Rice Pastry API

rice.pastry.client
Class PastryAppl

java.lang.Object
  extended by rice.pastry.client.PastryAppl
Direct Known Subclasses:
CommonAPIAppl, FetchLeafsetApp, HelloWorldApp, PastryEndpoint, PeriodicLeafSetProtocol, Ping, PingClient, PNSApplication, ProbeApp, RendezvousApp, StandardJoinProtocol, StandardLeafSetProtocol, StandardRouter, StandardRouteSetProtocol

public abstract class PastryAppl
extends java.lang.Object

A PastryAppl is an abstract class that every Pastry application extends. This is the external Pastry API.

Version:
$Id: PastryAppl.java 4226 2008-05-28 14:56:19Z jeffh $
Author:
Peter Druschel

Field Summary
protected  int address
           
protected  MessageDeserializer deserializer
           
protected  java.lang.String instance
           
protected  Logger logger
           
protected  java.util.Map<java.lang.String,java.lang.Object> options
           
protected  AppSocketReceiver receiver
          holds the receiverSocket
protected  PastryNode thePastryNode
           
 
Constructor Summary
PastryAppl(PastryNode pn)
          Constructor.
PastryAppl(PastryNode pn, int port)
          Constructor.
PastryAppl(PastryNode pn, java.lang.String instance)
          Constructor.
PastryAppl(PastryNode pn, java.lang.String instance, int address, MessageDeserializer md)
           
PastryAppl(PastryNode pn, java.lang.String instance, int address, MessageDeserializer md, Logger logger)
           
 
Method Summary
 void accept(AppSocketReceiver receiver)
          Sets an AppSocketReceiver to be called when the next socket arrives.
 boolean canReceiveSocket()
          Calls receiver.receiveSocket(), then sets receiver to null.
 void connect(NodeHandle handle, AppSocketReceiver receiver, int timeout)
          Called to open an ApplicationLevelSocket
 boolean deliverWhenNotReady()
          Instructs the MessageDispatch how to behave when the PastryNode is not ready.
 void destroy()
          Called when PastryNode is destroyed.
 boolean enrouteMessage(Message msg, Id key, NodeHandle nextHop, SendOptions opt)
          Called by pastry when a message is enroute and is passing through this node.
 void finishReceiveSocket(AppSocket socket)
           
 int getAddress()
          Returns the address of this application.
 MessageDeserializer getDeserializer()
           
 LeafSet getLeafSet()
          Called by a layered Pastry application to obtain a copy of the leaf set.
 NodeHandle getNodeHandle()
          Gets the handle of the Pastry node associated with this client
 Id getNodeId()
          Gets the node id associated with this client.
 RoutingTable getRoutingTable()
          Called by a layered Pastry application to obtain a copy of the routing table.
 boolean isClosest(Id key)
          Called by the layered Pastry application to check if the local pastry node is the one that is currently closest to the object key id.
 void leafSetChange(NodeHandle nh, boolean wasAdded)
          Called by pastry when the leaf set changes.
abstract  void messageForAppl(Message msg)
          Called by pastry when a message arrives for this application.
 void notifyReady()
          Invoked when the Pastry node has joined the overlay network and is ready to send and receive messages As of FreePastry 1.4.1, replaced by PastryNode Observer pattern.
 void receiveMessage(Message msg)
          Called by pastry to deliver a message to this client.
 void receiveMessageInternal(RawMessageDelivery msg)
           
 void register()
           
 void routeMsg(Id key, Message msg, SendOptions opt)
          Routes a message to the live node D with nodeId numerically closest to key (at the time of delivery).
 MessageReceipt routeMsg(Id key, Message msg, SendOptions opt, DeliveryNotification deliverAckToMe)
           
 boolean routeMsgDirect(NodeHandle dest, Message msg, SendOptions opt)
          Sends a message to the Pastry node identified by dest.
 void routeSetChange(NodeHandle nh, boolean wasAdded)
          Called by pastry when the route set changes.
protected  void setDeserializer(MessageDeserializer deserializer)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

deserializer

protected MessageDeserializer deserializer

instance

protected java.lang.String instance

thePastryNode

protected PastryNode thePastryNode

address

protected int address

logger

protected Logger logger

options

protected java.util.Map<java.lang.String,java.lang.Object> options

receiver

protected AppSocketReceiver receiver
holds the receiverSocket

Constructor Detail

PastryAppl

public PastryAppl(PastryNode pn)
Constructor.

Parameters:
pn - the pastry node that client will attach to.

PastryAppl

public PastryAppl(PastryNode pn,
                  java.lang.String instance)
Constructor. This constructor will perform the same tasks as the above constructor, but will also create a Pastry address for this application, which is dependent upon the given instance name and the class name.

Parameters:
pn - the pastry node that client will attach to.
instance - The instance name of this appl.

PastryAppl

public PastryAppl(PastryNode pn,
                  java.lang.String instance,
                  int address,
                  MessageDeserializer md)

PastryAppl

public PastryAppl(PastryNode pn,
                  java.lang.String instance,
                  int address,
                  MessageDeserializer md,
                  Logger logger)

PastryAppl

public PastryAppl(PastryNode pn,
                  int port)
Constructor. This constructor will perform the same tasks as the above constructor, but will also create a Pastry address for this application, using the specified port. Need to call register on this.

Parameters:
pn - the pastry node that client will attach to.
instance - The instance name of this appl.
Method Detail

register

public void register()

getAddress

public int getAddress()
Returns the address of this application.

Returns:
the address.

receiveMessageInternal

public void receiveMessageInternal(RawMessageDelivery msg)

setDeserializer

protected void setDeserializer(MessageDeserializer deserializer)

getDeserializer

public MessageDeserializer getDeserializer()

receiveMessage

public void receiveMessage(Message msg)
Called by pastry to deliver a message to this client.

Parameters:
msg - the message that is arriving.

getNodeId

public final Id getNodeId()
Gets the node id associated with this client.

Returns:
the node id.

getNodeHandle

public NodeHandle getNodeHandle()
Gets the handle of the Pastry node associated with this client

Returns:
the node handle

routeMsgDirect

public boolean routeMsgDirect(NodeHandle dest,
                              Message msg,
                              SendOptions opt)
Sends a message to the Pastry node identified by dest. If that node has failed or no point-to-point connection can be established to the node from the local node in the Internet, the operation fails. Note that in this case, it may still be possible to send the message to that node using routeMsg.

Parameters:
dest - the destination node
msg - the message to deliver.
cred - credentials that verify the authenticity of the message.
opt - send options that describe how the message is to be routed.

routeMsg

public void routeMsg(Id key,
                     Message msg,
                     SendOptions opt)
Routes a message to the live node D with nodeId numerically closest to key (at the time of delivery). The message is delivered to the application with address addr at D, and at each Pastry node encountered along the route to D.

Parameters:
key - the key
msg - the message to deliver.
cred - credentials that verify the authenticity of the message.
opt - send options that describe how the message is to be routed.

routeMsg

public MessageReceipt routeMsg(Id key,
                               Message msg,
                               SendOptions opt,
                               DeliveryNotification deliverAckToMe)

getLeafSet

public LeafSet getLeafSet()
Called by a layered Pastry application to obtain a copy of the leaf set. The leaf set contains the nodeId to IP address binding of the l/2 nodes with numerically closest counterclockwise and the l/2 nodes with numerically closest clockwise nodeIds, relatively to the local node's id.

Returns:
the local node's leaf set

getRoutingTable

public RoutingTable getRoutingTable()
Called by a layered Pastry application to obtain a copy of the routing table. The routing table contains the nodeId to IP address bindings of R nodes that share the local node's id in the first n digits, and differ in the n+1th digit, for 0 <= n <= ceiling(log_2^b N), where N is the total number of currently live nodes in the Pastry network. The routing table may be incomplete, may contain nodes that cannot be reached from the local node or have failed, and the table may change at any time.


isClosest

public boolean isClosest(Id key)
Called by the layered Pastry application to check if the local pastry node is the one that is currently closest to the object key id.

Parameters:
key - the object key id
Returns:
true if the local node is currently the closest to the key.

messageForAppl

public abstract void messageForAppl(Message msg)
Called by pastry when a message arrives for this application.

Parameters:
msg - the message that is arriving.

enrouteMessage

public boolean enrouteMessage(Message msg,
                              Id key,
                              NodeHandle nextHop,
                              SendOptions opt)
Called by pastry when a message is enroute and is passing through this node. If this method is not overridden, the default behaviour is to let the message pass through.

Parameters:
msg - the message that is passing through.
key - the key
nextHop - the default next hop for the message.
opt - the send options the message was sent with.
Returns:
true if the message should be routed, false if the message should be cancelled.

leafSetChange

public void leafSetChange(NodeHandle nh,
                          boolean wasAdded)
Called by pastry when the leaf set changes.

Parameters:
nh - the handle of the node that was added or removed.
wasAdded - true if the node was added, false if the node was removed.

routeSetChange

public void routeSetChange(NodeHandle nh,
                           boolean wasAdded)
Called by pastry when the route set changes.

Parameters:
nh - the handle of the node that was added or removed.
wasAdded - true if the node was added, false if the node was removed.

notifyReady

public void notifyReady()
Invoked when the Pastry node has joined the overlay network and is ready to send and receive messages As of FreePastry 1.4.1, replaced by PastryNode Observer pattern.


deliverWhenNotReady

public boolean deliverWhenNotReady()
Instructs the MessageDispatch how to behave when the PastryNode is not ready. An application can override this method to return true if it wishes to receive messages before Pastry is ready(). Most applications should leave this as false, so that their application does not have inconsistent routing. However Pastry's protocols (such as the join protocol) need to receive messages before pastry is ready(). This is because they are attempting to make pastry ready().

Returns:
false unless the node is a service

destroy

public void destroy()
Called when PastryNode is destroyed. Can be overloaded by applications.


connect

public void connect(NodeHandle handle,
                    AppSocketReceiver receiver,
                    int timeout)
Called to open an ApplicationLevelSocket


accept

public void accept(AppSocketReceiver receiver)
Sets an AppSocketReceiver to be called when the next socket arrives.

Parameters:
receiver -

canReceiveSocket

public boolean canReceiveSocket()
Calls receiver.receiveSocket(), then sets receiver to null. It sets it to null to allow the application to provide SocketInitiationBackpressure

Parameters:
socket - the new socket from the network
Returns:
false if receiver was null, true receiveSocket() was called

finishReceiveSocket

public void finishReceiveSocket(AppSocket socket)
                         throws java.io.IOException
Throws:
java.io.IOException

Rice Pastry API

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