View

java.lang.Object
- com.fr.third.jgroups.View

所有已实现的接口:

Streamable, java.lang.Comparable<View>, java.lang.Iterable<Address>

直接已知子类:

DeltaView, MergeView
```
public class View
extends java.lang.Object
implements java.lang.Comparable<View>, Streamable, java.lang.Iterable<Address>
```
A view is a local representation of the current membership of a group. Only one view is installed in a channel at a time. Views contain the address of its creator, an ID and a list of member addresses. These addresses are ordered, and the first address is always the coordinator of the view. This way, each member of the group knows who the new coordinator will be if the current one crashes or leaves the group. The views are sent between members using the VIEW_CHANGE event

从以下版本开始:

2.0

作者:

Bela Ban

字段概要

字段
限定符和类型	字段和说明
`protected Address[]`	`members` An array containing all the members of the view.
`protected static boolean`	`suppress_view_size`
`protected ViewId`	`view_id` A view is uniquely identified by its ViewID.

构造器概要

构造器
构造器和说明
`View()` Creates an empty view, should not be used, only used by (de-)serialization
`View(Address creator, long id, java.util.List<Address> members)` Creates a new view
`View(ViewId view_id, Address[] members)` Creates a new view.
`View(ViewId view_id, java.util.List<Address> members)` Creates a new view

方法概要

方法
限定符和类型	方法和说明
`int`	`compareTo(View o)`
`boolean`	`containsMember(Address mbr)` Returns true if this view contains a certain member
`View`	`copy()` 已过时。 View is immutable, so copy() is unnecessary
`static View`	`create(Address coord, long id, Address... members)`
`boolean`	`deepEquals(View other)`
`static Address[][]`	`diff(View from, View to)` Returns the difference between 2 views from and to.
`boolean`	`equals(java.lang.Object obj)`
`Address`	`getCreator()` Returns the creator of this view if this view was created with the empty constructur, null will be returned
`java.util.List<Address>`	`getMembers()` Returns the member list
`Address[]`	`getMembersRaw()` Returns the underlying array.
`ViewId`	`getVid()` 已过时。
`ViewId`	`getViewId()` Returns the view ID of this view if this view was created with the empty constructur, null will be returned
`int`	`hashCode()`
`java.util.Iterator<Address>`	`iterator()`
`static java.util.List<Address>`	`leftMembers(View one, View two)` Returns a list of members which left from view one to two
`void`	`readFrom(java.io.DataInput in)` Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
`int`	`serializedSize()`
`int`	`size()` Returns the number of members in this view
`java.lang.String`	`toString()`
`void`	`writeTo(java.io.DataOutput out)` Write the entire state of the current object (including superclasses) to outstream.

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

- 字段详细资料
  - view_id
```
protected ViewId view_id
```
    A view is uniquely identified by its ViewID. The view id contains the creator address and a Lamport time. The Lamport time is the highest timestamp seen or sent from a view. if a view change comes in with a lower Lamport time, the event is discarded.
  - members
```
protected Address[] members
```
    An array containing all the members of the view. This array is always ordered, with the coordinator being the first member. The second member will be the new coordinator if the current one disappears or leaves the group.
  - suppress_view_size
```
protected static final boolean suppress_view_size
```
- 构造器详细资料
  - View
```
public View()
```
    Creates an empty view, should not be used, only used by (de-)serialization
  - View
```
public View(ViewId view_id,
    java.util.List<Address> members)
```
    Creates a new view
    
    参数:
    view_id - The view id of this view (can not be null)
    members - Contains a list of all the members in the view, can be empty but not null.
  - View
```
public View(ViewId view_id,
    Address[] members)
```
    Creates a new view.
    
    参数:
    view_id - The new view-id
    members - The members. Note that the parameter is not copied.
  - View
```
public View(Address creator,
    long id,
    java.util.List<Address> members)
```
    Creates a new view
    
    参数:
    creator - The creator of this view (can not be null)
    id - The lamport timestamp of this view
    members - Contains a list of all the members in the view, can be empty but not null.
- 方法详细资料
  - create
```
public static View create(Address coord,
          long id,
          Address... members)
```
  - getVid
```
@Deprecated
public ViewId getVid()
```
    已过时。
  - getViewId
```
public ViewId getViewId()
```
    Returns the view ID of this view if this view was created with the empty constructur, null will be returned
    
    返回:
    the view ID of this view
  - getCreator
```
public Address getCreator()
```
    Returns the creator of this view if this view was created with the empty constructur, null will be returned
    
    返回:
    the creator of this view in form of an Address object
  - getMembers
```
public java.util.List<Address> getMembers()
```
    Returns the member list
    
    返回:
    an unmodifiable list
  - getMembersRaw
```
public Address[] getMembersRaw()
```
    Returns the underlying array. The caller must not modify the contents. Should not be used by application code ! This method may be removed at any time, so don't use it !
  - containsMember
```
public boolean containsMember(Address mbr)
```
    Returns true if this view contains a certain member
    
    参数:
    mbr - - the address of the member,
    
    返回:
    true if this view contains the member, false if it doesn't
  - compareTo
```
public int compareTo(View o)
```
    指定者:
    
    compareTo 在接口中 java.lang.Comparable<View>
  - equals
```
public boolean equals(java.lang.Object obj)
```
    覆盖:
    
    equals 在类中 java.lang.Object
  - deepEquals
```
public boolean deepEquals(View other)
```
  - hashCode
```
public int hashCode()
```
    覆盖:
    
    hashCode 在类中 java.lang.Object
  - size
```
public int size()
```
    Returns the number of members in this view
    
    返回:
    the number of members in this view 0..n
  - copy
```
@Deprecated
public View copy()
```
    已过时。 View is immutable, so copy() is unnecessary
    
    Creates a copy of a view
    
    返回:
  - toString
```
public java.lang.String toString()
```
    覆盖:
    
    toString 在类中 java.lang.Object
  - writeTo
```
public void writeTo(java.io.DataOutput out)
             throws java.lang.Exception
```
    从接口复制的说明: Streamable
    
    Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed
    
    指定者:
    
    writeTo 在接口中 Streamable
    
    抛出:
    
    java.lang.Exception
  - readFrom
```
public void readFrom(java.io.DataInput in)
              throws java.lang.Exception
```
    从接口复制的说明: Streamable
    
    Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
    
    指定者:
    
    readFrom 在接口中 Streamable
    
    抛出:
    
    java.lang.Exception
  - serializedSize
```
public int serializedSize()
```
  - leftMembers
```
public static java.util.List<Address> leftMembers(View one,
                                  View two)
```
    Returns a list of members which left from view one to two
    
    参数:
    one -
    two -
    
    返回:
  - diff
```
public static Address[][] diff(View from,
               View to)
```
    Returns the difference between 2 views from and to. It is assumed that view 'from' is logically prior to view 'to'.
    
    参数:
    from - The first view
    to - The second view
    
    返回:
    an array of 2 Address arrays: index 0 has the addresses of the joined member, index 1 those of the left members
  - iterator
```
public java.util.Iterator<Address> iterator()
```
    指定者:
    
    iterator 在接口中 java.lang.Iterable<Address>

类 View

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

view_id

members

suppress_view_size

构造器详细资料

View

View

View

View

方法详细资料

create

getVid

getViewId

getCreator

getMembers

getMembersRaw

containsMember

compareTo

equals

deepEquals

hashCode

size

copy

toString

writeTo

readFrom

serializedSize

leftMembers

diff

iterator