| Package | Description | 
|---|---|
| com.hazelcast.collection | This package contains classes to support the collection API. | 
| com.hazelcast.transaction | Provides interfaces/classes for Hazelcast transaction support. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | IQueue<E>Concurrent, blocking, distributed, observable queue. | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | TransactionalQueue<E>Transactional implementation of  BaseQueue. | 
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