Membership (Apache Tomcat 7.0.109 API Documentation)

java.lang.Object
- org.apache.catalina.tribes.membership.Membership

All Implemented Interfaces:

Cloneable
```
public class Membership
extends Object
implements Cloneable
```
A membership implementation using simple multicast. This is the representation of a multicast membership. This class is responsible for maintaining a list of active cluster nodes in the cluster. If a node fails to send out a heartbeat, the node will be dismissed.

Author:

Peter Rossbach

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

protected static class Membership.MbrEntry
Inner class that represents a member entry

Nested Classes
Modifier and Type	Class and Description
`protected static class`	`Membership.MbrEntry` Inner class that represents a member entry

Field Summary

Fields
Modifier and Type	Field and Description
`protected static MemberImpl[]`	`EMPTY_MEMBERS`
`protected MemberImpl`	`local` The local member.
`protected HashMap<MemberImpl,Membership.MbrEntry>`	`map` A map of all the members in the cluster.
`protected Comparator<Member>`	`memberComparator` sort members by alive time
`protected MemberImpl[]`	`members` A list of all the members in the cluster.

Constructor Summary

Constructors
Constructor and Description
`Membership(MemberImpl local)`
`Membership(MemberImpl local, boolean includeLocal)` Constructs a new membership
`Membership(MemberImpl local, Comparator<Member> comp)`
`Membership(MemberImpl local, Comparator<Member> comp, boolean includeLocal)`

Method Summary

Methods
Modifier and Type	Method and Description
`Membership.MbrEntry`	`addMember(MemberImpl member)` Add a member to this component and sort array with memberComparator
`Membership`	`clone()`
`boolean`	`contains(Member mbr)`
`MemberImpl[]`	`expire(long maxtime)` Runs a refresh cycle and returns a list of members that has expired.
`Member`	`getMember(Member mbr)`
`protected Membership.MbrEntry[]`	`getMemberEntries()` get a copy from all member entries
`MemberImpl[]`	`getMembers()` Returning a list of all the members in the membership We not need a copy: add and remove generate new arrays.
`boolean`	`hasMembers()` Returning that service has members or not
`boolean`	`memberAlive(MemberImpl member)` Notify the membership that this member has announced itself.
`void`	`removeMember(MemberImpl member)` Remove a member from this component.
`void`	`reset()` Reset the membership and start over fresh.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - EMPTY_MEMBERS
```
protected static final MemberImpl[] EMPTY_MEMBERS
```
  - local
```
protected MemberImpl local
```
    The local member.
  - map
```
protected HashMap<MemberImpl,Membership.MbrEntry> map
```
    A map of all the members in the cluster.
  - members
```
protected MemberImpl[] members
```
    A list of all the members in the cluster.
  - memberComparator
```
protected Comparator<Member> memberComparator
```
    sort members by alive time
- Constructor Detail
  - Membership
```
public Membership(MemberImpl local,
          boolean includeLocal)
```
    Constructs a new membership
    
    Parameters:
    local - - has to be the name of the local member. Used to filter the local member from the cluster membership
    includeLocal - - TBA
  - Membership
```
public Membership(MemberImpl local)
```
  - Membership
```
public Membership(MemberImpl local,
          Comparator<Member> comp)
```
  - Membership
```
public Membership(MemberImpl local,
          Comparator<Member> comp,
          boolean includeLocal)
```
- Method Detail
  - clone
```
public Membership clone()
```
    Overrides:
    
    clone in class Object
  - reset
```
public void reset()
```
    Reset the membership and start over fresh. Ie, delete all the members and wait for them to ping again and join this membership
  - memberAlive
```
public boolean memberAlive(MemberImpl member)
```
    Notify the membership that this member has announced itself.
    
    Parameters:
    member - - the member that just pinged us
    
    Returns:
    - true if this member is new to the cluster, false otherwise.
    - false if this member is the local member or updated.
  - addMember
```
public Membership.MbrEntry addMember(MemberImpl member)
```
    Add a member to this component and sort array with memberComparator
    
    Parameters:
    member - The member to add
  - removeMember
```
public void removeMember(MemberImpl member)
```
    Remove a member from this component.
    
    Parameters:
    member - The member to remove
  - expire
```
public MemberImpl[] expire(long maxtime)
```
    Runs a refresh cycle and returns a list of members that has expired. This also removes the members from the membership, in such a way that getMembers() = getMembers() - expire()
    
    Parameters:
    maxtime - - the max time a member can remain unannounced before it is considered dead.
    
    Returns:
    the list of expired members
  - hasMembers
```
public boolean hasMembers()
```
    Returning that service has members or not
  - getMember
```
public Member getMember(Member mbr)
```
  - contains
```
public boolean contains(Member mbr)
```
  - getMembers
```
public MemberImpl[] getMembers()
```
    Returning a list of all the members in the membership We not need a copy: add and remove generate new arrays.
  - getMemberEntries
```
protected Membership.MbrEntry[] getMemberEntries()
```
    get a copy from all member entries

Class Membership

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

EMPTY_MEMBERS

local

map

members

memberComparator

Constructor Detail

Membership

Membership

Membership

Membership

Method Detail

clone

reset

memberAlive

addMember

removeMember

expire

hasMembers

getMember

contains

getMembers

getMemberEntries