gitee.com/bigwinds/arangodb
367 lines
11 KiB
C
367 lines
11 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief Ahuacatl, 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 2010-2012 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 Jan Steemann
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/// @author Copyright 2012, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "Ahuacatl/ahuacatl-collections.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 Ahuacatl
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief comparator function to sort collections by name
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////////////////////////////////////////////////////////////////////////////////
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static int CollectionNameComparator (const void* l, const void* r) {
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TRI_aql_collection_t* left = *((TRI_aql_collection_t**) l);
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TRI_aql_collection_t* right = *((TRI_aql_collection_t**) r);
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return strcmp(left->_name, right->_name);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a collection container
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////////////////////////////////////////////////////////////////////////////////
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static TRI_aql_collection_t* CreateCollectionContainer (const char* const name) {
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TRI_aql_collection_t* collection;
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assert(name);
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collection = (TRI_aql_collection_t*) TRI_Allocate(TRI_UNKNOWN_MEM_ZONE, sizeof(TRI_aql_collection_t), false);
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if (!collection) {
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return NULL;
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}
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collection->_name = (char*) name;
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collection->_collection = NULL;
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collection->_barrier = NULL;
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collection->_readLocked = false;
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return collection;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set up the collection names vector and order it
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////////////////////////////////////////////////////////////////////////////////
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bool SetupCollections (TRI_aql_context_t* const context) {
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size_t i;
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size_t n;
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bool result = true;
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// each collection used is contained once in the assoc. array
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// so we do not have to care about duplicate names here
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n = context->_collectionNames._nrAlloc;
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for (i = 0; i < n; ++i) {
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char* name = context->_collectionNames._table[i];
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TRI_aql_collection_t* collection;
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if (!name) {
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continue;
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}
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collection = CreateCollectionContainer(name);
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if (!collection) {
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result = false;
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TRI_SetErrorContextAql(context, TRI_ERROR_OUT_OF_MEMORY, NULL);
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break;
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}
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TRI_PushBackVectorPointer(&context->_collections, (void*) collection);
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}
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if (result && n > 0) {
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qsort(context->_collections._buffer,
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context->_collections._length,
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sizeof(void*),
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&CollectionNameComparator);
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}
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// now collections contains the sorted list of collections
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief open all collections used
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////////////////////////////////////////////////////////////////////////////////
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bool OpenCollections (TRI_aql_context_t* const context) {
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size_t i;
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size_t n;
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n = context->_collections._length;
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for (i = 0; i < n; ++i) {
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TRI_aql_collection_t* collection = context->_collections._buffer[i];
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char* name;
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assert(collection);
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assert(collection->_name);
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assert(!collection->_collection);
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assert(!collection->_barrier);
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assert(!collection->_readLocked);
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LOG_TRACE("locking collection '%s'", collection->_name);
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name = collection->_name;
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collection->_collection = TRI_UseCollectionByNameVocBase(context->_vocbase, name);
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if (!collection->_collection) {
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TRI_SetErrorContextAql(context, TRI_ERROR_QUERY_COLLECTION_NOT_FOUND, name);
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return false;
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}
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}
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return true;
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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 Ahuacatl
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief unlock all collections used
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////////////////////////////////////////////////////////////////////////////////
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void TRI_UnlockCollectionsAql (TRI_aql_context_t* const context) {
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size_t i;
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// unlock in reverse order
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i = context->_collections._length;
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while (i--) {
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TRI_aql_collection_t* collection = context->_collections._buffer[i];
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assert(collection);
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assert(collection->_name);
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if (!collection->_collection) {
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// collection not yet opened
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continue;
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}
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LOG_TRACE("unlocking collection '%s'", collection->_name);
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TRI_ReleaseCollectionVocBase(context->_vocbase, collection->_collection);
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collection->_collection = NULL;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief lock all collections used
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_LockCollectionsAql (TRI_aql_context_t* const context) {
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if (!SetupCollections(context)) {
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return false;
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}
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if (!OpenCollections(context)) {
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TRI_UnlockCollectionsAql(context);
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return false;
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief read-locks all collections used in a query
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_ReadLockCollectionsAql (TRI_aql_context_t* const context) {
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size_t i;
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size_t n;
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bool result = true;
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// lock in forward order
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n = context->_collections._length;
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for (i = 0; i < n; ++i) {
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int lockResult;
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TRI_aql_collection_t* collection = (TRI_aql_collection_t*) context->_collections._buffer[i];
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TRI_doc_collection_t* documentCollection;
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assert(collection);
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assert(collection->_name);
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assert(collection->_collection);
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assert(collection->_collection->_collection);
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assert(!collection->_readLocked);
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assert(!collection->_barrier);
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documentCollection = (TRI_doc_collection_t*) collection->_collection->_collection;
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LOG_TRACE("read-locking collection '%s'", collection->_name);
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lockResult = documentCollection->beginRead(documentCollection);
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if (lockResult != TRI_ERROR_NO_ERROR) {
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// couldn't acquire the read lock
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result = false;
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TRI_SetErrorContextAql(context, TRI_ERROR_QUERY_COLLECTION_LOCK_FAILED, collection->_name);
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break;
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}
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else {
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collection->_readLocked = true;
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}
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}
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief read-unlocks all collections used in a query
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////////////////////////////////////////////////////////////////////////////////
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void TRI_ReadUnlockCollectionsAql (TRI_aql_context_t* const context) {
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size_t i;
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// unlock in reverse order
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i = context->_collections._length;
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while (i--) {
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TRI_aql_collection_t* collection = (TRI_aql_collection_t*) context->_collections._buffer[i];
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TRI_doc_collection_t* documentCollection;
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assert(collection);
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assert(collection->_name);
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if (!collection->_collection) {
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// don't unlock collections we weren't able to lock at all
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continue;
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}
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if (!collection->_readLocked) {
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// don't unlock non-read-locked collections
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continue;
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}
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assert(collection->_collection->_collection);
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assert(!collection->_barrier);
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documentCollection = (TRI_doc_collection_t*) collection->_collection->_collection;
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LOG_TRACE("read-unlocking collection '%s'", collection->_name);
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documentCollection->endRead(documentCollection);
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collection->_readLocked = false;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds a gc marker for all collections used in a query
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_AddBarrierCollectionsAql (TRI_aql_context_t* const context) {
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size_t i;
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size_t n;
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bool result = true;
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// iterate in forward order
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n = context->_collections._length;
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for (i = 0; i < n; ++i) {
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TRI_barrier_t* ce;
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TRI_aql_collection_t* collection = (TRI_aql_collection_t*) context->_collections._buffer[i];
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TRI_doc_collection_t* documentCollection;
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assert(collection);
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assert(collection->_name);
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assert(collection->_collection);
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assert(collection->_readLocked);
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assert(collection->_collection->_collection);
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assert(!collection->_barrier);
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documentCollection = (TRI_doc_collection_t*) collection->_collection->_collection;
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LOG_TRACE("adding barrier for collection '%s'", collection->_name);
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ce = TRI_CreateBarrierElement(&documentCollection->_barrierList);
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if (!ce) {
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// couldn't create the barrier
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result = false;
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TRI_SetErrorContextAql(context, TRI_ERROR_OUT_OF_MEMORY, NULL);
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break;
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}
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else {
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collection->_barrier = ce;
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}
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}
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief removes the gc markers for all collections used in a query
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////////////////////////////////////////////////////////////////////////////////
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void TRI_RemoveBarrierCollectionsAql (TRI_aql_context_t* const context) {
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size_t i;
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// iterate in reverse order
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i = context->_collections._length;
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while (i--) {
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TRI_aql_collection_t* collection = (TRI_aql_collection_t*) context->_collections._buffer[i];
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assert(collection);
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assert(collection->_name);
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if (!collection->_collection || !collection->_readLocked || !collection->_barrier) {
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// don't process collections we weren't able to lock at all
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continue;
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}
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assert(collection->_readLocked);
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assert(collection->_barrier);
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assert(collection->_collection->_collection);
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LOG_TRACE("removing barrier for collection '%s'", collection->_name);
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TRI_FreeBarrier(collection->_barrier);
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collection->_barrier = NULL;
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}
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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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