org.springframework.remoting.rmi

Class JndiRmiClientInterceptor

java.lang.Object

org.springframework.jndi.JndiAccessor

org.springframework.jndi.JndiLocatorSupport

org.springframework.jndi.JndiObjectLocator

org.springframework.remoting.rmi.JndiRmiClientInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, InitializingBean

Direct Known Subclasses:

JndiRmiProxyFactoryBean

public class JndiRmiClientInterceptor
extends JndiObjectLocator
implements MethodInterceptor, InitializingBean

MethodInterceptor for accessing RMI services from JNDI. Typically used for RMI-IIOP (CORBA), but can also be used for EJB home objects (for example, a Stateful Session Bean home). In contrast to a plain JNDI lookup, this accessor also performs narrowing through PortableRemoteObject.

With conventional RMI services, this invoker is typically used with the RMI service interface. Alternatively, this invoker can also proxy a remote RMI service with a matching non-RMI business interface, i.e. an interface that mirrors the RMI service methods but does not declare RemoteExceptions. In the latter case, RemoteExceptions thrown by the RMI stub will automatically get converted to Spring's unchecked RemoteAccessException.

The JNDI environment can be specified as "jndiEnvironment" property, or be configured in a jndi.properties file or as system properties. For example:

<property name="jndiEnvironment">
         <props>
                 <prop key="java.naming.factory.initial">com.sun.jndi.cosnaming.CNCtxFactory</prop>
                 <prop key="java.naming.provider.url">iiop://localhost:1050</prop>
         </props>
 </property>

Since:

1.1

Author:

Juergen Hoeller

See Also:

JndiAccessor.setJndiTemplate(org.springframework.jndi.JndiTemplate), JndiAccessor.setJndiEnvironment(java.util.Properties), JndiObjectLocator.setJndiName(java.lang.String), JndiRmiServiceExporter, JndiRmiProxyFactoryBean, RemoteAccessException, RemoteException, Remote, PortableRemoteObject.narrow(java.lang.Object, java.lang.Class)

Field Summary

Fields inherited from class org.springframework.jndi.JndiLocatorSupport

CONTAINER_PREFIX

Fields inherited from class org.springframework.jndi.JndiAccessor

logger

Constructor Summary

Constructors

Constructor and Description
JndiRmiClientInterceptor()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected RemoteInvocation	createRemoteInvocation(MethodInvocation methodInvocation) Create a new RemoteInvocation object for the given AOP method invocation.
protected Object	doInvoke(MethodInvocation invocation, Object stub) Perform the given invocation on the given RMI stub.
protected Object	doInvoke(MethodInvocation methodInvocation, RmiInvocationHandler invocationHandler) Apply the given AOP method invocation to the given RmiInvocationHandler.
RemoteInvocationFactory	getRemoteInvocationFactory() Return the RemoteInvocationFactory used by this accessor.
Class<?>	getServiceInterface() Return the interface of the service to access.
protected Object	getStub() Return the RMI stub to use.
Object	invoke(MethodInvocation invocation) Fetches an RMI stub and delegates to doInvoke(org.aopalliance.intercept.MethodInvocation, java.lang.Object).
protected boolean	isConnectFailure(RemoteException ex) Determine whether the given RMI exception indicates a connect failure.
protected boolean	isConnectFailure(SystemException ex) Determine whether the given CORBA exception indicates a connect failure.
protected Object	lookupStub() Create the RMI stub, typically by looking it up.
void	prepare() Fetches the RMI stub on startup, if necessary.
protected Object	refreshAndRetry(MethodInvocation invocation) Refresh the RMI stub and retry the given invocation.
void	setCacheStub(boolean cacheStub) Set whether to cache the RMI stub once it has been located.
void	setExposeAccessContext(boolean exposeAccessContext) Set whether to expose the JNDI environment context for all access to the target RMI stub, i.e.
void	setLookupStubOnStartup(boolean lookupStubOnStartup) Set whether to look up the RMI stub on startup.
void	setRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure) Set whether to refresh the RMI stub on connect failure.
void	setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory) Set the RemoteInvocationFactory to use for this accessor.
void	setServiceInterface(Class<?> serviceInterface) Set the interface of the service to access.

Methods inherited from class org.springframework.jndi.JndiObjectLocator

getExpectedType, getJndiName, lookup, setExpectedType, setJndiName

Methods inherited from class org.springframework.jndi.JndiLocatorSupport

convertJndiName, isResourceRef, lookup, lookup, setResourceRef

Methods inherited from class org.springframework.jndi.JndiAccessor

getJndiEnvironment, getJndiTemplate, setJndiEnvironment, setJndiTemplate

Methods inherited from class java.lang.Object

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

Constructor Detail

JndiRmiClientInterceptor

public JndiRmiClientInterceptor()

Method Detail

setServiceInterface

public void setServiceInterface(Class<?> serviceInterface)

Set the interface of the service to access. The interface must be suitable for the particular service and remoting tool.

Typically required to be able to create a suitable service proxy, but can also be optional if the lookup returns a typed stub.

getServiceInterface

public Class<?> getServiceInterface()

Return the interface of the service to access.

setRemoteInvocationFactory

public void setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory)

Set the RemoteInvocationFactory to use for this accessor. Default is a DefaultRemoteInvocationFactory.

A custom invocation factory can add further context information to the invocation, for example user credentials.

getRemoteInvocationFactory

public RemoteInvocationFactory getRemoteInvocationFactory()

Return the RemoteInvocationFactory used by this accessor.

setLookupStubOnStartup

public void setLookupStubOnStartup(boolean lookupStubOnStartup)

Set whether to look up the RMI stub on startup. Default is "true".

Can be turned off to allow for late start of the RMI server. In this case, the RMI stub will be fetched on first access.

See Also:

setCacheStub(boolean)

setCacheStub

public void setCacheStub(boolean cacheStub)

Set whether to cache the RMI stub once it has been located. Default is "true".

Can be turned off to allow for hot restart of the RMI server. In this case, the RMI stub will be fetched for each invocation.

See Also:

setLookupStubOnStartup(boolean)

setRefreshStubOnConnectFailure

public void setRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure)

Set whether to refresh the RMI stub on connect failure. Default is "false".

Can be turned on to allow for hot restart of the RMI server. If a cached RMI stub throws an RMI exception that indicates a remote connect failure, a fresh proxy will be fetched and the invocation will be retried.

See Also:

ConnectException, ConnectIOException, NoSuchObjectException

setExposeAccessContext

public void setExposeAccessContext(boolean exposeAccessContext)

Set whether to expose the JNDI environment context for all access to the target RMI stub, i.e. for all method invocations on the exposed object reference.

Default is "false", i.e. to only expose the JNDI context for object lookup. Switch this flag to "true" in order to expose the JNDI environment (including the authorization context) for each RMI invocation, as needed by WebLogic for RMI stubs with authorization requirements.

afterPropertiesSet

public void afterPropertiesSet()
                        throws NamingException

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class JndiObjectLocator

Throws:

NamingException

prepare

public void prepare()
             throws RemoteLookupFailureException

Fetches the RMI stub on startup, if necessary.

Throws:

RemoteLookupFailureException - if RMI stub creation failed

See Also:

setLookupStubOnStartup(boolean), lookupStub()

lookupStub

protected Object lookupStub()
                     throws RemoteLookupFailureException

Create the RMI stub, typically by looking it up.

Called on interceptor initialization if "cacheStub" is "true"; else called for each invocation by getStub().

The default implementation retrieves the service from the JNDI environment. This can be overridden in subclasses.

Returns:

the RMI stub to store in this interceptor

Throws:

RemoteLookupFailureException - if RMI stub creation failed

See Also:

setCacheStub(boolean), JndiObjectLocator.lookup()

getStub

protected Object getStub()
                  throws NamingException,
                         RemoteLookupFailureException

Return the RMI stub to use. Called for each invocation.

The default implementation returns the stub created on initialization, if any. Else, it invokes lookupStub() to get a new stub for each invocation. This can be overridden in subclasses, for example in order to cache a stub for a given amount of time before recreating it, or to test the stub whether it is still alive.

Returns:

the RMI stub to use for an invocation

Throws:

NamingException - if stub creation failed

RemoteLookupFailureException - if RMI stub creation failed

invoke

public Object invoke(MethodInvocation invocation)
              throws Throwable

Fetches an RMI stub and delegates to doInvoke(org.aopalliance.intercept.MethodInvocation, java.lang.Object). If configured to refresh on connect failure, it will call refreshAndRetry(org.aopalliance.intercept.MethodInvocation) on corresponding RMI exceptions.

Specified by:

invoke in interface MethodInterceptor

Parameters:

invocation - the method invocation joinpoint

Returns:

the result of the call to Joinpoint.proceed(); might be intercepted by the interceptor

Throws:

Throwable - if the interceptors or the target object throws an exception

See Also:

getStub(), doInvoke(org.aopalliance.intercept.MethodInvocation, java.lang.Object), refreshAndRetry(org.aopalliance.intercept.MethodInvocation), ConnectException, ConnectIOException, NoSuchObjectException

isConnectFailure

protected boolean isConnectFailure(RemoteException ex)

Determine whether the given RMI exception indicates a connect failure.

The default implementation delegates to RmiClientInterceptorUtils.isConnectFailure(java.rmi.RemoteException).

Parameters:

ex - the RMI exception to check

Returns:

whether the exception should be treated as connect failure

isConnectFailure

protected boolean isConnectFailure(SystemException ex)

Determine whether the given CORBA exception indicates a connect failure.

The default implementation checks for CORBA's OBJECT_NOT_EXIST exception.

Parameters:

ex - the RMI exception to check

Returns:

whether the exception should be treated as connect failure

refreshAndRetry

protected Object refreshAndRetry(MethodInvocation invocation)
                          throws Throwable

Refresh the RMI stub and retry the given invocation. Called by invoke on connect failure.

Parameters:

invocation - the AOP method invocation

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

See Also:

invoke(org.aopalliance.intercept.MethodInvocation)

doInvoke

protected Object doInvoke(MethodInvocation invocation,
                          Object stub)
                   throws Throwable

Perform the given invocation on the given RMI stub.

Parameters:

invocation - the AOP method invocation

stub - the RMI stub to invoke

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

doInvoke

protected Object doInvoke(MethodInvocation methodInvocation,
                          RmiInvocationHandler invocationHandler)
                   throws RemoteException,
                          NoSuchMethodException,
                          IllegalAccessException,
                          InvocationTargetException

Apply the given AOP method invocation to the given RmiInvocationHandler.

The default implementation delegates to createRemoteInvocation(org.aopalliance.intercept.MethodInvocation).

Parameters:

methodInvocation - the current AOP method invocation

invocationHandler - the RmiInvocationHandler to apply the invocation to

Returns:

the invocation result

Throws:

RemoteException - in case of communication errors

NoSuchMethodException - if the method name could not be resolved

IllegalAccessException - if the method could not be accessed

InvocationTargetException - if the method invocation resulted in an exception

See Also:

RemoteInvocation

createRemoteInvocation

protected RemoteInvocation createRemoteInvocation(MethodInvocation methodInvocation)

Create a new RemoteInvocation object for the given AOP method invocation.

The default implementation delegates to the configured RemoteInvocationFactory. This can be overridden in subclasses in order to provide custom RemoteInvocation subclasses, containing additional invocation parameters (e.g. user credentials).

Note that it is preferable to build a custom RemoteInvocationFactory as a reusable strategy, instead of overriding this method.

Parameters:

methodInvocation - the current AOP method invocation

Returns:

the RemoteInvocation object

See Also:

RemoteInvocationFactory.createRemoteInvocation(org.aopalliance.intercept.MethodInvocation)