Package org.apache.solr.handler

Class RequestHandlerBase

java.lang.Object

org.apache.solr.handler.RequestHandlerBase

All Implemented Interfaces:

AutoCloseable, ApiSupport, SolrInfoBean, NestedRequestHandler, SolrMetricProducer, SolrRequestHandler, PermissionNameProvider

Direct Known Subclasses:

AnalysisRequestHandlerBase, BlobHandler, CollectionsHandler, ConfigSetsHandler, ContentStreamHandlerBase, CoreAdminHandler, DumpRequestHandler, FileFloatSource.ReloadCacheRequestHandler, GraphHandler, HealthCheckHandler, InfoHandler, LoggingHandler, LukeRequestHandler, MetricsCollectorHandler, MetricsHandler, MoreLikeThisHandler, NotFoundRequestHandler, PingRequestHandler, PluginInfoHandler, PropertiesRequestHandler, PublicKeyHandler, ReplicationHandler, SchemaHandler, SearchHandler, SecurityConfHandler, SegmentsInfoRequestHandler, ShowFileRequestHandler, SolrConfigHandler, SolrInfoMBeanHandler, StreamHandler, SystemInfoHandler, TaggerRequestHandler, TaskManagementHandler, ThreadDumpHandler, ZookeeperInfoHandler, ZookeeperStatusHandler

public abstract class RequestHandlerBase
extends Object
implements SolrRequestHandler, SolrInfoBean, NestedRequestHandler, ApiSupport, PermissionNameProvider

Base class for all request handlers.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RequestHandlerBase.HandlerMetrics	Metrics for this handler.

Nested classes/interfaces inherited from interface org.apache.solr.security.PermissionNameProvider

PermissionNameProvider.Name

Nested classes/interfaces inherited from interface org.apache.solr.core.SolrInfoBean

SolrInfoBean.Category, SolrInfoBean.Group

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	aggregateNodeLevelMetricsEnabled
protected org.apache.solr.common.params.SolrParams	appends
protected org.apache.solr.common.params.SolrParams	defaults
protected boolean	httpCaching
protected org.apache.solr.common.util.NamedList<?>	initArgs
protected org.apache.solr.common.params.SolrParams	invariants
protected RequestHandlerBase.HandlerMetrics	metrics
protected SolrMetricsContext	solrMetricsContext

Fields inherited from interface org.apache.solr.security.PermissionNameProvider

ANY, NULL, values

Fields inherited from interface org.apache.solr.request.SolrRequestHandler

TYPE

Constructor Summary

Constructors

Constructor	Description
RequestHandlerBase()

Method Summary

Modifier and Type	Method	Description
Collection<Api>	getApis()	Returns any (non-JAX-RS annotated) APIs associated with this request handler.
SolrInfoBean.Category	getCategory()	Category of this component
abstract String	getDescription()	Simple one or two line description
org.apache.solr.common.util.NamedList<?>	getInitArgs()
RequestHandlerBase.HandlerMetrics	getMetricsForThisRequest(SolrQueryRequest req)	The metrics to be used for this request.
String	getName()	Simple common usage name, e.g.
PluginInfo	getPluginInfo()
static SolrRequestHandler	getRequestHandler(String handlerName, PluginBag<SolrRequestHandler> reqHandlers)	Get the request handler registered to a given name.
SolrMetricsContext	getSolrMetricsContext()	Implementations should return the context used in SolrMetricProducer.initializeMetrics(SolrMetricsContext, String) to ensure proper cleanup of metrics at the end of the life-cycle of this component.
static org.apache.solr.common.params.SolrParams	getSolrParamsFromNamedList(org.apache.solr.common.util.NamedList<?> args, String key)
SolrRequestHandler	getSubHandler(String subPath)	Return a RequestHandler to handle a subpath from the path this handler is registered.
void	handleRequest(SolrQueryRequest req, SolrQueryResponse rsp)	Handles a query request, this method must be thread safe.
abstract void	handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp)
void	init(org.apache.solr.common.util.NamedList<?> args)	Initializes the SolrRequestHandler by creating three SolrParams named.
void	initializeMetrics(SolrMetricsContext parentContext, String scope)	Initialize metrics specific to this producer.
static boolean	isInternalShardRequest(SolrQueryRequest req)	Checks whether the given request is an internal request to a shard.
static void	processErrorMetricsOnException(Exception e, RequestHandlerBase.HandlerMetrics metrics)
static Exception	processReceivedException(SolrQueryRequest req, Exception e)	Processes and normalizes any exceptions that are received from the request handler.
void	setPluginInfo(PluginInfo pluginInfo)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.solr.api.ApiSupport

getJerseyResources, registerV1, registerV2

Methods inherited from interface org.apache.solr.security.PermissionNameProvider

getPermissionName

Methods inherited from interface org.apache.solr.metrics.SolrMetricProducer

close

Field Details

initArgs

protected org.apache.solr.common.util.NamedList<?> initArgs

defaults

protected org.apache.solr.common.params.SolrParams defaults

appends

protected org.apache.solr.common.params.SolrParams appends

invariants

protected org.apache.solr.common.params.SolrParams invariants

httpCaching

protected boolean httpCaching

aggregateNodeLevelMetricsEnabled

protected boolean aggregateNodeLevelMetricsEnabled

solrMetricsContext

protected SolrMetricsContext solrMetricsContext

metrics

protected RequestHandlerBase.HandlerMetrics metrics

Constructor Details

RequestHandlerBase

public RequestHandlerBase()

Method Details

init

public void init(org.apache.solr.common.util.NamedList<?> args)

Initializes the SolrRequestHandler by creating three SolrParams named.

table of parameters

Name	Description
defaults	Contains all of the named arguments contained within the list element named "defaults".
appends	Contains all of the named arguments contained within the list element named "appends".
invariants	Contains all of the named arguments contained within the list element named "invariants".

Example:

 <lst name="defaults">
 <str name="echoParams">explicit</str>
 <str name="qf">text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0</str>
 <str name="mm">2<-1 5<-2 6<90%</str>
 <str name="bq">incubationdate_dt:[* TO NOW/DAY-1MONTH]^2.2</str>
 </lst>
 <lst name="appends">
 <str name="fq">inStock:true</str>
 </lst>

 <lst name="invariants">
 <str name="facet.field">cat</str>
 <str name="facet.field">manu_exact</str>
 <str name="facet.query">price:[* TO 500]</str>
 <str name="facet.query">price:[500 TO *]</str>
 </lst>
 

Specified by:

init in interface SolrRequestHandler

Parameters:

args - The NamedList to initialize from

See Also:

• handleRequest(org.apache.solr.request.SolrQueryRequest, org.apache.solr.response.SolrQueryResponse)
• handleRequestBody(org.apache.solr.request.SolrQueryRequest, org.apache.solr.response.SolrQueryResponse)
• SolrPluginUtils.setDefaults(org.apache.solr.request.SolrQueryRequest, org.apache.solr.common.params.SolrParams, org.apache.solr.common.params.SolrParams, org.apache.solr.common.params.SolrParams)

• See also the example solrconfig.xml located in the Solr codebase (example/solr/conf).

getSolrMetricsContext

public SolrMetricsContext getSolrMetricsContext()

Description copied from interface: SolrMetricProducer

Implementations should return the context used in SolrMetricProducer.initializeMetrics(SolrMetricsContext, String) to ensure proper cleanup of metrics at the end of the life-cycle of this component. This should be the child context if one was created, or null if the parent context was used.

Specified by:

getSolrMetricsContext in interface SolrMetricProducer

initializeMetrics

public void initializeMetrics(SolrMetricsContext parentContext,
 String scope)

Description copied from interface: SolrMetricProducer

Initialize metrics specific to this producer.

Specified by:

initializeMetrics in interface SolrMetricProducer

Parameters:

parentContext - parent metrics context. If this component has the same life-cycle as the parent it can simply use the parent context, otherwise it should obtain a child context using SolrMetricsContext.getChildContext(Object) passing this as the child object.

scope - component scope

getSolrParamsFromNamedList

public static org.apache.solr.common.params.SolrParams getSolrParamsFromNamedList(org.apache.solr.common.util.NamedList<?> args,
 String key)

getInitArgs

public org.apache.solr.common.util.NamedList<?> getInitArgs()

handleRequestBody

public abstract void handleRequestBody(SolrQueryRequest req,
 SolrQueryResponse rsp)
                                throws Exception

Throws:

Exception

handleRequest

public void handleRequest(SolrQueryRequest req,
 SolrQueryResponse rsp)

Description copied from interface: SolrRequestHandler

Handles a query request, this method must be thread safe.

Information about the request may be obtained from req and response information may be set using rsp.

There are no mandatory actions that handleRequest must perform. An empty handleRequest implementation would fulfill all interface obligations.

Specified by:

handleRequest in interface SolrRequestHandler

processErrorMetricsOnException

public static void processErrorMetricsOnException(Exception e,
 RequestHandlerBase.HandlerMetrics metrics)

processReceivedException

public static Exception processReceivedException(SolrQueryRequest req,
 Exception e)

Processes and normalizes any exceptions that are received from the request handler. This method is called before any error metrics are recorded.

If a tragic exception occurred in the index writer, this method also gives up leadership of the shard, and replaces the index writer with a new one to attempt to get out of a transient failure (e.g. disk failure).

getMetricsForThisRequest

public RequestHandlerBase.HandlerMetrics getMetricsForThisRequest(SolrQueryRequest req)

The metrics to be used for this request.

getName

public String getName()

Description copied from interface: SolrInfoBean

Simple common usage name, e.g. BasicQueryHandler, or fully qualified class name.

Specified by:

getName in interface SolrInfoBean

getDescription

public abstract String getDescription()

Description copied from interface: SolrInfoBean

Simple one or two line description

Specified by:

getDescription in interface SolrInfoBean

getCategory

public SolrInfoBean.Category getCategory()

Description copied from interface: SolrInfoBean

Category of this component

Specified by:

getCategory in interface SolrInfoBean

getSubHandler

public SolrRequestHandler getSubHandler(String subPath)

Description copied from interface: NestedRequestHandler

Return a RequestHandler to handle a subpath from the path this handler is registered.

Specified by:

getSubHandler in interface NestedRequestHandler

getRequestHandler

public static SolrRequestHandler getRequestHandler(String handlerName,
 PluginBag<SolrRequestHandler> reqHandlers)

Get the request handler registered to a given name.

This function is thread safe.

setPluginInfo

public void setPluginInfo(PluginInfo pluginInfo)

getPluginInfo

public PluginInfo getPluginInfo()

getApis

public Collection<Api> getApis()

Description copied from interface: ApiSupport

Returns any (non-JAX-RS annotated) APIs associated with this request handler.

Specified by:

getApis in interface ApiSupport

See Also:

• ApiSupport.getJerseyResources()

isInternalShardRequest

public static boolean isInternalShardRequest(SolrQueryRequest req)

Checks whether the given request is an internal request to a shard. We rely on the fact that an internal search request to a shard contains the param "isShard", and an internal update request to a shard contains the param "distrib.from".

Returns:

true if request is internal