org.graylog2.inputs.transports.netty.PromiseFailureHandler.java Source code

Introduction

Here is the source code for org.graylog2.inputs.transports.netty.PromiseFailureHandler.java

Source

/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.graylog2.inputs.transports.netty;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Singleton;

@Singleton
@ChannelHandler.Sharable
public class PromiseFailureHandler extends ChannelOutboundHandlerAdapter {
    public static final PromiseFailureHandler INSTANCE = new PromiseFailureHandler();
    private static final Logger LOG = LoggerFactory.getLogger(PromiseFailureHandler.class);

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        promise.addListener(Listener.INSTANCE);
        super.write(ctx, msg, promise);
    }

    private static final class Listener implements ChannelFutureListener {
        private static final Listener INSTANCE = new Listener();

        @Override
        public void operationComplete(ChannelFuture future) throws Exception {
            if (!future.isSuccess()) {
                LOG.info("Write on channel {} failed", future.channel(), future.cause());
            }
        }
    }
}