Package org.apache.druid.client

Class ServerView.BaseSegmentCallback

java.lang.Object

org.apache.druid.client.ServerView.BaseSegmentCallback

All Implemented Interfaces:

ServerView.SegmentCallback

Enclosing interface:

ServerView

public abstract static class ServerView.BaseSegmentCallback
extends Object
implements ServerView.SegmentCallback

Constructor Summary

Constructors

Constructor	Description
BaseSegmentCallback()

Method Summary

Modifier and Type	Method	Description
ServerView.CallbackAction	segmentAdded(DruidServerMetadata server, org.apache.druid.timeline.DataSegment segment)	Called when a segment is added to a server.
ServerView.CallbackAction	segmentRemoved(DruidServerMetadata server, org.apache.druid.timeline.DataSegment segment)	Called when a segment is removed from a server.
ServerView.CallbackAction	segmentSchemasAnnounced(SegmentSchemas segmentSchemas)	Called when segment schema is announced.
ServerView.CallbackAction	segmentViewInitialized()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BaseSegmentCallback

public BaseSegmentCallback()

Method Detail

segmentAdded

public ServerView.CallbackAction segmentAdded(DruidServerMetadata server,
                                              org.apache.druid.timeline.DataSegment segment)

Description copied from interface: ServerView.SegmentCallback

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.

Specified by:

segmentAdded in interface ServerView.SegmentCallback

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

public ServerView.CallbackAction segmentRemoved(DruidServerMetadata server,
                                                org.apache.druid.timeline.DataSegment segment)

Description copied from interface: ServerView.SegmentCallback

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.

Specified by:

segmentRemoved in interface ServerView.SegmentCallback

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.

segmentSchemasAnnounced

public ServerView.CallbackAction segmentSchemasAnnounced(SegmentSchemas segmentSchemas)

Description copied from interface: ServerView.SegmentCallback

Called when segment schema is announced.

Specified by:

segmentSchemasAnnounced in interface ServerView.SegmentCallback

Parameters:

segmentSchemas - segment schema

Returns:

continue or unregister

segmentViewInitialized

public ServerView.CallbackAction segmentViewInitialized()

Specified by:

segmentViewInitialized in interface ServerView.SegmentCallback