Producer - Add scope for singleton to allow using non singleton producers to
address thread safety
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Key: CAMEL-1644
URL: https://issues.apache.org/activemq/browse/CAMEL-1644
Project: Apache Camel
Issue Type: Improvement
Components: camel-core
Affects Versions: 2.0-M1
Reporter: Claus Ibsen
Assignee: Claus Ibsen
Fix For: 2.0.0
See CAMEL-1641 that is a bug reported about the FTP producer not being thread
safe for concurrent usage.
To address this we should consider supporting Producers to implement
{{IsSingleton}} and return {{false}} to indicate that a producer should not be
cached in the {{ProducerCache}}.
We should also introduce a {{ProducerCallback}} to allow safely usages of a
producer and letting Camel handle the correct resource management to
- find the producer (singletons)
- add to cache if needed
- or create it
- start it
- invoke the callback
- stop it for non singletons
etc.
In the future we can support a pool of non singleton producers as well and with
this callback users of this producer can safely use it without worrying how to
get it from a pool and how to safely return it back without leaking.
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