Package org.elasticsearch.action.support.single.shard

Class TransportSingleShardAction<Request extends SingleShardRequest<Request>,Response extends ActionResponse>

java.lang.Object

org.elasticsearch.common.component.AbstractComponent

org.elasticsearch.action.support.TransportAction<Request,Response>

org.elasticsearch.action.support.single.shard.TransportSingleShardAction<Request,Response>

Direct Known Subclasses:

TransportAnalyzeAction, TransportExplainAction, TransportFieldCapabilitiesIndexAction, TransportGetAction, TransportGetFieldMappingsIndexAction, TransportShardMultiGetAction, TransportShardMultiTermsVectorAction, TransportTermVectorsAction

public abstract class TransportSingleShardAction<Request extends SingleShardRequest<Request>,Response extends ActionResponse>
extends TransportAction<Request,Response>

A base class for operations that need to perform a read operation on a single shard copy. If the operation fails, the read operation can be performed on other shard copies. Concrete implementations can provide their own list of candidate shards to try the read operation on.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	TransportSingleShardAction.InternalRequest	Internal request class that gets built on each node.

Field Summary

Fields

Modifier and Type	Field	Description
protected ClusterService	clusterService
protected TransportService	transportService

Fields inherited from class org.elasticsearch.common.component.AbstractComponent

deprecationLogger, logger, settings

Fields inherited from class org.elasticsearch.action.support.TransportAction

actionName, indexNameExpressionResolver, taskManager, threadPool

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	TransportSingleShardAction(Settings settings, java.lang.String actionName, ThreadPool threadPool, ClusterService clusterService, TransportService transportService, ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, java.util.function.Supplier<Request> request, java.lang.String executor)

Method Summary

Modifier and Type	Method	Description
protected ClusterBlockException	checkGlobalBlock(ClusterState state)
protected ClusterBlockException	checkRequestBlock(ClusterState state, TransportSingleShardAction.InternalRequest request)
protected void	doExecute(Request request, ActionListener<Response> listener)
protected boolean	isSubAction()	Tells whether the action is a main one or a subaction.
protected abstract Response	newResponse()
protected abstract boolean	resolveIndex(Request request)
protected void	resolveRequest(ClusterState state, TransportSingleShardAction.InternalRequest request)
protected abstract Response	shardOperation(Request request, ShardId shardId)
protected abstract ShardsIterator	shards(ClusterState state, TransportSingleShardAction.InternalRequest request)	Returns the candidate shards to execute the operation on or null the execute the operation locally (the node that received the request)

Methods inherited from class org.elasticsearch.common.component.AbstractComponent

logDeprecatedSetting, logRemovedSetting, nodeName

Methods inherited from class java.lang.Object

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

Methods inherited from class org.elasticsearch.action.support.TransportAction

doExecute, execute, execute, execute, execute

Field Detail

clusterService

protected final ClusterService clusterService

transportService

protected final TransportService transportService

Constructor Detail

TransportSingleShardAction

protected TransportSingleShardAction(Settings settings,
                                     java.lang.String actionName,
                                     ThreadPool threadPool,
                                     ClusterService clusterService,
                                     TransportService transportService,
                                     ActionFilters actionFilters,
                                     IndexNameExpressionResolver indexNameExpressionResolver,
                                     java.util.function.Supplier<Request> request,
                                     java.lang.String executor)

Method Detail

isSubAction

protected boolean isSubAction()

Tells whether the action is a main one or a subaction. Used to decide whether we need to register the main transport handler. In fact if the action is a subaction, its execute method will be called locally to its parent action.

doExecute

protected void doExecute(Request request,
                         ActionListener<Response> listener)

Specified by:

doExecute in class TransportAction<Request extends SingleShardRequest<Request>,Response extends ActionResponse>

shardOperation

protected abstract Response shardOperation(Request request,
                                           ShardId shardId)
                                    throws java.io.IOException

Throws:

java.io.IOException

newResponse

protected abstract Response newResponse()

resolveIndex

protected abstract boolean resolveIndex(Request request)

checkGlobalBlock

protected ClusterBlockException checkGlobalBlock(ClusterState state)

checkRequestBlock

protected ClusterBlockException checkRequestBlock(ClusterState state,
                                                  TransportSingleShardAction.InternalRequest request)

resolveRequest

protected void resolveRequest(ClusterState state,
                              TransportSingleShardAction.InternalRequest request)

shards

@Nullable
protected abstract ShardsIterator shards(ClusterState state,
                                         TransportSingleShardAction.InternalRequest request)

Returns the candidate shards to execute the operation on or null the execute the operation locally (the node that received the request)