org.apache.cxf.clustering
Class FailoverTargetSelector

java.lang.Object
  org.apache.cxf.endpoint.AbstractConduitSelector
      org.apache.cxf.clustering.FailoverTargetSelector

All Implemented Interfaces:

Closeable, ConduitSelector

Direct Known Subclasses:

LoadDistributorTargetSelector

public class FailoverTargetSelector
extends AbstractConduitSelector

Implements a target selection strategy based on failover to an alternate target endpoint when a transport level failure is encountered. Note that this feature changes the conduit on the fly and thus makes the Client not thread safe.

Nested Class Summary

protected class	FailoverTargetSelector.InvocationContext Records the context of an invocation.
protected static class	FailoverTargetSelector.InvocationKey Used to wrap an Exchange for usage as a Map key.

Field Summary

protected FailoverStrategy	failoverStrategy
protected Map<FailoverTargetSelector.InvocationKey,FailoverTargetSelector.InvocationContext>	inProgress

Fields inherited from class org.apache.cxf.endpoint.AbstractConduitSelector

endpoint, KEEP_CONDUIT_ALIVE, selectedConduit

Constructor Summary

FailoverTargetSelector()
Normal constructor.

FailoverTargetSelector(Conduit c)
Constructor, allowing a specific conduit to override normal selection.

Method Summary

void	complete(Exchange exchange) Called on completion of the MEP for which the Conduit was required.
protected long	getDelayBetweenRetries() Returns delay (in milliseconds) between retries
protected Endpoint	getFailoverTarget(Exchange exchange, FailoverTargetSelector.InvocationContext invocation) Get the failover target endpoint, if a suitable one is available.
protected Logger	getLogger()
FailoverStrategy	getStrategy()
protected void	overrideAddressProperty(Map<String,Object> context) Override the ENDPOINT_ADDRESS property in the request context
void	prepare(Message message) Called prior to the interceptor chain being traversed.
protected boolean	requiresFailover(Exchange exchange) Check if the exchange is suitable for a failover.
Conduit	selectConduit(Message message) Called when a Conduit is actually required.
void	setStrategy(FailoverStrategy strategy)

Methods inherited from class org.apache.cxf.endpoint.AbstractConduitSelector

close, getEndpoint, getSelectedConduit, replaceEndpointAddressPropertyIfNeeded, setEndpoint

Methods inherited from class java.lang.Object

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

Field Detail

inProgress

protected Map<FailoverTargetSelector.InvocationKey,FailoverTargetSelector.InvocationContext> inProgress

failoverStrategy

protected FailoverStrategy failoverStrategy

Constructor Detail

FailoverTargetSelector

public FailoverTargetSelector()

Normal constructor.

FailoverTargetSelector

public FailoverTargetSelector(Conduit c)

Constructor, allowing a specific conduit to override normal selection.

Parameters:

c - specific conduit

Method Detail

prepare

public void prepare(Message message)

Called prior to the interceptor chain being traversed.

Parameters:

message - the current Message

selectConduit

public Conduit selectConduit(Message message)

Called when a Conduit is actually required.

Parameters:

message -

Returns:

the Conduit to use for mediation of the message

complete

public void complete(Exchange exchange)

Called on completion of the MEP for which the Conduit was required.

Specified by:

complete in interface ConduitSelector

Overrides:

complete in class AbstractConduitSelector

Parameters:

exchange - represents the completed MEP

setStrategy

public void setStrategy(FailoverStrategy strategy)

Parameters:

strategy - the FailoverStrategy to use

getStrategy

public FailoverStrategy getStrategy()

Returns:

strategy the FailoverStrategy to use

getLogger

protected Logger getLogger()

Specified by:

getLogger in class AbstractConduitSelector

Returns:

the logger to use

getDelayBetweenRetries

protected long getDelayBetweenRetries()

Returns delay (in milliseconds) between retries

Returns:

delay, 0 means no delay

requiresFailover

protected boolean requiresFailover(Exchange exchange)

Check if the exchange is suitable for a failover.

Parameters:

exchange - the current Exchange

Returns:

boolean true if a failover should be attempted

getFailoverTarget

protected Endpoint getFailoverTarget(Exchange exchange,
                                     FailoverTargetSelector.InvocationContext invocation)

Get the failover target endpoint, if a suitable one is available.

Parameters:

exchange - the current Exchange

invocation - the current InvocationContext

Returns:

a failover endpoint if one is available

overrideAddressProperty

protected void overrideAddressProperty(Map<String,Object> context)

Override the ENDPOINT_ADDRESS property in the request context

Parameters:

context - the request context