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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.timeout;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;

import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

/**
 * Raises a {@link WriteTimeoutException} when no data was written within a
 * certain period of time.
 *
 *  * // The connection is closed when there is no outbound traffic
 * // for 30 seconds.
 *
 * public class MyChannelInitializer extends {@link ChannelInitializer}<{@link Channel}> {
 *     public void initChannel({@link Channel} channel) {
 *         channel.pipeline().addLast("writeTimeoutHandler", new {@link WriteTimeoutHandler}(30);
 *         channel.pipeline().addLast("myHandler", new MyHandler());
 *     }
 * }
 *
 * // Handler should handle the {@link WriteTimeoutException}.
 * public class MyHandler extends {@link ChannelDuplexHandler} {
 *     {@code @Override}
 *     public void exceptionCaught({@link ChannelHandlerContext} ctx, {@link Throwable} cause)
 *             throws {@link Exception} {
 *         if (cause instanceof {@link WriteTimeoutException}) {
 *             // do something
 *         } else {
 *             super.exceptionCaught(ctx, cause);
 *         }
 *     }
 * }
 *
 * {@link ServerBootstrap} bootstrap = ...;
 * ...
 * bootstrap.childHandler(new MyChannelInitializer());
 * ...
 * 
 * @see ReadTimeoutHandler
 * @see IdleStateHandler
 */
public class WriteTimeoutHandler extends ChannelOutboundHandlerAdapter {
    private static final long MIN_TIMEOUT_NANOS = TimeUnit.MILLISECONDS.toNanos(1);

    private final long timeoutNanos;

    private boolean closed;

    /**
     * Creates a new instance.
     *
     * @param timeoutSeconds
     *        write timeout in seconds
     */
    public WriteTimeoutHandler(int timeoutSeconds) {
        this(timeoutSeconds, TimeUnit.SECONDS);
    }

    /**
     * Creates a new instance.
     *
     * @param timeout
     *        write timeout
     * @param unit
     *        the {@link TimeUnit} of {@code timeout}
     */
    public WriteTimeoutHandler(long timeout, TimeUnit unit) {
        if (unit == null) {
            throw new NullPointerException("unit");
        }

        if (timeout <= 0) {
            timeoutNanos = 0;
        } else {
            timeoutNanos = Math.max(unit.toNanos(timeout), MIN_TIMEOUT_NANOS);
        }
    }

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

    private void scheduleTimeout(final ChannelHandlerContext ctx, final ChannelPromise future) {
        if (timeoutNanos > 0) {
            // Schedule a timeout.
            final ScheduledFuture sf = ctx.executor().schedule(new Runnable() {
                @Override
                public void run() {
                    // Was not written yet so issue a write timeout
                    // The future itself will be failed with a ClosedChannelException once the close() was issued
                    // See https://github.com/netty/netty/issues/2159
                    if (!future.isDone()) {
                        try {
                            writeTimedOut(ctx);
                        } catch (Throwable t) {
                            ctx.fireExceptionCaught(t);
                        }
                    }
                }
            }, timeoutNanos, TimeUnit.NANOSECONDS);

            // Cancel the scheduled timeout if the flush future is complete.
            future.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    sf.cancel(false);
                }
            });
        }
    }

    /**
     * Is called when a write timeout was detected
     */
    protected void writeTimedOut(ChannelHandlerContext ctx) throws Exception {
        if (!closed) {
            ctx.fireExceptionCaught(WriteTimeoutException.INSTANCE);
            ctx.close();
            closed = true;
        }
    }
}