org.jboss.ha.framework.interfaces
Class FirstAvailable
java.lang.Object
org.jboss.ha.framework.interfaces.FirstAvailable
- All Implemented Interfaces:
- Serializable, org.jboss.ha.client.loadbalance.LoadBalancePolicy
public class FirstAvailable
- extends Object
- implements LoadBalancePolicy
LoadBalancingPolicy implementation that always favor the first available target i.e.
no load balancing occurs. Nevertheless, the first target is randomly selected.
This does not mean that fail-over will not occur if the
first member in the list dies. In this case, fail-over will occur, and a new target
will become the first member and invocation will continously be invoked on the same
new target until its death. Each proxy using this policy will elect its own
prefered target: the target is not shared accross the proxy family (for this
behaviour please take a look at FirstAvailableIdenticalAllProxies)
- Version:
- $Revision: 81001 $
- Author:
- Bill Burke., Sacha Labourey.
- See Also:
Revisions:
2002/08/24: Sacha Labourey
- Use the target repository
- First choice is randomly selected to distribute the initial load
- When the list of targets change, we try to keep using the same
previously elected target node if it still exists. Previously,
we were working with the position id of the target node, thus
if the list order changed, we were switching to another node
while our prefered node was still up
,
Serialized Form
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
electedTarget
protected transient Object electedTarget
FirstAvailable
public FirstAvailable()
init
public void init(HARMIClient father)
- Description copied from interface:
LoadBalancePolicy
- Initialize the policy with a reference to its parent stub. the load-balancing policy
implementation can use HARMIClient data to take its decision
- Parameters:
father
- The stub that owns the policy
chooseTarget
public Object chooseTarget(org.jboss.ha.framework.interfaces.FamilyClusterInfo clusterFamily)
- Specified by:
chooseTarget
in interface org.jboss.ha.client.loadbalance.LoadBalancePolicy
chooseTarget
public Object chooseTarget(org.jboss.ha.framework.interfaces.FamilyClusterInfo clusterFamily,
Invocation routingDecision)
- Description copied from interface:
LoadBalancePolicy
- Called when the stub wishes to know on which node the next invocation must
be performed.
- Parameters:
clusterFamily
- A list of potential target nodesroutingDecision
- The actual invocation object if the policy wants
to have some kind of invocation-based routing strategy
- Returns:
- The selected target for the next invocation
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