CM_TIME_BASED_AUTO_RECONNECT_ALGORITHM (Compact 2013)

3/26/2014

This enumeration lists algorithm options for reconnection behavior when CMCB_ALWAYS_CONNECTED connections are lost.

Syntax

typedef enum CM_TIME_BASED_AUTO_RECONNECT_ALGORITHM
{
    CMTR_DEFAULT,
    CMTR_NONE,
    CMTR_LINEAR,
    CMTR_EXPONENTIAL_RANDOMIZED_BACKOFF,

    CMTR_LAST

} CM_TIME_BASED_AUTO_RECONNECT_ALGORITHM;

Element Definitions

• CMTR_DEFAULT
  The default retry supported inbox.

• CMTR_NONE
  No retries based on time will be attempted. This is the recommended default.

  Reconnection attempts are caused only by retry notifications based on system events. For example, a CMRR_CONNECTION_AVAILABLE_TO_CONNECT notification occurs. See Connection Manager Status and Notification Reference.

• CMTR_LINEAR
  Reconnection is attempted based on CM_CONNECTION_CONFIG structure values using a three-stage algorithm:

  1. Attempts reconnections are attempted every DelaySec seconds.
  2. After Attempts reconnection attempts, an unlimited number of reconnection attempts are made every AttemptsExceededDelaySec seconds.
  3. If AttemptsExceededDelaySec == INFINITE then no time-driven attempts are made beyond the number in Attempts.

  In pseudo-code this is:

  for ( int i = 1; i < Attempts; i++ ){
      // wait DelaySec
      // reconnection attempt
  }
  if ( AttemptsExceededDelaySec != INFINITE )
  for ( int i = 1; i < Attempts; i++ ){
      // wait AttemptsExceededDelaySec
      // reconnection attempt
  }
  

• CMTR_EXPONENTIAL_RANDOMIZED_BACKOFF
  Reconnection is attempted every 2^i * DelaySec, with i = 1, 2, …, Attempts, with i increasing after each successive failed attempt, resetting to 1 when connection is connected.

  AttemptsExceededDelaySec behaves as specified in CMTR_LINEAR, above.

  In pseudo-code this is:

  for ( int i = 1; i < Attempts; i++ ){
      // wait ( pow(2,i) * DelaySec )
      // reconnection attempt
  }
  if ( AttemptsExceededDelaySec != INFINITE )
  for ( int i = 1; i < Attempts; i++ ){
      // wait AttemptsExceededDelaySec
      // reconnection attempt
  }
  

• CMTR_LAST
  The last value.

Requirements

Header

cmnet.h

See Also

Reference

Connection Manager Connection Configuration Enumerations
CM_CONNECTION_CONFIG
Connection Manager Status and Notification Reference