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# ACE_RMCast_Membership Class Reference

Track peer membership. More...

`#include <RMCast_Membership.h>`

Inheritance diagram for ACE_RMCast_Membership:

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Collaboration diagram for ACE_RMCast_Membership:

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List of all members.

## Public Methods

| ACE_RMCast_Membership (void)
| Constructor.
virtual | ~ACE_RMCast_Membership (void)
| Destructor.
int | has_members (void)
| Return 1 if there are still members in the group.
virtual int | ack (ACE_RMCast::Ack &)
| Receive an process an Ack message.
virtual int | join (ACE_RMCast::Join &)
virtual int | leave (ACE_RMCast::Leave &)

## Protected Types

typedef ACE_Unbounded_Set< ACE_RMCast_Proxy * > | Proxy_Collection
| Use an unbounded set to maintain the collection of proxies.
typedef ACE_Unbounded_Set_Iterator< ACE_RMCast_Proxy * > | Proxy_Iterator

## Protected Attributes

Proxy_Collection | proxies_
| The collection of proxies.
ACE_UINT32 | next_expected_

The smallest value of

Parameters:

  next_expected | for all the proxies.

ACE_UINT32 | highest_received_

The highest value of

Parameters:

  highest_received | for all the proxies.

ACE_SYNCH_MUTEX | mutex_
| Synchronization.

## Private Methods

int | generate_ack (ACE_RMCast_Proxy *proxy)
int | compute_ack_i (ACE_RMCast_Proxy *source, ACE_RMCast::Ack &next_ack)
| Compute an Ack message to propagate to the upper layers.

## Detailed Description

Track peer membership.

Reliable senders of events need to know exactly how many peers are receiving the events, and how many events has each peer received so far. This class uses the Join, Leave and Ack messages to build that information, it also summarizes the Ack events and propagate only the global info to the upper layer.

## Member Typedef Documentation

typedef ACE_Unbounded_Set<ACE_RMCast_Proxy*> ACE_RMCast_Membership::Proxy_Collection`[protected]`

| Use an unbounded set to maintain the collection of proxies.

typedef ACE_Unbounded_Set_Iterator<ACE_RMCast_Proxy*> ACE_RMCast_Membership::Proxy_Iterator`[protected]`

## Constructor & Destructor Documentation

ACE_INLINE ACE_RMCast_Membership::ACE_RMCast_Membership | ( | void |  | ) |

| Constructor.

ACE_RMCast_Membership::~ACE_RMCast_Membership | ( | void |  | ) | `[virtual]`

| Destructor.

## Member Function Documentation

int ACE_RMCast_Membership::ack | ( | ACE_RMCast::Ack & |  | ) | `[virtual]`

Receive an process an Ack message.

After receiving the Ack message we find out what is the lowest sequence number received in order among all the acks received by the proxies in the collection. We also find out what is the highest sequence number received by any proxy. We only propagate that information back to the upper layer, and then only if there are any news since the last Ack.

Reimplemented from ACE_RMCast_Module.

int ACE_RMCast_Membership::compute_ack_i | ( | ACE_RMCast_Proxy * | source,
|  | ACE_RMCast::Ack & | next_ack
| ) | `[private]`

| Compute an Ack message to propagate to the upper layers.

int ACE_RMCast_Membership::generate_ack | ( | ACE_RMCast_Proxy * | proxy | ) | `[private]`

| Generate an Ack message, normally due to changes in the collection, such as new proxys joining or leaving

int ACE_RMCast_Membership::has_members | ( | void |  | ) |

| Return 1 if there are still members in the group.

int ACE_RMCast_Membership::join | ( | ACE_RMCast::Join & |  | ) | `[virtual]`

| Add a new member to the collection, using the <source> field in the Join message Reimplemented from ACE_RMCast_Module.

int ACE_RMCast_Membership::leave | ( | ACE_RMCast::Leave & |  | ) | `[virtual]`

| Remove a member from the collection, using the <source> field in the Join message Reimplemented from ACE_RMCast_Module.

## Member Data Documentation

ACE_UINT32 ACE_RMCast_Membership::highest_received_`[protected]`

The highest value of

Parameters:

  highest_received | for all the proxies.

ACE_SYNCH_MUTEX ACE_RMCast_Membership::mutex_`[protected]`

| Synchronization.

ACE_UINT32 ACE_RMCast_Membership::next_expected_`[protected]`

The smallest value of

Parameters:

  next_expected | for all the proxies.

Proxy_Collection ACE_RMCast_Membership::proxies_`[protected]`

| The collection of proxies.

The documentation for this class was generated from the following files:

- RMCast_Membership.h
- RMCast_Membership.cpp
- RMCast_Membership.i