org.ow2.carol.cmi.lb.policy
Class FirstAvailablePolicy<T extends org.ow2.carol.cmi.lb.LoadBalanceable>

java.lang.Object
  org.ow2.carol.cmi.lb.policy.AbsLBPolicy<T>
      org.ow2.carol.cmi.lb.policy.FirstAvailablePolicy<T>

Type Parameters:

T - The type of object that was load-balanced

All Implemented Interfaces:

org.ow2.carol.cmi.lb.policy.ILBPolicy<T>

@ThreadSafe
public final class FirstAvailablePolicy<T extends org.ow2.carol.cmi.lb.LoadBalanceable>
extends AbsLBPolicy<T>

Implementation of a policy of load-balancing that always favors the first available load-balanceable. When the list of servers change, we try to keep the current elected load-balanceable if it still exists. If the list order changed, we were switching to another load-balanceable.

Author:

The new CMI team

Constructor Summary

FirstAvailablePolicy()
Build the first available policy.

Method Summary

T	choose(java.util.List<T> loadBalanceables) Chooses the first load-balanceable available among the list of load-balanceable.
java.lang.String	toString()

Methods inherited from class org.ow2.carol.cmi.lb.policy.AbsLBPolicy

getLBStrategy, onInvokeException, onLookupException, onReturn, setClusterViewManager, setLBStrategy

Methods inherited from class java.lang.Object

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

Constructor Detail

FirstAvailablePolicy

public FirstAvailablePolicy()

Build the first available policy.

Method Detail

choose

public T choose(java.util.List<T> loadBalanceables)
                                                      throws org.ow2.carol.cmi.lb.NoLoadBalanceableException

Chooses the first load-balanceable available among the list of load-balanceable.

Specified by:

choose in interface org.ow2.carol.cmi.lb.policy.ILBPolicy<T extends org.ow2.carol.cmi.lb.LoadBalanceable>

Specified by:

choose in class AbsLBPolicy<T extends org.ow2.carol.cmi.lb.LoadBalanceable>

Parameters:

loadBalanceables - the list of load-balanceables

Returns:

the chosen load-balanceable

Throws:

org.ow2.carol.cmi.lb.NoLoadBalanceableException - if no server available

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object