Package net.i2p.router.transport.ntcp

The NTCP (New TCP) transport for I2P, allowing I2P messages to be passed over TCP connections.

See: Description

Interface Summary

Interface	Description
EstablishState	Interface for handling NTCP connection establishment state machine.
NTCP2Payload.PayloadCallback	For all callbacks, recommend throwing exceptions only from the handshake.

Class Summary

Class	Description
EstablishBase	Base class for NTCP connection establishment.
EventPumper	The main NTCP NIO event loop thread responsible for high-throughput, low-latency handling of inbound and outbound NTCP connections using non-blocking I/O.
InboundEstablishState	NTCP 2 inbound connection establishment state machine.
NTCP2Options	NTCP2 Padding/Dummy/Delay configuration for data phase.
NTCP2Payload	NTCP 2 payload generation and parsing utilities.
NTCP2Payload.Block	Base class for NTCP 2 payload blocks.
NTCP2Payload.DateTimeBlock	Block containing the current date and time.
NTCP2Payload.I2NPBlock	Block containing I2NP message.
NTCP2Payload.OptionsBlock	Block containing options data.
NTCP2Payload.PaddingBlock	Block containing padding data.
NTCP2Payload.RIBlock	Block containing router information.
NTCP2Payload.TerminationBlock	Block containing termination data.
NTCPConnection	Coordinates a connection to a single peer using NTCP 1 or NTCP 2 protocols.
NTCPConnection.PrepBuffer	Buffer for preparing data to be written to the connection.
NTCPSendFinisher	Handles asynchronous post-send processing of OutNetMessage using a fixed-size thread pool executor with a bounded queue and backpressure.
NTCPTransport	Non-blocking TCP (NTCP) transport implementation for I2P.
OutboundNTCP2State	NTCP 2 only.
Reader	Pool of running threads which will process any read bytes on any of the NTCPConnections, including decryption of the data read, connection handshaking, parsing bytes into I2NP messages, etc.
Writer	Pool of running threads which will transform the next I2NP message into something ready to be transferred over an NTCP connection, including encryption of the data read.

Enum Summary

Enum	Description
EstablishBase.State	States for NTCP connection establishment process.

Package net.i2p.router.transport.ntcp Description

The NTCP (New TCP) transport for I2P, allowing I2P messages to be passed over TCP connections. NTCP replaces an older TCP transport that had congestion issues.

This package provides:

• TCP-based peer connections
• Reliable ordered delivery of I2P messages
• Transport establishment and authentication
• Connection management and pooling
• Network address translation (NAT) support

NTCP is one of the primary transport protocols used by I2P, providing reliable communication suitable for environments where UDP may be blocked or filtered.