rice.p2p.past.gc
Class GCEndpoint

java.lang.Object
  rice.p2p.past.gc.GCEndpoint

All Implemented Interfaces:

Endpoint, NodeHandleReader

public class GCEndpoint
extends java.lang.Object
implements Endpoint

Version:

$Id: GCEndpoint.java 4654 2009-01-08 16:33:07Z jeffh $

Author:

Alan Mislove

Field Summary

protected Endpoint

endpoint The node which this mulitring node is wrapping

Constructor Summary

protected

GCEndpoint(Endpoint endpoint) Constructor

Method Summary

void	accept(AppSocketReceiver receiver) Set's the acceptor for this application.
NodeHandle	coalesce(NodeHandle handle)
void	connect(NodeHandle handle, AppSocketReceiver receiver, int timeout) Passthrough to the sub endpoint.
MessageDeserializer	getDeserializer() Returns the deserializer.
Environment	getEnvironment() Returns the environment.
Id	getId() Returns this node's id, which is its identifier in the namespace.
java.lang.String	getInstance() Returns a unique instance name of this endpoint, sort of a mailbox name for this application.
NodeHandle	getLocalNodeHandle() Returns a handle to the local node below this endpoint.
boolean	isAlive(NodeHandle nh)
NodeHandleSet	localLookup(Id id, int num, boolean safe) This call produces a list of nodes that can be used as next hops on a route towards the given id, such that the resulting route satisfies the overlay protocol's bounds on the number of hops taken.
NodeHandleSet	neighborSet(int num) This methods returns an unordered set of nodehandles on which are neighbors of the local node in the id space.
java.util.List<NodeHandle>	networkNeighbors(int num) Returns an ordered list of the nearest known neighbors.
void	process(Executable task, Continuation command) Schedules a job for processing on the dedicated processing thread.
int	proximity(NodeHandle nh) This replaces NodeHandle.proximity(), so that you don't have to have a "coalesced" NodeHandle.
IdRange	range(NodeHandle handle, int rank, Id lkey) This operation provides information about ranges of keys for which the node is currently a rank-root.
IdRange	range(NodeHandle handle, int rank, Id lkey, boolean cumulative) This operation provides information about ranges of keys for which the node is currently a rank-root.
Id	readId(InputBuffer buf, short type) To use a more efficient serialization format than Java Serialization
IdRange	readIdRange(InputBuffer buf) To use Raw Serialization
NodeHandle	readNodeHandle(InputBuffer buf) To use Raw Serialization
NodeHandleSet	readNodeHandleSet(InputBuffer buf, short type)
void	register() Call this after you have set up your Endpoint: called setDeserializer(), called accept().
NodeHandleSet	replicaSet(Id id, int maxRank) This methods returns an ordered set of nodehandles on which replicas of an object with a given id can be stored.
NodeHandleSet	replicaSet(Id id, int maxRank, NodeHandle root, NodeHandleSet set) This methods returns an ordered set of nodehandles on which replicas of an object with a given id can be stored.
MessageReceipt	route(Id id, Message message, NodeHandle hint) This method makes an attempt to route the message to the root of the given id.
MessageReceipt	route(Id id, Message message, NodeHandle hint, DeliveryNotification deliverAckToMe)
MessageReceipt	route(Id id, Message message, NodeHandle hint, DeliveryNotification deliverAckToMe, java.util.Map<java.lang.String,java.lang.Object> options) This method makes an attempt to route the message to the root of the given id.
MessageReceipt	route(Id id, RawMessage message, NodeHandle hint)
MessageReceipt	route(Id id, RawMessage message, NodeHandle hint, DeliveryNotification deliverAckToMe)
MessageReceipt	route(Id id, RawMessage message, NodeHandle hint, DeliveryNotification deliverAckToMe, java.util.Map<java.lang.String,java.lang.Object> options) Same as the other call, but uses the Raw serialization rather than java serialization.
boolean	routingConsistentFor(Id id) Can we guarantee that this id is currently ours, and routing will be consistent? Note that this has some real timing implications, so don't cache the returned value.
CancellableTask	scheduleMessage(Message message, long delay) Schedules a message to be delivered to this application after the provided number of milliseconds.
CancellableTask	scheduleMessage(Message message, long delay, long period) Schedules a message to be delivered to this application every period number of milliseconds, after delay number of miliseconds have passed.
CancellableTask	scheduleMessageAtFixedRate(Message message, long delay, long period) Schedules a message to be delivered to this application every period number of milliseconds, after delay number of miliseconds have passed.
void	setConsistentRouting(boolean val) default value is true Consistent routing causes RouteMessages to be dropped if we are not sure that we are responsible for our current id range.
void	setDeserializer(MessageDeserializer md) To use a more efficient serialization format than Java Serialization
void	setSendOptions(java.util.Map<java.lang.String,java.lang.Object> options) Uses these options as defaults.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

endpoint

protected Endpoint endpoint

The node which this mulitring node is wrapping

Constructor Detail

GCEndpoint

protected GCEndpoint(Endpoint endpoint)

Constructor

Parameters:

node - The node to base this node off of

Method Detail

getId

public Id getId()

Returns this node's id, which is its identifier in the namespace.

Specified by:

getId in interface Endpoint

Returns:

The local node's id

route

public MessageReceipt route(Id id,
                            Message message,
                            NodeHandle hint)

This method makes an attempt to route the message to the root of the given id. The hint handle will be the first hop in the route. If the id field is null, then the message is routed directly to the given node, and delivers the message there. If the hint field is null, then this method makes an attempt to route the message to the root of the given id. Note that one of the id and hint fields can be null, but not both.

Specified by:

route in interface Endpoint

Parameters:

id - The destination Id of the message.

message - The message to deliver

hint - The first node to send this message to, optional

route

public MessageReceipt route(Id id,
                            RawMessage message,
                            NodeHandle hint)

Specified by:

route in interface Endpoint

route

public MessageReceipt route(Id id,
                            Message message,
                            NodeHandle hint,
                            DeliveryNotification deliverAckToMe)

Specified by:

route in interface Endpoint

route

public MessageReceipt route(Id id,
                            RawMessage message,
                            NodeHandle hint,
                            DeliveryNotification deliverAckToMe)

Specified by:

route in interface Endpoint

route

public MessageReceipt route(Id id,
                            Message message,
                            NodeHandle hint,
                            DeliveryNotification deliverAckToMe,
                            java.util.Map<java.lang.String,java.lang.Object> options)

Description copied from interface: Endpoint

This method makes an attempt to route the message to the root of the given id. The hint handle will be the first hop in the route. If the id field is null, then the message is routed directly to the given node, and delivers the message there. If the hint field is null, then this method makes an attempt to route the message to the root of the given id. Note that one of the id and hint fields can be null, but not both.

Specified by:

route in interface Endpoint

Parameters:

id - The destination Id of the message.

message - The message to deliver

hint - The first node to send this message to, optional

deliverAckToMe - notified when the message is sent

Returns:

can cancel the request

route

public MessageReceipt route(Id id,
                            RawMessage message,
                            NodeHandle hint,
                            DeliveryNotification deliverAckToMe,
                            java.util.Map<java.lang.String,java.lang.Object> options)

Description copied from interface: Endpoint

Same as the other call, but uses the Raw serialization rather than java serialization.

Specified by:

route in interface Endpoint

localLookup

public NodeHandleSet localLookup(Id id,
                                 int num,
                                 boolean safe)

This call produces a list of nodes that can be used as next hops on a route towards the given id, such that the resulting route satisfies the overlay protocol's bounds on the number of hops taken. If the safe flag is specified, then the fraction of faulty nodes returned is no higher than the fraction of faulty nodes in the overlay.

Specified by:

localLookup in interface Endpoint

Parameters:

id - The destination id.

num - The number of nodes to return.

safe - Whether or not to return safe nodes.

neighborSet

public NodeHandleSet neighborSet(int num)

This methods returns an unordered set of nodehandles on which are neighbors of the local node in the id space. Up to num handles are returned.

Specified by:

neighborSet in interface Endpoint

Parameters:

num - The number of desired handle to return.

replicaSet

public NodeHandleSet replicaSet(Id id,
                                int maxRank)

This methods returns an ordered set of nodehandles on which replicas of an object with a given id can be stored. The call returns nodes up to and including a node with maxRank.

Specified by:

replicaSet in interface Endpoint

Parameters:

id - The object's id.

maxRank - The number of desired replicas.

replicaSet

public NodeHandleSet replicaSet(Id id,
                                int maxRank,
                                NodeHandle root,
                                NodeHandleSet set)

This methods returns an ordered set of nodehandles on which replicas of an object with a given id can be stored. The call returns nodes up to and including a node with maxRank. This call also allows the application to provide a remove "center" node, as well as other nodes in the vicinity.

Specified by:

replicaSet in interface Endpoint

Parameters:

id - The object's id.

maxRank - The number of desired replicas.

handle - The root handle of the remove set

set - The set of other nodes around the root handle

range

public IdRange range(NodeHandle handle,
                     int rank,
                     Id lkey)

This operation provides information about ranges of keys for which the node is currently a rank-root. The operations returns null if the range could not be determined, the range otherwise. It is an error to query the range of a node not present in the neighbor set as returned bythe update upcall or the neighborSet call. Certain implementations may return an error if rank is greater than zero. Some protocols may have multiple, disjoint ranges of keys for which a given node is responsible. The parameter lkey allows the caller to specify which region should be returned. If the node referenced by is responsible for key lkey, then the resulting range includes lkey. Otherwise, the result is the nearest range clockwise from lkey for which is responsible.

Specified by:

range in interface Endpoint

Parameters:

handle - The handle whose range to check.

rank - The root rank.

lkey - An "index" in case of multiple ranges.

range

public IdRange range(NodeHandle handle,
                     int rank,
                     Id lkey,
                     boolean cumulative)

This operation provides information about ranges of keys for which the node is currently a rank-root. The operations returns null if the range could not be determined, the range otherwise. It is an error to query the range of a node not present in the neighbor set as returned bythe update upcall or the neighborSet call. Certain implementations may return an error if rank is greater than zero. Some protocols may have multiple, disjoint ranges of keys for which a given node is responsible. The parameter lkey allows the caller to specify which region should be returned. If the node referenced by is responsible for key lkey, then the resulting range includes lkey. Otherwise, the result is the nearest range clockwise from lkey for which is responsible.

Specified by:

range in interface Endpoint

Parameters:

handle - The handle whose range to check.

rank - The root rank.

lkey - An "index" in case of multiple ranges.

cumulative - Whether to return the cumulative or single range

getLocalNodeHandle

public NodeHandle getLocalNodeHandle()

Returns a handle to the local node below this endpoint. This node handle is serializable, and can therefore be sent to other nodes in the network and still be valid.

Specified by:

getLocalNodeHandle in interface Endpoint

Returns:

A NodeHandle referring to the local node.

networkNeighbors

public java.util.List<NodeHandle> networkNeighbors(int num)

Description copied from interface: Endpoint

Returns an ordered list of the nearest known neighbors. Note that proximity is usually an estimate, and can quickly become stale.

Specified by:

networkNeighbors in interface Endpoint

Returns:

List of NodeHandle

scheduleMessage

public CancellableTask scheduleMessage(Message message,
                                       long delay)

Schedules a message to be delivered to this application after the provided number of milliseconds.

Specified by:

scheduleMessage in interface Endpoint

Parameters:

message - The message to be delivered

delay - The number of milliseconds to wait before delivering the message

scheduleMessage

public CancellableTask scheduleMessage(Message message,
                                       long delay,
                                       long period)

Schedules a message to be delivered to this application every period number of milliseconds, after delay number of miliseconds have passed.

Specified by:

scheduleMessage in interface Endpoint

Parameters:

message - The message to be delivered

delay - The number of milliseconds to wait before delivering the fist message

delay - The number of milliseconds to wait before delivering subsequent messages

scheduleMessageAtFixedRate

public CancellableTask scheduleMessageAtFixedRate(Message message,
                                                  long delay,
                                                  long period)

Description copied from interface: Endpoint

Schedules a message to be delivered to this application every period number of milliseconds, after delay number of miliseconds have passed.

Specified by:

scheduleMessageAtFixedRate in interface Endpoint

Parameters:

message - The message to be delivered

delay - The number of milliseconds to wait before delivering the fist message

process

public void process(Executable task,
                    Continuation command)

Schedules a job for processing on the dedicated processing thread. CPU intensive jobs, such as encryption, erasure encoding, or bloom filter creation should never be done in the context of the underlying node's thread, and should only be done via this method.

Specified by:

process in interface Endpoint

Parameters:

task - The task to run on the processing thread

command - The command to return the result to once it's done

getInstance

public java.lang.String getInstance()

Returns a unique instance name of this endpoint, sort of a mailbox name for this application.

Specified by:

getInstance in interface Endpoint

Returns:

The unique instance name of this application

getEnvironment

public Environment getEnvironment()

Description copied from interface: Endpoint

Returns the environment. This allows the nodes to be virtualized within the JVM

Specified by:

getEnvironment in interface Endpoint

Returns:

the environment for this node/app.

connect

public void connect(NodeHandle handle,
                    AppSocketReceiver receiver,
                    int timeout)

Passthrough to the sub endpoint.

Specified by:

connect in interface Endpoint

receiver - calls receiveSocket() when a new AppSocket is opened to this application on a remote node.

accept

public void accept(AppSocketReceiver receiver)

Description copied from interface: Endpoint

Set's the acceptor for this application. If no acceptor is set, then when a remote node's application opens a socket here, they will get an *Exception*

Specified by:

accept in interface Endpoint

Parameters:

receiver - calls receiveSocket() when a new AppSocket is opened to this application from a remote node. Note that you must call accept() again after each socket is received to properly handle socket backlogging

setDeserializer

public void setDeserializer(MessageDeserializer md)

Description copied from interface: Endpoint

To use a more efficient serialization format than Java Serialization

Specified by:

setDeserializer in interface Endpoint

getDeserializer

public MessageDeserializer getDeserializer()

Description copied from interface: Endpoint

Returns the deserializer. The default deserializer can deserialize rice.p2p.util.JavaSerializedMessage

Specified by:

getDeserializer in interface Endpoint

Returns:

readId

public Id readId(InputBuffer buf,
                 short type)
          throws java.io.IOException

Description copied from interface: Endpoint

To use a more efficient serialization format than Java Serialization

Specified by:

readId in interface Endpoint

Throws:

java.io.IOException

readNodeHandle

public NodeHandle readNodeHandle(InputBuffer buf)
                          throws java.io.IOException

Description copied from interface: NodeHandleReader

To use Raw Serialization

Specified by:

readNodeHandle in interface Endpoint

Specified by:

readNodeHandle in interface NodeHandleReader

Returns:

Throws:

java.io.IOException

readIdRange

public IdRange readIdRange(InputBuffer buf)
                    throws java.io.IOException

Description copied from interface: Endpoint

To use Raw Serialization

Specified by:

readIdRange in interface Endpoint

Returns:

Throws:

java.io.IOException

coalesce

public NodeHandle coalesce(NodeHandle handle)

Specified by:

coalesce in interface NodeHandleReader

readNodeHandleSet

public NodeHandleSet readNodeHandleSet(InputBuffer buf,
                                       short type)
                                throws java.io.IOException

Specified by:

readNodeHandleSet in interface Endpoint

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

register

public void register()

Description copied from interface: Endpoint

Call this after you have set up your Endpoint: called setDeserializer(), called accept().

Specified by:

register in interface Endpoint

proximity

public int proximity(NodeHandle nh)

Description copied from interface: Endpoint

This replaces NodeHandle.proximity(), so that you don't have to have a "coalesced" NodeHandle.

Specified by:

proximity in interface Endpoint

Returns:

isAlive

public boolean isAlive(NodeHandle nh)

Specified by:

isAlive in interface Endpoint

setConsistentRouting

public void setConsistentRouting(boolean val)

Description copied from interface: Endpoint

default value is true Consistent routing causes RouteMessages to be dropped if we are not sure that we are responsible for our current id range. If you set this to false, you will be delivered messages to forward() and deliver() even if there is possible inconsistent routing. (The overlay still does it's best to deliver the RouteMessage to the proper key, but some protocols can guarantee consistency, for example by using leases between nodes) Note that when true, the overlay never purposely drops messages routed with a null key: endpoint.deliver(null, msg, targetNodeHandle) // will be delivered regardless of consistency

Specified by:

setConsistentRouting in interface Endpoint

routingConsistentFor

public boolean routingConsistentFor(Id id)

Description copied from interface: Endpoint

Can we guarantee that this id is currently ours, and routing will be consistent? Note that this has some real timing implications, so don't cache the returned value. Note that it will always return always returns false if you are not the root of the id.

Specified by:

routingConsistentFor in interface Endpoint

Returns:

true if routing consistency can currently be guaranteed for this

setSendOptions

public void setSendOptions(java.util.Map<java.lang.String,java.lang.Object> options)

Description copied from interface: Endpoint

Uses these options as defaults.

Specified by:

setSendOptions in interface Endpoint