TransactionState (jain-sip-ri 1.2.280 API)

java.lang.Object
- javax.sip.TransactionState

All Implemented Interfaces:

Serializable
```
public final class TransactionState
extends Object
implements Serializable
```
This class contains the enumerations that define the underlying state of an existing transaction. SIP defines four types of transactions, these are Invite Client transactions, Invite Server transactions, Non-Invite Client transactions and Non-Invite Server transactions. There are six explicit states for the various transactions, namely:
- Calling:
  - Invite Client transaction: The initial state, "calling", MUST be entered when the application initiates a new client transaction with an INVITE request.
- Trying:
  - Non-Invite Client transaction: The initial state "Trying" is entered when the application initiates a new client transaction with a request.
  - Non-Invite Server transaction: The initial state "Trying" is entered when the application is passed a request other than INVITE or ACK.
- Proceeding:
  - Invite Client transaction: If the client transaction receives a provisional response while in the "Calling" state, it transitions to the "Proceeding" state.
  - Non-Invite Client transaction: If a provisional response is received while in the "Trying" state, the client transaction SHOULD move to the "Proceeding" state.
  - Invite Server transaction: When a server transaction is constructed for a request, it enters the initial state "Proceeding".
  - Non-Invite Server transaction: While in the "Trying" state, if the application passes a provisional response to the server transaction, the server transaction MUST enter the "Proceeding" state.
- Completed: The "Completed" state exists to buffer any additional response retransmissions that may be received, which is why the client transaction remains there only for unreliable transports.
  - Invite Client transaction: When in either the "Calling" or "Proceeding" states, reception of a response with status code from 300-699 MUST cause the client transaction to transition to "Completed".
  - Non-Invite Client transaction: If a final response (status codes 200-699) is received while in the "Trying" or "Proceeding" state, the client transaction MUST transition to the "Completed" state.
  - Invite Server transaction: While in the "Proceeding" state, if the application passes a response with status code from 300 to 699 to the server transaction, the state machine MUST enter the "Completed" state.
  - Non-Invite Server transaction: If the application passes a final response (status codes 200-699) to the server while in the "Proceeding" state, the transaction MUST enter the "Completed" state.
- Confirmed: The purpose of the "Confirmed" state is to absorb any additional ACK messages that arrive, triggered from retransmissions of the final response. Once this time expires the server MUST transition to the "Terminated" state.
  - Invite Server transaction: If an ACK is received while the server transaction is in the "Completed" state, the server transaction MUST transition to the "Confirmed" state.
- Terminated: The transaction MUST be available for garbage collection the instant it enters the "Terminated" state.
  - Invite Client transaction: When in either the "Calling" or "Proceeding" states, reception of a 2xx response MUST cause the client transaction to enter the "Terminated" state. If amount of time that the server transaction can remain in the "Completed" state when unreliable transports are used expires while the client transaction is in the "Completed" state, the client transaction MUST move to the "Terminated" state.
  - Non-Invite Client transaction: If the transaction times out while the client transaction is still in the "Trying" or "Proceeding" state, the client transaction SHOULD inform the application about the timeout, and then it SHOULD enter the "Terminated" state. If the response retransmissions buffer expires while in the "Completed" state, the client transaction MUST transition to the "Terminated" state.
  - Invite Server transaction: If in the "Proceeding" state, and the application passes a 2xx response to the server transaction, the server transaction MUST transition to the "Terminated" state. When the server transaction abandons retransmitting the response while in the "Completed" state, it implies that the ACK was never received. In this case, the server transaction MUST transition to the "Terminated" state, and MUST indicate to the TU that a transaction failure has occurred.
  - Non-Invite Server transaction: If the request retransmissions buffer expires while in the "Completed" state, the server transaction MUST transition to the "Terminated" state.
For each specific transaction state machine, refer to RFC3261.
Version:

1.2

Author:

BEA Systems, NIST

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`_CALLING` This constant value indicates the internal value of the "Calling" constant.
`static int`	`_COMPLETED` This constant value indicates the internal value of the "Completed" constant.
`static int`	`_CONFIRMED` This constant value indicates the internal value of the "Confirmed" constant.
`static int`	`_PROCEEDING` This constant value indicates the internal value of the "Proceeding" constant.
`static int`	`_TERMINATED` This constant value indicates the internal value of the "Terminated" constant.
`static int`	`_TRYING` This constant value indicates the internal value of the "Trying" constant.
`static TransactionState`	`CALLING` This constant value indicates that the transaction state is "Calling".
`static TransactionState`	`COMPLETED` This constant value indicates that the transaction state is "Completed".
`static TransactionState`	`CONFIRMED` This constant value indicates that the transaction state is "Confirmed".
`static TransactionState`	`PROCEEDING` This constant value indicates that the transaction state is "Proceeding".
`static TransactionState`	`TERMINATED` This constant value indicates that the transaction state is "Terminated".
`static TransactionState`	`TRYING` This constant value indicates that the transaction state is "Trying".

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object obj)` Compare this transaction state for equality with another.
`static TransactionState`	`getObject(int transactionState)` This method returns the object value of the TransactionState
`int`	`getValue()` This method returns the integer value of the TransactionState
`int`	`hashCode()` Get a hash code value for this transaction state.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - _CALLING
```
public static final int _CALLING
```
    This constant value indicates the internal value of the "Calling" constant.
    This constant has an integer value of 0.
    
    See Also:
    Constant Field Values
  - CALLING
```
public static final TransactionState CALLING
```
    This constant value indicates that the transaction state is "Calling".
  - _TRYING
```
public static final int _TRYING
```
    This constant value indicates the internal value of the "Trying" constant. This constant has an integer value of 1.
    
    See Also:
    Constant Field Values
  - TRYING
```
public static final TransactionState TRYING
```
    This constant value indicates that the transaction state is "Trying".
  - _PROCEEDING
```
public static final int _PROCEEDING
```
    This constant value indicates the internal value of the "Proceeding" constant.
    This constant has an integer value of 2.
    
    See Also:
    Constant Field Values
  - PROCEEDING
```
public static final TransactionState PROCEEDING
```
    This constant value indicates that the transaction state is "Proceeding".
  - _COMPLETED
```
public static final int _COMPLETED
```
    This constant value indicates the internal value of the "Completed" constant.
    This constant has an integer value of 3.
    
    See Also:
    Constant Field Values
  - COMPLETED
```
public static final TransactionState COMPLETED
```
    This constant value indicates that the transaction state is "Completed".
  - _CONFIRMED
```
public static final int _CONFIRMED
```
    This constant value indicates the internal value of the "Confirmed" constant.
    This constant has an integer value of 4.
    
    See Also:
    Constant Field Values
  - CONFIRMED
```
public static final TransactionState CONFIRMED
```
    This constant value indicates that the transaction state is "Confirmed".
  - _TERMINATED
```
public static final int _TERMINATED
```
    This constant value indicates the internal value of the "Terminated" constant.
    This constant has an integer value of 5.
    
    See Also:
    Constant Field Values
  - TERMINATED
```
public static final TransactionState TERMINATED
```
    This constant value indicates that the transaction state is "Terminated".
- Method Detail
  - getObject
```
public static TransactionState getObject(int transactionState)
```
    This method returns the object value of the TransactionState
    
    Parameters:
    transactionState - The integer value of the TransactionState
    
    Returns:
    The TransactionState Object
  - getValue
```
public int getValue()
```
    This method returns the integer value of the TransactionState
    
    Returns:
    The integer value of the TransactionState
  - equals
```
public boolean equals(Object obj)
```
    Compare this transaction state for equality with another.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    obj - the object to compare this with.
    
    Returns:
    true if obj is an instance of this class representing the same transaction state as this, false otherwise.
    Since:
    
    1.2
  - hashCode
```
public int hashCode()
```
    Get a hash code value for this transaction state.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    a hash code value.
    Since:
    
    1.2
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class TransactionState

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

_CALLING

CALLING

_TRYING

TRYING

_PROCEEDING

PROCEEDING

_COMPLETED

COMPLETED

_CONFIRMED

CONFIRMED

_TERMINATED

TERMINATED

Method Detail

getObject

getValue

equals

hashCode

toString