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
120 lines
2.9 KiB
Java
120 lines
2.9 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,
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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.smtp;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.util.internal.UnstableApi;
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/**
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* The last part of a sequence of {@link SmtpContent}s that are sent after a {@code DATA} request.
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* Be aware that a {@link SmtpContent} / {@link LastSmtpContent} sequence must always use CRLF as line delimiter
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* and the lines that start with a DOT must be escaped with an extra DOT as
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* specified by <a href="https://www.ietf.org/rfc/rfc2821.txt">RFC2821</a>.
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*/
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@UnstableApi
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public interface LastSmtpContent extends SmtpContent {
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/**
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* Empty {@link LastSmtpContent}.
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*/
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LastSmtpContent EMPTY_LAST_CONTENT = new LastSmtpContent() {
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@Override
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public LastSmtpContent copy() {
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return this;
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}
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@Override
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public LastSmtpContent duplicate() {
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return this;
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}
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@Override
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public LastSmtpContent retainedDuplicate() {
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return this;
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}
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@Override
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public LastSmtpContent replace(ByteBuf content) {
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return new DefaultLastSmtpContent(content);
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}
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@Override
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public LastSmtpContent retain() {
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return this;
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}
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@Override
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public LastSmtpContent retain(int increment) {
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return this;
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}
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@Override
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public LastSmtpContent touch() {
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return this;
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}
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@Override
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public LastSmtpContent touch(Object hint) {
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return this;
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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 int refCnt() {
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return 1;
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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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LastSmtpContent copy();
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@Override
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LastSmtpContent duplicate();
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@Override
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LastSmtpContent retainedDuplicate();
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@Override
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LastSmtpContent replace(ByteBuf content);
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@Override
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LastSmtpContent retain();
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@Override
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LastSmtpContent retain(int increment);
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@Override
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LastSmtpContent touch();
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@Override
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LastSmtpContent touch(Object hint);
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}
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