Package org.nustaq.offheap

Class FSTUTFStringOffheapMap<V>

java.lang.Object

org.nustaq.offheap.FSTBinaryOffheapMap

org.nustaq.offheap.FSTCodedOffheapMap<K,V>

org.nustaq.offheap.FSTSerializedOffheapMap<String,V>

org.nustaq.offheap.FSTUTFStringOffheapMap<V>

public class FSTUTFStringOffheapMap<V>
extends FSTSerializedOffheapMap<String,V>

Created by ruedi on 05/08/15.

Nested Class Summary

Nested classes/interfaces inherited from class org.nustaq.offheap.FSTBinaryOffheapMap

FSTBinaryOffheapMap.KeyValIter

Field Summary

Fields inherited from class org.nustaq.offheap.FSTSerializedOffheapMap

buffer, coder, tmpVal

Fields inherited from class org.nustaq.offheap.FSTBinaryOffheapMap

alloc, bytezOffset, CORE_HEADER_LEN, CUSTOM_FILEHEADER_LEN, customHeader, FILE_HEADER_LEN, freeList, GB, index, KEY_OFFSET_IN_HEADER, keyLen, mappedFile, MB, memory, mutationCount, numElem

Constructor Summary

Constructors

Constructor	Description
FSTUTFStringOffheapMap(int keyLen, long sizeMemBytes, int numberOfEleems)
FSTUTFStringOffheapMap(int keyLen, long sizeMemBytes, int numberOfEleems, FSTCoder coder)	see other mem constructor, additional allows to insert a coder.
FSTUTFStringOffheapMap(String file, int keylen, long size, int numelem)	create a memory mapped offheap hashmap
FSTUTFStringOffheapMap(String mappedFile, int keyLen, long sizeMemBytes, int numberOfElems, FSTCoder coder)	see other mem mapped file constructor + additional allows to insert a coder.

Method Summary

Modifier and Type	Method	Description
ByteSource	encodeKey(String key)

Methods inherited from class org.nustaq.offheap.FSTSerializedOffheapMap

decodeValue, encodeValue, getCoder, getEntryLengthForContentLength

Methods inherited from class org.nustaq.offheap.FSTCodedOffheapMap

get, put, remove, values

Methods inherited from class org.nustaq.offheap.FSTBinaryOffheapMap

addEntry, addToFreeList, binaryKeys, binaryValues, decElems, dumpIndexStats, finalize, free, getBinary, getCapacityMB, getContentLenFromHeader, getCustomFileHeader, getFileName, getFreeMem, getHeaderLen, getLenFromHeader, getSize, getUsedMem, incElems, init, initFromFile, main, printBinaryKey, putBinary, removeBinary, removeEntry, resizeStore, setEntry, writeEntryHeader

Methods inherited from class java.lang.Object

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

Constructor Details

FSTUTFStringOffheapMap

public FSTUTFStringOffheapMap(int keyLen,
 long sizeMemBytes,
 int numberOfEleems,
 FSTCoder coder)

see other mem constructor, additional allows to insert a coder. Useful to preregister classes (speed+size gain, no classnames written!). E.g. new DefaultCoder(MyValue.class, MyOtherValue.class, .. )

FSTUTFStringOffheapMap

public FSTUTFStringOffheapMap(int keyLen,
 long sizeMemBytes,
 int numberOfEleems)

Parameters:

keyLen - - maximum len of a key

sizeMemBytes - - size of memory (not bigger than OS heap

numberOfEleems - - estimation on number of key-value pairs (autogrow, just educated guess)

FSTUTFStringOffheapMap

public FSTUTFStringOffheapMap(String mappedFile,
 int keyLen,
 long sizeMemBytes,
 int numberOfElems,
 FSTCoder coder)
                       throws Exception

see other mem mapped file constructor + additional allows to insert a coder. Useful to preregister classes (speed+size gain, no classnames written!). E.g. new DefaultCoder(MyValue.class, MyOtherValue.class, .. )

Throws:

Exception

FSTUTFStringOffheapMap

public FSTUTFStringOffheapMap(String file,
 int keylen,
 long size,
 int numelem)
                       throws Exception

create a memory mapped offheap hashmap

Parameters:

file - - the file location. If file exists, it will be loaded Attention: in case classes changed you need to delete files as objects won't be compatible (except you made use of fst versioning features)

keylen - - the maximum len of a key

size - - max size of file (can be GB, check OS settings to avoid eager write-to-disk)

numelem - - estimated number of key-value pairs (will auto-grow, just educated guess)

Throws:

Exception

Method Details

encodeKey

public ByteSource encodeKey(String key)

Specified by:

encodeKey in class FSTCodedOffheapMap<String,V>