org.apache.solr.handler.component

Interface MergeStrategy

public interface MergeStrategy

The MergeStrategy class defines custom merge logic for distributed searches. Note: This API is experimental and may change in non backward-compatible ways in the future

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator	MERGE_COMP

Method Summary

Methods

Modifier and Type	Method and Description
int	getCost() Defines the order that the mergeStrategies are applied.
void	handleMergeFields(ResponseBuilder rb, SolrIndexSearcher searcher) Implement handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher) if your merge strategy needs more complex data then the sort fields provide.
boolean	handlesMergeFields() handlesMergeFields must return true if the MergeStrategy implements a custom handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher)
void	merge(ResponseBuilder rb, ShardRequest sreq) merge defines the merging behaving of results that are collected from the shards during a distributed search.
boolean	mergesIds() mergesIds must return true if the merge method merges document ids from the shards.

Field Detail

MERGE_COMP

static final Comparator MERGE_COMP

Method Detail

merge

void merge(ResponseBuilder rb,
         ShardRequest sreq)

merge defines the merging behaving of results that are collected from the shards during a distributed search.

mergesIds

boolean mergesIds()

mergesIds must return true if the merge method merges document ids from the shards. If it merges other output from the shards it must return false.

handlesMergeFields

boolean handlesMergeFields()

handlesMergeFields must return true if the MergeStrategy implements a custom handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher)

handleMergeFields

void handleMergeFields(ResponseBuilder rb,
                     SolrIndexSearcher searcher)
                       throws IOException

Implement handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher) if your merge strategy needs more complex data then the sort fields provide.

Throws:

IOException

getCost

int getCost()

Defines the order that the mergeStrategies are applied. Lower costs are applied first.