org.infinispan.interceptors.base

Class CommandInterceptor

java.lang.Object

org.infinispan.commands.AbstractVisitor

org.infinispan.interceptors.base.CommandInterceptor

Direct Known Subclasses:

BaseCustomInterceptor, BaseRpcInterceptor, BaseStateTransferInterceptor, JmxStatsCommandInterceptor, PrePostProcessingCommandInterceptor

public abstract class CommandInterceptor
extends AbstractVisitor

This is the base class for all interceptors to extend, and implements the Visitor interface allowing it to intercept invocations on VisitableCommands.

Commands are either created by the CacheImpl (for invocations on the Cache public interface), or by the InboundInvocationHandler for remotely originating invocations, and are passed up the interceptor chain by using the InterceptorChain helper class.

When writing interceptors, authors can either override a specific visitXXX() method (such as AbstractVisitor.visitGetKeyValueCommand(InvocationContext, GetKeyValueCommand)) or the more generic CommandInterceptor.handleDefault(InvocationContext, VisitableCommand) which is the default behaviour of any visit method, as defined in AbstractVisitor.handleDefault(InvocationContext, VisitableCommand).

The preferred approach is to override the specific visitXXX() methods that are of interest rather than to override CommandInterceptor.handleDefault(InvocationContext, VisitableCommand) and then write a series of if statements or a switch block, if command-specific behaviour is needed.

Since:

4.0

Author:

Mircea.Markus@jboss.com

See Also:

VisitableCommand, Visitor, InterceptorChain

Field Summary

Fields

Modifier and Type	Field and Description
protected Configuration	cacheConfiguration

Constructor Summary

Constructors

Constructor and Description
CommandInterceptor()

Method Summary

Methods

Modifier and Type	Method and Description
protected long	getLockAcquisitionTimeout(FlagAffectedCommand command, boolean skipLocking)
protected Log	getLog()
CommandInterceptor	getNext() Retrieves the next interceptor in the chain.
protected Object	handleDefault(InvocationContext ctx, VisitableCommand command) The default behaviour of the visitXXX methods, which is to ignore the call and pass the call up to the next interceptor in the chain.
boolean	hasNext()
protected boolean	hasSkipLocking(FlagAffectedCommand command)
void	injectConfiguration(Configuration configuration)
Object	invokeNextInterceptor(InvocationContext ctx, VisitableCommand command) Invokes the next interceptor in the chain.
void	setNext(CommandInterceptor next) Sets the next interceptor in the chain to the interceptor passed in.

Field Detail

cacheConfiguration

protected Configuration cacheConfiguration

Constructor Detail

CommandInterceptor

public CommandInterceptor()

Method Detail

getLog

protected Log getLog()

injectConfiguration

public void injectConfiguration(Configuration configuration)

getNext

public final CommandInterceptor getNext()

Retrieves the next interceptor in the chain.

Returns:

the next interceptor in the chain.

hasNext

public final boolean hasNext()

Returns:

true if there is another interceptor in the chain after this; false otherwise.

setNext

public final void setNext(CommandInterceptor next)

Sets the next interceptor in the chain to the interceptor passed in.

Parameters:

next - next interceptor in the chain.

invokeNextInterceptor

public final Object invokeNextInterceptor(InvocationContext ctx,
                           VisitableCommand command)

Invokes the next interceptor in the chain. This is how interceptor implementations should pass a call up the chain to the next interceptor.

Parameters:

ctx - invocation context

command - command to pass up the chain.

Returns:

return value of the invocation

Throws:

Throwable - in the event of problems

handleDefault

protected Object handleDefault(InvocationContext ctx,
                   VisitableCommand command)

The default behaviour of the visitXXX methods, which is to ignore the call and pass the call up to the next interceptor in the chain.

Overrides:

handleDefault in class AbstractVisitor

Parameters:

ctx - invocation context

command - command to invoke

Returns:

return value

Throws:

Throwable - in the event of problems

getLockAcquisitionTimeout

protected final long getLockAcquisitionTimeout(FlagAffectedCommand command,
                             boolean skipLocking)

hasSkipLocking

protected final boolean hasSkipLocking(FlagAffectedCommand command)