com.bigdata.rdf.sail.webapp.lbs.policy

Class RoundRobinLBSPolicy

java.lang.Object

com.bigdata.rdf.sail.webapp.lbs.AbstractLBSPolicy

com.bigdata.rdf.sail.webapp.lbs.policy.RoundRobinLBSPolicy

All Implemented Interfaces:

QuorumListener, IHALoadBalancerPolicy, IHAPolicyLifeCycle, Serializable

public class RoundRobinLBSPolicy
extends AbstractLBSPolicy

Policy implements a round-robin over the services that are joined with the met quorum.

Author:

Bryan Thompson

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.rdf.sail.webapp.lbs.AbstractLBSPolicy

AbstractLBSPolicy.InitParams

Field Summary

Fields inherited from class com.bigdata.rdf.sail.webapp.lbs.AbstractLBSPolicy

journalRef, serviceIDRef, serviceTableRef

Constructor Summary

Constructors

Constructor and Description
RoundRobinLBSPolicy()

Method Summary

Methods

Modifier and Type	Method and Description
String	getReaderURI(javax.servlet.http.HttpServletRequest request) Return the Request-URL to which a read-only request will be proxied.
protected void	toString(StringBuilder sb) Extension hook for AbstractLBSPolicy.toString() - implementation MUST NOT block.

Methods inherited from class com.bigdata.rdf.sail.webapp.lbs.AbstractLBSPolicy

conditionallyForwardReadRequest, conditionallyUpdateServiceTable, destroy, getJournal, getLeaderURI, getLocalServiceScore, getServiceScoreForHostname, init, notify, service, toString, updateServiceTable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RoundRobinLBSPolicy

public RoundRobinLBSPolicy()

Method Detail

toString

protected void toString(StringBuilder sb)

Description copied from class: AbstractLBSPolicy

Extension hook for AbstractLBSPolicy.toString() - implementation MUST NOT block.

Overrides:

toString in class AbstractLBSPolicy

Parameters:

sb - Buffer where you can write additional state.

getReaderURI

public String getReaderURI(javax.servlet.http.HttpServletRequest request)

Return the Request-URL to which a read-only request will be proxied. The returned URL must include the protocol, hostname and port (if a non-default port will be used) as well as the target request path.

This imposes a round-robin policy over the discovered services. If the service is discovered and appears to be joined with the met quorum, then the request can be proxied to that service.

Parameters:

request - The request.

Returns:

The proxyTo Request-URI -or- null if we could not find a service to which we could proxy this request.