com.hazelcast.spi

Interface PreJoinAwareService

All Known Subinterfaces:

InternalEventService

All Known Implementing Classes:

AbstractCacheService, CacheService, ClientEngineImpl, ClusterWideConfigurationService, EventServiceImpl, RaftService

public interface PreJoinAwareService

Services which need to perform operations on a joining member just before the member is set as joined must implement this interface. These operations are executed on the joining member before it is set as joined, in contrast to PostJoinAwareService.getPostJoinOperation()s which are executed on the joining member after it is set as joined. The practical outcome is that pre-join operations are already executed before the HazelcastInstance is returned to the caller, while post-join operations may be still executing.

Since:

3.9

Method Summary

Modifier and Type	Method and Description
Operation	getPreJoinOperation() An operation to be executed on the joining member before it is set as joined.

Method Detail

getPreJoinOperation

Operation getPreJoinOperation()

An operation to be executed on the joining member before it is set as joined. As is the case with PostJoinAwareService.getPostJoinOperation()s, no partition locks, no key-based locks, no service level locks, no database interaction are allowed. Additionally, a pre-join operation is executed while the cluster lock is being held on the joining member, so it is important that the operation finishes quickly and does not interact with other locks. The Operation.getPartitionId() method should return a negative value. This means that the operations should not implement PartitionAwareOperation.

Pre join operations should return response, which may also be a null response.

Returns:

an operation to be executed on joining member before it is set as joined. Can be null.