org.mobicents.mgcp.stack
Class TransactionHandler

java.lang.Object
  org.mobicents.mgcp.stack.TransactionHandler

Direct Known Subclasses:

AuditConnectionHandler, AuditEndpointHandler, CreateConnectionHandler, DeleteConnectionHandler, EndpointConfigurationHandler, ModifyConnectionHandler, NotificationRequestHandler, NotifyHandler, RespUnknownHandler, RestartInProgressHandler

public abstract class TransactionHandler
extends java.lang.Object

Implements the base gateway control interface. The MGCP implements the media gateway control interface as a set of transactions. The transactions are composed of a command and a mandatory response. There are eight types of command:

CreateConnection ModifyConnection DeleteConnection NotificationRequest Notify AuditEndpoint AuditConnection RestartInProgress

The first four commands are sent by the Call Agent to a gateway. The Notify command is sent by the gateway to the Call Agent. The gateway may also send a DeleteConnection. The Call Agent may send either of the Audit commands to the gateway. The Gateway may send a RestartInProgress command to the Call Agent. All commands are composed of a Command header, optionally followed by a session description. All responses are composed of a Response header, optionally followed by a session description. Headers and session descriptions are encoded as a set of text lines, separated by a line feed character. The headers are separated from the session description by an empty line. MGCP uses a transaction identifier to correlate commands and responses. The transaction identifier is encoded as a component of the command header and repeated as a component of the response header. Transaction identifiers have values between 1 and 999999999. An MGCP entity shall not reuse a transaction identifier sooner than 3 minutes after completion of the previous command in which the identifier was used.

Author:

Oleg Kulikov, Pavel Mitrenko

Field Summary

protected jain.protocol.ip.mgcp.JainMgcpCommandEvent	commandEvent Used to hold parsed command event
protected JainMgcpStackImpl	stack
static int	TIMEOUT

Constructor Summary

TransactionHandler(JainMgcpStackImpl stack)
Creates a new instance of TransactionHandle Used by provider to prepare origination transaction for sending command message from an application to the stack.

TransactionHandler(JainMgcpStackImpl stack, java.net.InetAddress remoteAddress, int port)
Creates a new instance of TransactionHandle.

Method Summary

protected abstract jain.protocol.ip.mgcp.JainMgcpCommandEvent	decodeCommand(java.lang.String message) Decodes MGCP command message into jain mgcp command event object.
protected abstract jain.protocol.ip.mgcp.JainMgcpResponseEvent	decodeResponse(java.lang.String message) Decodes MGCP response message into jain mgcp response event object.
protected abstract java.lang.String	encode(jain.protocol.ip.mgcp.JainMgcpCommandEvent event) Encodes command event object into MGCP command message.
protected abstract java.lang.String	encode(jain.protocol.ip.mgcp.JainMgcpResponseEvent event) Encodes response event object into MGCP response message.
int	getLocalTID() Returns the transaction handle sent from MGCP provider to listener.
protected java.lang.Object	getObjectSource(int tid) constructs the object source for a command
int	getRemoteTID() Returns the transaction handle sent from application to the MGCP provider.
void	receiveCommand(java.lang.String message) Used by stack for transmitting received MGCP command message to the application.
void	receiveResponse(java.lang.String message) Used by stack for relaying received MGCP response messages to the application.
protected void	release() Release this transaction and frees all allocated resources.
void	send(jain.protocol.ip.mgcp.JainMgcpCommandEvent event) Sends MGCP command from the application to the endpoint specified in the message.
void	send(jain.protocol.ip.mgcp.JainMgcpResponseEvent event) Sends MGCP response message from the application to the host from wich origination command was received.

Methods inherited from class java.lang.Object

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

Field Detail

TIMEOUT

public static final int TIMEOUT

See Also:

Constant Field Values

stack

protected JainMgcpStackImpl stack

commandEvent

protected jain.protocol.ip.mgcp.JainMgcpCommandEvent commandEvent

Used to hold parsed command event

Constructor Detail

TransactionHandler

public TransactionHandler(JainMgcpStackImpl stack)

Creates a new instance of TransactionHandle Used by provider to prepare origination transaction for sending command message from an application to the stack.

Parameters:

stack - the reference to the MGCP stack.

TransactionHandler

public TransactionHandler(JainMgcpStackImpl stack,
                          java.net.InetAddress remoteAddress,
                          int port)

Creates a new instance of TransactionHandle. Used by stack to prepare transaction for transmitting message from provider to the application.

Parameters:

stack - the reference to the MGCP stack.

Method Detail

release

protected void release()

Release this transaction and frees all allocated resources.

getRemoteTID

public int getRemoteTID()

Returns the transaction handle sent from application to the MGCP provider.

Returns:

the int value wich identifiers the transaction handle.

getLocalTID

public int getLocalTID()

Returns the transaction handle sent from MGCP provider to listener.

Returns:

the int value wich identifiers the transaction handle.

encode

protected abstract java.lang.String encode(jain.protocol.ip.mgcp.JainMgcpCommandEvent event)

Encodes command event object into MGCP command message. All descendant classes should implement this method with accordance of the command type.

Parameters:

event - the command event object.

Returns:

the encoded MGCP message.

encode

protected abstract java.lang.String encode(jain.protocol.ip.mgcp.JainMgcpResponseEvent event)

Encodes response event object into MGCP response message. All descendant classes should implement this method with accordance of the response type.

Parameters:

event - the response event object.

Returns:

the encoded MGCP message.

decodeCommand

protected abstract jain.protocol.ip.mgcp.JainMgcpCommandEvent decodeCommand(java.lang.String message)
                                                                     throws java.text.ParseException

Decodes MGCP command message into jain mgcp command event object. All descendant classes should implement this method with accordance of the command type.

Parameters:

MGCP - message

Returns:

jain mgcp command event object.

Throws:

java.text.ParseException

decodeResponse

protected abstract jain.protocol.ip.mgcp.JainMgcpResponseEvent decodeResponse(java.lang.String message)
                                                                       throws java.text.ParseException

Decodes MGCP response message into jain mgcp response event object. All descendant classes should implement this method with accordance of the command type.

Parameters:

MGCP - message

Returns:

jain mgcp response event object.

Throws:

java.text.ParseException

send

public void send(jain.protocol.ip.mgcp.JainMgcpCommandEvent event)

Sends MGCP command from the application to the endpoint specified in the message.

Parameters:

event - the jain mgcp command event object.

send

public void send(jain.protocol.ip.mgcp.JainMgcpResponseEvent event)

Sends MGCP response message from the application to the host from wich origination command was received.

Parameters:

event - the jain mgcp response event object.

receiveCommand

public void receiveCommand(java.lang.String message)

Used by stack for transmitting received MGCP command message to the application.

Parameters:

message - receive MGCP command message.

receiveResponse

public void receiveResponse(java.lang.String message)

Used by stack for relaying received MGCP response messages to the application.

Parameters:

message - receive MGCP response message.

getObjectSource

protected java.lang.Object getObjectSource(int tid)

constructs the object source for a command

Parameters:

tid -

Returns: