MERGE2

java.lang.Object
- com.fr.third.jgroups.stack.Protocol
- - com.fr.third.jgroups.protocols.MERGE2

已过时。
Use MERGE3 instead, as it causes less traffic, especially for large clusters
```
@Deprecated
public class MERGE2
extends Protocol
```
Protocol to discover subgroups; e.g., existing due to a network partition (that healed). Example: group {p,q,r,s,t,u,v,w} is split into 3 subgroups {p,q}, {r,s,t,u} and {v,w}. This protocol will eventually send a MERGE event with the coordinators of each subgroup up the stack: {p,r,v}. Note that - depending on the time of subgroup discovery - there could also be 2 MERGE events, which first join 2 of the subgroups, and then the resulting group to the last subgroup. The real work of merging the subgroups into one larger group is done somewhere above this protocol (typically in the GMS protocol).
This protocol works as follows:
- If coordinator: periodically multicast a discovery message. Everyone (or (if configured) only the coords) reply with their current view. Based on the received views:
- If there is more than 1 coordinator:
  1. Get all coordinators
  2. Create a MERGE event with the list of coordinators as argument
  3. Send the event up the stack
Provides: sends MERGE event with list of coordinators up the stack
作者:

Bela Ban, Oct 16 2001

嵌套类概要

嵌套类
限定符和类型	类和说明
`protected class`	`MERGE2.FindSubgroupsTask` 已过时。 Task periodically executing (if role is coordinator).
`protected static class`	`MERGE2.MergeHeader` 已过时。

字段概要

字段
限定符和类型	字段和说明
`protected java.lang.String`	`cluster_name` 已过时。
`protected Address`	`current_coord` 已过时。
`protected java.util.concurrent.locks.Condition`	`discovery_cond` 已过时。
`protected java.util.concurrent.locks.Lock`	`discovery_lock` 已过时。
`protected long`	`discovery_timeout` 已过时。
`protected boolean`	`fetching_done` 已过时。
`protected boolean`	`force_sending_discovery_rsps` 已过时。
`protected int`	`inconsistent_view_threshold` 已过时。
`protected boolean`	`is_coord` 已过时。
`protected Address`	`local_addr` 已过时。
`protected long`	`max_interval` 已过时。
`protected java.util.Set<Address>`	`members` 已过时。
`protected java.util.Set<Address>`	`merge_candidates` 已过时。
`protected boolean`	`merge_fast` 已过时。
`protected long`	`merge_fast_delay` 已过时。
`protected long`	`min_interval` 已过时。
`protected int`	`num_inconsistent_views` 已过时。
`protected int`	`num_merge_events` 已过时。
`protected MERGE2.FindSubgroupsTask`	`task` 已过时。
`protected TimeScheduler`	`timer` 已过时。
`protected boolean`	`transport_supports_multicasting` 已过时。
`protected View`	`view` 已过时。
`protected java.util.Map<Address,View>`	`views` 已过时。

从类继承的字段 com.fr.third.jgroups.stack.Protocol
down_prot, ergonomics, id, log, name, stack, stats, up_prot

构造器概要

构造器
构造器和说明

MERGE2()
已过时。

构造器
构造器和说明
`MERGE2()` 已过时。

方法概要

方法
限定符和类型	方法和说明
`java.lang.Object`	`down(Event evt)` 已过时。 An event is to be sent down the stack.
`java.lang.String`	`fetchAllViews()` 已过时。
`java.lang.String`	`getCurrentCoord()` 已过时。
`long`	`getMaxInterval()` 已过时。
`long`	`getMinInterval()` 已过时。
`protected void`	`handle(MERGE2.MergeHeader hdr, Address sender)` 已过时。
`void`	`init()` 已过时。 Called after instance has been created (null constructor) and before protocol is started.
`protected boolean`	`isMergeRunning()` 已过时。
`boolean`	`isMergeTaskRunning()` 已过时。
`protected void`	`mergeFast(Address dest, Address sender)` 已过时。
`void`	`sendMergeSolicitation()` 已过时。 Discovers members and detects whether we have multiple coordinator.
`void`	`setMaxInterval(long l)` 已过时。
`void`	`setMinInterval(long i)` 已过时。
`void`	`startMergeTask()` 已过时。
`void`	`stop()` 已过时。 This method is called on a `Channel.disconnect()`.
`void`	`stopMergeTask()` 已过时。
`java.lang.Object`	`up(Event evt)` 已过时。 An event was received from the layer below.
`void`	`up(MessageBatch batch)` 已过时。 Sends up a multiple messages in a `MessageBatch`.

从类继承的方法 com.fr.third.jgroups.stack.Protocol
accept, destroy, dumpStats, enableStats, getConfigurableObjects, getDownProtocol, getDownServices, getId, getIdsAbove, getLevel, getName, getProtocolStack, getSocketFactory, getThreadFactory, getTransport, getUpProtocol, getUpServices, getValue, isErgonomics, level, parse, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, resetStatistics, resetStats, setDownProtocol, setErgonomics, setId, setLevel, setProtocolStack, setSocketFactory, setUpProtocol, setValue, setValues, start, statsEnabled

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - min_interval
```
protected long min_interval
```
    已过时。
  - max_interval
```
protected long max_interval
```
    已过时。
  - inconsistent_view_threshold
```
protected int inconsistent_view_threshold
```
    已过时。
  - merge_fast
```
protected boolean merge_fast
```
    已过时。
  - merge_fast_delay
```
protected long merge_fast_delay
```
    已过时。
  - force_sending_discovery_rsps
```
protected boolean force_sending_discovery_rsps
```
    已过时。
  - discovery_timeout
```
protected long discovery_timeout
```
    已过时。
  - local_addr
```
protected Address local_addr
```
    已过时。
  - view
```
protected volatile View view
```
    已过时。
  - members
```
protected final java.util.Set<Address> members
```
    已过时。
  - merge_candidates
```
protected final java.util.Set<Address> merge_candidates
```
    已过时。
  - task
```
protected final MERGE2.FindSubgroupsTask task
```
    已过时。
  - is_coord
```
protected volatile boolean is_coord
```
    已过时。
  - current_coord
```
protected volatile Address current_coord
```
    已过时。
  - timer
```
protected TimeScheduler timer
```
    已过时。
  - num_inconsistent_views
```
protected int num_inconsistent_views
```
    已过时。
  - num_merge_events
```
protected int num_merge_events
```
    已过时。
  - views
```
protected final java.util.Map<Address,View> views
```
    已过时。
  - discovery_lock
```
protected final java.util.concurrent.locks.Lock discovery_lock
```
    已过时。
  - discovery_cond
```
protected final java.util.concurrent.locks.Condition discovery_cond
```
    已过时。
  - fetching_done
```
protected volatile boolean fetching_done
```
    已过时。
  - transport_supports_multicasting
```
protected boolean transport_supports_multicasting
```
    已过时。
  - cluster_name
```
protected java.lang.String cluster_name
```
    已过时。
- 构造器详细资料
  - MERGE2
```
public MERGE2()
```
    已过时。
- 方法详细资料
  - isMergeTaskRunning
```
public boolean isMergeTaskRunning()
```
    已过时。
  - init
```
public void init()
          throws java.lang.Exception
```
    已过时。
    
    从类复制的说明: Protocol
    
    Called after instance has been created (null constructor) and before protocol is started. Properties are already set. Other protocols are not yet connected and events cannot yet be sent.
    
    覆盖:
    
    init 在类中 Protocol
    
    抛出:
    
    java.lang.Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the channel constructor will throw an exception
  - getMinInterval
```
public long getMinInterval()
```
    已过时。
  - setMinInterval
```
public void setMinInterval(long i)
```
    已过时。
  - getMaxInterval
```
public long getMaxInterval()
```
    已过时。
  - setMaxInterval
```
public void setMaxInterval(long l)
```
    已过时。
  - isMergeRunning
```
protected boolean isMergeRunning()
```
    已过时。
  - sendMergeSolicitation
```
public void sendMergeSolicitation()
```
    已过时。
    
    Discovers members and detects whether we have multiple coordinator. If so, kicks off a merge
  - getCurrentCoord
```
public java.lang.String getCurrentCoord()
```
    已过时。
  - startMergeTask
```
public void startMergeTask()
```
    已过时。
  - stopMergeTask
```
public void stopMergeTask()
```
    已过时。
  - fetchAllViews
```
public java.lang.String fetchAllViews()
```
    已过时。
  - stop
```
public void stop()
```
    已过时。
    
    从类复制的说明: Protocol
    
    This method is called on a Channel.disconnect(). Stops work (e.g. by closing multicast socket). Will be called from top to bottom. This means that at the time of the method invocation the neighbor protocol below is still working. This method will replace the STOP, STOP_OK, CLEANUP and CLEANUP_OK events. The ProtocolStack guarantees that when this method is called all messages in the down queue will have been flushed
    
    覆盖:
    
    stop 在类中 Protocol
  - down
```
public java.lang.Object down(Event evt)
```
    已过时。
    
    从类复制的说明: Protocol
    
    An event is to be sent down the stack. The layer may want to examine its type and perform some action on it, depending on the event's type. If the event is a message MSG, then the layer may need to add a header to it (or do nothing at all) before sending it down the stack using down_prot.down(). In case of a GET_ADDRESS event (which tries to retrieve the stack's address from one of the bottom layers), the layer may need to send a new response event back up the stack using up_prot.up().
    
    覆盖:
    
    down 在类中 Protocol
  - up
```
public java.lang.Object up(Event evt)
```
    已过时。
    
    从类复制的说明: Protocol
    
    An event was received from the layer below. Usually the current layer will want to examine the event type and - depending on its type - perform some computation (e.g. removing headers from a MSG event type, or updating the internal membership list when receiving a VIEW_CHANGE event). Finally the event is either a) discarded, or b) an event is sent down the stack using down_prot.down() or c) the event (or another event) is sent up the stack using up_prot.up().
    
    覆盖:
    
    up 在类中 Protocol
  - up
```
public void up(MessageBatch batch)
```
    已过时。
    
    从类复制的说明: Protocol
    
    Sends up a multiple messages in a MessageBatch. The sender of the batch is always the same, and so is the destination (null == multicast messages). Messages in a batch can be OOB messages, regular messages, or mixed messages, although the transport itself will create initial MessageBatches that contain only either OOB or regular messages.
    The default processing below sends messages up the stack individually, based on a matching criteria (calling Protocol.accept(Message)), and - if true - calls Protocol.up(Event) for that message and removes the message. If the batch is not empty, it is passed up, or else it is dropped.
    Subclasses should check if there are any messages destined for them (e.g. using MessageBatch.getMatchingMessages(short, boolean)), then possibly remove and process them and finally pass the batch up to the next protocol. Protocols can also modify messages in place, e.g. ENCRYPT could decrypt all encrypted messages in the batch, not remove them, and pass the batch up when done.
    
    覆盖:
    
    up 在类中 Protocol
    
    参数:
    batch - The message batch
  - mergeFast
```
protected void mergeFast(Address dest,
             Address sender)
```
    已过时。
  - handle
```
protected void handle(MERGE2.MergeHeader hdr,
          Address sender)
```
    已过时。

类 MERGE2

嵌套类概要

字段概要

从类继承的字段 com.fr.third.jgroups.stack.Protocol

构造器概要

方法概要

从类继承的方法 com.fr.third.jgroups.stack.Protocol

从类继承的方法 java.lang.Object

字段详细资料

min_interval

max_interval

inconsistent_view_threshold

merge_fast

merge_fast_delay

force_sending_discovery_rsps

discovery_timeout

local_addr

view

members

merge_candidates

task

is_coord

current_coord

timer

num_inconsistent_views

num_merge_events

views

discovery_lock

discovery_cond

fetching_done

transport_supports_multicasting

cluster_name

构造器详细资料

MERGE2

方法详细资料

isMergeTaskRunning

init

getMinInterval

setMinInterval

getMaxInterval

setMaxInterval

isMergeRunning

sendMergeSolicitation

getCurrentCoord

startMergeTask

stopMergeTask

fetchAllViews

stop

down

up

up

mergeFast

handle