org.daisy.pipeline.tts

Class RoundRobinLoadBalancer

java.lang.Object

org.daisy.pipeline.tts.RoundRobinLoadBalancer

All Implemented Interfaces:

LoadBalancer

public class RoundRobinLoadBalancer
extends Object
implements LoadBalancer

Nested Class Summary

Nested classes/interfaces inherited from interface org.daisy.pipeline.tts.LoadBalancer

LoadBalancer.Host

Constructor Summary

Constructors

Constructor and Description
RoundRobinLoadBalancer(String hostlist, Object syncPoint)

Method Summary

Modifier and Type	Method and Description
void	discard(LoadBalancer.Host h) Discard the given host.
void	discardAll(Collection<LoadBalancer.Host> hosts)
Collection<LoadBalancer.Host>	getAllHosts() Must not be called from different threads.
LoadBalancer.Host	getMaster() Can be called from different threads.
LoadBalancer.Host	selectHost() Can be called from different threads.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinLoadBalancer

public RoundRobinLoadBalancer(String hostlist,
                              Object syncPoint)

Parameters:

hostlist - is the list of hosts. The first host will be considered as the master host.

syncPoint - is used for locking when several threads attempt to call selectHost() with the same syncPoint.

Method Detail

selectHost

public LoadBalancer.Host selectHost()

Description copied from interface: LoadBalancer

Can be called from different threads.

Specified by:

selectHost in interface LoadBalancer

Returns:

the next host chosen according to the load balancer's strategy.

getAllHosts

public Collection<LoadBalancer.Host> getAllHosts()

Description copied from interface: LoadBalancer

Must not be called from different threads.

Specified by:

getAllHosts in interface LoadBalancer

Returns:

all the possible hosts that selectHost() can return. It may be used for checking that all the servers are up. It may not return the master host as long as it cannot be returned by selectHost().

getMaster

public LoadBalancer.Host getMaster()

Description copied from interface: LoadBalancer

Can be called from different threads.

Specified by:

getMaster in interface LoadBalancer

Returns:

the host that should be used for querying general information such as the available voices etc.

discard

public void discard(LoadBalancer.Host h)

Description copied from interface: LoadBalancer

Discard the given host. After this call, selectHost() will no longer return @param h. Must not be called from different threads.

Specified by:

discard in interface LoadBalancer

discardAll

public void discardAll(Collection<LoadBalancer.Host> hosts)