Unit of Work and cache times

Hello!
I've got a question concerning read queries on a Unit of Work.
In my specific case I'm executing a ReadAllQuery on the Unit of Work getting about 7000 objects. The Performance Profiler is recording a cache time of about 900 milliseconds. If I execute this query on the Session the Profiler records a cache time of about 300 milliseconds.
Now I'd like to know what is happening within the Unit of Work? Why does it takes longer to maintain the objects in the cache? I know that the Unit of Work spends more time overall because of the registering of the objects.
Thanks

The UnitOfWork is a transaction abstraction beyond the shared cache. When you read through a UnitOfWork you still perform the same operations on the shared cache and then pull the working copies into the UnitOfWork's transactional cache. This means that your 300 ms case is really just a sub-set of what is happening in your 900 ms case.
The recommended approach is to read in the objects that you plan to use read-only through the session and then register those you may modify with a UnitOfWork. This allows you to control and optimize the transactional nature of TopLink. Reading everything through a UnitOfWork may be less complex but that complexity comes with a performance cost.
You may want to read through our UnitOfWork primer. It explains this much better then I can here.
http://www.oracle.com/technology/products/ias/toplink/technical/unitOfWorkWP.pdf
Doug

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if ( isTxActive() ) {
objectResults = uow.readAllObjects(Class.forName(objectType), expression);
objectResults = uow.registerAllObjects(objectResults);
} else
objectResults = session.readAllObjects(Class.forName(objectType), expression);
I use the following setup:
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- JDK 1.5
- Oracle JDBC Thin Driver version - 10.1.0.2.0
I have tried the following:
- Specified my OraclePlatform i.e. Oracle9Platform
- Tried playing around with the SQL String binding
- Double checked my type conversions
Below is my logfile output and also my login parameters and extract of one of my descriptors.
Any help would be appreciated.
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Thanks in advance,
Paula
2006-05-24 11:32:05,870 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,871 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,871 (toplink) DEBUG - DatabaseAccessor(connected)--INSERT INTO chebi.AUTOGEN_STRUCTURES (ID, STRUCTURE_ID) VALUES (12599, 19211)
2006-05-24 11:32:05,874 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,875 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,875 (toplink) DEBUG - DatabaseAccessor(connected)--INSERT INTO chebi.DEFAULT_STRUCTURES (ID, STRUCTURE_ID) VALUES (6968, 19213)
2006-05-24 11:32:05,885 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,886 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,886 (toplink) DEBUG - DatabaseAccessor(connected)--INSERT INTO chebi.IMAGE_PRECOMPUTES (ID, FORMAT, IMAGE, STRUCTURE_ID) VALUES (7208, 'p
ng', empty_blob(), 19213)
2006-05-24 11:32:05,898 (toplink) DEBUG - DatabaseAccessor(connected)--SELECT IMAGE FROM chebi.IMAGE_PRECOMPUTES WHERE (ID = 7208) FOR UPDATE
2006-05-24 11:32:05,905 (toplink) DEBUG - write_BLOB
2006-05-24 11:32:05,905 (toplink) DEBUG - DatabaseAccessor(connected)--commit_transaction
2006-05-24 11:32:05,915 (toplink) DEBUG - end_unit_of_work_commit
2006-05-24 11:32:05,915 (toplink) DEBUG - release_unit_of_work
2006-05-24 11:32:05,915 (controller.DatabaseAction) DEBUG - ModifyStructureAction_postprocess: empty method
2006-05-24 11:32:05,915 (controller.DatabaseAction) DEBUG - ModifyStructureAction_findSuccess: start method
2006-05-24 11:32:05,915 (controller.DatabaseAction) DEBUG - ModifyStructureAction_findSuccess: preparing forward ( set form | release lock | reset token )
2006-05-24 11:32:05,915 (controller.DatabaseAction) DEBUG - ModifyStructureAction_findSuccess: forward to searchId
2006-05-24 11:32:05,917 (toplink.ToplinkDAO) DEBUG - find(String objectType, String col, String val): start method
2006-05-24 11:32:05,917 (toplink.ToplinkDAO) DEBUG - isTxActive: start method
2006-05-24 11:32:05,917 (toplink.ToplinkDAO) DEBUG - isTxActive: false
2006-05-24 11:32:05,917 (toplink) DEBUG - execute_query
2006-05-24 11:32:05,917 (toplink) DEBUG - DatabaseAccessor(connected)--SELECT ID, SOURCE, ASCII_NAME, STATUS, CREATED_ON, DEFINITION, MODIFIED_BY, NAME, MODI
FIED_ON, CREATED_BY, CHEBI_ACCESSION, MERGE_TYPE, PARENT_ID FROM chebi.COMPOUNDS WHERE (ID LIKE 6126)
2006-05-24 11:32:05,980 (toplink) DEBUG - execute_query
2006-05-24 11:32:06,046 (handlers.DefaultExceptionHandler) ERROR - Exception [TOPLINK-6027] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): ora
cle.toplink.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(uk.ac.ebi.chebi.compounds.model.CompoundName)
uk.ac.ebi.chebi.compounds.application.curator2.exceptions.BeanUtilException: Exception [TOPLINK-6027] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060
118)): oracle.toplink.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(uk.ac.ebi.chebi.compounds.model.CompoundName)
LOGIN:
public void applyLogin () {
DatabaseLogin login = new DatabaseLogin();
login.usePlatform( ToplinkDeploymentHelper.getPlatform(options) );
login.setDriverClassName(options.getDriver());
login.setConnectionString(options.getDbUrl());
login.setUserName(options.getDbUserName());
login.setPassword(options.getDbPassword());
// Configuration properties.
// login.setUsesNativeSequencing(true);
// login.setSequencePreallocationSize(100);
// Replace with
login.setDefaultSequence(new NativeSequence("", 1));
login.setShouldBindAllParameters(false);
login.setShouldCacheAllStatements(false);
// String binding is used when the SQL string might be too large to
// incorporate in the Oracle Thin driver. It will give an exception of string literal
// too long. Hence string binding should be turned on for long strings such
// as long names
login.setUsesStringBinding(true);
login.useStringBinding( );
// This specifies for large bytes to use binding to prevent the same problem
// above and improve performance
login.setUsesByteArrayBinding(true);
if ( login.shouldUseByteArrayBinding() ) { // Can only be used with binding.
login.setUsesStreamsForBinding(false);
login.setShouldForceFieldNamesToUpperCase(false);
login.setShouldOptimizeDataConversion(true);
login.setShouldTrimStrings(true);
login.setUsesBatchWriting(false);
if ( login.shouldUseBatchWriting() ) { // Can only be used with batch writing.
login.setUsesJDBCBatchWriting(true);
login.setUsesExternalConnectionPooling(false);
login.setUsesExternalTransactionController(false);
setLogin(login);
ImagePrecompute descriptor:
public ClassDescriptor buildImagePrecomputeDescriptor () {
ClassDescriptor descriptor = new ClassDescriptor();
descriptor.setJavaClass(uk.ac.ebi.chebi.compounds.model.ImagePrecompute.class);
descriptor.addTableName( options.getDbSchemaName().concat(".").concat("IMAGE_PRECOMPUTES") );
descriptor.addPrimaryKeyFieldName("IMAGE_PRECOMPUTES.ID");
descriptor.useSoftCacheWeakIdentityMap();
descriptor.setIdentityMapSize(50);
descriptor.useRemoteNoIdentityMap();
//descriptor.useRemoteSoftCacheWeakIdentityMap();
//descriptor.setRemoteIdentityMapSize(100);
descriptor.setSequenceNumberFieldName("IMAGE_PRECOMPUTES.ID");
descriptor.setSequenceNumberName("image_precompute_sequence");
descriptor.setAlias("ImagePrecomputes");
descriptor.getQueryManager().checkCacheForDoesExist();
DirectToFieldMapping idMapping = new DirectToFieldMapping();
idMapping.setAttributeName("id");
idMapping.setFieldName("IMAGE_PRECOMPUTES.ID");
descriptor.addMapping(idMapping);
OneToOneMapping structureMapping = new OneToOneMapping();
structureMapping.setAttributeName("structure");
structureMapping.setReferenceClass(uk.ac.ebi.chebi.compounds.model.Structure.class);
structureMapping.dontUseIndirection();
structureMapping.addForeignKeyFieldName("IMAGE_PRECOMPUTES.STRUCTURE_ID", "STRUCTURES.ID");
descriptor.addMapping(structureMapping);
DirectToFieldMapping imageMapping = new DirectToFieldMapping();
imageMapping.setAttributeName("image");
imageMapping.setFieldName("IMAGE_PRECOMPUTES.IMAGE");
TypeConversionConverter imageMappingConverter = new TypeConversionConverter(imageMapping);
imageMappingConverter.setObjectClass(byte[].class);
imageMappingConverter.setDataClass(java.sql.Blob.class);
imageMapping.setConverter(imageMappingConverter);
descriptor.addMapping(imageMapping);
DirectToFieldMapping formatMapping = new DirectToFieldMapping();
formatMapping.setAttributeName("format");
formatMapping.setFieldName("IMAGE_PRECOMPUTES.FORMAT");
descriptor.addMapping(formatMapping);
return descriptor;
Message was edited by:
pmatos

Hi,
Thanks for replying.
I use log4j to log my toplink info so that I can write it to a file so that is why I have no session info. If you think it is will be useful then I will try to include it in my tool so that it can be reproduced.
In the mean time here is the stacktrace:
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(uk.ac.ebi.chebi.compounds.model.CompoundName)
uk.ac.ebi.chebi.compounds.application.curator2.exceptions.BeanUtilException: Exception [TOPLINK-6027] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(uk.ac.ebi.chebi.compounds.model.CompoundName)
     at uk.ac.ebi.chebi.compounds.application.curator2.controller.helper.BeanAssembler.populateCompoundBean(Unknown Source)
     at uk.ac.ebi.chebi.compounds.application.curator2.controller.search.SearchIdAction.loadCompound(Unknown Source)
     at uk.ac.ebi.chebi.compounds.application.curator2.controller.search.SearchIdAction.executeLogic(Unknown Source)
     at uk.ac.ebi.chebi.compounds.application.curator2.controller.BaseAction.execute(Unknown Source)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
     at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
     at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
     at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261)
     at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:388)
     at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:316)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:644)
     at java.lang.Thread.run(Thread.java:595)
Caused by: Exception [TOPLINK-6027] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.QueryException
Exception Description: Query sent to a unactivated UnitOfWork.
Query: ReadAllQuery(uk.ac.ebi.chebi.compounds.model.CompoundName)
     at oracle.toplink.exceptions.QueryException.querySentToInactiveUnitOfWork(QueryException.java:816)
     at oracle.toplink.publicinterface.UnitOfWork.internalExecuteQuery(UnitOfWork.java:2530)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:981)
     at oracle.toplink.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:62)
     at oracle.toplink.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:55)
     at oracle.toplink.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:61)
     at oracle.toplink.indirection.IndirectList.buildDelegate(IndirectList.java:184)
     at oracle.toplink.indirection.IndirectList.getDelegate(IndirectList.java:307)
     at oracle.toplink.indirection.IndirectList.size(IndirectList.java:632)
     at java.util.ArrayList.<init>(ArrayList.java:133)
     at uk.ac.ebi.chebi.compounds.model.Compound.getAllCompoundNameList(Unknown Source)
     at uk.ac.ebi.chebi.compounds.application.curator2.controller.helper.BeanAssembler.populateAllNames(Unknown Source)
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Getting Unit Of Work without JSP context

We are developing an application using Toplink and ADF Datacontrols. We have timer (which starts right after deploy) which reads data from magnetic card reader and stores them into database (via Toplink). Our main problem is getting Unit Of Work (server session). If user interacts with application via jsp pages, obtaining uow is done from TopLinkDataControl (getAssociatedUnitOfWork()). But timer lives on its own, it has no jsp pages to get context from.
We know one solution - getting server session from toplink descriptor (absolute path needed) - XMLProjectReader.read("c:\\...\\toplink-deployment-descriptor.xml"). Is there another way to create Unit Of Work for our timer in order to last whole application existence? Thanks.

I was wrong, when I thought, that XMLProjectReader.read() with absolute path works. Your solution seems to be similar, with the same result. I'll describe my problem more closely:
- Our web apllication consists of 2 projects - Model and ViewController. Each has set the classpath pointing to classes of the opposite project.
- The only way, that I know of starting a Clock (from Model, Runnable) without creating JSP page is instatiating it in some servlet's init() method. (Servlet has set 'Load This Servlet When the Web App is Strted" in WEB.XML).
- When I try in my clock to create UnitOfWork by XMLProjectReader.read("c:\\...\\toplink-deployment-descriptor.xml"), I get this error:
EXCEPTION [TOPLINK-3007] (OracleAS TopLink - 10g (9.0.4.5) (Build 040930)): oracle.toplink.exceptions.ConversionException
EXCEPTION DESCRIPTION: The Object [mypackage.MyClass], of class[class java.lang.String] could not be converted to [class java.lang.Class]. Please ensure that the class [class java.lang.Class] is on the CLASSPATH. You may need to use alternate
API passing in the appropriate class loader as required, or setting it
on the default ConversionManager/
INTERNAL EXCEPTION: java.lang.ClassNotFoundException: mypackage.MyClass
- mypackage.MyClass is one of many classes from Model, mapped in toplink-deployment-descriptor.xml. It is in classpath of ViewController.
- For the time being, our application runs in JDeveloper, it will be deployed to OracleAS 10g.
Either somebody please help me how to solve above error or maybe suggest how to start my clock together with application deployment (no jsp context).
Thanks.

Unit of Work and cache times

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