Blocking calls in onMessage

I'm sure this one has been asked before, but I can't seem to find anything:
I have a servlet client listening to a tempory message queue. The sample code
for such a thing from BEA use object.wait and notify to block and collect all
the messages, and exits only when a preset count of messages received is reached.
In my case I know that number as well, but what happens if the servlet doesn't
get the required number? It will sit in the blocked state FOREVER. I'm thinking
of setting a java.util.timer to wake up after a certain time, but I hear that
is bad news in an EJB system.
Is the 'Timer for Application Servers' for real? I saw the code, but is it really
usuable? And if not how in heavens name do you timeout a blocked queue listener?
Thanks in advance.

"Don Henton" <[email protected]> wrote in message news:40868b31$[email protected]..
>
I'm sure this one has been asked before, but I can't seem to find anything:
I have a servlet client listening to a tempory message queue. The sample code
for such a thing from BEA use object.wait and notify to block and collect all
the messages, and exits only when a preset count of messages received is reached.
In my case I know that number as well, but what happens if the servlet doesn't
get the required number? It will sit in the blocked state FOREVER. I'm thinking
of setting a java.util.timer to wake up after a certain time, but I hear that
is bad news in an EJB system.You can use wait(long time) method to ensure that you don't wait forever.
Regards,
Slava Imeshev

Similar Messages

Assertion failed: poll() is a blocking call and cannot be called on the Service thread

Hi
We are getting a strange issue, the application successfully joins the cluster but after start failing with following exception.
The cluster have three nodes storage disabled web-logic and two standalone coherence JVM's, we are using distributed cache with Local scheme
<Error> (thread=DistributedCache, member=4): Assertion failed: poll() is a blocking call and cannot be called on the Service thread
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:5)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$BinaryMap.get(PartitionedCache.CDB:26)
at com.tangosol.util.ConverterCollections$ConverterMap.get(ConverterCollections.java:1655)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ViewMap.get(PartitionedCache.CDB:1)
at com.tangosol.coherence.component.util.SafeNamedCache.get(SafeNamedCache.CDB:1)
at com.thehartford.pi.core.referencedata.dao.cachedaoimpl.ReferenceCacheDAOImpl.getReferenceData(Unknown Source)
at com.thehartford.pi.core.caching.cachestore.ReferenceCacheStore.load(Unknown Source)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheLoaderCacheStore.load(ReadWriteBackingMap.java:6132)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheStoreWrapper.loadInternal(ReadWriteBackingMap.java:5616)
at com.tangosol.net.cache.ReadWriteBackingMap$StoreWrapper.load(ReadWriteBackingMap.java:4698)
at com.tangosol.net.cache.ReadWriteBackingMap.get(ReadWriteBackingMap.java:717)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$Storage.get(PartitionedCache.CDB:10)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onGetRequest(PartitionedCache.CDB:23)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$GetRequest.run(PartitionedCache.CDB:1)
at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheKeyRequest.onReceived(DistributedCacheKeyRequest.CDB:12)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:34)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:33)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.onNotify(PartitionedService.CDB:3)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onNotify(PartitionedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:722)
ERROR 2013-09-20 09:06:42,515 : [2013-09-20 09:06:42.515/8740.228 Oracle Coherence GE 3.7.1.0 <Error> (thread=DistributedCache, member=4): Assertion failed: poll() is a blocking call and cannot be called on the Service thread
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:5)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$BinaryMap.get(PartitionedCache.CDB:26)
at com.tangosol.util.ConverterCollections$ConverterMap.get(ConverterCollections.java:1655)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ViewMap.get(PartitionedCache.CDB:1)
at com.tangosol.coherence.component.util.SafeNamedCache.get(SafeNamedCache.CDB:1)
at com.thehartford.pi.core.referencedata.dao.cachedaoimpl.ReferenceCacheDAOImpl.getReferenceData(Unknown Source)
at com.thehartford.pi.core.caching.cachestore.ReferenceCacheStore.load(Unknown Source)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheLoaderCacheStore.load(ReadWriteBackingMap.java:6132)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheStoreWrapper.loadInternal(ReadWriteBackingMap.java:5616)
at com.tangosol.net.cache.ReadWriteBackingMap$StoreWrapper.load(ReadWriteBackingMap.java:4698)
at com.tangosol.net.cache.ReadWriteBackingMap.get(ReadWriteBackingMap.java:717)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$Storage.get(PartitionedCache.CDB:10)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onGetRequest(PartitionedCache.CDB:23)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$GetRequest.run(PartitionedCache.CDB:1)
at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheKeyRequest.onReceived(DistributedCacheKeyRequest.CDB:12)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:34)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:33)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.onNotify(PartitionedService.CDB:3)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onNotify(PartitionedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)

Hi
The problem is that you are making a re-entrant call back into a cache service from the service thread or worker thread of a cache service. This is a bad thing to do as you risk deadlocking your cluster by consuming all of the threads in the service. From the stack trace it looks like you are doing a get on a cache which is calling through to a cache store which is then doing a get on another cache.
For example, you have done a "get" on a cache, that has now consumed a worker thread (call it Thread-1), that thread is calling the cache store which is doing a get on another cache in the same cache service so will now consume another thread (call it Thread-2) so you now have two threads in use, Thread-1 will not return until Thread-2 completes. Now say you had 2 worker threads on your cache service and two "get" calls came in at the same time, Get-1 and Get-2. Both worker threads are now in use so when Get-1 calls the cache store to do a get on the other cache then it has to wait for a worker thread to become free to process the get. The same applies to Get-2, it is calling the cache store and waiting for a thread to become free. The problem is no threads will become free as they are all waiting. Hopefully that is a clear enough explanation of why you get the warning.
Read this Constraints on Re-entrant Calls - 12c (12.1.2) This is for 12.1.2 but the same applies for any Coherence version.
JK

AssertionException poll() is blocking call cant be called on Service thread

I'm getting this:
Exception in thread "main" (Wrapped: Failed request execution for DistributedCache service on Member(Id=1, Timestamp=2009-07-16 15:23:58.704,
Address=192.168.10.167:8088, MachineId=25255, Location=machine:box2,process:4700, Role=CoherenceServer)) com.tangosol.util.AssertionException: poll()
is a blocking call and cannot be called on the Service thread
     at com.tangosol.util.Base.ensureRuntimeException(Base.java:293)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.tagException(Grid.CDB:36)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onPutRequest(DistributedCache.CDB:66)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$PutRequest.run(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.net.message.requestMessage.DistributedCacheKeyRequest.onReceived(DistributedCacheKeyRequest.CDB:12)
     at com.tangosol.coherence.component.net.message.requestMessage.distributedCacheKeyRequest.ExtendedKeyRequest.onReceived(ExtendedKeyRequest.CDB:4)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:9)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:136)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onNotify(DistributedCache.CDB:3)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:37)
     at java.lang.Thread.run(Thread.java:619)
Caused by: com.tangosol.util.AssertionException: poll() is a blocking call and cannot be called on the Service thread
     at com.tangosol.coherence.Component._assertFailed(Component.CDB:12)
     at com.tangosol.coherence.Component._assert(Component.CDB:3)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:4)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$BinaryMap.containsKey(DistributedCache.CDB:24)
     at com.tangosol.util.ConverterCollections$ConverterMap.containsKey(ConverterCollections.java:1494)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$ViewMap.containsKey(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.util.SafeNamedCache.containsKey(SafeNamedCache.CDB:1)
     at oms.ExecutionMapTrigger.process(ExecutionMapTrigger.java:22)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.processTriggers(DistributedCache.CDB:12)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.put(DistributedCache.CDB:30)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onPutRequest(DistributedCache.CDB:37)
     ... 8 moreIt's caused by doing a CacheFactory.getCache(...) inside a MapTrigger's process(MapTrigger.Entry entry) method. Is there some other way I can access a cache from another cache's MapTrigger? My MapTrigger looks like this. The idea of course is that when new Executions are placed in the cache, Coherence updates a Position in the positions cache in response to this event.
public class ExecutionMapTrigger implements MapTrigger {
    public ExecutionMapTrigger() {
    InvocableMap.EntryProcessor positionFillProc = new PositionFillProcessor();
    public void process(MapTrigger.Entry entry) {
        Execution e = (Execution)entry.getValue();
        Position.connectToCache(); // CacheFactory.getCache("positions");
        PositionKey positionKey = new PositionKey(e.getSymbol(), e.getAccount());
        if (!Position.cache.containsKey(positionKey)) {
           System.out.println("\tNEW position: " + e.getAccount() + " " + e.getSymbol() );
           Position p = new Position();
           p.setSymbol(e.getSymbol());
           p.setAccount(e.getAccount());
           Position.cache.put(positionKey, p);
        } else {
           System.out.println("\tEXISTING position: " + e.getAccount() + " " + e.getSymbol() + " " + Position.cache.get(positionKey));
        Position.cache.invoke(positionKey, positionFillProc);
    // ---- hashCode() and equals() must be implemented
    public boolean equals(Object o) {
        return o != null && o.getClass() == this.getClass();
    public int hashCode() {
        return getClass().getName().hashCode();
}Is there a different way I should be doing this? Using a BackingMapListener?
Thanks,
Andrew

I am also stuck with similar issue. I used a backingmap listener and wanted to transformation on the data sent by the client. I am unable to update another cache.
     CoherenceTransformer transformer= new CoherenceTransformer();
          TransformedTransactionData transformedRecord = new TransformedTransactionData() ;
          ReconTransformedRecord reconTransformedRecord = new ReconTransformedRecord();
     //     NamedCache cache = CacheFactory.getCache("TxnData_TransformedRecordCache");
          System.out.println(" < <<<< Entry Inserted in ImportRecord Cache>>>>");
     //     PivotCreationListener pivotcreator ;
          ReconImportRecord i = (ReconImportRecord) event.getNewValue();
          if (logger.isDebugEnabled()) {
               logger.debug(i.getImportRecord().toString());
          transformedRecord = (TransformedTransactionData) transformer.transform((TransactionData) i.getImportRecord(),transformedRecord);
          if (logger.isDebugEnabled()) {
               logger.debug(transformedRecord.toString());
          reconTransformedRecord.setKey(i.getKey());
          reconTransformedRecord.setTransformedRecord(transformedRecord);
          System.out.println(reconTransformedRecord);
     Thread thread = new Thread(new ProcessorThread(reconTransformedRecord));
          thread.start();
2010-10-26 05:22:34.171/43.280 Oracle Coherence GE 3.6.0.0 <Warning> (thread=DistributedCache:PartitionedPofCache, member=1): Application code running on "PartitionedPofCache" service thread(s) should not call ensureCache as this may result in deadlock. The most common case is a CacheFactory call from a custom CacheStore implementation.
2010-10-26 05:22:34.171/43.281 Oracle Coherence GE 3.6.0.0 <Error> (thread=DistributedCache:PartitionedPofCache, member=1): Assertion failed: poll() is a blocking call and cannot be called on the Service thread
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:5)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.ensureCache(PartitionedCache.CDB:29)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.ensureCache(PartitionedCache.CDB:36)
     at com.tangosol.coherence.component.util.safeService.SafeCacheService.ensureCache$Router(SafeCacheService.CDB:1)
     at com.tangosol.coherence.component.util.safeService.SafeCacheService.ensureCache(SafeCacheService.CDB:33)
     at com.tangosol.net.DefaultConfigurableCacheFactory.ensureCache(DefaultConfigurableCacheFactory.java:875)
     at com.tangosol.net.DefaultConfigurableCacheFactory.configureCache(DefaultConfigurableCacheFactory.java:1231)
     at com.tangosol.net.DefaultConfigurableCacheFactory.ensureCache(DefaultConfigurableCacheFactory.java:290)
     at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:735)
     at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:712)
     at com.xxx.listeners.ProcessorThread.<init>(ProcessorThread.java:10)
Few Questions
How do i start a thread that is not involved with service thread ?
How do I directly update a backingmap. Some example would help.

I keep getting calls from a block caller id and it's some dude speaking arabian what do i do? How do i stop this?

I keep getting calls from a block caller id and it's some dude speaking arabian what do i do? How do i stop this?

Stop answering calls with blocked numbers. If it's someone who really wants to talk to you, they'll leave you a message and you can call them back.

How can we encourage Apple to develop blocking calls from specific numbers?

Looking through posts on here, I see that neither AT&T nor the iPhone itself permits an iPhone owner to block calls from one or more specific numbers.
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In reading posts here and on AT&T, I gather this is not an uncommon problem. I assume that even if AT&T is unwilling to institute call blocking, this is a problem Apple could solve with iPhone software. What's the best way to encourage Apple to include this in a future iPhone software update?
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This would be something ATT would have to do since they provide the actual phone service.
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How do I block calls and texts on a prepaid phone? Says service unavailble when I try to do it through VZW

How do I block calls and texts on a prepaid phone? Says service unavailble when I try to do it through VZW

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For your convenience, you can also reach our Prepaid customer service department at 888-294-6804 for help, as well.
LasinaH_VZW
Follow us on Twitter @VZWSupport
If my response answered your question please click the "Correct Answer" button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!

How can I block calls on my G3 when Verizon took away that functionality?

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Called well actually chatted with Tech Support this morning...the option is not there and Tech Support of course would not admit that Verizon contracted with LG to have their phones produced without that option (though I explained T-Mobile G3 has the option) Tech support started wanting to change my plan to lower my plan price to offset the cost of Family Base-- I called ** on this --no changes made. Was given a number to contact LG but I doubt that will get me anywhere as well; what about the Mister Number app? I heard that was supposed to be a good one as well....but anyway I quite frankly told the representative that I could only believe that this was greed on Verizon's part since the functionality was removed but in order to use the functionality I have to pay for it on their site and that I refused to do so. Like you stated I should not have to pay for privacy. Very frustrating; she also tried telling me that there may be an update in the future that may change this on my device but she couldn't speak to when; again I am calling **...I have heard nothing but bad news on the Lollipop update and wont be doing that until I see all the bugs are worked out

How to block calls based ANI for individual user?

I want to know how to block calls based on ANI for individual user in CUCM? Lets say if the individual wants to block calls from certain number.
Malicious call id - softkey will not work for our purpose.
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thanks,

How to block calls has been asked hundreds, and hundreds of times at CSC, a simple search would have provided you with all the necesarry information. Please search before you ask
https://supportforums.cisco.com/docs/DOC-19628
HTH
java
if this helps, please rate
www.cisco.com/go/pdihelpdesk

How can I interrupt the blocking call when call timeout?

Hi,Guys
I wrote an application server(daemon process) to talk with oracle server
continuous which used oracle9 OCCI lib, each 5 min it executes the procedure
on the DB server.
Now I have come cross a problem:
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Can you set a picture for unknown or blocked calls

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Blocking Calls on Spring using Palm Pre

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Post relates to:

Same issue, Sprint says there is no way they can block calls the only option they provided was changing phone numbers.
If Palm won't include a Call Filtering program with WebOS, then why not allow third party developers to do it for you? Windows Mobile, Blackberry, and Android all have 3rd party call block applications that will block certain numbers or private/unknown callers.
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I hope Palm will re-consider adding some type of call filter to WebOS in an OTA update, or open up the programming so a 3rd party can do it instead.

Blocking calls to Canada from USA

Is there a way to block calls to Canada on certain phone lines?

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Hope all works out,
--kwm1337

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Hello:
Is there a way to block calls inbound on the gateway router (coming in via the Pri)coming into an ip phone?
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Trying to block some 1-800 numbers from calling into an ip phone.
Thanks.

Thank you, much.
So based on this: I am thinking of the following configuration:
#voice translation-rule 1
#rule 1 reject /1800*/
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Blocking calls in onMessage

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