3a9f472161
Related: #4333 #4421 #5128 Motivation: slice(), duplicate() and readSlice() currently create a non-recyclable derived buffer instance. Under heavy load, an application that creates a lot of derived buffers can put the garbage collector under pressure. Modifications: - Add the following methods which creates a non-recyclable derived buffer - retainedSlice() - retainedDuplicate() - readRetainedSlice() - Add the new recyclable derived buffer implementations, which has its own reference count value - Add ByteBufHolder.retainedDuplicate() - Add ByteBufHolder.replace(ByteBuf) so that.. - a user can replace the content of the holder in a consistent way - copy/duplicate/retainedDuplicate() can delegate the holder construction to replace(ByteBuf) - Use retainedDuplicate() and retainedSlice() wherever possible - Miscellaneous: - Rename DuplicateByteBufTest to DuplicatedByteBufTest (missing 'D') - Make ReplayingDecoderByteBuf.reject() return an exception instead of throwing it so that its callers don't need to add dummy return statement Result: Derived buffers are now recycled when created via retainedSlice() and retainedDuplicate() and derived from a pooled buffer
232 lines
5.8 KiB
Java
232 lines
5.8 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* 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 distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.handler.codec.redis;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.DefaultByteBufHolder;
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import io.netty.buffer.Unpooled;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.UnstableApi;
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/**
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* An aggregated bulk string of <a href="http://redis.io/topics/protocol">RESP</a>.
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*/
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@UnstableApi
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public class FullBulkStringRedisMessage extends DefaultByteBufHolder implements LastBulkStringRedisContent {
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private FullBulkStringRedisMessage() {
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this(Unpooled.EMPTY_BUFFER);
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}
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/**
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* Creates a {@link FullBulkStringRedisMessage} for the given {@code content}.
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*
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* @param content the content, must not be {@code null}. If content is null or empty,
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* use {@link FullBulkStringRedisMessage#NULL_INSTANCE} or {@link FullBulkStringRedisMessage#EMPTY_INSTANCE}
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* instead of constructor.
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*/
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public FullBulkStringRedisMessage(ByteBuf content) {
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super(content);
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}
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/**
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* Returns whether the content of this message is {@code null}.
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*
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* @return indicates whether the content of this message is {@code null}.
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*/
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public boolean isNull() {
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return false;
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}
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@Override
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public String toString() {
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return new StringBuilder(StringUtil.simpleClassName(this))
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.append('[')
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.append("content=")
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.append(content())
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.append(']').toString();
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}
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/**
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* A predefined null instance of {@link FullBulkStringRedisMessage}.
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*/
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public static final FullBulkStringRedisMessage NULL_INSTANCE = new FullBulkStringRedisMessage() {
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@Override
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public boolean isNull() {
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return true;
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}
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@Override
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public ByteBuf content() {
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return Unpooled.EMPTY_BUFFER;
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}
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@Override
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public FullBulkStringRedisMessage copy() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage duplicate() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage retainedDuplicate() {
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return this;
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}
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@Override
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public int refCnt() {
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return 1;
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}
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@Override
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public FullBulkStringRedisMessage retain() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage retain(int increment) {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch(Object hint) {
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return this;
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}
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@Override
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public boolean release() {
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return false;
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}
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@Override
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public boolean release(int decrement) {
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return false;
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}
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};
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/**
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* A predefined empty instance of {@link FullBulkStringRedisMessage}.
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*/
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public static final FullBulkStringRedisMessage EMPTY_INSTANCE = new FullBulkStringRedisMessage() {
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@Override
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public ByteBuf content() {
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return Unpooled.EMPTY_BUFFER;
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}
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@Override
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public FullBulkStringRedisMessage copy() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage duplicate() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage retainedDuplicate() {
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return this;
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}
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@Override
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public int refCnt() {
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return 1;
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}
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@Override
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public FullBulkStringRedisMessage retain() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage retain(int increment) {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch() {
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch(Object hint) {
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return this;
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}
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@Override
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public boolean release() {
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return false;
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}
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@Override
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public boolean release(int decrement) {
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return false;
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}
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};
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@Override
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public FullBulkStringRedisMessage copy() {
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return (FullBulkStringRedisMessage) super.copy();
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}
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@Override
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public FullBulkStringRedisMessage duplicate() {
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return (FullBulkStringRedisMessage) super.duplicate();
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}
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@Override
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public FullBulkStringRedisMessage retainedDuplicate() {
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return (FullBulkStringRedisMessage) super.retainedDuplicate();
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}
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@Override
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public FullBulkStringRedisMessage replace(ByteBuf content) {
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return new FullBulkStringRedisMessage(content);
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}
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@Override
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public FullBulkStringRedisMessage retain() {
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super.retain();
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return this;
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}
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@Override
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public FullBulkStringRedisMessage retain(int increment) {
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super.retain(increment);
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch() {
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super.touch();
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return this;
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}
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@Override
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public FullBulkStringRedisMessage touch(Object hint) {
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super.touch(hint);
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return this;
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}
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}
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