Nabble - lingo - user

Re: Is the LINGO project still alive?

2009-05-26T10:07:31Z

James.Strachan wrote:

2009/5/25 szefo <szefo7@o2.pl>:
> Hi,
>
> I have a question concerning the LINGO project. Is it still alive.

Its still alive, though its kinda finished really. Most of the active
development effort has moved to the Apache Camel project
http://camel.apache.org/
which is similar to Lingo but works with different protocols in addition to JMS

> It seems
> that nobody is working on that project. Would you recommend something new to
> implement JMX over JMS?

I know of another OSS project which will be tackling JMX over JMS in a
few weeks time (I'll reply when the site is public) - but apart from
that I'm not aware of another.

Thank you very much for your reply.
I have also not found any other implementation of JSR-160 JMS connector (JMX over JMS) (maybe in exception of: http://j2ee-wg.web.cern.ch/j2ee-wg/SonicMQ50/sonicmq_docs/mgmt_api/com/sonicsw/mf/jmx/client/JMSConnectorClient.html)
I asked this question because I am seeking an actively developed project regarding this topic... but in this case I will still use LINGO.

Regards,
Tom

My IT Blog: http://www.tomek.bujok.info

Re: Is the LINGO project still alive?

2009-05-26T05:53:38Z

2009/5/25 szefo <szefo7@...>:
> Hi,
>
> I have a question concerning the LINGO project. Is it still alive.

Its still alive, though its kinda finished really. Most of the active
development effort has moved to the Apache Camel project

http://camel.apache.org/

which is similar to Lingo but works with different protocols in addition to JMS

> It seems
> that nobody is working on that project. Would you recommend something new to
> implement JMX over JMS?

I know of another OSS project which will be tackling JMX over JMS in a
few weeks time (I'll reply when the site is public) - but apart from
that I'm not aware of another.

--
James
-------
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Open Source Integration
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Is the LINGO project still alive?

2009-05-25T10:43:52Z

Hi,

I have a question concerning the LINGO project. Is it still alive. It seems that nobody is working on that project. Would you recommend something new to implement JMX over JMS?

Regards,
Tom

My IT Blog: http://www.tomek.bujok.info

Exception on deployment

2009-03-31T14:17:23Z

I tried to create a simple remoting application to evaluate Lingo. I have added the lingo jar, the basic spring jars and the activemq jar to the classpath. Any ideas if there's something I'm doing wrong from the Lingo side of things?

Thanks

On deployment of the war to JBoss 5 AS, this is what I see:

15:51:51,815 INFO [DefaultListableBeanFactory] Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1d55b9f: defining beans [client,server,serverImpl,jmsFactory,exampleDestination]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@d01167
15:51:51,908 INFO [DefaultListableBeanFactory] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1d55b9f: defining beans [client,server,serverImpl,jmsFactory,exampleDestination]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@d01167
15:51:51,908 ERROR [DispatcherServlet] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in ServletContext resource [/WEB-INF/mylingo-servlet.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/FutureTask
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1338)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
.
.
.
.
.
.
at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781)
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:698)
at org.jboss.system.server.profileservice.ProfileServiceBootstrap.loadProfile(ProfileServiceBootstrap.java:304)
at org.jboss.system.server.profileservice.ProfileServiceBootstrap.start(ProfileServiceBootstrap.java:205)
at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:405)
at org.jboss.Main.boot(Main.java:209)
at org.jboss.Main$1.run(Main.java:547)

Here are the relevant xml (on the server side), .. the client xml doesn't really do anything:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>SpringWebApp</display-name>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet-mapping>
<servlet-name>simple</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>

<servlet>
<servlet-name>simple</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/simple-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
<welcome-file>/myfile.jsp</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
</web-app>

mylingo-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>


<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>


<bean id="client" class="org.logicblaze.lingo.jms.JmsProxyFactoryBean">
<property name="serviceInterface" value="com.vgb.lingoremoting.service.EchoService"/>
<property name="connectionFactory" ref="jmsFactory"/>
<property name="destination" ref="exampleDestination"/>
</bean>


<bean id="server" class="org.logicblaze.lingo.jms.JmsServiceExporter">
<property name="service" ref="serverImpl"/>
<property name="serviceInterface" value="com.vgb.lingoremoting.service.EchoService"/>
<property name="connectionFactory" ref="jmsFactory"/>
<property name="destination" ref="exampleDestination"/>
</bean>


<bean id="serverImpl" class="com.vgb.lingoremoting.service.EchoServiceImpl" singleton="true"/>


<bean id="jmsFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="vm://localhost"/>
</bean>

<bean id="exampleDestination" class="org.apache.activemq.command.ActiveMQQueue">
<constructor-arg index="0" value="test.org.logicblaze.lingo.example"/>
</bean>
</beans>

Re: Does lingo work with plain jms provider?

2009-01-27T01:39:33Z

2008/12/16 eric54 <yuling.chen@...>:
>
> Hi,
>
> I'm new to Lingo and I tried some samples on spring and it worked great.
>
> We do have one use case that we could not use spring, but will need to use
> JMS. My question is that if lingo work on top of a jms provider, such as
> activemq?

Lingo currently uses Spring; but that doesn't mean you have to use
Spring for Dependency Injection; its just a Java framework library so
its no big deal having it as a dependency.

Incidentally the long term replacement to Lingo is Apache Camel...
http://camel.apache.org/

e.g. here's how to do spring remoting in camel via XML
http://camel.apache.org/spring-remoting.html

or via annotations
http://camel.apache.org/pojo-consuming.html
http://camel.apache.org/pojo-producing.html

both of which use spring too as a JMS facade library as well as - if
you want - a dependency injection framework.

--
James
-------
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Open Source Integration
http://fusesource.com/

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Re: Does lingo work with plain jms provider?

2009-01-26T23:45:55Z

I'm not sure, but check out PUA Lingo.

eric54 wrote:

We do have one use case that we could not use spring, but will need to use JMS. My question is that if lingo work on top of a jms provider, such as activemq?

-- PUA Lingo --

Does lingo work with plain jms provider?

2008-12-16T11:00:00Z

Hi,

I'm new to Lingo and I tried some samples on spring and it worked great.

We do have one use case that we could not use spring, but will need to use JMS. My question is that if lingo work on top of a jms provider, such as activemq?

Thanks,

TimeoutException when using the example of optimizerserver from here

2008-10-29T07:31:10Z

Exception in thread "main" org.springframework.remoting.RemoteAccessException: Cannot access JMS invoker remote service at [null]; nested exception is javax.jms.JMSException: edu.emory.mathcs.backport.java.util.concurrent.TimeoutException
at org.logicblaze.lingo.jms.JmsClientInterceptor.invoke(JmsClientInterceptor.java:151)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy0.solve(Unknown Source)
at client.OptimizerClient.main(OptimizerClient.java:26)
Caused by: javax.jms.JMSException: edu.emory.mathcs.backport.java.util.concurrent.TimeoutException
at org.logicblaze.lingo.jms.impl.MultiplexingRequestor.createJMSException(MultiplexingRequestor.java:205)
at org.logicblaze.lingo.jms.impl.MultiplexingRequestor.request(MultiplexingRequestor.java:133)
at org.logicblaze.lingo.jms.JmsClientInterceptor.invoke(JmsClientInterceptor.java:138)
... 4 more

Getting this error when I am trying to run the Optimizerclient. Can anyone help pls.
When trying to debug it goes into JdkDynamicAopProxy for which I dnt have the code. If someone has already hit through this problem, and could help I would really appreciate.

Thanks,
Sripal.

Question on JIRA LINGO-42

2008-10-24T15:54:50Z

http://jira.codehaus.org/browse/LINGO-42

I was using the jmsExpiration field to extend my JMS timout (I have a process that takes longer then 30 seconds to respond). I just updated to Lingo 1.3 and noticed that the property was removed. Is there a simple way to set the JMS Expiration timeout? I can see it back on the javax.jms.MessageProducer but have no idea how to set get to it so I can set it since I have everything wired in Spring.

Thanks in advance for any help!

- Doug

Re: Question on a use case

2008-09-03T10:29:48Z

2008/9/3 nitingupta183 <nitingupta183@...>:

>
> hi all,
>
> I am new to JMS and other remoting technolgies. I need to integrate my
> application with a GSM modem based gateway application. I am looking for an
> asynchronous transfer between both the applications as both can send each
> other a message to do processing.
> Both the applications are spring framework based. Please let me know which
> technology/framework can best solve my purpose with least learning and
> development efforts.
> My applications shall be hosted on different physical machines.

I'd recommend using Apache Camel which in many ways evolved from Lingo...
http://activemq.apache.org/camel/

it provides the same spring-remoting capability, plus supporting a ton
of other transports
http://activemq.apache.org/camel/components.html

as well as numerous other EIPs
http://activemq.apache.org/camel/enterprise-integration-patterns.html

BTW I've kicked dwijotm from the mailing list so we shouldn't get any
more spam from that email address :

--
James
-------
http://macstrac.blogspot.com/

Open Source Integration
http://open.iona.com

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Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:13:49Z

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Re: Re: Re: Re: Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:13:06Z

Re: Re: Re: Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:12:50Z

Re: Re: Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:12:40Z

Re: Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:12:31Z

Re: Re: Re: Re: Re: Question on a use case

2008-09-03T10:12:20Z

Re: Re: Re: Re: Question on a use case

2008-09-03T10:12:10Z

Re: Re: Re: Question on a use case

2008-09-03T10:12:03Z

Re: Re: Question on a use case

2008-09-03T10:11:37Z

Re: Question on a use case

2008-09-03T10:11:24Z

Question on a use case

2008-09-03T10:10:20Z

hi all,

I am new to JMS and other remoting technolgies. I need to integrate my application with a GSM modem based gateway application. I am looking for an asynchronous transfer between both the applications as both can send each other a message to do processing.
Both the applications are spring framework based. Please let me know which technology/framework can best solve my purpose with least learning and development efforts.
My applications shall be hosted on different physical machines.

Cheers,
Nitin

mixture of pub-sub and request-response

2007-12-11T02:10:31Z

Hello,

I have two servers that currently have a CORBA interface. One is purely
request-response so I am considering replacing the CORBA interface with
lingo. The other one is more involved and I am not sure if lingo is
appropriate. Hopefully this is the right place to get advice. It would be
very appealing if both could be done using lingo. If the second cannot it
will weaken my argument for using lingo for the first server.

Talking about the second server....

The server has a thread that watches out for asynchronous events that
occur via a third-party library. Let us call this the event-listening
thread.
Via CORBA there is a synchronous request that accepts an object reference
from the client and registers it as being interested in events that occur
via the event-listening thread. When an event comes into the
event-listening thread it invokes a method on the registered client-side
object. So although the registration request is request-response, it is a
bit like subscribing to these third-party events. The event-listening
thread publishes to the subscribers.

I see from the Overview lingo page that there is a way to invoke methods
on the client side from the server. So it looks like I probably can use
lingo for what I want to do. But I am not sure, being very new to lingo.
Also, even if it can be done, is it appropriate? Once the registration has
been done the server is supposed to send all third-party events to the
client until further notice (i.e. until a deregister request has been
received). So it is very similar to traditional pub-sub.

Regards,

Andrew Marlow
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Returning a remote object - did not get this working

2007-11-20T01:11:28Z

Hello everybody,

I only want to export my "starter" object in lingo, and this "Starter" object should then in turn return references to my other objects on the server... Sadly, I always get a NotSerializableException from ActiveMQ, as the target object returned by the starter is not serializable.

As far as I understood, you can pass client objects to the server, but this is not possible the other way around, right?

If you need a small example, just tell me, then I will upload it.

Greets,
Sebastian

Pure Synchronous Call not working

2007-11-09T05:24:35Z

I am attempting to implement a pure synchronous call through Lingo. I have the following beans defined in Spring.

<code>
<bean id="jmsFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="vm://localhost"/>
</bean>

<bean id="SyncDestination" class="org.apache.activemq.command.ActiveMQQueue">
<constructor-arg index="0" value="com.ge.nbc.cnbc.gdp.SYNC.feed"/>
</bean>

<bean id="client" class="org.logicblaze.lingo.jms.JmsProxyFactoryBean">
<property name="serviceInterface" value="com.ge.nbc.cnbc.gdp.service.DataProviderService"/>
<property name="connectionFactory" ref="jmsFactory"/>
<property name="destination" ref="SyncDestination"/>
</bean>

<bean id="syncClient" class="com.ge.nbc.cnbc.gdp.jms.TickerPlantDataSynchronizer">
<property name="service" ref="client"/>
</bean>

<bean id="GlobalTickerService" class="com.ge.nbc.cnbc.gdp.service.impl.JMSTickerPlantServiceImpl" destroy-method="close">
<property name="configurationService" ref="configurationService"/>
<property name="configurations">
<set>
<ref bean="NYSEConfiguration"/>
<ref bean="NASDAQConfiguration"/>
<ref bean="ILXConfiguration"/>
</set>
</property>
<property name="serviceName" value="GlobalTickerService"/>
<property name="dataStore" ref="TickCache"/>
<property name="serverInfo" value="localhost"/>
<property name="jmsTemplate" ref="jmsTemplate"/>
<property name="symbologyService" ref="SymbologyService"/>
<property name="dataApiService" ref="dataApi"/>
</bean>

<bean id="TickerPlant2" class="org.logicblaze.lingo.jms.JmsServiceExporter" depends-on="broker" singleton="true">
<property name="service" ref="GlobalTickerService" />
<property name="serviceInterface" value="com.ge.nbc.cnbc.gdp.service.DataProviderService" />
<property name="connectionFactory" ref="jmsFactory" />
<property name="destination" ref="SyncDestination"/>
</bean>
</code>

I then have junit test that obtains the "syncClient" bean and makes a request. I can trace the call into the remote service, but never get the object back. It simply times out with the following error:

<code>
org.springframework.remoting.RemoteAccessException: Cannot access JMS invoker remote service at [null]; nested exception is javax.jms.JMSException: edu.emory.mathcs.backport.java.util.concurrent.TimeoutException
Caused by: javax.jms.JMSException: edu.emory.mathcs.backport.java.util.concurrent.TimeoutException
at org.logicblaze.lingo.jms.impl.MultiplexingRequestor.createJMSException(MultiplexingRequestor.java:205)
at org.logicblaze.lingo.jms.impl.MultiplexingRequestor.request(MultiplexingRequestor.java:133)
at org.logicblaze.lingo.jms.JmsClientInterceptor.invoke(JmsClientInterceptor.java:138)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy1.syncSymbolDataNode(Unknown Source)
</code>

This configuration seems to follow the simple example on the Lingo site, but I just can't seem to make it work. I assume that there is just something misconfigured. Any help would be greatly appreciated.

Thanks,
Pete

low performance with lingo and activemq

2007-10-17T17:04:48Z

I sent a similar message to the ActiveMQ list but got no responses.

I'm using Lingo 1.3 with an embedded Activemq 4.1.1 (using the intra vm transport) one the server and a client on a separate physical machine.

I have these options set on the connection factory:

<bean id="jmsFactory" class="org.apache.activemq.ActiveMQConnectionFactory" >
<property name="brokerURL" value="vm:(broker:(${callback.jms.brokerUrl})?persistent=false&brokerName=callbackBroker&useJmx=true)?marshal=false"/>
<property name="useAsyncSend" value="true"/>
<property name="useSyncSend" value="false"/>
<property name="alwaysSessionAsync" value="true"/>
<property name="objectMessageSerializationDefered" value="true"/>
<property name="optimizeAcknowledge" value="true"/>
<property name="optimizedMessageDispatch" value="true"/>

Messages (non persistent) gets sent intra VM to temp queue A, which the remote client then consumes. A message (persistent) also gets sent from temp queue B back to temp queue A (not entirely sure on why this happens, this is what I see using the JMX console - this is supposed to one way async remote invocation).

The problem appears to be related to getting messages into queue A, I can see the queue enqueue count lagging the the amount of messages being sent. I have a queue in Java in front of it and I can see a backlog starting to build in there. This threshold appears to be around 100 messages / sec, it cannot submit messages any quicker than that.

Looking through the Lingo source one possible cause I see is that the messages that gets sent when a callback is called is sent with MultiplexRequestor.request() which appears to block for a timeout period until a response message is received. request() instead of send() is chosen since the metadata for the method indicates oneWay is false. The method in question is void and throws no exceptions, the metadata.oneway never gets evaluated since the SimpleMetadataStrategy in the JmsProxyFactoryBean(JmsClientInterceptor) was constructed with oneWayForVoidMethods left at the default false. I don't know where this JmsProxyFactoryBean gets constructed, as I've supplied it a custom metadataStrategy and invocationFactory with proper metadataStrategy in the configuration:

<bean id="callbackRegistryServiceListener" class="org.logicblaze.lingo.jms.JmsServiceExporterMessageListener">
<property name="service" ref="callbackService"/>
<property name="serviceInterface" value="CallbackService"/>
<property name="connectionFactory" ref="jmsFactory"/>
<property name="persistentDelivery" value="false"/>
<property name="invocationFactory" ref="invocationFactory"/>
<property name="metadataStrategy" ref="metadataStrategy" />
</bean>

<bean id="callbackService"
class="org.logicblaze.lingo.jms.JmsProxyFactoryBean">
<property name="serviceInterface"
value="CallbackService" />
<property name="connectionFactory" ref="jmsFactory" />
<property name="destination" ref="callbackDestination" />
<property name="marshaller" ref="clientLingoMarshaller" />
<property name="remoteInvocationFactory" ref="invocationFactory"/>
<property name="metadataStrategy" ref="metadataStrategy" />
</bean>

The code in JmsServiceExporterMessageListener looks suspicious, not sure why it creates the factory instead of getting it from Spring:

protected Object createRemoteProxy(Message message, Class parameterType, Object argument) throws JMSException {
JmsProxyFactoryBean factory = new JmsProxyFactoryBean();

it neglects to copy over the metadataStrategy, so I added it:

log.info("Setting metdataStrategy to [" + metadataStrategy + "] which has oneway [" + ((SimpleMetadataStrategy)metadataStrategy).isOneWayForVoidMethods() + "]");
factory.setMetadataStrategy(metadataStrategy);

I could see that callbacks now gets treated as one way messages and the submission is much faster, my backlog queue in Java never grows, in other words messages gets submitted as fast as they come in.

Now I see a problem with the consumers, the dequeue count is lagging the enqueue count and the activemq temp queue size is growing. That's another matter...

So in conclusion, does anyone know if not copying the metadatastrategy when creating the new JmsProxyFactoryBean is an oversight? Is it ok for callback methods to be treated as oneway methods (if they meet the criteria of course) ?

Thanks
Peter

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java.lang.NoSuchMethodError: org.apache.activemq.command.ConnectionInfo.isClientMaster()

2007-10-04T05:45:34Z

Hi,

Can anyone help with the following error:

java.lang.AbstractMethodError: org.apache.activemq.openwire.v2.BrokerInfoMarshaller.tightUnmarshal(Lorg/apache/activemq/openwire/OpenWireFormat;Ljava/lang/Object;Ljava/io/DataInputStream;Lorg/apache/activemq/openwire/BooleanStream;)V
at org.apache.activemq.openwire.OpenWireFormat.doUnmarshal(OpenWireFormat.java:350)
at org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:276)
at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:142)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NoSuchMethodError: org.apache.activemq.command.ConnectionInfo.isClientMaster()Z
at org.apache.activemq.openwire.v2.ConnectionInfoMarshaller.tightMarshal1(ConnectionInfoMarshaller.java:107)
at org.apache.activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:234)
at org.apache.activemq.transport.tcp.TcpTransport.oneway(TcpTransport.java:124)

...

(more stack trace available if needed)

I am using the following maven libraries:

<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-core</artifactId>
<version>4.1.1</version>
</dependency>
<dependency>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.logicblaze.lingo</groupId>
<artifactId>lingo</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
<version>2.0</version>
</dependency>

Thanks,
Jason

concurrent consumer issue

2007-09-12T06:20:53Z

I am trying to get concurrent consumer working with Lingo 1.3, Spring 2.0, ActiveMQ 4.1.

Following the above example mentioned in lingo's home page "Asynchronous calls and callbacks with Lingo and ActiveMQ" and Sanjiv's blog (http://www.jroller.com/sjivan/entry/asynchronous_calls_and_callbacks_using), I successfully tested with client and server on the same machine, i.e. the server can consumer the multiply clients concurrently. But if I move the server onto different machine, the clients will get concurrentTimeout Exception.

The brokerURL are configured to use broker's IP address on both client and server side.

Although by NOT configuring concurrent consumer in the xml file on the server side, i.e. similar to above example of:

<bean id="optimizerServer" class="org.logicblaze.lingo.jms.JmsServiceExporter" singleton="true">
<property name="destination" ref="optimizerDestination"/>
<property name="service" ref="optimizerServiceImpl"/>
<property name="serviceInterface" value="org.sanjiv.lingo.common.OptimizerService"/>
<property name="connectionFactory" ref="jmsFactory"/>
</bean>

in this way, the client and server on different machine can communicate with each other. But this does not have concurrentConsumer function. i.e.

similar configuration like below does not work:

<bean id="optimizerServer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
<property name="concurrentConsumers" value="20"/>
<property name="destination" ref="optimizerDestination"/>
<property name="messageListener" ref="optimizerServerListener"/>
<property name="connectionFactory" ref="jmsFactory"/>
</bean>

Any suggestions?

Thanks

Martin

Implementing synchronized beans with lingo?

2007-08-26T07:53:12Z

Good day!

Is instance-level synchronization possible with Lingo?
On Oracle database I would just use transaction level = serializable to achieve my goals, but looks like we have no Oracle on this project :(

The situation is: we will have the (possibly) clustered application, and one of the business tasks work like the following. There are X time periods each day with Y slots available for users. When users claim to use slot(s) we should:

1. Check if there is enough slots left;
2. Accept (or reject) user's request;
3. Update the slots state.

We were happy with the "public void synchronized claim (User user, int slots);" method signature in non-clustered environment (the RequestManager with the mentioned method was just a Spring-managed singleton bean), which was working with any database.

But clustered (or EJB) environment ruins our architecture completely - since there are several instances of RequestManager bean in the Session Pool, the "synchronized" keyword cannot guarantee absolutely nothing. Even worse - these instances will be running in different JVMs so I cannot do the "synchronize on static field" trick.

Are there any workarounds available with lingo? I supposed that it might be useful having plain old Spring application with singleton beans (and "synchronized" methods) exposed via lingo's MultiplexingRequestor to achieve my goals. But I still doubt regarding this.

Any comments/suggestions please? Are there any other solutions available?

Re: Help on running Lingo Examples

2007-07-30T15:44:26Z

Here you find a tutorial with full code examples.

Re: Help on running Lingo Examples

2007-07-25T15:06:38Z

Here's an article I wrote a while ago : http://docs.codehaus.org/display/LINGO/2006/07/07/Asynchronous+calls+and+callbacks+with+Lingo+and+ActiveMQ

The example uses Lingo 1.1 with Active MQ 3.2 but most of whats written still applies. I have since ported the example to Lingo 1.3 and Active MQ 4.1 but haven't had a chance to post it on my blog. I might do it one of these days.

I'm not sure how familiar you are with Spring Remoting. If you're not at all familiar with it, you should read up on it first : http://www.springframework.org/docs/reference/remoting.html

Sanjiv

On 7/25/07, Simon Sekat <sekatsimon@...> wrote:

Dear all,

1. Please post resources on learning Lingo. So far, I can't find any books that talk about this promising project.
2. I don't know how to run the examples ( http://docs.codehaus.org/display/LINGO/Example). Is there any document talks it in details?

Thank you all,

--
A newbie to Lingo
Simon S.

Help on running Lingo Examples

2007-07-25T13:21:35Z

Dear all,

1. Please post resources on learning Lingo. So far, I can't find any books that talk about this promising project.
2. I don't know how to run the examples ( http://docs.codehaus.org/display/LINGO/Example). Is there any document talks it in details?

Thank you all,

--
A newbie to Lingo
Simon S.

lingo EJB

2007-05-19T13:01:02Z

Hello,
Can any one please suggest me the benefits of Lingo with Spring over MDB in EJB 3.0 Container, besides the drawbacks of heavy weights EJB container.

Thanks in advance

Is this multi-thread safe? - calling methods on the proxy object returned by JmsProxyFactoryBean

2007-04-27T14:54:46Z

Is it possible to call methods on the object returned by JmsProxyFactoryBean.getObject() from multiple threads simultaneously? Do the method calls get serialized somehow?
Is there any multi-thread synchronization somewhere down the line?
If the receiving end-point of the method call (a different process) dies, will there be a release of synchronized locks somewhere?

Please Help: Getting Exception java.lang.NoSuchMethodError: isDuplexConnection()Z

2007-02-17T13:40:36Z

I managed to get a test-client communicating using tcp://localhost:8088 with a test-server which starts an embedded ActiveMQ broker. But whenever I try to call a remote method, the server throws the following exception:

Exception in thread "ActiveMQ Transport Server: tcp://sioux:8088" java.lang.NoSuchMethodError: org.apache.activemq.command.BrokerInfo.isDuplexConnection()Z
at org.apache.activemq.openwire.v2.BrokerInfoMarshaller.tightMarshal1(BrokerInfoMarshaller.java:109)

The versions i use are Lingo 1.3, ActiveMQ 4.1.0 and the Spring Framework 2.0. I tried also with ActiveMQ 4.2.0-SNAPSHOT but got the same exception.

Does anyone have a clue how I can solve this problem?
Thanks for any hint!

Martin

What does the UsageManager actually measure??

2007-02-13T14:14:15Z

This may seem like a strange question, but what does the ActiveMQ MemoryManager class actually do, or what is the usage that it tries to manage?

We have a Lingo application which might get swamped with requests under certain circumstances. This causes the request queue lengths to grow quite large. The service threads can ultimately process these requests, but it can take a long time, and our clients end up all timing out. (One way around this might be making our services @OneWay, but unfortunately that requires extensive refactoring of our application)

We'd like a situation where the broker would throw a runtime exception if the request queue length grows too large. One way to do this, we thought would be to limit the available memory used by the broker, by defining a UsageManager for our broker, and setting the limit to a fairly small value (64K). This however doesn't seem to do anything, however. From jconsole, we can see that MemoryPercentageUsed is always 0, even if there are a large number of large messages in the Lingo request queue. (We also try to set the memoryLimit on the PolicyEntry on the queue. That also seems to have no effect). We even set up a custom UsageListener on the UsageManager. That seems to be invoked every so often when requests come in, but percent used just goes back and forth between 0 and 2 percent.

Something seems to be measured, but it doesn't seem to be the total size of objects in that queue. What are doing wrong? Is there a simpler way to limit the total number of messages in queue?

BTW , we're running ActiveMQ 4.0.2 with Lingo 1.3

thanks if anyone has any insight ...

--- jerome