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/*
* COPIED FROM APACHE LUCENE 4.7.2
*
* Git URL: [email protected]:apache/lucene.git, tag: releases/lucene-solr/4.7.2, path: lucene/core/src/java
*
* (see https://issues.apache.org/jira/browse/OAK-10786 for details)
*/
package org.apache.lucene.search;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.io.PrintStream;
import org.apache.lucene.analysis.NumericTokenStream;
import org.apache.lucene.document.DoubleField;
import org.apache.lucene.document.FloatField;
import org.apache.lucene.document.IntField;
import org.apache.lucene.document.LongField;
import org.apache.lucene.document.NumericDocValuesField;
import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.BinaryDocValues;
import org.apache.lucene.index.DocTermOrds;
import org.apache.lucene.index.IndexReader; // javadocs
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.NumericUtils;
import org.apache.lucene.util.RamUsageEstimator;
/**
* Expert: Maintains caches of term values.
*
* Created: May 19, 2004 11:13:14 AM
*
* @since lucene 1.4
* @see org.apache.lucene.util.FieldCacheSanityChecker
*
* @lucene.internal
*/
public interface FieldCache {
/** Field values as 8-bit signed bytes */
public static abstract class Bytes {
/** Return a single Byte representation of this field's value. */
public abstract byte get(int docID);
/** Zero value for every document */
public static final Bytes EMPTY = new Bytes() {
@Override
public byte get(int docID) {
return 0;
}
};
}
/** Field values as 16-bit signed shorts */
public static abstract class Shorts {
/** Return a short representation of this field's value. */
public abstract short get(int docID);
/** Zero value for every document */
public static final Shorts EMPTY = new Shorts() {
@Override
public short get(int docID) {
return 0;
}
};
}
/** Field values as 32-bit signed integers */
public static abstract class Ints {
/** Return an integer representation of this field's value. */
public abstract int get(int docID);
/** Zero value for every document */
public static final Ints EMPTY = new Ints() {
@Override
public int get(int docID) {
return 0;
}
};
}
/** Field values as 64-bit signed long integers */
public static abstract class Longs {
/** Return an long representation of this field's value. */
public abstract long get(int docID);
/** Zero value for every document */
public static final Longs EMPTY = new Longs() {
@Override
public long get(int docID) {
return 0;
}
};
}
/** Field values as 32-bit floats */
public static abstract class Floats {
/** Return an float representation of this field's value. */
public abstract float get(int docID);
/** Zero value for every document */
public static final Floats EMPTY = new Floats() {
@Override
public float get(int docID) {
return 0;
}
};
}
/** Field values as 64-bit doubles */
public static abstract class Doubles {
/** Return an double representation of this field's value. */
public abstract double get(int docID);
/** Zero value for every document */
public static final Doubles EMPTY = new Doubles() {
@Override
public double get(int docID) {
return 0;
}
};
}
/**
* Placeholder indicating creation of this cache is currently in-progress.
*/
public static final class CreationPlaceholder {
Object value;
}
/**
* Marker interface as super-interface to all parsers. It
* is used to specify a custom parser to {@link
* SortField#SortField(String, FieldCache.Parser)}.
*/
public interface Parser {
/**
* Pulls a {@link TermsEnum} from the given {@link Terms}. This method allows certain parsers
* to filter the actual TermsEnum before the field cache is filled.
*
* @param terms the {@link Terms} instance to create the {@link TermsEnum} from.
* @return a possibly filtered {@link TermsEnum} instance, this method must not return null.
* @throws IOException if an {@link IOException} occurs
*/
public TermsEnum termsEnum(Terms terms) throws IOException;
}
/** Interface to parse bytes from document fields.
* @see FieldCache#getBytes(AtomicReader, String, FieldCache.ByteParser, boolean)
*/
@Deprecated
public interface ByteParser extends Parser {
/** Return a single Byte representation of this field's value. */
public byte parseByte(BytesRef term);
}
/** Interface to parse shorts from document fields.
* @see FieldCache#getShorts(AtomicReader, String, FieldCache.ShortParser, boolean)
*/
@Deprecated
public interface ShortParser extends Parser {
/** Return a short representation of this field's value. */
public short parseShort(BytesRef term);
}
/** Interface to parse ints from document fields.
* @see FieldCache#getInts(AtomicReader, String, FieldCache.IntParser, boolean)
*/
public interface IntParser extends Parser {
/** Return an integer representation of this field's value. */
public int parseInt(BytesRef term);
}
/** Interface to parse floats from document fields.
* @see FieldCache#getFloats(AtomicReader, String, FieldCache.FloatParser, boolean)
*/
public interface FloatParser extends Parser {
/** Return an float representation of this field's value. */
public float parseFloat(BytesRef term);
}
/** Interface to parse long from document fields.
* @see FieldCache#getLongs(AtomicReader, String, FieldCache.LongParser, boolean)
*/
public interface LongParser extends Parser {
/** Return an long representation of this field's value. */
public long parseLong(BytesRef term);
}
/** Interface to parse doubles from document fields.
* @see FieldCache#getDoubles(AtomicReader, String, FieldCache.DoubleParser, boolean)
*/
public interface DoubleParser extends Parser {
/** Return an double representation of this field's value. */
public double parseDouble(BytesRef term);
}
/** Expert: The cache used internally by sorting and range query classes. */
public static FieldCache DEFAULT = new FieldCacheImpl();
/** The default parser for byte values, which are encoded by {@link Byte#toString(byte)} */
@Deprecated
public static final ByteParser DEFAULT_BYTE_PARSER = new ByteParser() {
@Override
public byte parseByte(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// IntField, instead, which already decodes
// directly from byte[]
return Byte.parseByte(term.utf8ToString());
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_BYTE_PARSER";
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
};
/** The default parser for short values, which are encoded by {@link Short#toString(short)} */
@Deprecated
public static final ShortParser DEFAULT_SHORT_PARSER = new ShortParser() {
@Override
public short parseShort(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// IntField, instead, which already decodes
// directly from byte[]
return Short.parseShort(term.utf8ToString());
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_SHORT_PARSER";
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
};
/** The default parser for int values, which are encoded by {@link Integer#toString(int)} */
@Deprecated
public static final IntParser DEFAULT_INT_PARSER = new IntParser() {
@Override
public int parseInt(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// IntField, instead, which already decodes
// directly from byte[]
return Integer.parseInt(term.utf8ToString());
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_INT_PARSER";
}
};
/** The default parser for float values, which are encoded by {@link Float#toString(float)} */
@Deprecated
public static final FloatParser DEFAULT_FLOAT_PARSER = new FloatParser() {
@Override
public float parseFloat(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// FloatField, instead, which already decodes
// directly from byte[]
return Float.parseFloat(term.utf8ToString());
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_FLOAT_PARSER";
}
};
/** The default parser for long values, which are encoded by {@link Long#toString(long)} */
@Deprecated
public static final LongParser DEFAULT_LONG_PARSER = new LongParser() {
@Override
public long parseLong(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// LongField, instead, which already decodes
// directly from byte[]
return Long.parseLong(term.utf8ToString());
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_LONG_PARSER";
}
};
/** The default parser for double values, which are encoded by {@link Double#toString(double)} */
@Deprecated
public static final DoubleParser DEFAULT_DOUBLE_PARSER = new DoubleParser() {
@Override
public double parseDouble(BytesRef term) {
// TODO: would be far better to directly parse from
// UTF8 bytes... but really users should use
// DoubleField, instead, which already decodes
// directly from byte[]
return Double.parseDouble(term.utf8ToString());
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return terms.iterator(null);
}
@Override
public String toString() {
return FieldCache.class.getName()+".DEFAULT_DOUBLE_PARSER";
}
};
/**
* A parser instance for int values encoded by {@link NumericUtils}, e.g. when indexed
* via {@link IntField}/{@link NumericTokenStream}.
*/
public static final IntParser NUMERIC_UTILS_INT_PARSER=new IntParser(){
@Override
public int parseInt(BytesRef term) {
return NumericUtils.prefixCodedToInt(term);
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return NumericUtils.filterPrefixCodedInts(terms.iterator(null));
}
@Override
public String toString() {
return FieldCache.class.getName()+".NUMERIC_UTILS_INT_PARSER";
}
};
/**
* A parser instance for float values encoded with {@link NumericUtils}, e.g. when indexed
* via {@link FloatField}/{@link NumericTokenStream}.
*/
public static final FloatParser NUMERIC_UTILS_FLOAT_PARSER=new FloatParser(){
@Override
public float parseFloat(BytesRef term) {
return NumericUtils.sortableIntToFloat(NumericUtils.prefixCodedToInt(term));
}
@Override
public String toString() {
return FieldCache.class.getName()+".NUMERIC_UTILS_FLOAT_PARSER";
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return NumericUtils.filterPrefixCodedInts(terms.iterator(null));
}
};
/**
* A parser instance for long values encoded by {@link NumericUtils}, e.g. when indexed
* via {@link LongField}/{@link NumericTokenStream}.
*/
public static final LongParser NUMERIC_UTILS_LONG_PARSER = new LongParser(){
@Override
public long parseLong(BytesRef term) {
return NumericUtils.prefixCodedToLong(term);
}
@Override
public String toString() {
return FieldCache.class.getName()+".NUMERIC_UTILS_LONG_PARSER";
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return NumericUtils.filterPrefixCodedLongs(terms.iterator(null));
}
};
/**
* A parser instance for double values encoded with {@link NumericUtils}, e.g. when indexed
* via {@link DoubleField}/{@link NumericTokenStream}.
*/
public static final DoubleParser NUMERIC_UTILS_DOUBLE_PARSER = new DoubleParser(){
@Override
public double parseDouble(BytesRef term) {
return NumericUtils.sortableLongToDouble(NumericUtils.prefixCodedToLong(term));
}
@Override
public String toString() {
return FieldCache.class.getName()+".NUMERIC_UTILS_DOUBLE_PARSER";
}
@Override
public TermsEnum termsEnum(Terms terms) throws IOException {
return NumericUtils.filterPrefixCodedLongs(terms.iterator(null));
}
};
/** Checks the internal cache for an appropriate entry, and if none is found,
* reads the terms in field and returns a bit set at the size of
* reader.maxDoc(), with turned on bits for each docid that
* does have a value for this field.
*/
public Bits getDocsWithField(AtomicReader reader, String field) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none is
* found, reads the terms in field as a single byte and returns an array
* of size reader.maxDoc() of the value each document
* has in the given field.
* @param reader Used to get field values.
* @param field Which field contains the single byte values.
* @param setDocsWithField If true then {@link #getDocsWithField} will
* also be computed and stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
* @deprecated (4.4) Index as a numeric field using {@link IntField} and then use {@link #getInts(AtomicReader, String, boolean)} instead.
*/
@Deprecated
public Bytes getBytes(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none is found,
* reads the terms in field as bytes and returns an array of
* size reader.maxDoc() of the value each document has in the
* given field.
* @param reader Used to get field values.
* @param field Which field contains the bytes.
* @param parser Computes byte for string values.
* @param setDocsWithField If true then {@link #getDocsWithField} will
* also be computed and stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
* @deprecated (4.4) Index as a numeric field using {@link IntField} and then use {@link #getInts(AtomicReader, String, boolean)} instead.
*/
@Deprecated
public Bytes getBytes(AtomicReader reader, String field, ByteParser parser, boolean setDocsWithField) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none is
* found, reads the terms in field as shorts and returns an array
* of size reader.maxDoc() of the value each document
* has in the given field.
* @param reader Used to get field values.
* @param field Which field contains the shorts.
* @param setDocsWithField If true then {@link #getDocsWithField} will
* also be computed and stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
* @deprecated (4.4) Index as a numeric field using {@link IntField} and then use {@link #getInts(AtomicReader, String, boolean)} instead.
*/
@Deprecated
public Shorts getShorts (AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none is found,
* reads the terms in field as shorts and returns an array of
* size reader.maxDoc() of the value each document has in the
* given field.
* @param reader Used to get field values.
* @param field Which field contains the shorts.
* @param parser Computes short for string values.
* @param setDocsWithField If true then {@link #getDocsWithField} will
* also be computed and stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
* @deprecated (4.4) Index as a numeric field using {@link IntField} and then use {@link #getInts(AtomicReader, String, boolean)} instead.
*/
@Deprecated
public Shorts getShorts (AtomicReader reader, String field, ShortParser parser, boolean setDocsWithField) throws IOException;
/**
* Returns an {@link Ints} over the values found in documents in the given
* field.
*
* @see #getInts(AtomicReader, String, IntParser, boolean)
*/
public Ints getInts(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/**
* Returns an {@link Ints} over the values found in documents in the given
* field. If the field was indexed as {@link NumericDocValuesField}, it simply
* uses {@link AtomicReader#getNumericDocValues(String)} to read the values.
* Otherwise, it checks the internal cache for an appropriate entry, and if
* none is found, reads the terms in field as ints and returns
* an array of size reader.maxDoc() of the value each document
* has in the given field.
*
* @param reader
* Used to get field values.
* @param field
* Which field contains the longs.
* @param parser
* Computes int for string values. May be {@code null} if the
* requested field was indexed as {@link NumericDocValuesField} or
* {@link IntField}.
* @param setDocsWithField
* If true then {@link #getDocsWithField} will also be computed and
* stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException
* If any error occurs.
*/
public Ints getInts(AtomicReader reader, String field, IntParser parser, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Floats} over the values found in documents in the given
* field.
*
* @see #getFloats(AtomicReader, String, FloatParser, boolean)
*/
public Floats getFloats(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Floats} over the values found in documents in the given
* field. If the field was indexed as {@link NumericDocValuesField}, it simply
* uses {@link AtomicReader#getNumericDocValues(String)} to read the values.
* Otherwise, it checks the internal cache for an appropriate entry, and if
* none is found, reads the terms in field as floats and returns
* an array of size reader.maxDoc() of the value each document
* has in the given field.
*
* @param reader
* Used to get field values.
* @param field
* Which field contains the floats.
* @param parser
* Computes float for string values. May be {@code null} if the
* requested field was indexed as {@link NumericDocValuesField} or
* {@link FloatField}.
* @param setDocsWithField
* If true then {@link #getDocsWithField} will also be computed and
* stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException
* If any error occurs.
*/
public Floats getFloats(AtomicReader reader, String field, FloatParser parser, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Longs} over the values found in documents in the given
* field.
*
* @see #getLongs(AtomicReader, String, LongParser, boolean)
*/
public Longs getLongs(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Longs} over the values found in documents in the given
* field. If the field was indexed as {@link NumericDocValuesField}, it simply
* uses {@link AtomicReader#getNumericDocValues(String)} to read the values.
* Otherwise, it checks the internal cache for an appropriate entry, and if
* none is found, reads the terms in field as longs and returns
* an array of size reader.maxDoc() of the value each document
* has in the given field.
*
* @param reader
* Used to get field values.
* @param field
* Which field contains the longs.
* @param parser
* Computes long for string values. May be {@code null} if the
* requested field was indexed as {@link NumericDocValuesField} or
* {@link LongField}.
* @param setDocsWithField
* If true then {@link #getDocsWithField} will also be computed and
* stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException
* If any error occurs.
*/
public Longs getLongs(AtomicReader reader, String field, LongParser parser, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Doubles} over the values found in documents in the given
* field.
*
* @see #getDoubles(AtomicReader, String, DoubleParser, boolean)
*/
public Doubles getDoubles(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/**
* Returns a {@link Doubles} over the values found in documents in the given
* field. If the field was indexed as {@link NumericDocValuesField}, it simply
* uses {@link AtomicReader#getNumericDocValues(String)} to read the values.
* Otherwise, it checks the internal cache for an appropriate entry, and if
* none is found, reads the terms in field as doubles and returns
* an array of size reader.maxDoc() of the value each document
* has in the given field.
*
* @param reader
* Used to get field values.
* @param field
* Which field contains the longs.
* @param parser
* Computes double for string values. May be {@code null} if the
* requested field was indexed as {@link NumericDocValuesField} or
* {@link DoubleField}.
* @param setDocsWithField
* If true then {@link #getDocsWithField} will also be computed and
* stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException
* If any error occurs.
*/
public Doubles getDoubles(AtomicReader reader, String field, DoubleParser parser, boolean setDocsWithField) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none
* is found, reads the term values in field
* and returns a {@link BinaryDocValues} instance, providing a
* method to retrieve the term (as a BytesRef) per document.
* @param reader Used to get field values.
* @param field Which field contains the strings.
* @param setDocsWithField If true then {@link #getDocsWithField} will
* also be computed and stored in the FieldCache.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
*/
public BinaryDocValues getTerms(AtomicReader reader, String field, boolean setDocsWithField) throws IOException;
/** Expert: just like {@link #getTerms(AtomicReader,String,boolean)},
* but you can specify whether more RAM should be consumed in exchange for
* faster lookups (default is "true"). Note that the
* first call for a given reader and field "wins",
* subsequent calls will share the same cache entry. */
public BinaryDocValues getTerms(AtomicReader reader, String field, boolean setDocsWithField, float acceptableOverheadRatio) throws IOException;
/** Checks the internal cache for an appropriate entry, and if none
* is found, reads the term values in field
* and returns a {@link SortedDocValues} instance,
* providing methods to retrieve sort ordinals and terms
* (as a ByteRef) per document.
* @param reader Used to get field values.
* @param field Which field contains the strings.
* @return The values in the given field for each document.
* @throws IOException If any error occurs.
*/
public SortedDocValues getTermsIndex(AtomicReader reader, String field) throws IOException;
/** Expert: just like {@link
* #getTermsIndex(AtomicReader,String)}, but you can specify
* whether more RAM should be consumed in exchange for
* faster lookups (default is "true"). Note that the
* first call for a given reader and field "wins",
* subsequent calls will share the same cache entry. */
public SortedDocValues getTermsIndex(AtomicReader reader, String field, float acceptableOverheadRatio) throws IOException;
/**
* Checks the internal cache for an appropriate entry, and if none is found, reads the term values
* in field and returns a {@link DocTermOrds} instance, providing a method to retrieve
* the terms (as ords) per document.
*
* @param reader Used to build a {@link DocTermOrds} instance
* @param field Which field contains the strings.
* @return a {@link DocTermOrds} instance
* @throws IOException If any error occurs.
*/
public SortedSetDocValues getDocTermOrds(AtomicReader reader, String field) throws IOException;
/**
* EXPERT: A unique Identifier/Description for each item in the FieldCache.
* Can be useful for logging/debugging.
* @lucene.experimental
*/
public final class CacheEntry {
private final Object readerKey;
private final String fieldName;
private final Class cacheType;
private final Object custom;
private final Object value;
private String size;
public CacheEntry(Object readerKey, String fieldName,
Class cacheType,
Object custom,
Object value) {
this.readerKey = readerKey;
this.fieldName = fieldName;
this.cacheType = cacheType;
this.custom = custom;
this.value = value;
}
public Object getReaderKey() {
return readerKey;
}
public String getFieldName() {
return fieldName;
}
public Class getCacheType() {
return cacheType;
}
public Object getCustom() {
return custom;
}
public Object getValue() {
return value;
}
/**
* Computes (and stores) the estimated size of the cache Value
* @see #getEstimatedSize
*/
public void estimateSize() {
long bytesUsed = RamUsageEstimator.sizeOf(getValue());
size = RamUsageEstimator.humanReadableUnits(bytesUsed);
}
/**
* The most recently estimated size of the value, null unless
* estimateSize has been called.
*/
public String getEstimatedSize() {
return size;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
b.append("'").append(getReaderKey()).append("'=>");
b.append("'").append(getFieldName()).append("',");
b.append(getCacheType()).append(",").append(getCustom());
b.append("=>").append(getValue().getClass().getName()).append("#");
b.append(System.identityHashCode(getValue()));
String s = getEstimatedSize();
if(null != s) {
b.append(" (size =~ ").append(s).append(')');
}
return b.toString();
}
}
/**
* EXPERT: Generates an array of CacheEntry objects representing all items
* currently in the FieldCache.
*
* NOTE: These CacheEntry objects maintain a strong reference to the
* Cached Values. Maintaining references to a CacheEntry the AtomicIndexReader
* associated with it has garbage collected will prevent the Value itself
* from being garbage collected when the Cache drops the WeakReference.
*
* @lucene.experimental
*/
public CacheEntry[] getCacheEntries();
/**
*
* EXPERT: Instructs the FieldCache to forcibly expunge all entries
* from the underlying caches. This is intended only to be used for
* test methods as a way to ensure a known base state of the Cache
* (with out needing to rely on GC to free WeakReferences).
* It should not be relied on for "Cache maintenance" in general
* application code.
*
* @lucene.experimental
*/
public void purgeAllCaches();
/**
* Expert: drops all cache entries associated with this
* reader {@link IndexReader#getCoreCacheKey}. NOTE: this cache key must
* precisely match the reader that the cache entry is
* keyed on. If you pass a top-level reader, it usually
* will have no effect as Lucene now caches at the segment
* reader level.
*/
public void purgeByCacheKey(Object coreCacheKey);
/**
* If non-null, FieldCacheImpl will warn whenever
* entries are created that are not sane according to
* {@link org.apache.lucene.util.FieldCacheSanityChecker}.
*/
public void setInfoStream(PrintStream stream);
/** counterpart of {@link #setInfoStream(PrintStream)} */
public PrintStream getInfoStream();
}