Package org.apache.lucene.search
Class LiveFieldValues<S,T>
- java.lang.Object
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- org.apache.lucene.search.LiveFieldValues<S,T>
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- All Implemented Interfaces:
Closeable,AutoCloseable,ReferenceManager.RefreshListener
public abstract class LiveFieldValues<S,T> extends Object implements ReferenceManager.RefreshListener, Closeable
Tracks live field values across NRT reader reopens. This holds a map for all updated ids since the last reader reopen. Once the NRT reader is reopened, it prunes the map. This means you must reopen your NRT reader periodically otherwise the RAM consumption of this class will grow unbounded!NOTE: you must ensure the same id is never updated at the same time by two threads, because in this case you cannot in general know which thread "won".
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Constructor Summary
Constructors Constructor Description LiveFieldValues(ReferenceManager<S> mgr, T missingValue)The missingValue must be non-null.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description voidadd(String id, T value)Call this after you've successfully added a document to the index, to record what value you just set the field to.voidafterRefresh(boolean didRefresh)Called after the attempted refresh; if the refresh did open a new reference then didRefresh will be true andReferenceManager.acquire()is guaranteed to return the new reference.voidbeforeRefresh()Called right before a refresh attempt starts.voidclose()voiddelete(String id)Call this after you've successfully deleted a document from the index.Tget(String id)Returns the current value for this id, or null if the id isn't in the index or was deleted.protected abstract TlookupFromSearcher(S s, String id)This is called when the id/value was already flushed and opened in an NRT IndexSearcher.intsize()Returns the [approximate] number of id/value pairs buffered in RAM.
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Constructor Detail
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LiveFieldValues
public LiveFieldValues(ReferenceManager<S> mgr, T missingValue)
The missingValue must be non-null.
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Method Detail
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close
public void close()
- Specified by:
closein interfaceAutoCloseable- Specified by:
closein interfaceCloseable
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beforeRefresh
public void beforeRefresh() throws IOExceptionDescription copied from interface:ReferenceManager.RefreshListenerCalled right before a refresh attempt starts.- Specified by:
beforeRefreshin interfaceReferenceManager.RefreshListener- Throws:
IOException
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afterRefresh
public void afterRefresh(boolean didRefresh) throws IOExceptionDescription copied from interface:ReferenceManager.RefreshListenerCalled after the attempted refresh; if the refresh did open a new reference then didRefresh will be true andReferenceManager.acquire()is guaranteed to return the new reference.- Specified by:
afterRefreshin interfaceReferenceManager.RefreshListener- Throws:
IOException
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add
public void add(String id, T value)
Call this after you've successfully added a document to the index, to record what value you just set the field to.
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delete
public void delete(String id)
Call this after you've successfully deleted a document from the index.
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size
public int size()
Returns the [approximate] number of id/value pairs buffered in RAM.
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get
public T get(String id) throws IOException
Returns the current value for this id, or null if the id isn't in the index or was deleted.- Throws:
IOException
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lookupFromSearcher
protected abstract T lookupFromSearcher(S s, String id) throws IOException
This is called when the id/value was already flushed and opened in an NRT IndexSearcher. You must implement this to go look up the value (eg, via doc values, field cache, stored fields, etc.).- Throws:
IOException
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