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java.lang.Objectorg.jgroups.View
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 adresses 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.
Field Summary | |
protected java.util.Vector |
members
A list containing all the members of the view This list is always ordered, with the coordinator being the first member. |
protected ViewId |
vid
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Constructor Summary | |
View()
creates an empty view, should not be used |
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View(Address creator,
long id,
java.util.Vector members)
Creates a new view |
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View(ViewId vid,
java.util.Vector members)
Creates a new view |
Method Summary | |
java.lang.Object |
clone()
creates a copy of this view |
boolean |
containsMember(Address mbr)
returns true, if this view contains a certain member |
Address |
getCreator()
returns the creator of this view if this view was created with the empty constructur, null will be returned |
java.util.Vector |
getMembers()
Returns a reference to the List of members (ordered) Do NOT change this list, hence your will invalidate the view Make a copy if you have to modify it. |
ViewId |
getVid()
returns the view ID of this view if this view was created with the empty constructur, null will be returned |
java.lang.String |
printDetails()
debug only |
void |
readExternal(java.io.ObjectInput in)
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int |
size()
returns the number of members in this view |
java.lang.String |
toString()
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void |
writeExternal(java.io.ObjectOutput out)
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Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
protected ViewId vid
protected java.util.Vector members
Constructor Detail |
public View()
public View(ViewId vid, java.util.Vector members)
vid
- 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.public View(Address creator, long id, java.util.Vector members)
creator
- The creator of this view (can not be null)id
- The lamport timestamp of this viewmembers
- Contains a list of all the members in the view, can be empty but not null.Method Detail |
public ViewId getVid()
public Address getCreator()
public java.util.Vector getMembers()
public boolean containsMember(Address mbr)
mbr
- - the address of the member,
public int size()
public java.lang.Object clone()
public java.lang.String printDetails()
public java.lang.String toString()
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
writeExternal
in interface java.io.Externalizable
java.io.IOException
public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
readExternal
in interface java.io.Externalizable
java.io.IOException
java.lang.ClassNotFoundException
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