Neodatis. ODB Article 7 learn ODB log 1

ODB research log

 

Source code analysis started in 2008.5.2

ODB-

Odbadapter-

Localodb, remoteodbclient, samevmodbclient

Istorageengine-

Localstorageengine

Mockstorageengine and serverstorageengie

Storageengineadapter

Clientstorageengine

Samevmclientengine

 

ODB = odbfatory. Open ("Mars. ODB"); open an ODB database for Process Analysis.

 

Session

Localsession

Serversession

Clientsession

Mocksession

 

Metamodel

Sessionmetamodel

 

Filesysteminterface

 

Ibufferedio

Bufferedio

Defaultfileio

Multibufferedio

Multibufferedfileio

 

Iofactory. getinstance

 

Objectreader

Objectwriter

 

Iobjectintrospector

Localobjectintrospector

Clientobejctintrospector

Serverobjectintrospector

 

Objects (inheriting collection)

 

ODB. Store (sport) ODB saves data to the database Process

 

Localstorageengine. internalstore (Sport)

-> Classinfolist classintrospector. internalintrospect (Sport)

-> Classinfolist addclasses-> persistclass-> objectwriter. writeclassinfobody-> writeaction persist

 

Filesysteminterface writelong

-> Multibufferedio. writebytes

Objectwriter. internalstoreobject

-> Insertnonnativeobject

-> Writernonnativeobejctinfo

 

2008.5.10

Objects objects = ODB. getobjects (sport. Class) Query Process

 

2008.5.15

Summarize the Save Process

 

2008.5.17

Summarize the Query Process

 

2008.5.18

Genericqueryexecutor query condition Processor

 

8.5.20 began to think about how to implement an ODB-like object-oriented database engine.

 

2008.5.24 project name ojadb was born and logo was published

 

ODB files were analyzed to analyze each stored byte

 

8.6.4 after several days of attempts, I rejected the zip solution because of poor performance.

 

The first draft of the ojadb storage solution is available in 2008.6.5.

 

The storage solution of ojadb is encoded and tested.

The second draft of the ojadb storage solution was published in 2008.7.19. It is verified by programming storage and reading.

 

Second Analysis of ODB Query

IQUERY query = new criteriaquery (player. class, where. Equal ("name", "Henry ");

 

Objectreader. getobjectst

-> Iqueryexecuor --criteriaqueryexecutor.exe cute: executefullscan when no index is available

 

Matches query conditions and uses OID for identification

Matchobjectwithoid

 

-> B = criteriaquerymanger. Match (Q, MAP)-> q. Map-> using vriterion. Match (MAP) ---- map. getattributevalue (field name in the query condition)

If (B) objectreader. readnonnativeobjectinfofromoid