anon.client
Class ChannelTable

java.lang.Object
  anon.client.ChannelTable

All Implemented Interfaces:

IDataChannelCreator

public class ChannelTable
extends java.lang.Object
implements IDataChannelCreator

Author:

Stefan Lieske

Field Summary

static int	CONTROL_CHANNEL_ID_DUMMY
static int	CONTROL_CHANNEL_ID_PAY
static int	CONTROL_CHANNEL_ID_REPLAY
static int	CONTROL_CHANNEL_ID_TEST
private int	m_availableDataChannels
private java.security.SecureRandom	m_channelIdGenerator
private java.util.Hashtable	m_channelTable
private IDataChannelFactory	m_dataChannelFactory
private boolean	m_tableClosed
private static int	MAX_OPEN_DATACHANNELS
private static int	MAX_RESERVED_CHANNEL_ID The maximum Channel-ID in the reserved area for ControlChannels (those Channel-IDs are not available for DataChannels).
private static int	MIN_RESERVED_CHANNEL_ID The minimum Channel-ID in the reserved area for ControlChannels (those Channel-IDs are not available for DataChannels).

Constructor Summary

ChannelTable(IDataChannelFactory a_dataChannelFactory, java.security.SecureRandom a_channelIdGenerator)

Method Summary

void	closeChannelTable()
AbstractDataChannel	createDataChannel(AbstractDataChain a_parentDataChain)
AbstractChannel	getChannel(int a_channelId)
private int	getFreeChannelId() Returns an available DataChannel-ID.
boolean	isControlChannelId(int a_channelId)
void	registerControlChannel(int a_channelId, AbstractControlChannel a_controlChannel)
void	removeChannel(int a_channelId)

Methods inherited from class java.lang.Object

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

Field Detail

CONTROL_CHANNEL_ID_PAY

public static final int CONTROL_CHANNEL_ID_PAY

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Constant Field Values

CONTROL_CHANNEL_ID_REPLAY

public static final int CONTROL_CHANNEL_ID_REPLAY

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Constant Field Values

CONTROL_CHANNEL_ID_DUMMY

public static final int CONTROL_CHANNEL_ID_DUMMY

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Constant Field Values

CONTROL_CHANNEL_ID_TEST

public static final int CONTROL_CHANNEL_ID_TEST

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Constant Field Values

MAX_OPEN_DATACHANNELS

private static final int MAX_OPEN_DATACHANNELS

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Constant Field Values

MIN_RESERVED_CHANNEL_ID

private static final int MIN_RESERVED_CHANNEL_ID

The minimum Channel-ID in the reserved area for ControlChannels (those Channel-IDs are not available for DataChannels). Attention: ChannelID 0 is also not available for ControlChannels (it is used mix-internal for filling the pool with dummies, if no real packet is received).

See Also:

Constant Field Values

MAX_RESERVED_CHANNEL_ID

private static final int MAX_RESERVED_CHANNEL_ID

The maximum Channel-ID in the reserved area for ControlChannels (those Channel-IDs are not available for DataChannels).

See Also:

Constant Field Values

m_dataChannelFactory

private IDataChannelFactory m_dataChannelFactory

m_channelTable

private java.util.Hashtable m_channelTable

m_availableDataChannels

private volatile int m_availableDataChannels

m_channelIdGenerator

private java.security.SecureRandom m_channelIdGenerator

m_tableClosed

private volatile boolean m_tableClosed

Constructor Detail

ChannelTable

public ChannelTable(IDataChannelFactory a_dataChannelFactory,
                    java.security.SecureRandom a_channelIdGenerator)

Method Detail

getChannel

public AbstractChannel getChannel(int a_channelId)

removeChannel

public void removeChannel(int a_channelId)

registerControlChannel

public void registerControlChannel(int a_channelId,
                                   AbstractControlChannel a_controlChannel)

isControlChannelId

public boolean isControlChannelId(int a_channelId)

createDataChannel

public AbstractDataChannel createDataChannel(AbstractDataChain a_parentDataChain)

Specified by:

createDataChannel in interface IDataChannelCreator

closeChannelTable

public void closeChannelTable()

getFreeChannelId

private int getFreeChannelId()

Returns an available DataChannel-ID. The returned value is an ID which is not in the reserved area for control-channels and also not already in use by a datachannel. The returned ID can be negative because the mix simply expects a 32 bit value (unsigned). Synchronization with the channel-table has to be done by the caller.

Returns:

An available DataChannel-ID (maybe negative).