Home » Eclipse Projects » Gemini » Gemini + e4 +Injection Dependency
| Gemini + e4 +Injection Dependency [message #797712] |
Mon, 13 February 2012 15:39  |
Eclipse User |
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Hi All,
juno is on the way, and i try to make injection from entityManager with pure gemini, eclipselink and DI. I don't understand how can i define entityManager without @Produces. I am not sure if i understand correctly, i have to make some Producer like
@Produces
public EntityManager create() {
return emf.createEntityManager();
}
and then i can call it like
@Inject EntityManager em;
I have no idea how to implement EntityManagerProducer
Any ideas or examples?
Thanks in advance!
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| Re: Gemini + e4 +Injection Dependency [message #797796 is a reply to message #797778] |
Mon, 13 February 2012 17:30  |
| Eclipse User |
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hmmm sorry, i don't understand myself  the idea is to use DI from juno (without extra libs) for my RCP program with structure like this:
Bundle A : Main App
Bundle B : Useful tools for Persistence (Gemini, Eclipselink persistence, javax.persistence etc.) and some magic Class with methods like lookupEntityManagerFactoryBuilder(String puName), getEntityManagerProperties() - with data from config, not from persistence.xml
Bundle C : Some App Plugin with Data Objects, and DAO, and PersistenceUnit names "PU1"
Bundle D : Some another App Plugin with Data Objects, and DAO, and PersistenceUnit names "PU2"
and i'll use in my UI components something like this:
@Inject pu1Dao;
...
pu1Dao.load(something);
in pu1Dao
class pu1Dao{
@PersistenceContext(unitName="PU1")
private EntityManager entityManager;
load(something){
...
}
}
and the question is, how to implement magic Class in osgi, that create entitymanager from gemini service with special config data and persistenceUnit and can be used for injection?
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| Re: Gemini + e4 +Injection Dependency [message #798403 is a reply to message #797796] |
Tue, 14 February 2012 11:54 |
| Eclipse User |
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@Mike,
i have made little implementation of my idea, and I hope, I am on the right way.
I have EntityManagerProducer
package org.e4.gemini.util;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.persistence.spi.PersistenceUnitTransactionType;
import org.eclipse.persistence.config.PersistenceUnitProperties;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.service.jpa.EntityManagerFactoryBuilder;
public class EntityManagerProducer {
BundleContext context;
/**
* for future use
* Read config from preferences
* @Inject
* @Preference(value = "jdbc_driver")
*/
private String jdbc_driver = "org.gjt.mm.mysql.Driver";
private String jdbc_url = "jdbc:mysql://127.0.0.1/test";
private String jdbc_user = "test";
private String jdbc_password = "test";
private boolean ddl_drop_and_create_tables = true;
private boolean ddl_create_tables = false;
private int min_conn = 20;
private String logging = "FINEST";
@PersistenceUnit
private EntityManagerFactory emf;
private EntityManager em;
@PostConstruct
public void init() {
System.out.println("createEMF()");
Bundle bundle = FrameworkUtil.getBundle(getClass());
context = bundle.getBundleContext();
if(emf == null){
initEntityManager();
}
em = emf.createEntityManager();
System.err.println("EntityManager: " + em);
}
@PreDestroy
public void destroy(){
if(em != null){
try {
em.close();
}finally{
em = null;
}
}
if (emf != null){
try {
emf.close();
}finally{
emf = null;
em = null;
}
}
}
private void initEntityManager() {
EntityManagerFactoryBuilder emfb = lookupEntityManagerFactoryBuilder("puTest");
if(emfb == null){
System.err.println("EntityManagerFactoryBuilder is null...");
return;
}
emf = emfb.createEntityManagerFactory(getEntityManagerProperties());
System.err.println("entityManagerFactory is " + emf);
}
protected Map<String, Object> getEntityManagerProperties(){
Map<String, Object> properties = new HashMap<String, Object>();
properties.put(PersistenceUnitProperties.TRANSACTION_TYPE, PersistenceUnitTransactionType.RESOURCE_LOCAL.name());
properties.put(PersistenceUnitProperties.JDBC_DRIVER, jdbc_driver );
properties.put(PersistenceUnitProperties.JDBC_URL, jdbc_url);
properties.put(PersistenceUnitProperties.JDBC_USER, jdbc_user);
properties.put(PersistenceUnitProperties.JDBC_PASSWORD, jdbc_password);
if(ddl_drop_and_create_tables) {
properties.put(PersistenceUnitProperties.DDL_GENERATION, "drop-and-create-tables");
}
if(ddl_create_tables) {
properties.put(PersistenceUnitProperties.DDL_GENERATION, "create-tables");
}
properties.put(PersistenceUnitProperties.DDL_GENERATION_MODE, "database");
properties.put(PersistenceUnitProperties.CONNECTION_POOL_MIN, min_conn);
properties.put(PersistenceUnitProperties.TEMPORAL_MUTABLE, "true");
// Logging
properties.put(PersistenceUnitProperties.LOGGING_LEVEL, logging);
properties.put(PersistenceUnitProperties.LOGGING_TIMESTAMP, "true");
properties.put(PersistenceUnitProperties.LOGGING_SESSION, "true");
properties.put(PersistenceUnitProperties.LOGGING_THREAD, "true");
properties.put(PersistenceUnitProperties.LOGGING_EXCEPTIONS, "true");
properties.put(PersistenceUnitProperties.WEAVING, "false");
properties.put(PersistenceUnitProperties.WEAVING_INTERNAL, "false");
// properties.put("eclipselink.weaving", "dynamic");
System.out.println(properties.toString());
return properties;
}
public EntityManagerFactoryBuilder lookupEntityManagerFactoryBuilder(String puName) {
String filter = "(osgi.unit.name="+puName+")";
System.out.println(filter);
ServiceReference<?>[] refs = null;
try {
refs = context.getServiceReferences(EntityManagerFactoryBuilder.class.getName(), filter);
} catch (InvalidSyntaxException isEx) {
new RuntimeException("Bad filter", isEx);
}
System.out.println("EMF Builder Service refs looked up from registry: " + refs);
return (refs == null) ? null : (EntityManagerFactoryBuilder) context.getService(refs[0]);
}
public EntityManagerFactory lookupEntityManagerFactory(String puName) {
String filter = "(osgi.unit.name=" + puName + ")";
ServiceReference<?>[] refs = null;
try {
refs = context.getServiceReferences(EntityManagerFactory.class.getName(), filter);
} catch (InvalidSyntaxException isEx) {
new RuntimeException("Bad filter", isEx);
}
return (refs == null) ? null : (EntityManagerFactory) context.getService(refs[0]);
}
}
and I try to get EntityManager in my RCP App
public class OpenHandler {
@Inject
private EntityManagerProducer emp;
@PersistenceContext
private EntityManager entityManager;
@PersistenceContext(unitName="puTest")
private EntityManager entityManager2;
@Execute
public void execute(
IEclipseContext context,
@Named(IServiceConstants.ACTIVE_SHELL) Shell shell)
throws InvocationTargetException, InterruptedException {
// FileDialog dialog = new FileDialog(shell);
// dialog.open();
System.out.println("emp:" + emp);
System.out.println("entityManager:" + entityManager);
System.out.println("entityManager2:" + entityManager2);
}
}
but both entityManager and entityManager2 are null.
What do I wrong ?
If you have time, and want to see complete source code, you can download it from my dropbox http://db.tt/PlcsXi3y
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| Re: Gemini + e4 +Injection Dependency [message #800235 is a reply to message #799371] |
Thu, 16 February 2012 16:10 |
| Eclipse User |
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Mike, I am done. Download it from my dropbox - http://db.tt/MZSCnL1f
What I did:
plugin org.eclipse.gemini.ext.di with 2 DS geminiEMF & geminiEM. They have annotation @Component(immediate=true, servicefactory=true), thank them (I hope) bundle starts automatically with core start level. Services implements service tracker for EntityManagerFactory(gemini) (see org.eclipse.gemini.ext.di.impl.GeminiEMFSupplier.java#init()), and I think, we don't need to worry anymore about start level from plugins with persistence.xml.
yet we can invite EntityManagerFactory and EntityManager with annotations from any bundle.
@Inject
@GeminiPersistenceUnit(unitName="puTest")
EntityManagerFactory emf;
@Inject
@GeminiPersistenceContext(unitName="puTest")
EntityManager em;
unitName is required. An other feature is we can put properties for EMF/EM in annotation
@Inject
@GeminiPersistenceUnit(unitName="puTest", properties = { @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER, value="org.gjt.mm.mysql.Driver"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL, value="jdbc:mysql://127.0.0.1/test"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER, value="test"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD, value="test"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.DDL_GENERATION, value=PersistenceUnitProperties.DROP_AND_CREATE),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.DDL_GENERATION_MODE, value=PersistenceUnitProperties.DDL_DATABASE_GENERATION),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.CONNECTION_POOL_MIN, value="20"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.TEMPORAL_MUTABLE, value="true"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.WEAVING, value="false"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.WEAVING_INTERNAL, value="false"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_LEVEL, value="FINEST"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_TIMESTAMP, value="true"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_SESSION, value="true"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_THREAD, value="true"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_EXCEPTIONS, value="true")
})
EntityManagerFactory emf;
but the best one is we can use properties from Eclipse Preferences
@Inject
@GeminiPersistenceUnit(unitName="puTest2", properties = {
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER, valuePref=@Preference(value="jdbc_driver")),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL, valuePref=@Preference(value="jdbc_url")),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER, valuePref=@Preference(value="jdbc_user")),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD, valuePref=@Preference(value="jdbc_password"))
})
EntityManagerFactory emf1;
or we can mix it
@Inject
@GeminiPersistenceUnit(unitName="puTest", properties = {
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER, value="org.gjt.mm.mysql.Driver"),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL, valuePref=@Preference(value="jdbc_url")),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER, valuePref=@Preference(value="jdbc_user")),
@GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD, valuePref=@Preference(value="jdbc_password"))
})
EntityManagerFactory emf;
working with dao is simple -
public class DataObjectDAO {
@Inject
@GeminiPersistenceContext(unitName="puTest")
private EntityManager entityManager;
public void saveDataObject(DataObject dataObj){
EntityTransaction trx = entityManager.getTransaction();
trx.begin();
entityManager.persist(dataObj);
trx.commit();
}
@PreDestroy
public void destroy(){
entityManager.close();
}
}
and then we use it somewhere
class ... {
@Inject
DataObjectDAO dao;
public void someMethod(){
DataObject dataObj = new DataObject();
dataObj.setDummy("bla bla");
dao.saveDataObject(dataObj);
}
}
that's all!
Look in sources:
org.eclipse.gemini.ext.di Annotations, DS
org.e4.gemini.rcp for implementation -
org.e4.gemini.rcp.handlers.OpenHandler.java
org.e4.gemini.rcp.handlers.SavePreferencesHandler.java
org.e4.gemini.rcp.dao.DataObjectDAO
all other plugins are only for test
it can be really nice extension for gemini!
P.S. I have test it in eclipse 4.2 IB M20120209-0900 (http://download.eclipse.org/eclipse/downloads/drops4/M20120209-0900/index.php)
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| Re: Gemini + e4 +Injection Dependency [message #800248 is a reply to message #800235] |
Thu, 16 February 2012 16:27 |
| Eclipse User |
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Very cool!
Tom
Am 16.02.12 22:10, schrieb Filipp A.:
> Mike, I am done. Download it from my dropbox - http://db.tt/MZSCnL1f
> What I did:
> plugin org.eclipse.gemini.ext.di with 2 DS geminiEMF & geminiEM. They
> have annotation @Component(immediate=true, servicefactory=true), thank
> them (I hope) bundle starts automatically with core start level.
> Services implements service tracker for EntityManagerFactory(gemini)
> (see org.eclipse.gemini.ext.di.impl.GeminiEMFSupplier.java#init()), and
> I think, we don't need to worry anymore about start level from plugins
> with persistence.xml.
>
> yet we can invite EntityManagerFactory and EntityManager with
> annotations from any bundle.
>
> @Inject
> @GeminiPersistenceUnit(unitName="puTest")
> EntityManagerFactory emf;
>
> @Inject
> @GeminiPersistenceContext(unitName="puTest")
> EntityManager em;
>
> unitName is required. An other feature is we can put properties for
> EMF/EM in annotation
>
> @Inject
> @GeminiPersistenceUnit(unitName="puTest", properties = {
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER,
> value="org.gjt.mm.mysql.Driver"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL,
> value="jdbc:mysql://127.0.0.1/test"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER,
> value="test"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD,
> value="test"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.DDL_GENERATION,
> value=PersistenceUnitProperties.DROP_AND_CREATE),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.DDL_GENERATION_MODE,
> value=PersistenceUnitProperties.DDL_DATABASE_GENERATION),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.CONNECTION_POOL_MIN,
> value="20"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.TEMPORAL_MUTABLE,
> value="true"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.WEAVING,
> value="false"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.WEAVING_INTERNAL,
> value="false"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_LEVEL,
> value="FINEST"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_TIMESTAMP,
> value="true"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_SESSION,
> value="true"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_THREAD,
> value="true"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.LOGGING_EXCEPTIONS,
> value="true")
> })
> EntityManagerFactory emf;
>
> but the best one is we can use properties from Eclipse Preferences
>
> @Inject
> @GeminiPersistenceUnit(unitName="puTest2", properties = {
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER,
> valuePref=@Preference(value="jdbc_driver")),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL,
> valuePref=@Preference(value="jdbc_url")),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER,
> valuePref=@Preference(value="jdbc_user")),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD,
> valuePref=@Preference(value="jdbc_password"))
> })
> EntityManagerFactory emf1;
>
> or we can mix it
>
> @Inject
> @GeminiPersistenceUnit(unitName="puTest", properties = {
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER,
> value="org.gjt.mm.mysql.Driver"),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_URL,
> valuePref=@Preference(value="jdbc_url")),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_USER,
> valuePref=@Preference(value="jdbc_user")),
> @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_PASSWORD,
> valuePref=@Preference(value="jdbc_password"))
> })
> EntityManagerFactory emf;
>
>
> working with dao is simple -
>
> public class DataObjectDAO {
> @Inject
> @GeminiPersistenceContext(unitName="puTest")
> private EntityManager entityManager;
>
> public void saveDataObject(DataObject dataObj){
> EntityTransaction trx = entityManager.getTransaction();
> trx.begin();
> entityManager.persist(dataObj);
> trx.commit();
> }
>
> @PreDestroy
> public void destroy(){
> entityManager.close();
> }
> }
>
> and then we use it somewhere
>
> class ... {
>
> @Inject
> DataObjectDAO dao;
>
> public void someMethod(){
> DataObject dataObj = new DataObject();
> dataObj.setDummy("bla bla");
> dao.saveDataObject(dataObj);
> }
> }
>
> that's all!
>
> Look in sources:
> org.eclipse.gemini.ext.di Annotations, DS
>
> org.e4.gemini.rcp for implementation -
> org.e4.gemini.rcp.handlers.OpenHandler.java
> org.e4.gemini.rcp.handlers.SavePreferencesHandler.java
> org.e4.gemini.rcp.dao.DataObjectDAO
>
> all other plugins are only for test
>
> it can be really nice extension for gemini!
>
> P.S. I have test it in eclipse 4.2 IB M20120209-0900
> (http://download.eclipse.org/eclipse/downloads/drops4/M20120209-0900/index.php)
>
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| Re: Gemini + e4 +Injection Dependency [message #803891 is a reply to message #802204] |
Tue, 21 February 2012 19:18 |
| Eclipse User |
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Muki,
at the moment it is only on dropbox, i'm waiting for Mikes feedback.
Sure, you can put in on GitHub, but first it must be updated with license note!
Of course it must be EPL, and you can feel free to use it and make some nice changes. If you want, you can add it, and then you can put it on the GitHub, or wait a little bit, and i make it.
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| Re: Gemini + e4 +Injection Dependency [message #804346 is a reply to message #804269] |
Wed, 22 February 2012 09:14 |
| Eclipse User |
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Filipp A. wrote on Wed, 22 February 2012 07:01 and some step by step instruction:
add to target platform:
org.eclipse.gemini.jpa (Gemini JPA)
osgi.enterprise (from Gemini DB)
(from Eclipselink)
javax.persistence (v2.03 or later)
org.eclipse.persistence.asm
org.eclipse.persistence.antlr
org.eclipse.persistence.core
org.eclipse.persistence.jpa
be sure, that org.eclipse.gemini.jpa has startlevel 3 with auto-start
(see -> org.e4.gemini.rcp.product -> Configuration)
in this test you need to start data und data.two bundles too.
Yeah, I already did these and played with the parameters. However two things really confuse me. Both VM arguments -DGEMINI_DEBUG=true and -DREFRESH_BUNDLES=true don't seem to have any effect?
And there's a infinite loop hidden somewhere. Bundles keep constantly being refreshed. The application
started two times after starting 10 times and bundles constantly keep refreshing.
Quote:
take a look in OpenHandler --> PersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER, valuePref=@Preference(value="jdbc_driver")), at this time you don't have any entry in Eclipse Preferences -> you can change it to something like @GeminiPersistenceProperty(name=PersistenceUnitProperties.JDBC_DRIVER, value="org.gjt.mm.mysql.Driver"), or add in Activator Properties init (see SavePreferencesHandler)
I always delete the runconfiguration folder to really have a clean startup. I added all
necessary informations to the persistence.xml.
More confusion
The infinite loop only appears if I delete the persistence.xml in org.eclipse.gemini.test.data.two. Which seems reasonable as there are two (?) meta information in MANIFEST.MF
Meta-Persistence: META-INF/persistence.xml
JPA-PersistenceUnits: puTest2
(Which one is used for Gemini JPA? Are both needed?)
However. The application starts, when I set auto-start for both persistence.xml bundles to false.
I will add a new branch for the sample application to run with EmbeddedDerby so you can download
Gemini DBAccess and don't have to setup a local MySQL Server for instant testing.
cheers,
Muki
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| Re: Gemini + e4 +Injection Dependency [message #1022355 is a reply to message #804562] |
Thu, 21 March 2013 14:17 |
| Eclipse User |
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Filipp, can you please state in the bug that Muki filed above that you wrote the initial code and that you are willing to contribute it to Gemini JPA?
That will open the door to us legally being able to bring the contribution into the project.
Thanks.
-Mike
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