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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS 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 2017 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:
 *
 *   https://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.channel;

import io.netty.util.internal.ObjectUtil;

abstract class PendingBytesTracker implements MessageSizeEstimator.Handle {
    private final MessageSizeEstimator.Handle estimatorHandle;

    private PendingBytesTracker(MessageSizeEstimator.Handle estimatorHandle) {
        this.estimatorHandle = ObjectUtil.checkNotNull(estimatorHandle, "estimatorHandle");
    }

    @Override
    public final int size(Object msg) {
        return estimatorHandle.size(msg);
    }

    public abstract void incrementPendingOutboundBytes(long bytes);
    public abstract void decrementPendingOutboundBytes(long bytes);

    static PendingBytesTracker newTracker(Channel channel) {
        if (channel.pipeline() instanceof DefaultChannelPipeline) {
            return new DefaultChannelPipelinePendingBytesTracker((DefaultChannelPipeline) channel.pipeline());
        } else {
            ChannelOutboundBuffer buffer = channel.unsafe().outboundBuffer();
            MessageSizeEstimator.Handle handle = channel.config().getMessageSizeEstimator().newHandle();
            // We need to guard against null as channel.unsafe().outboundBuffer() may returned null
            // if the channel was already closed when constructing the PendingBytesTracker.
            // See https://github.com/netty/netty/issues/3967
            return buffer == null ?
                    new NoopPendingBytesTracker(handle) : new ChannelOutboundBufferPendingBytesTracker(buffer, handle);
        }
    }

    private static final class DefaultChannelPipelinePendingBytesTracker extends PendingBytesTracker {
        private final DefaultChannelPipeline pipeline;

        DefaultChannelPipelinePendingBytesTracker(DefaultChannelPipeline pipeline) {
            super(pipeline.estimatorHandle());
            this.pipeline = pipeline;
        }

        @Override
        public void incrementPendingOutboundBytes(long bytes) {
            pipeline.incrementPendingOutboundBytes(bytes);
        }

        @Override
        public void decrementPendingOutboundBytes(long bytes) {
            pipeline.decrementPendingOutboundBytes(bytes);
        }
    }

    private static final class ChannelOutboundBufferPendingBytesTracker extends PendingBytesTracker {
        private final ChannelOutboundBuffer buffer;

        ChannelOutboundBufferPendingBytesTracker(
                ChannelOutboundBuffer buffer, MessageSizeEstimator.Handle estimatorHandle) {
            super(estimatorHandle);
            this.buffer = buffer;
        }

        @Override
        public void incrementPendingOutboundBytes(long bytes) {
            buffer.incrementPendingOutboundBytes(bytes);
        }

        @Override
        public void decrementPendingOutboundBytes(long bytes) {
            buffer.decrementPendingOutboundBytes(bytes);
        }
    }

    private static final class NoopPendingBytesTracker extends PendingBytesTracker {

        NoopPendingBytesTracker(MessageSizeEstimator.Handle estimatorHandle) {
            super(estimatorHandle);
        }

        @Override
        public void incrementPendingOutboundBytes(long bytes) {
            // Noop
        }

        @Override
        public void decrementPendingOutboundBytes(long bytes) {
            // Noop
        }
    }
}