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package gov.nist.javax.sip;

import javax.sip.Dialog;
import javax.sip.SipProvider;

/**
 * Extensions for Next specification revision. These interfaces will remain unchanged and be
 * merged with the next revision of the spec.
 * 
 * 
 * @author mranga
 * 
 */
public interface DialogExt extends Dialog {

    /**
     * Returns the SipProvider that was used for the first transaction in this Dialog
     * 
     * @return SipProvider
     * 
     * @since 2.0
     */
    public SipProvider getSipProvider();

    /**
     * Sets a flag that indicates that this Dialog is part of a BackToBackUserAgent. If this flag
     * is set, INVITEs are not allowed to interleave and timed out ACK transmission results in a
     * BYE being sent to the other side. Setting this flag instructs the stack to automatically
     * handle dialog errors. Once this flag is set for a dialog, it cannot be changed.
     * This flag can be set on a stack-wide basis, on a per-provider basis or on a per Dialog basis.
     * This flag must only be set at the time of Dialog creation. If the flag is set after the first
     * request or response is seen by the Dialog, the behavior of this flag is undefined.
     * 
     * @since 2.0
     */
    public void setBackToBackUserAgent();
    
    
    /**
     * Turn off sequence number validation for this dialog. This passes all requests to the
     * application layer including those that arrive out of order. This is good for testing
     * purposes. Validation is delegated to the application and the stack will not attempt to
     * block requests arriving out of sequence from reaching the application. In particular, the
     * validation of CSeq and the ACK retransmission recognition are delegated to the application.
     * Your application will be responsible for error handling of these cases.
     * 
     * @since 2.0
     */
    public void disableSequenceNumberValidation();

    /**
     * retrieve the value of release references to know if the stack performs optimizations
     * on cleanup to save on memory
     * @return release references value
     * 
     * @since 2.0
     */
    public boolean isReleaseReferences();
    
    /**
     * If set to true it will release all references that it no longer needs. This will include the reference to the
     * Request, Transactions, Any unused timers etc. This will significantly reduce memory
     * consumption under high load
     * @param releaseReferences 
     * 
     * @since 2.0
     */
    public void setReleaseReferences(boolean releaseReferences);
    
    /**
     * Sets the early dialog timeout period. Overrides the value set by the stack configuration property
     * EARLY_DIALOG_TIMEOUT_SECONDS. 
     * A dialog may remain in early state indefinitely. UACs may kill a dialog in early state of periodic 
     * provisional responses are not seen for 3 minutes. This allows you to override the RFC
     * specified value of 3 minutes hence allowing for fast fail over from unresponsive servers.
     */
    public void setEarlyDialogTimeoutSeconds(int timeoutValue);
}