org.jcsp.net.dynamic
Class DynamicClassLoader

java.lang.Object
  org.jcsp.net.dynamic.DynamicClassLoader

All Implemented Interfaces:

Service

public class DynamicClassLoader
extends Object
implements Service

A service implementation for supporting dynamic class transfer at a node. When started, JFTP server and ClassMananger processes will be spawned and send/receive filters created. To support dynamic class loading over a given channel, plug the TX filter into the sending end and the RX filter into the receiving end. The channel can then be used normally.

Author:

Quickstone Technologies Limited

Nested Class Summary

class

DynamicClassLoader.DynamicClassLoaderUserObject User interface to obtain the TX and RX filters from the service once it has been started.

Field Summary

static String

name Default service name.

Constructor Summary

DynamicClassLoader()

Method Summary

Filter	getChannelRxFilter() Returns the RX filter to be used at the receiving end of a channel if dynamic class loading is to be supported over that channel.
Filter	getChannelTxFilter() Returns the TX filter to be used at the sending end of a channel if dynamic class loading is to be supported over that channel.
static Filter	getNonDynamicClassLoadingRxFilter() An alternative RX filter that does not support dynamic class loading but will properly unmarshal objects wrapped up by a TX filter.
ServiceUserObject	getUserObject() Returns the service user object.
boolean	init(ServiceSettings settings) Initializes the dynamic loader service.
boolean	isRunning() Returns true iff the service is running.
boolean	start() Starts the dynamic loader service by spawning ClassManager and JFTP processes.
boolean	stop() Stops the dynamic loader service.

Methods inherited from class java.lang.Object

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

Field Detail

name

public static final String name

Default service name.

See Also:

Constant Field Values

Constructor Detail

DynamicClassLoader

public DynamicClassLoader()

Method Detail

start

public boolean start()

Starts the dynamic loader service by spawning ClassManager and JFTP processes.

Specified by:

start in interface Service

Returns:

true if the service started successfully.

stop

public boolean stop()

Stops the dynamic loader service.

Specified by:

stop in interface Service

Returns:

true iff the service has successfully stopped.

init

public boolean init(ServiceSettings settings)

Initializes the dynamic loader service.

Specified by:

init in interface Service

Parameters:

settings - The settings used by the service.

Returns:

true iff the service has been initialized.

isRunning

public boolean isRunning()

Returns true iff the service is running.

Specified by:

isRunning in interface Service

Returns:

true iff the service is currently running.

getUserObject

public ServiceUserObject getUserObject()
                                throws SecurityException

Returns the service user object.

Specified by:

getUserObject in interface Service

Returns:

a ServiceUserObject.

Throws:

SecurityException - if the calling Thread does not have access to the object.

getChannelTxFilter

public Filter getChannelTxFilter()

Returns the TX filter to be used at the sending end of a channel if dynamic class loading is to be supported over that channel. If there is a TX filter at the sending end, there must be a RX filter at the receiving end.

getChannelRxFilter

public Filter getChannelRxFilter()

Returns the RX filter to be used at the receiving end of a channel if dynamic class loading is to be supported over that channel. The filter returned is safe to use if there is no TX filter at the sending end.

getNonDynamicClassLoadingRxFilter

public static Filter getNonDynamicClassLoadingRxFilter()

An alternative RX filter that does not support dynamic class loading but will properly unmarshal objects wrapped up by a TX filter.