Package org.drasyl.pipeline

Interface Handler

All Known Subinterfaces:

InboundHandler, OutboundHandler

All Known Implementing Classes:

DuplexHandler, HandlerAdapter, InboundHandlerAdapter, OutboundHandlerAdapter, SimpleInboundHandler, SimpleOutboundHandler, SimplexDuplexHandler

public interface Handler

Handles an I/O event or intercepts an I/O operation, and forwards it to its next handler in its Pipeline.

Sub-types

Handler itself does not provide many methods, but you usually have to implement one of its subtypes:

• InboundHandler to handle inbound I/O events, and
• OutboundHandler to handle outbound I/O operations.

Alternatively, the following adapter classes are provided for your convenience:

• InboundHandlerAdapter to handle inbound I/O events,
• OutboundHandlerAdapter to handle outbound I/O operations, and
• DuplexHandler to handle both inbound and outbound events

The context object

A Handler is provided with a HandlerContext object. A Handler is supposed to interact with the Pipeline it belongs to via a context object. Using the context object, the Handler can pass events upstream or downstream or modify the pipeline dynamically.

Method Summary

Modifier and Type	Method	Description
void	handlerAdded(HandlerContext ctx)	Gets called after the Handler was added to the actual context and it's ready to handle events.
void	handlerRemoved(HandlerContext ctx)	Gets called after the Handler was removed from the actual context and it doesn't handle events anymore.

Method Detail

handlerAdded

void handlerAdded(HandlerContext ctx)

Gets called after the Handler was added to the actual context and it's ready to handle events.

handlerRemoved

void handlerRemoved(HandlerContext ctx)

Gets called after the Handler was removed from the actual context and it doesn't handle events anymore.