io.druid.client

Interface ServerView.SegmentCallback

All Known Implementing Classes:

ServerView.BaseSegmentCallback

Enclosing interface:

ServerView

public static interface ServerView.SegmentCallback

Method Summary

Modifier and Type	Method and Description
ServerView.CallbackAction	segmentAdded(DruidServerMetadata server, DataSegment segment) Called when a segment is added to a server.
ServerView.CallbackAction	segmentRemoved(DruidServerMetadata server, DataSegment segment) Called when a segment is removed from a server.
ServerView.CallbackAction	segmentViewInitialized()

Method Detail

segmentAdded

ServerView.CallbackAction segmentAdded(DruidServerMetadata server,
                                       DataSegment segment)

Called when a segment is added to a server. The return value indicates if this callback has completed its work. Note that even if this callback indicates that it should be unregistered, it is not possible to guarantee that this callback will not get called again. There is a race condition between when this callback runs and other events that can cause the callback to be queued for running. Thus, callbacks shouldn't assume that they will not get called again after they are done. The contract is that the callback will eventually be unregistered, enforcing a happens-before relationship is not part of the contract.

Parameters:

server - The server that added a segment

segment - The segment that was added

Returns:

UNREGISTER if the callback has completed its work and should be unregistered. CONTINUE if the callback should remain registered.

segmentRemoved

ServerView.CallbackAction segmentRemoved(DruidServerMetadata server,
                                         DataSegment segment)

Called when a segment is removed from a server. The return value indicates if this callback has completed its work. Note that even if this callback indicates that it should be unregistered, it is not possible to guarantee that this callback will not get called again. There is a race condition between when this callback runs and other events that can cause the callback to be queued for running. Thus, callbacks shouldn't assume that they will not get called again after they are done. The contract is that the callback will eventually be unregistered, enforcing a happens-before relationship is not part of the contract.

Parameters:

server - The server that removed a segment

segment - The segment that was removed

Returns:

UNREGISTER if the callback has completed its work and should be unregistered. CONTINUE if the callback should remain registered.

segmentViewInitialized

ServerView.CallbackAction segmentViewInitialized()