TimeoutHandler.java

/*
 * Copyright (C) 2012-2016 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.nifty.client;

import org.jboss.netty.channel.ChannelDownstreamHandler;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import org.jboss.netty.channel.MessageEvent;

import static com.google.common.base.Preconditions.checkNotNull;

public final class TimeoutHandler implements ChannelUpstreamHandler, ChannelDownstreamHandler
{
    private static final String NAME = "_TIMEOUT_HANDLER";

    private volatile long lastMessageReceivedNanos = 0L;
    private volatile long  lastMessageSentNanos = 0L;

    public static synchronized void addToPipeline(ChannelPipeline cp)
    {
        checkNotNull(cp, "cp is null");
        if (cp.get(NAME) == null) {
            cp.addFirst(NAME, new TimeoutHandler());
        }
    }

    public static TimeoutHandler findTimeoutHandler(ChannelPipeline cp)
    {
        return (TimeoutHandler) cp.get(NAME);
    }

    private TimeoutHandler()
    {
    }

    @Override
    public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
        throws Exception
    {
        if (e instanceof MessageEvent) {
            lastMessageReceivedNanos = System.nanoTime();
        }
        ctx.sendUpstream(e);
    }

    @Override
    public void handleDownstream(ChannelHandlerContext ctx, ChannelEvent e)
        throws Exception
    {
        if (e instanceof MessageEvent) {
            lastMessageSentNanos = System.nanoTime();
        }
        ctx.sendDownstream(e);
    }

    public long getLastMessageReceivedNanos()
    {
        return lastMessageReceivedNanos;
    }

    public long getLastMessageSentNanos()
    {
        return lastMessageSentNanos;
    }
}