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gStore/docs/STRUCT.md

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**This chapter introduce the whole structure of the gStore system project.**
#### Figures
The whole architecture of gStore system is presented in [Architecture](png/system_architecture_en.png).
The thread model of 'ghttp' can be viewed in [EN](png/ghttp_thread_model_en.png) and [ZH](png/ghttp_thread_model_zh.png), which shows the relationship among main process, sever thread, query thread and so on.
The flow of answering a SPARQL query is given in [SPARQL Processing](png/sparql_processing.png), and the subprocess, which only targets at the BGP(Basic Graph Pattern) processing, is drawed in [BGP Processing](png/BGP.png).
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#### The core source codes are listed below:
- Database/ (calling other core parts to deal with requests from interface part)
- Database.cpp (achieve functions)
- Database.h (class, members and functions definitions)
- Join.cpp (join the node candidates to get results)
- Join.h (class, members and functions definitions)
- Strategy.cpp
- Strategy.h
- KVstore/ (a key-value store to swap between memory and disk)
- KVstore.cpp (interact with upper layers)
- KVstore.h
- ISArray/
- ISArray.cpp
- ISArray.h
- ISBlockManager.cpp
- ISBlockManager.h
- ISEntry.cpp
- ISEntry.h
- ISTree/
- ISTree.cpp
- ISTree.h
- heap/ (a heap of nodes whose content are in memory)
- ISHeap.cpp
- ISHeap.h
- node/ (all kinds of nodes in B+-tree)
- ISIntlNode.cpp
- ISIntlNode.h
- ISLeafNode.cpp
- ISLeafNode.h
- ISNode.cpp
- ISNode.h
- storage/
- ISStorage.cpp
- ISStorage.h
- IVArray/
- IVArray.cpp
- IVArray.h
- IVBlockManager.cpp
- IVBlockManager.h
- IVCacheManager.cpp
- IVCacheManger.h
- IVEntry.cpp
- IVEntry.h
- IVTree/
- IVTree.cpp
- IVTree.h
- heap/ (a heap of nodes whose content are in memory)
- IVHeap.cpp
- IVHeap.h
- node/ (all kinds of nodes in B+-tree)
- IVIntlNode.cpp
- IVIntlNode.h
- IVLeafNode.cpp
- IVLeafNode.h
- IVNode.cpp
- IVNode.h
- storage/
- IVStorage.cpp
- IVStorage.h
- SITree/
- SITree.cpp
- SITree.h
- heap/ (a heap of nodes whose content are in memory)
- SIHeap.cpp
- SIHeap.h
- node/ (all kinds of nodes in B+-tree)
- SIIntlNode.cpp
- SIIntlNode.h
- SILeafNode.cpp
- SILeafNode.h
- SINode.cpp
- SINode.h
- storage/
- SIStorage.cpp
- SIStorage.h
- Query/ (needed to answer SPARQL query)
- BasicQuery.cpp (basic type of queries without aggregate operations)
- BasicQuery.h
- IDList.cpp (candidate list of a node/variable in query)
- IDList.h
- ResultFilter.cpp
- ResultFilter.h
- ResultSet.cpp (keep the result set corresponding to a query)
- ResultSet.h
- SPARQLquery.cpp (deal with a entire SPARQL query)
- SPARQLquery.h
- Varset.cpp
- Varset.h
- QueryCache.cpp
- QueryCache.h
- QueryTree.cpp
- QueryTree.h
- GeneralEvaluation.cpp
- GeneralEvaluation.h
- TempResult.cpp
- TempResult.h
- RegexExpression.h
- Signature/ (assign signatures for nodes and edges, but not for literals)
- SigEntry.cpp
- SigEntry.h
- Signature.cpp
- Signature.h
- VSTree/ (an tree index to prune more efficiently)
- EntryBuffer.cpp
- EntryBuffer.h
- LRUCache.cpp
- LRUCache.h
- VNode.cpp
- VNode.h
- VSTree.cpp
- VSTree.h
- - -
#### The parser part is listed below:
- Parser/
- DBParser.cpp
- DBParser.h
- RDFParser.cpp
- RDFParser.h
- SparqlParser.c (auto-generated, subtle modified manually, compressed)
- SparqlParser.h (auto-generated, subtle modified manually, compressed)
- SparqlLexer.c (auto-generated, subtle modified manually, compressed)
- SparqlLexer.h (auto-generated, subtle modified manually, compressed)
- TurtleParser.cpp
- TurtleParser.h
- Type.h
- QueryParser.cpp
- QueryParser.h
- - -
#### The utilities are listed below:
- Util/
- Util.cpp (headers, macros, typedefs, functions...)
- Util.h
- Bstr.cpp (represent strings of arbitrary length)
- Bstr.h (class, members and functions definitions)
- Stream.cpp (store and use temp results, which may be very large)
- Stream.h
- Triple.cpp (deal with triples, a triple can be divided as subject(entity), predicate(entity), object(entity or literal))
- Triple.h
- BloomFilter.cpp
- BloomFilter.h
- ClassForVlistCache.h
- VList.cpp
- VList.h
- - -
#### The interface part is listed below:
- Server/ (client and server mode to use gStore)
- Client.cpp
- Client.h
- Operation.cpp
- Operation.h
- Server.cpp
- Server.h
- Socket.cpp
- Socket.h
- client_http.hpp
- server_http.hpp
- web/
-
- - -
#### More details
To acquire a deep understanding of gStore codes, please go to [Code Detail](pdf/code_overview.pdf). See [use case](pdf/Gstore2.0_useCaseDoc.pdf) to understand the design of use cases, and see [OOA](pdf/OOA_class.pdf) and [OOD](pdf/OOD_class.pdf) for OOA design and OOD design, respectively.
If you want to know the sequence of a running gStore, please view the list below:
- [connect to server](jpg/A01-connectServer.jpg)
- [disconnect server](jpg/A02-disconnectServer.jpg)
- [load database](jpg/A03-loadDatabase.jpg)
- [unload database](jpg/A04-unloadDatabase.jpg)
- [create database](jpg/A05-buildDatabase.jpg)
- [delete database](jpg/A06-deleteDatabase.jpg)
- [connect to database](jpg/A07-connectDatabase.jpg)
- [disconnect database](jpg/A08-disconnectDatabase.jpg)
- [show databases](jpg/A09-showDatabase.jpg)
- [SPARQL query](jpg/A10-querySPARQL.jpg)
- [import RDF dataset](jpg/A11-loadRDF.jpg)
- [insert a triple](jpg/A12-insertRDF.jpg)
- [delete a triple](jpg/A13-deleteRDF.jpg)
- [create account](jpg/B01-createAccount.jpg)
- [delete account](jpg/B02-deleteAccount.jpg)
- [modify account authority](jpg/B03-changeAccount.jpg)
- [compulsively unload database](jpg/B04-removeDatabase.jpg)
- [see account authority](jpg/B05-showAccount.jpg)
It is really not strange to see something different with the original design in the source code. And some designed functions may have not be achieved so far.
- - -
#### Others
The api/ folder in gStore is used to store API program, libs and examples, please go to [API](API.md) for details. And test/ is used to store a series test programs or utilities, such as gtest, full_test and so on. Chapters related with test/ are [How To Use](USAGE.md) and [Test Result](TEST.md). This project need an ANTLR lib to parse the SPARQL query, whose code is placed in tools/(also archived here) and the compiled libantlr.a is placed in lib/ directory.
We place some datasets and queries in data/ directory as examples, and you can try them to see how gStore works. Related instructions are in [How To Use](USAGE.md). The docs/ directory contains all kinds of documents of gStore, including a series of markdown files and two folders, pdf/ and jpg/. Files whose type is pdf are placed in pdf/ folder, while files with jpg type are placed in jpg/ folder.
You are advised to start from the [README](../README.md) in the gStore root directory, and visit other chapters only when needed. At last, you will see all documents from link to link if you are really interested in gStore.
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