org.apache.accumulo.core.file.blockfile.impl
Class CachableBlockFile.Reader

java.lang.Object
  org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile.Reader

All Implemented Interfaces:

BlockFileReader

Enclosing class:

CachableBlockFile

public static class CachableBlockFile.Reader
extends java.lang.Object
implements BlockFileReader

Class wraps the BCFile reader.

Constructor Summary

CachableBlockFile.Reader(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path dataFile, org.apache.hadoop.conf.Configuration conf, BlockCache data, BlockCache index)

CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin, long len, org.apache.hadoop.conf.Configuration conf)

Method Summary

void	close()
long	getBlockCount()
CachableBlockFile.BlockRead	getDataBlock(int blockIndex) It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class.
CachableBlockFile.BlockRead	getMetaBlock(java.lang.String blockName) It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachableBlockFile.Reader

public CachableBlockFile.Reader(org.apache.hadoop.fs.FileSystem fs,
                                org.apache.hadoop.fs.Path dataFile,
                                org.apache.hadoop.conf.Configuration conf,
                                BlockCache data,
                                BlockCache index)
                         throws java.io.IOException

Throws:

java.io.IOException

CachableBlockFile.Reader

public CachableBlockFile.Reader(org.apache.hadoop.fs.FSDataInputStream fsin,
                                long len,
                                org.apache.hadoop.conf.Configuration conf)
                         throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getMetaBlock

public CachableBlockFile.BlockRead getMetaBlock(java.lang.String blockName)
                                         throws java.io.IOException

It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class. NOTE: In the case of multi-read threads: This method can do redundant work where an entry is read from disk and other threads check the cache before it has been inserted.

Specified by:

getMetaBlock in interface BlockFileReader

Throws:

java.io.IOException

getDataBlock

public CachableBlockFile.BlockRead getDataBlock(int blockIndex)
                                         throws java.io.IOException

It is intended that once the BlockRead object is returned to the caller, that the caller will read the entire block and then call close on the BlockRead class. NOTE: In the case of multi-read threads: This method can do redundant work where an entry is read from disk and other threads check the cache before it has been inserted.

Specified by:

getDataBlock in interface BlockFileReader

Throws:

java.io.IOException

getBlockCount

public long getBlockCount()

close

public void close()
           throws java.io.IOException

Specified by:

close in interface BlockFileReader

Throws:

java.io.IOException