alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (AbstractBinaryMemcacheEncoder.java)

This example Java source code file (AbstractBinaryMemcacheEncoder.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractbinarymemcacheencoder, abstractmemcacheobjectencoder, binarymemcachemessage, bytebuf, minimum_header_size, override, unstableapi

The AbstractBinaryMemcacheEncoder.java Java example source code

/*
 * Copyright 2013 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.codec.memcache.binary;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.handler.codec.memcache.AbstractMemcacheObjectEncoder;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.UnstableApi;

/**
 * A {@link MessageToByteEncoder} that encodes binary memcache messages into bytes.
 */
@UnstableApi
public abstract class AbstractBinaryMemcacheEncoder<M extends BinaryMemcacheMessage>
    extends AbstractMemcacheObjectEncoder<M> {

    /**
     * Every binary memcache message has at least a 24 bytes header.
     */
    private static final int MINIMUM_HEADER_SIZE = 24;

    @Override
    protected ByteBuf encodeMessage(ChannelHandlerContext ctx, M msg) {
        ByteBuf buf = ctx.alloc().buffer(MINIMUM_HEADER_SIZE + msg.extrasLength()
            + msg.keyLength());

        encodeHeader(buf, msg);
        encodeExtras(buf, msg.extras());
        encodeKey(buf, msg.key());

        return buf;
    }

    /**
     * Encode the extras.
     *
     * @param buf    the {@link ByteBuf} to write into.
     * @param extras the extras to encode.
     */
    private static void encodeExtras(ByteBuf buf, ByteBuf extras) {
        if (extras == null || !extras.isReadable()) {
            return;
        }

        buf.writeBytes(extras);
    }

    /**
     * Encode the key.
     *
     * @param buf the {@link ByteBuf} to write into.
     * @param key the key to encode.
     */
    private static void encodeKey(ByteBuf buf, ByteBuf key) {
        if (key == null || !key.isReadable()) {
            return;
        }

        buf.writeBytes(key);
    }

    /**
     * Encode the header.
     * <p/>
     * This methods needs to be implemented by a sub class because the header is different
     * for both requests and responses.
     *
     * @param buf the {@link ByteBuf} to write into.
     * @param msg the message to encode.
     */
    protected abstract void encodeHeader(ByteBuf buf, M msg);

}

Other Java examples (source code examples)

Here is a short list of links related to this Java AbstractBinaryMemcacheEncoder.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.