## Package net.i2p.router.tunnel

Interface Summary
FragmentHandler.DefragmentedReceiver: Receive messages out of the tunnel endpoint.
IVValidator: Provide a generic interface for IV validation which may be implemented through something as simple as a hashtable or more a complicated bloom filter.
TunnelGateway.QueuePreprocessor
TunnelGateway.Receiver
TunnelGateway.Sender

Class Summary
BatchedPreprocessor: Batching preprocessor that will briefly delay the sending of a message if it doesn't fill up a full tunnel message, in which case it queues up an additional flush task.
BatchedRouterPreprocessor: Honor the 'batchFrequency' tunnel pool setting or the 'router.batchFrequency' router config setting, and track fragmentation.
BloomFilterIVValidator: Manage the IV validation for all of the router's tunnels by way of a big decaying bloom filter.
BuildMessageGenerator
BuildMessageProcessor: Receive the build message at a certain hop, decrypt its encrypted record, read the enclosed tunnel request, decide how to reply, write the reply, encrypt the reply record, and return a TunnelBuildMessage to forward on to the next hop
BuildMessageTest: Simple test to create an encrypted TunnelBuildMessage, decrypt its layers (as it would be during transmission), inject replies, then handle the TunnelBuildReplyMessage (unwrapping the reply encryption and reading the replies).
BuildReplyHandler: Decrypt the layers of a tunnel build reply message, determining whether the individual hops agreed to participate in the tunnel, or if not, why not.
DummyValidator: accept everything
FlushTimer
FragmentedMessage: Gather fragments of I2NPMessages at a tunnel endpoint, making them available for reading when complete.
FragmentHandler: Handle fragments at the endpoint of a tunnel, peeling off fully completed I2NPMessages when they arrive, and dropping fragments if they take too long to arrive.
HashSetIVValidator: waste lots of RAM
HopConfig: Defines the general configuration for a hop in a tunnel.
HopProcessor: Take a received tunnel message, verify that it isn't a duplicate, and translate it into what the next hop will want.
InboundEndpointProcessor: Receive the inbound tunnel message, removing all of the layers added by earlier hops to recover the preprocessed data sent by the gateway.
InboundGatewayProcessor: Override the hop processor to seed the message with a random IV.
InboundGatewayReceiver
InboundMessageDistributor: When a message arrives at the inbound tunnel endpoint, this distributor honors the instructions (safely)
InboundSender: Receive the preprocessed data for an inbound gateway, encrypt it, and forward it on to the first hop.
OutboundGatewayProcessor: Turn the preprocessed tunnel data into something that can be delivered to the first hop in the tunnel.
OutboundMessageDistributor: When a message arrives at the outbound tunnel endpoint, this distributor honors the instructions.
OutboundReceiver: Receive the outbound message after it has been preprocessed and encrypted, then forward it on to the first hop in the tunnel.
OutboundSender: Receive the preprocessed data for an outbound gateway, encrypt all of the layers, and forward it on to the first hop.
OutboundTunnelEndpoint: We are the end of an outbound tunnel that we did not create.
RouterFragmentHandler: Minor extension to allow message history integration
TrivialPreprocessor: Do the simplest thing possible for preprocessing - for each message available, turn it into the minimum number of fragmented preprocessed blocks, sending each of those out.
TrivialRouterPreprocessor: Minor extension to track fragmentation
TunnelCreatorConfig: Coordinate the info that the tunnel creator keeps track of, including what peers are in the tunnel and what their configuration is
TunnelDispatcher: Handle the actual processing and forwarding of messages through the various tunnels.
TunnelGateway: Serve as the gatekeeper for a tunnel, accepting messages, coallescing and/or fragmenting them before wrapping them up for tunnel delivery.
TunnelGateway.Pending
TunnelGatewayZeroHop: Serve as the gatekeeper for a tunnel with no hops.
TunnelParticipant: Participate in a tunnel at a location other than the gateway or outbound endpoint.