org.protelis.test.infrastructure

Class CachingNetworkManager

java.lang.Object

org.protelis.test.infrastructure.CachingNetworkManager

All Implemented Interfaces:

org.protelis.vm.NetworkManager

public class CachingNetworkManager
extends java.lang.Object
implements org.protelis.vm.NetworkManager

Abstraction of networking used by the virtual machine: at each execution round, the VM needs to be able to access the most recent state received from neighbors and to be able to update the state that it is exporting to neighbors. Note, however, that there is no requirement that state actually be sent or received in each round: it is up to the individual implementation of a NetworkManager to best optimize in order to best trade off between effective state sharing and efficiency. This simple implementation just tracks the most recent message sent from this device and the most recent messages received from each neighbor.

Constructor Summary

Constructors

Constructor and Description
CachingNetworkManager()

Method Summary

Modifier and Type	Method and Description
java.util.Map<org.protelis.lang.datatype.DeviceUID,java.util.Map<org.protelis.vm.CodePath,java.lang.Object>>	getNeighborState() Called by ProtelisVM during execution to collect the most recent information available from neighbors.
java.util.Map<org.protelis.vm.CodePath,java.lang.Object>	getSendCache() External access to sending cache.
void	receiveFromNeighbor(org.protelis.lang.datatype.DeviceUID neighbor, java.util.Map<org.protelis.vm.CodePath,java.lang.Object> message) External access to put messages into receive cache.
void	removeNeighbor(org.protelis.lang.datatype.DeviceUID neighbor) External access to note when a device is no longer a neighbor, wiping cache.
void	shareState(java.util.Map<org.protelis.vm.CodePath,java.lang.Object> toSend) Called by ProtelisVM during execution to send its current shared state to neighbors.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingNetworkManager

public CachingNetworkManager()

Method Detail

getSendCache

public java.util.Map<org.protelis.vm.CodePath,java.lang.Object> getSendCache()

External access to sending cache.

Returns:

cache

receiveFromNeighbor

public void receiveFromNeighbor(org.protelis.lang.datatype.DeviceUID neighbor,
                                java.util.Map<org.protelis.vm.CodePath,java.lang.Object> message)

External access to put messages into receive cache.

Parameters:

neighbor - sender

message - messege to be received

removeNeighbor

public void removeNeighbor(org.protelis.lang.datatype.DeviceUID neighbor)

External access to note when a device is no longer a neighbor, wiping cache.

Parameters:

neighbor - to be removed

getNeighborState

public java.util.Map<org.protelis.lang.datatype.DeviceUID,java.util.Map<org.protelis.vm.CodePath,java.lang.Object>> getNeighborState()

Called by ProtelisVM during execution to collect the most recent information available from neighbors. The call is serial within the execution, so this should probably poll state maintained by a separate thread, rather than gathering state during this call.

Specified by:

getNeighborState in interface org.protelis.vm.NetworkManager

Returns:

A map associating each neighbor with its shared state. The object returned should not be modified, and ProtelisVM will not change it either.

shareState

public void shareState(java.util.Map<org.protelis.vm.CodePath,java.lang.Object> toSend)

Called by ProtelisVM during execution to send its current shared state to neighbors. The call is serial within the execution, so this should probably queue up a message to be sent, rather than actually carrying out a lengthy operations during this call.

Specified by:

shareState in interface org.protelis.vm.NetworkManager

Parameters:

toSend - Shared state to be transmitted to neighbors.