Package net.i2p.router.tunnel

Class PumpedTunnelGateway

java.lang.Object

net.i2p.router.tunnel.TunnelGateway

net.i2p.router.tunnel.PumpedTunnelGateway

Direct Known Subclasses:

ThrottledPumpedTunnelGateway

class PumpedTunnelGateway
extends TunnelGateway

This is used for all gateways with more than zero hops. Serve as the gatekeeper for a tunnel, accepting messages, coallescing and/or fragmenting them before wrapping them up for tunnel delivery. The flow here is:

1. add an I2NPMessage (and a target tunnel/router, if necessary)
2. that message is queued up into a TunnelGateway.Pending and offered to the assigned QueuePreprocessor.
3. that QueuePreprocessor may then take off any of the TunnelGateway.Pending messages or instruct the TunnelGateway to offer it the messages again in a short while (in an attempt to coallesce them).
4. when the QueueProcessor accepts a TunnelGateway.Pending, it preprocesses it into fragments, forwarding each preprocessed fragment group through the Sender.
5. the Sender then encrypts the preprocessed data and delivers it to the Receiver.
6. the Receiver now has the encrypted message and may do with it as it pleases (e.g. wrap it as necessary and enqueue it onto the OutNetMessagePool, or if debugging, verify that it can be decrypted properly)

Nested Class Summary

Nested classes/interfaces inherited from class net.i2p.router.tunnel.TunnelGateway

TunnelGateway.DelayedFlush, TunnelGateway.QueuePreprocessor, TunnelGateway.Receiver, TunnelGateway.Sender

Field Summary

Fields inherited from class net.i2p.router.tunnel.TunnelGateway

_context, _delayedFlush, _lastFlush, _log, _messagesSent, _preprocessor, _queue, _receiver, _sender

Constructor Summary

Constructors

Constructor	Description
PumpedTunnelGateway(RouterContext context, TunnelGateway.QueuePreprocessor preprocessor, TunnelGateway.Sender sender, TunnelGateway.Receiver receiver, TunnelGatewayPumper pumper)

Method Summary

Modifier and Type	Method	Description
void	add(I2NPMessage msg, Hash toRouter, TunnelId toTunnel)	Add a message to be sent down the tunnel, either sending it now (perhaps coallesced with other pending messages) or after a brief pause (_flushFrequency).
protected void	add(PendingGatewayMessage cur)
boolean	pump(List<PendingGatewayMessage> queueBuf)	run in one of the TunnelGatewayPumper's threads, this pulls pending messages off the prequeue, adds them to the queue and then tries to preprocess the queue, scheduling a later delayed flush as necessary.

Methods inherited from class net.i2p.router.tunnel.TunnelGateway

add, getMessagesSent

Methods inherited from class java.lang.Object

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

Constructor Details

PumpedTunnelGateway

public PumpedTunnelGateway(RouterContext context,
 TunnelGateway.QueuePreprocessor preprocessor,
 TunnelGateway.Sender sender,
 TunnelGateway.Receiver receiver,
 TunnelGatewayPumper pumper)

Parameters:

preprocessor - this pulls Pending messages off a list, builds some full preprocessed messages, and pumps those into the sender

sender - this takes a preprocessed message, encrypts it, and sends it to the receiver

receiver - this receives the encrypted message and forwards it off to the first hop

Method Details

add

public void add(I2NPMessage msg,
 Hash toRouter,
 TunnelId toTunnel)

Add a message to be sent down the tunnel, either sending it now (perhaps coallesced with other pending messages) or after a brief pause (_flushFrequency). If it is queued up past its expiration, it is silently dropped This is only for OBGWs. See TPTG override for IBGWs.

Overrides:

add in class TunnelGateway

Parameters:

msg - message to be sent through the tunnel

toRouter - router to send to after the endpoint (or null for endpoint processing)

toTunnel - tunnel to send to after the endpoint (or null for endpoint or router processing)

add

protected void add(PendingGatewayMessage cur)

pump

public boolean pump(List<PendingGatewayMessage> queueBuf)

run in one of the TunnelGatewayPumper's threads, this pulls pending messages off the prequeue, adds them to the queue and then tries to preprocess the queue, scheduling a later delayed flush as necessary. this allows the gw.add call to go quickly, rather than blocking its callers on potentially substantial processing.

Parameters:

queueBuf - Empty list for convenience, to use as a temporary buffer. Must be empty when called; will always be emptied before return.

Returns:

true if we did not finish, and the pumper should be requeued.