SpdyFrameLogger Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/spdy/client/SpdyFrameLogger.java lines 30–76

public class SpdyFrameLogger extends ChannelDuplexHandler {

    private enum Direction {
        INBOUND, OUTBOUND
    }

    protected final InternalLogger logger;
    private final InternalLogLevel level;

    public SpdyFrameLogger(InternalLogLevel level) {
        this.level = ObjectUtil.checkNotNull(level, "level");
        this.logger = InternalLoggerFactory.getInstance(getClass());
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (acceptMessage(msg)) {
            log((SpdyFrame) msg, Direction.INBOUND);
        }
        ctx.fireChannelRead(msg);
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
        if (acceptMessage(msg)) {
            log((SpdyFrame) msg, Direction.OUTBOUND);
        }
        ctx.write(msg, promise);
    }

    private static boolean acceptMessage(Object msg) {
        return msg instanceof SpdyFrame;
    }

    private void log(SpdyFrame msg, Direction d) {
        if (logger.isEnabled(level)) {
            StringBuilder b = new StringBuilder(200)
                .append("\n----------------")
                .append(d.name())
                .append("--------------------\n")
                .append(msg)
                .append("\n------------------------------------");

            logger.log(level, b.toString());
        }
    }
}