p2pcm
Class Component

java.lang.Object
  dermi.EventServer
      dermi.DermiRemoteObject
          p2pcm.Component

All Implemented Interfaces:

dermi.listener.RemoteEventListener, java.io.Serializable

public class Component
extends dermi.DermiRemoteObject

This class is the base class for a Dermi Component. It is in fact a special kind of Dermi Remote Object which provides the component's standard methods

Version:

1.2

Author:

Carles Pairot

See Also:

Serialized Form

Field Summary

Fields inherited from class dermi.DermiRemoteObject

logger

Fields inherited from class dermi.EventServer

className, classStore, conn, eref, uid

Constructor Summary

Component()
Default void Dermi Remote Object constructor

Component(java.util.Properties env)
Default Dermi Remote Object constructor

Method Summary

void	activate() This method implements the default activation policy for components It thus follows this algorithm: - Obtain first the node's 5 most suitable replicas - If replica number is less than 2, it is impossible to activate new components (node is isolated) - Identify which node is overwhelming this component, and activate new object replica there, unless there is an already active instance within that node.
ComponentControl	getLifeCycleManager() Life cycle manager getter method
void	passivate() This method implements the default passivation policy for components It now unloads the component from memory.
void	setLifeCycleManager(ComponentControl cc) Life cycle manager setter method

Methods inherited from class dermi.DermiRemoteObject

addListener, anycallEventArrived, close, copy, eventArrived, getReplicaState, init, loadReplicaState, loadState, removeListener, triggerEvent

Methods inherited from class dermi.EventServer

dispatchDirectEvent, dispatchDirectEvent, dispatchEvent, dispatchEvent, dispatchEvent, getBytes, getClassStore, getERef, getUID, start, writeERef

Methods inherited from class java.lang.Object

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

Constructor Detail

Component

public Component()

Default void Dermi Remote Object constructor

Component

public Component(java.util.Properties env)
          throws dermi.exception.RemoteException

Default Dermi Remote Object constructor

Parameters:

env - Properties Object properties

Throws:

dermi.exception.RemoteException - If something goes wrong ;-)

Method Detail

setLifeCycleManager

public void setLifeCycleManager(ComponentControl cc)

Life cycle manager setter method

Parameters:

cc - ComponentControl A previously initialized life cycle manager

getLifeCycleManager

public ComponentControl getLifeCycleManager()

Life cycle manager getter method

Returns:

ComponentControl The component's life cycle manager

activate

public void activate()
              throws ActivationException

This method implements the default activation policy for components It thus follows this algorithm: - Obtain first the node's 5 most suitable replicas - If replica number is less than 2, it is impossible to activate new components (node is isolated) - Identify which node is overwhelming this component, and activate new object replica there, unless there is an already active instance within that node.

Throws:

ActivationException - If impossible to activate new object replica for any reason (see below)

passivate

public void passivate()
               throws PassivationException

This method implements the default passivation policy for components It now unloads the component from memory. Should take care of possible state persistence, which will be implemented in a near future ;-)

Throws:

PassivationException - If the component cannot be passivated.