com.exalead.papi.helper

Class DataPersist

java.lang.Object

com.exalead.papi.helper.DataPersist

Direct Known Subclasses:

BlobMemoize, ClobMemoize

public class DataPersist
extends java.lang.Object

A Proxy for an SQL BLOBL, CLOB, NCLOB, ... that stores the value until this instance is reclaimed. It make possible to query the content of the same blob several times, what is not possible with some JDBC drivers (Oracle) and may happen becuase of the processors. Small entries are persisted to RAM, large entries are copied back to the disk, which may cause some problem if the process is terminated uncleanly.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DataPersist.ReadAtMostInputStream An InputStream that reads at most a given number of bytes
static class	DataPersist.ReadAtMostReader

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	hasBeenFred
protected static int	LARGE_BLOB
protected long	length
protected java.io.File	tmpFile

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DataPersist(long length)

Method Summary

Modifier and Type	Method and Description
static byte[]	copyToByteArray(java.io.InputStream ins, int length)
protected void	finalize()
void	free()
long	length()

Methods inherited from class java.lang.Object

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

Field Detail

LARGE_BLOB

protected static final int LARGE_BLOB

See Also:

Constant Field Values

length

protected final long length

tmpFile

protected java.io.File tmpFile

hasBeenFred

protected boolean hasBeenFred

Constructor Detail

DataPersist

protected DataPersist(long length)

Method Detail

free

public void free()
          throws java.sql.SQLException

Throws:

java.sql.SQLException

length

public long length()
            throws java.sql.SQLException

Throws:

java.sql.SQLException

finalize

protected void finalize()

Overrides:

finalize in class java.lang.Object

copyToByteArray

public static byte[] copyToByteArray(java.io.InputStream ins,
                                     int length)
                              throws java.io.IOException

Throws:

java.io.IOException