8b0a0f9a8f
Motivation: We have different message aggregator implementations for different protocols, but they are very similar with each other. They all stems from HttpObjectAggregator. If we provide an abstract class that provide generic message aggregation functionality, we will remove their code duplication. Modifications: - Add MessageAggregator which provides generic message aggregation - Reimplement all existing aggregators using MessageAggregator - Add DecoderResultProvider interface and extend it wherever possible so that MessageAggregator respects the state of the decoded message Result: Less code duplication
81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.memcache;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.MessageAggregator;
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import io.netty.handler.codec.memcache.binary.BinaryMemcacheRequestDecoder;
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import io.netty.handler.codec.memcache.binary.BinaryMemcacheResponseEncoder;
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/**
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* A {@link ChannelHandler} that aggregates an {@link MemcacheMessage}
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* and its following {@link MemcacheContent}s into a single {@link MemcacheMessage} with
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* no following {@link MemcacheContent}s. It is useful when you don't want to take
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* care of memcache messages where the content comes along in chunks. Insert this
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* handler after a AbstractMemcacheObjectDecoder in the {@link ChannelPipeline}.
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* <p/>
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* For example, here for the binary protocol:
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* <p/>
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* <pre>
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* {@link ChannelPipeline} p = ...;
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* ...
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* p.addLast("decoder", new {@link BinaryMemcacheRequestDecoder}());
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* p.addLast("aggregator", <b>new {@link io.netty.handler.codec.memcache.binary.BinaryMemcacheObjectAggregator}(1048576)
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* </b>);
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* ...
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* p.addLast("encoder", new {@link BinaryMemcacheResponseEncoder}());
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* p.addLast("handler", new YourMemcacheRequestHandler());
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* </pre>
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*/
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public abstract class AbstractMemcacheObjectAggregator<H extends MemcacheMessage> extends
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MessageAggregator<MemcacheObject, H, MemcacheContent, FullMemcacheMessage> {
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protected AbstractMemcacheObjectAggregator(int maxContentLength) {
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super(maxContentLength);
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}
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@Override
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protected boolean isContentMessage(MemcacheObject msg) throws Exception {
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return msg instanceof MemcacheContent;
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}
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@Override
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protected boolean isLastContentMessage(MemcacheContent msg) throws Exception {
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return msg instanceof LastMemcacheContent;
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}
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@Override
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protected boolean isAggregated(MemcacheObject msg) throws Exception {
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return msg instanceof FullMemcacheMessage;
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}
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@Override
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protected boolean hasContentLength(H start) throws Exception {
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return false;
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}
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@Override
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protected long contentLength(H start) throws Exception {
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throw new UnsupportedOperationException();
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}
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@Override
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protected Object newContinueResponse(H start) throws Exception {
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return null;
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}
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}
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