df568c739e
Motivation: 1. Some encoders used a `ByteBuf#writeBytes` to write short constant byte array (2-3 bytes). This can be replaced with more faster `ByteBuf#writeShort` or `ByteBuf#writeMedium` which do not access the memory. 2. Two chained calls of the `ByteBuf#setByte` with constants can be replaced with one `ByteBuf#setShort` to reduce index checks. 3. The signature of method `HttpHeadersEncoder#encoderHeader` has an unnecessary `throws`. Modifications: 1. Use `ByteBuf#writeShort` or `ByteBuf#writeMedium` instead of `ByteBuf#writeBytes` for the constants. 2. Use `ByteBuf#setShort` instead of chained call of the `ByteBuf#setByte` with constants. 3. Remove an unnecessary `throws` from `HttpHeadersEncoder#encoderHeader`. Result: A bit faster writes constants into buffers.
113 lines
3.9 KiB
Java
113 lines
3.9 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.ByteBufUtil;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToMessageEncoder;
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import io.netty.util.internal.UnstableApi;
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import java.util.Iterator;
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import java.util.List;
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import java.util.RandomAccess;
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/**
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* Encoder for SMTP requests.
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*/
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@UnstableApi
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public final class SmtpRequestEncoder extends MessageToMessageEncoder<Object> {
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private static final int CRLF_SHORT = ('\r' << 8) | '\n';
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private static final byte SP = ' ';
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private static final ByteBuf DOT_CRLF_BUFFER = Unpooled.unreleasableBuffer(
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Unpooled.directBuffer(3).writeByte('.').writeByte('\r').writeByte('\n'));
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private boolean contentExpected;
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@Override
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public boolean acceptOutboundMessage(Object msg) throws Exception {
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return msg instanceof SmtpRequest || msg instanceof SmtpContent;
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
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if (msg instanceof SmtpRequest) {
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final SmtpRequest req = (SmtpRequest) msg;
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if (contentExpected) {
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if (req.command().equals(SmtpCommand.RSET)) {
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contentExpected = false;
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} else {
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throw new IllegalStateException("SmtpContent expected");
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}
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}
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boolean release = true;
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final ByteBuf buffer = ctx.alloc().buffer();
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try {
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req.command().encode(buffer);
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writeParameters(req.parameters(), buffer);
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ByteBufUtil.writeShortBE(buffer, CRLF_SHORT);
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out.add(buffer);
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release = false;
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if (req.command().isContentExpected()) {
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contentExpected = true;
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}
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} finally {
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if (release) {
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buffer.release();
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}
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}
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}
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if (msg instanceof SmtpContent) {
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if (!contentExpected) {
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throw new IllegalStateException("No SmtpContent expected");
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}
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final ByteBuf content = ((SmtpContent) msg).content();
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out.add(content.retain());
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if (msg instanceof LastSmtpContent) {
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out.add(DOT_CRLF_BUFFER.retainedDuplicate());
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contentExpected = false;
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}
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}
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}
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private static void writeParameters(List<CharSequence> parameters, ByteBuf out) {
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if (parameters.isEmpty()) {
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return;
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}
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out.writeByte(SP);
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if (parameters instanceof RandomAccess) {
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final int sizeMinusOne = parameters.size() - 1;
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for (int i = 0; i < sizeMinusOne; i++) {
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ByteBufUtil.writeAscii(out, parameters.get(i));
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out.writeByte(SP);
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}
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ByteBufUtil.writeAscii(out, parameters.get(sizeMinusOne));
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} else {
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final Iterator<CharSequence> params = parameters.iterator();
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for (;;) {
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ByteBufUtil.writeAscii(out, params.next());
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if (params.hasNext()) {
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out.writeByte(SP);
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} else {
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break;
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}
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}
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}
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}
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}
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