org.apache.catalina.tribes.io
Class ChannelData

java.lang.Object
  org.apache.catalina.tribes.io.ChannelData

All Implemented Interfaces:

java.io.Serializable, ChannelMessage

public class ChannelData
extends java.lang.Object
implements ChannelMessage

The ChannelData object is used to transfer a message through the channel interceptor stack and eventually out on a transport to be sent to another node. While the message is being processed by the different interceptors, the message data can be manipulated as each interceptor seems appropriate.

Author:

Peter Rossbach, Filip Hanik

See Also:

Serialized Form

EMPTY_DATA_ARRAY

public static ChannelData[] EMPTY_DATA_ARRAY

USE_SECURE_RANDOM_FOR_UUID

public static boolean USE_SECURE_RANDOM_FOR_UUID

ChannelData

public ChannelData()

Creates an empty channel data with a new unique Id

See Also:

ChannelData(boolean)

ChannelData

public ChannelData(boolean generateUUID)

Create an empty channel data object

Parameters:

generateUUID - boolean - if true, a unique Id will be generated

ChannelData

public ChannelData(byte[] uniqueId,
                   XByteBuffer message,
                   long timestamp)

Creates a new channel data object with data

Parameters:

uniqueId - - unique message id

message - - message data

timestamp - - message timestamp

getMessage

public XByteBuffer getMessage()

Description copied from interface: ChannelMessage

returns the byte buffer that contains the actual message payload

Specified by:

getMessage in interface ChannelMessage

Returns:

Returns the message byte buffer

setMessage

public void setMessage(XByteBuffer message)

Description copied from interface: ChannelMessage

The byte buffer that contains the actual message payload

Specified by:

setMessage in interface ChannelMessage

Parameters:

message - The message to send.

getTimestamp

public long getTimestamp()

Description copied from interface: ChannelMessage

Timestamp of when the message was created.

Specified by:

getTimestamp in interface ChannelMessage

Returns:

Returns the timestamp.

setTimestamp

public void setTimestamp(long timestamp)

Description copied from interface: ChannelMessage

Sets the timestamp of this message

Specified by:

setTimestamp in interface ChannelMessage

Parameters:

timestamp - The timestamp to send

getUniqueId

public byte[] getUniqueId()

Description copied from interface: ChannelMessage

Each message must have a globally unique Id. interceptors heavily depend on this id for message processing

Specified by:

getUniqueId in interface ChannelMessage

Returns:

Returns the uniqueId.

setUniqueId

public void setUniqueId(byte[] uniqueId)

Parameters:

uniqueId - The uniqueId to send.

getOptions

public int getOptions()

Description copied from interface: ChannelMessage

The message options is a 32 bit flag set that triggers interceptors and message behavior.

Specified by:

getOptions in interface ChannelMessage

Returns:

returns the message options see org.apache.catalina.tribes.Channel#sendMessage(org.apache.catalina.tribes.Member[], java.io.Serializable, int)

See Also:

Channel.send(Member[], Serializable, int), ChannelInterceptor.getOptionFlag()

setOptions

public void setOptions(int options)

Description copied from interface: ChannelMessage

sets the option bits for this message

Specified by:

setOptions in interface ChannelMessage

Parameters:

options - sets the message options

See Also:

ChannelMessage.getOptions()

getAddress

public Member getAddress()

Returns the source or reply-to address

Specified by:

getAddress in interface ChannelMessage

Returns:

Member

setAddress

public void setAddress(Member address)

Sets the source or reply-to address

Specified by:

setAddress in interface ChannelMessage

Parameters:

address - Member

generateUUID

public void generateUUID()

Generates a UUID and invokes setUniqueId

getDataPackageLength

public int getDataPackageLength()

getDataPackage

public byte[] getDataPackage()

Serializes the ChannelData object into a byte[] array

Returns:

byte[]

getDataPackage

public byte[] getDataPackage(byte[] data,
                             int offset)

getDataFromPackage

public static ChannelData getDataFromPackage(XByteBuffer xbuf)

Deserializes a ChannelData object from a byte array

getDataFromPackage

public static ChannelData getDataFromPackage(byte[] b)

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Compares to ChannelData objects, only compares on getUniqueId().equals(o.getUniqueId())

Overrides:

equals in class java.lang.Object

Parameters:

o - Object

Returns:

boolean

clone

public java.lang.Object clone()

Create a shallow clone, only the data gets recreated

Specified by:

clone in interface ChannelMessage

Overrides:

clone in class java.lang.Object

Returns:

ClusterData

deepclone

public java.lang.Object deepclone()

Complete clone

Specified by:

deepclone in interface ChannelMessage

Returns:

ClusterData

sendAckSync

public static boolean sendAckSync(int options)

Utility method, returns true if the options flag indicates that an ack is to be sent after the message has been received and processed

Parameters:

options - int - the options for the message

Returns:

boolean

See Also:

Channel.SEND_OPTIONS_USE_ACK, Channel.SEND_OPTIONS_SYNCHRONIZED_ACK

sendAckAsync

public static boolean sendAckAsync(int options)

Utility method, returns true if the options flag indicates that an ack is to be sent after the message has been received but not yet processed

Parameters:

options - int - the options for the message

Returns:

boolean

See Also:

Channel.SEND_OPTIONS_USE_ACK, Channel.SEND_OPTIONS_SYNCHRONIZED_ACK

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

bToS

public static java.lang.String bToS(byte[] data)