com.db4o.io

Class MemoryIoAdapter

java.lang.Object

com.db4o.io.IoAdapter

com.db4o.io.MemoryIoAdapter

Deprecated.

use Storage-equivalent instead.

public class MemoryIoAdapter
extends IoAdapter

IoAdapter for in-memory operation.

Configure db4o to operate with this in-memory IoAdapter with MemoryIoAdapter memoryIoAdapter = new MemoryIoAdapter();
Db4o.configure().io(memoryIoAdapter);


Use the normal #openFile() and #openServer() commands to open ObjectContainers and ObjectServers. The names specified as file names will be used to identify the byte[] content of the in-memory files in the _memoryFiles Hashtable in the adapter. After working with an in-memory ObjectContainer/ObjectServer the byte[] content is available in the MemoryIoAdapter by using get(String). To add old existing database byte[] content to a MemoryIoAdapter use put(String, byte[]). To reduce memory consumption of memory file names that will no longer be used call put(String, byte[]) and pass an empty byte array.

Constructor Summary

Constructors

Constructor and Description
MemoryIoAdapter() Deprecated.
MemoryIoAdapter(int initialLength) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Deprecated. for internal processing only.
void	delete(java.lang.String path) Deprecated.
boolean	exists(java.lang.String path) Deprecated. for internal processing only.
byte[]	get(java.lang.String name) Deprecated. returns the content bytes for a database with the given name.
long	getLength() Deprecated. for internal processing only.
void	growBy(int length) Deprecated. configures the length a memory file should grow, if no more free slots are found within.
IoAdapter	open(java.lang.String path, boolean lockFile, long initialLength, boolean readOnly) Deprecated. for internal processing only.
void	put(java.lang.String name, byte[] bytes) Deprecated. creates an in-memory database with the passed content bytes and adds it to the adapter for the specified name.
int	read(byte[] bytes, int length) Deprecated. for internal processing only.
void	seek(long pos) Deprecated. for internal processing only.
void	sync() Deprecated. for internal processing only.
void	write(byte[] buffer, int length) Deprecated. for internal processing only.

Methods inherited from class com.db4o.io.IoAdapter

blockCopy, blockSeek, blockSeek, blockSize, blockSize, copy, delegatedIoAdapter, read, regularAddress, write

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryIoAdapter

public MemoryIoAdapter()

Deprecated.

MemoryIoAdapter

public MemoryIoAdapter(int initialLength)

Deprecated.

Method Detail

put

public void put(java.lang.String name,
       byte[] bytes)

Deprecated.

creates an in-memory database with the passed content bytes and adds it to the adapter for the specified name.

Parameters:

name - the name to be use for #openFile() or #openServer() calls

bytes - the database content

get

public byte[] get(java.lang.String name)

Deprecated.

returns the content bytes for a database with the given name.

Parameters:

name - the name to be use for #openFile() or #openServer() calls

Returns:

the content bytes

growBy

public void growBy(int length)

Deprecated.

configures the length a memory file should grow, if no more free slots are found within.

Specify a large value (100,000 or more) for best performance. Specify a small value (100) for the smallest memory consumption. The default setting is 10,000.

Parameters:

length - the length in bytes

close

public void close()
           throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

close in class IoAdapter

Throws:

Db4oIOException

delete

public void delete(java.lang.String path)

Deprecated.

Specified by:

delete in class IoAdapter

exists

public boolean exists(java.lang.String path)

Deprecated.

for internal processing only.

Specified by:

exists in class IoAdapter

getLength

public long getLength()
               throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

getLength in class IoAdapter

Throws:

Db4oIOException

open

public IoAdapter open(java.lang.String path,
             boolean lockFile,
             long initialLength,
             boolean readOnly)
               throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

open in class IoAdapter

Throws:

Db4oIOException

read

public int read(byte[] bytes,
       int length)
         throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

read in class IoAdapter

Throws:

Db4oIOException

seek

public void seek(long pos)
          throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

seek in class IoAdapter

Throws:

Db4oIOException

sync

public void sync()
          throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

sync in class IoAdapter

Throws:

Db4oIOException

write

public void write(byte[] buffer,
         int length)
           throws Db4oIOException

Deprecated.

for internal processing only.

Specified by:

write in class IoAdapter

Throws:

Db4oIOException