Package jade.core.messaging

Class PersistentDeliveryService

java.lang.Object

jade.core.BaseService

jade.core.messaging.PersistentDeliveryService

All Implemented Interfaces:

Service

public class PersistentDeliveryService
extends BaseService

The JADE service to manage the persistent storage of undelivered ACL messages installed on the platform.

Author:

Giovanni Rimassa - FRAMeTech s.r.l.

Nested Class Summary

Nested classes/interfaces inherited from interface jade.core.Service

Service.Slice, Service.SliceProxy

Field Summary

Fields

Modifier and Type	Field	Description
static String	PERSISTENT_DELIVERY_BASEDIR	This constant is the name of the property whose value contains the root of the directory tree that is used to persist undelivered ACL messages when the file storage method is selected.
static String	PERSISTENT_DELIVERY_FILTER	This constant is the name of the property whose value contains the name of the application-specific class that will be used by the PersistentDeliveryService on the local container as a filter for undelivered ACL messages
static String	PERSISTENT_DELIVERY_SENDFAILUREPERIOD	This constant is the name of the property whose value contains an integer representing how often (in milliseconds) the PersistentDeliveryService will try to send again previously undelivered ACL messages which have been buffered.
static String	PERSISTENT_DELIVERY_STORAGEMETHOD	This constant is the name of the property whose value contains the storage method used to persist undelivered ACL messages by the PersistentDeliveryService on the local container.
static String	PERSISTENT_DELIVERY_STORAGENODES	This constant is the name of the property whose value contains the semicolon separated names of the nodes where messages can be stored.

Fields inherited from class jade.core.BaseService

ALL_DUMP_KEY, MAIN_SLICE, myFinder, myLogger, THIS_SLICE

Fields inherited from interface jade.core.Service

ADOPTED_NODE, DEAD_NODE, DEAD_PLATFORM_MANAGER, DEAD_REPLICA, DEAD_SLICE, NEW_NODE, NEW_REPLICA, NEW_SLICE, REATTACHED, RECONNECTED

Constructor Summary

Constructors

Constructor	Description
PersistentDeliveryService()

Method Summary

Modifier and Type	Method	Description
void	boot(Profile myProfile)	Activate the PersistentDeliveryManager and instantiate the PersistentDeliveryFilter.
Filter	getCommandFilter(boolean direction)	This should be properly implemented by the services that have filters.
Class	getHorizontalInterface()	This should be properly implemented by the services that have non-empty slices.
Service.Slice	getLocalSlice()	This should be properly implemented by the services that have non-empty slices.
String	getName()	Retrieve the name of this service, that can be used to look up its slices in the Service Finder.
void	init(AgentContainer ac, Profile p)	Performs the passive initialization step of the service.

Methods inherited from class jade.core.BaseService

addAlias, broadcast, clearCachedSlice, createInvokator, dump, getAllSlices, getAMSBehaviour, getCommandSink, getFreshSlice, getHelper, getIMTPManager, getLocalNode, getNumberOfSlices, getOwnedCommands, getSlice, isLocal, lookupAlias, shutdown, stringifySlice, submit

Methods inherited from class java.lang.Object

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

Field Detail

PERSISTENT_DELIVERY_FILTER

public static final String PERSISTENT_DELIVERY_FILTER

This constant is the name of the property whose value contains the name of the application-specific class that will be used by the PersistentDeliveryService on the local container as a filter for undelivered ACL messages

See Also:

Constant Field Values

PERSISTENT_DELIVERY_STORAGENODES

public static final String PERSISTENT_DELIVERY_STORAGENODES

This constant is the name of the property whose value contains the semicolon separated names of the nodes where messages can be stored. By default all nodes are considered. This implies that whenever the delivery of a message fails all slices are asked to see if they have a filer that must store the message. Similarly whenever a new agent is created all slices are asked to see if they have messages to flush. When the platform is composed by 100 or more containers (e.g. when there are mobile terminals running split containers) this may be very un-efficient --> using this option to limit the number of slices to be asked is highly recommended

See Also:

Constant Field Values

PERSISTENT_DELIVERY_SENDFAILUREPERIOD

public static final String PERSISTENT_DELIVERY_SENDFAILUREPERIOD

This constant is the name of the property whose value contains an integer representing how often (in milliseconds) the PersistentDeliveryService will try to send again previously undelivered ACL messages which have been buffered.

See Also:

Constant Field Values

PERSISTENT_DELIVERY_STORAGEMETHOD

public static final String PERSISTENT_DELIVERY_STORAGEMETHOD

This constant is the name of the property whose value contains the storage method used to persist undelivered ACL messages by the PersistentDeliveryService on the local container. The supported values for this parameter are:

• file - A directory tree on the local filesystem is used.

If this property is not specified undelivered ACL messages are kept in memory and not persisted at all.

See Also:

Constant Field Values

PERSISTENT_DELIVERY_BASEDIR

public static final String PERSISTENT_DELIVERY_BASEDIR

This constant is the name of the property whose value contains the root of the directory tree that is used to persist undelivered ACL messages when the file storage method is selected.

See Also:

Constant Field Values

Constructor Detail

PersistentDeliveryService

public PersistentDeliveryService()

Method Detail

init

public void init(AgentContainer ac,
                 Profile p)
          throws ProfileException

Description copied from interface: Service

Performs the passive initialization step of the service. This method is called before activating the service. Its role should be simply the one of a constructor, setting up the internal data as needed. Service implementations should not use the Service Manager and Service Finder facilities from within this method. A distributed initialization protocol, if needed, should be exectuted within the boot() method.

Specified by:

init in interface Service

Overrides:

init in class BaseService

Parameters:

ac - The agent container this service is activated on.

p - The configuration profile for this service.

Throws:

ProfileException - If the given profile is not valid.

getName

public String getName()

Description copied from interface: Service

Retrieve the name of this service, that can be used to look up its slices in the Service Finder.

Returns:

The name of this service.

See Also:

ServiceFinder

getHorizontalInterface

public Class getHorizontalInterface()

Description copied from class: BaseService

This should be properly implemented by the services that have non-empty slices.

Specified by:

getHorizontalInterface in interface Service

Overrides:

getHorizontalInterface in class BaseService

Returns:

A Class object, representing the interface that is implemented by the slices of this service. Let s be the Class object corresponding to the Service.Slice interface, and let c be the returned Class object. Then, the two following conditions must hold:

1. c.isInterface() == true
2. s.isAssignableFrom(c) == true

getLocalSlice

public Service.Slice getLocalSlice()

Description copied from class: BaseService

This should be properly implemented by the services that have non-empty slices.

Specified by:

getLocalSlice in interface Service

Overrides:

getLocalSlice in class BaseService

Returns:

The slice of this service that resides on the local platform node, or null if no such slice exists.

getCommandFilter

public Filter getCommandFilter(boolean direction)

Description copied from class: BaseService

This should be properly implemented by the services that have filters. Note that when called multiple times with the same value of the direction parameter this method MUST always return the same object!

Specified by:

getCommandFilter in interface Service

Overrides:

getCommandFilter in class BaseService

Parameters:

direction - One of the two constants Filter.INCOMING and Filter.OUTGOING, distinguishing between the two filter chains managed by the command processor.

Returns:

A Filter object, used by this service to intercept and process kernel-level commands. If the service does not wish to install a command filter for one or both directions, it can just return null when appropriate.

See Also:

CommandProcessor

boot

public void boot(Profile myProfile)
          throws ServiceException

Activate the PersistentDeliveryManager and instantiate the PersistentDeliveryFilter. Note that getting the MessagingService (required to instantiate the PersistentDeliveryManager) cannot be done in the init() method since at that time the MessagingService may not be installed yet.

Specified by:

boot in interface Service

Overrides:

boot in class BaseService

Parameters:

myProfile - The configuration profile for this service.

Throws:

ServiceException - If a problem occurs during service initialization.