基于redis的cas集群配置

alonli

　　1、cas ticket统一存储
　　做cas集群首先需要将ticket拿出来，做统一存储，以便每个节点访问到的数据一致。官方提供基于memcached的方案，由于项目需要，需要做计入redis，根据官方例子改了一个基于redis版本的。



public class RedisTicketRegistry extends AbstractDistributedTicketRegistry{
@NotNull
private final RedisTemplate reidsTemplate;
/**
* TGT cache entry timeout in seconds.
*/
@Min(0)
private final int tgtTimeout;
/**
* ST cache entry timeout in seconds.
*/
@Min(0)
private final int stTimeout;
public RedisTicketRegistry(RedisTemplate reidsTemplate,int tgtTimeout,int stTimeout){
this.reidsTemplate=reidsTemplate;
this.tgtTimeout=tgtTimeout;
this.stTimeout=stTimeout;
}
@Override
public void addTicket(Ticket ticket) {
logger.debug("Adding ticket {}", ticket);
try {
reidsTemplate.opsForValue().set(ticket.getId(),ticket, getTimeout(ticket), TimeUnit.SECONDS);
} catch (final Exception e) {
logger.error("Failed adding {}", ticket, e);
}
}
@Override
public Ticket getTicket(String ticketId) {
try {
final Ticket t = (Ticket) this.reidsTemplate.opsForValue().get(ticketId);
if (t != null) {
return getProxiedTicketInstance(t);
}
} catch (final Exception e) {
logger.error("Failed fetching {} ", ticketId, e);
}
return null;
}
@Override
public boolean deleteTicket(String ticketId) {
logger.debug("Deleting ticket {}", ticketId);
try {
this.reidsTemplate.delete(ticketId);
return true;
} catch (final Exception e) {
logger.error("Failed deleting {}", ticketId, e);
}
return false;
}
@Override
public Collection getTickets() {
throw new UnsupportedOperationException("GetTickets not supported.");
}
@Override
protected void updateTicket(Ticket ticket) {
logger.debug("Updating ticket {}", ticket);
try {
this.reidsTemplate.delete(ticket.getId());
reidsTemplate.opsForValue().set(ticket.getId(),ticket, getTimeout(ticket), TimeUnit.SECONDS);
} catch (final Exception e) {
logger.error("Failed updating {}", ticket, e);
}
}
@Override
protected boolean needsCallback() {
// TODO Auto-generated method stub
return true;
}
private int getTimeout(final Ticket t) {
if (t instanceof TicketGrantingTicket) {
return this.tgtTimeout;
} else if (t instanceof ServiceTicket) {
return this.stTimeout;
}
throw new IllegalArgumentException("Invalid ticket type");
}
}
　　对应的ticketRegistry.xml的配置如下：








  
  
  
  
  


　　这里既然使用了redis作为ticket存储，就需要将原来的方案给注释掉：






　　到这里，cas的改进就OK了，下面就需要将session也做集群同步。
　　2、tomcat session集群同步
　　这里采用开源的tomcat-redis-session-manager,git hub地址为：https://github.com/jcoleman/tomcat-redis-session-manager
　　这里只使用的是jdk1.7，tomcat7，tomcat6需要重新编译好像。
　　1）拷贝编译打包之后的tomcat-redis-session-manager-VERSION.jar，jedis-2.5.2.jar，commons-pool2-2.2.jar到tomcat/lib目录下
　　2）修改Tomcat context.xml (or the context block of the server.xml if applicable.)





　　至此cas集群配置就可以了。