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A first insertion of space filling curve settings into layout/key
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82 changes: 82 additions & 0 deletions
82
...rg/neo4j/kernel/impl/index/schema/config/IndexSpecificSpaceFillingCurveSettingsCache.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package org.neo4j.kernel.impl.index.schema.config; | ||
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| import java.util.Map; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.ConcurrentMap; | ||
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| import org.neo4j.gis.spatial.index.curves.SpaceFillingCurve; | ||
| import org.neo4j.kernel.configuration.Config; | ||
| import org.neo4j.values.storable.CoordinateReferenceSystem; | ||
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| /** | ||
| * A combination of {@link ConfiguredSpaceFillingCurveSettingsCache}, which contains all settings from {@link Config}, | ||
| * but also settings for a specific index. Settings for a specific index can change over time as new {@link CoordinateReferenceSystem} | ||
| * are used in this index. | ||
| */ | ||
| public class IndexSpecificSpaceFillingCurveSettingsCache | ||
| { | ||
| private final ConfiguredSpaceFillingCurveSettingsCache globalConfigCache; | ||
| private final ConcurrentMap<CoordinateReferenceSystem,SpaceFillingCurveSettings> indexConfigCache = new ConcurrentHashMap<>(); | ||
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| public IndexSpecificSpaceFillingCurveSettingsCache( | ||
| ConfiguredSpaceFillingCurveSettingsCache globalConfigCache, | ||
| Map<CoordinateReferenceSystem,SpaceFillingCurveSettings> indexConfigCache ) | ||
| { | ||
| this.globalConfigCache = globalConfigCache; | ||
| this.indexConfigCache.putAll( indexConfigCache ); | ||
| } | ||
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| /** | ||
| * Gets {@link SpaceFillingCurve} for a particular coordinate reference system's crsTableId and code point. | ||
| * | ||
| * @param crsTableId table id of the {@link CoordinateReferenceSystem}. | ||
| * @param crsCodePoint code of the {@link CoordinateReferenceSystem}. | ||
| * @param assignToIndexIfNotYetAssigned whether or not to make a snapshot of this setting index-specific if this is the | ||
| * first time it's accessed for this index. It will then show up in {@link #visitIndexSpecificSettings(SettingVisitor)}. | ||
| * @return the {@link SpaceFillingCurve} for the given coordinate reference system. | ||
| */ | ||
| public SpaceFillingCurve forCrs( int crsTableId, int crsCodePoint, boolean assignToIndexIfNotYetAssigned ) | ||
| { | ||
| CoordinateReferenceSystem crs = CoordinateReferenceSystem.get( crsTableId, crsCodePoint ); | ||
|
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| // Index-specific | ||
| SpaceFillingCurveSettings specificSetting = indexConfigCache.get( crs ); | ||
| if ( specificSetting != null ) | ||
| { | ||
| return specificSetting.curve(); | ||
| } | ||
|
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| // Global config | ||
| SpaceFillingCurveSettings configuredSetting = fromConfig( crs ); | ||
| if ( assignToIndexIfNotYetAssigned ) | ||
| { | ||
| indexConfigCache.put( crs, configuredSetting ); | ||
| } | ||
| return configuredSetting.curve(); | ||
| } | ||
|
|
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| /** | ||
| * Mostly for checkpoints to serialize index-specific settings into the index header. | ||
| */ | ||
| public void visitIndexSpecificSettings( SettingVisitor visitor ) | ||
| { | ||
| indexConfigCache.forEach( (crs, settings) -> visitor.visit( crs, settings ) ); | ||
| } | ||
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| private SpaceFillingCurveSettings fromConfig( CoordinateReferenceSystem crs ) | ||
| { | ||
| SpaceFillingCurveSettings global = globalConfigCache.forCRS( crs ); | ||
| if ( global != null ) | ||
| { | ||
| return global; | ||
| } | ||
|
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| // Fall back to creating one (TODO cache this?) | ||
| return SpaceFillingCurveSettingsFactory.fromConfig( globalConfigCache.getMaxBits(), new EnvelopeSettings( crs ) ); | ||
| } | ||
|
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| public interface SettingVisitor | ||
| { | ||
| void visit( CoordinateReferenceSystem crs, SpaceFillingCurveSettings settings ); | ||
| } | ||
| } |
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