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Running out of pools using CompleteableFuture and Spring Transaction


Running out of pools using CompleteableFuture and Spring Transaction

By : Jamey Diepbrink
Date : October 22 2020, 08:10 AM
wish helps you If you want to have each #loadPartition run on it's own thread and in it's own transaction, you'll need to:
Mark #loadPartition as @Transactional Invoke the proxied #loadPartition method so that the @Transactional works. You can do this either by self-autowiring or calling the method from another proxied class
code :
@Component
public class MyLoaderClass {

    // Autowire in this with constructor injection or @Autowired
    private MyLoaderClass myLoaderClass;

    // Removed @Transactional annotation
    public void loadErUp() {
        myLoaderClass.loadPartition(holder, zdt);
        ...
    }

    // 1) Add the @Transactional annotation to #loadPartition
    // 2) Make public to use self-autowiring (or refactored class, per link above)
    @Transactional
    public <T> long loadPartition(long partitionKey, ZonedDateTime zdt) {
        ...
        // Can remove TransactionSyncManager call
        ...
    }

}


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Transaction timeouts and connection pools issue

Transaction timeouts and connection pools issue


By : karenjonathan2000
Date : March 29 2020, 07:55 AM
hope this fix your issue In an asp.net 2.0 application I maintain, we were experiencing issues with transaction aborted errors (timeout). Code that fails seems to cause a timeout, then the page logging functionality that uses transactionscope (default constructor) fails (but not always). The timeout is set to 2 minutes. , First, if you can, I would change your code to be:
code :
Using scope As New TransactionScope(TransactionScopeOption.Required, New TimeSpan(0, 0, CInt(TransactionTimeout)))
    Dim scope As TransactionScope
    Try
        scope = New TransactionScope(TransactionScopeOption.Required, New TimeSpan(0, 0, CInt(TransactionTimeout)))

        ' **A method call that fails is here**

        ' **other code is here**
        scope.complete()
    Finally
        If scope IsNot Nothing Then
            Try
                scope.Dispose()
            Catch
            End Try
        End If
    End Try
What advantage is there to using Spring @Async vs. CompleteableFuture directly?

What advantage is there to using Spring @Async vs. CompleteableFuture directly?


By : S.Stalin
Date : March 29 2020, 07:55 AM
help you fix your problem Your application is managed by the container. Since it's discouraged to spawn Threads on you own, you can let the container inject a managed Executor.
code :
@Service
class MyService {
  @Autowired
  private Executor executor;

  public CompletableFuture<?> compute() {
    return CompletableFuture.supplyAsync(() -> /* compute value */, executor);
  }
}
How to rollback outer transaction in case of failed inner transaction in but inner transaction should save data Spring

How to rollback outer transaction in case of failed inner transaction in but inner transaction should save data Spring


By : user2768898
Date : March 29 2020, 07:55 AM
To fix this issue Configure the inner transactional method as Propagation.REQUIRES_NEW such that it will always commit (i.e save the data) when the method completes whether the outer transactional method rollbacks or not.
Also, make sure outer method does not self invocation the inner method as @Transactional does not work in this case (See Method visibility and @Transactional section in docs).
code :
@Service
public class Service1 {

    @Autowired
    private Service2 service2;

    @Transactional(rollbackFor=Exception.class)
    public void test1(Account account) throws Exception {
        DOA.save(account);
        status = service2.test2(account);
        if(status!='SUCCESS'){
            throw new Exception("Api call failed");
        }
    }
}

@Service
public class Service2{

    @Transactional(propagation=Propagation.REQUIRES_NEW)
    public void test2(Account account) {
        response // API Call
        DOA.save(response);
        return response.status;
    }
}
Wrapping and turning a single CompleteableFuture<OlderCat> to a bulk operation with result of CompleteableFuture&l

Wrapping and turning a single CompleteableFuture<OlderCat> to a bulk operation with result of CompleteableFuture&l


By : Jay
Date : March 29 2020, 07:55 AM
this will help You are almost there. You don't need to put an exceptionally() on the initial futures, but you should use handle() instead of thenApply() after the allOf(), because if any future fails, the allOf() will fail as well.
When processing the futures, you can then just filter out the failing ones from the result, and rebuild the expected map:
code :
Map<String, CompletableFuture<OlderCat>> completableFutures = cats
        .stream()
        .collect(toMap(Cat::getName, c -> asyncGetOlderCat(c.getName())));

CompletableFuture<Void> allFutures = CompletableFuture
        .allOf(completableFutures.values().toArray(new CompletableFuture[0]));

return allFutures.handle((dummy, ex) ->
        completableFutures.entrySet().stream()
                .filter(entry -> !entry.getValue().isCompletedExceptionally())
                .collect(toMap(Map.Entry::getKey, e -> e.getValue().join())));
How do I get transaction info in Spring whether transaction is committed or rollback in a declarative transaction manage

How do I get transaction info in Spring whether transaction is committed or rollback in a declarative transaction manage


By : Alberto C
Date : March 29 2020, 07:55 AM
should help you out If transaction is in scope you can get TransactionStatus from TransactionAspectSupport.currentTransactionStatus(). For example:
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